Adhesive Friction Law - Revision history

Nairnj: /* Properties */

2026-03-26T18:23:05Z

Properties

← Older revision		Revision as of 18:23, 26 March 2026
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	\| vhalf \|\| Velocity where transition from µ<sub>s</sub> to µ<sub>d</sub> is half done \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|(velocity units)]] \|\| 0		\| vhalf \|\| Velocity where transition from µ<sub>s</sub> to µ<sub>d</sub> is half done \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|(velocity units)]] \|\| 0
	\|-		\|-
	\| displacementOnly \|\| Set to: 0 to detect contact when COD<0 <i>and</i> stress<0; 1 to detect contact whenever COD<0 regardless of stress; <0 to detect contact when COD<0 <i>and</i> stress<<tt>-displacementOnly<~~/tt~~> ~~(in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0~~		\| displacementOnly<br>Dc \|\| These properties implemented some alternative methods for detecting contact. They are no longer implemented. If an old file enters values, the output for that contact law will explain the feature is "no longer used." \|\| none \|\| none
	\|-
	\| Dc \|\| ~~<0 to find separation assuming perfect interfaciall~~ contact, ~~≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation~~. \|\| ~~[[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]]~~ \|\| none
	\|}		\|}

	See [[Coulomb Friction Law#Comments on Parameters\|some comments]] about the <tt>displacementOnly</tt> and </tt>Dc</tt> parameters.		See [[Coulomb Friction Law#Comments on Parameters\|some comments]] about the <tt>displacementOnly</tt> and </tt>Dc</tt> parameters.

Nairnj: /* Description */

2025-11-11T20:20:23Z

Description

← Older revision		Revision as of 20:20, 11 November 2025
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	where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 implying zero adhesive strength. With zero adhesive strength, surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.		where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 implying zero adhesive strength. With zero adhesive strength, surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.

	Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is ~~slightly~~ more efficient ~~(although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>)~~.		Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is more efficient.

	== Properties ==		== Properties ==

Nairnj: /* Description */

2025-11-11T20:18:55Z

Description

← Older revision		Revision as of 20:18, 11 November 2025
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	<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>		<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>

	where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 implying zero adhesive strength. ~~Surfaces~~ not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.		where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 implying zero adhesive strength. With zero adhesive strength, surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.

	Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).		Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).

Nairnj: /* Description */

2025-11-11T20:18:02Z

Description

← Older revision		Revision as of 20:18, 11 November 2025
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	<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>		<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>

	where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 ~~mean~~ zero adhesive strength. Surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.		where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 implying zero adhesive strength. Surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.

	Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).		Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).

Nairnj: /* Description */

2025-11-11T20:17:42Z

Description

← Older revision		Revision as of 20:17, 11 November 2025
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	<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>		<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>

	where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always %gt; 1 mean zero adhesive strength. Surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.		where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always > 1 mean zero adhesive strength. Surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.

	Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).		Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).

Nairnj: /* Description */

2025-11-11T20:16:58Z

Description

← Older revision		Revision as of 20:16, 11 November 2025
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	<math>S_{slide} = \left({\mu_s v_{1/2} + \mu_d \Delta v\over v_{1/2}+\Delta v} + k \Delta v\right) N + S_a \quad{\rm if}\quad S_{stick}> \mu_s N+S_a</math>		<math>S_{slide} = \left({\mu_s v_{1/2} + \mu_d \Delta v\over v_{1/2}+\Delta v} + k \Delta v\right) N + S_a \quad{\rm if}\quad S_{stick}> \mu_s N+S_a</math>

	and µ<sub>s</sub> and µ<sub>d</sub> are the static and dynamic coefficients of friction, v<sub>1/2</sub> allows a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>, ''k'' allows friction coefficient to depend linearly on sliding velocity (Δv), and S<sub>a</sub> is a shear adhesion strength. In other words, the sliding will begin when it overcomes the static friction plus adhesion force, but thereafter will slide with a velocity-dependent dynamic coefficient of friction plus an adhesion term.		and µ<sub>s</sub> and µ<sub>d</sub> are the static and dynamic coefficients of friction, v<sub>1/2</sub> allows a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>, ''k'' allows friction coefficient to depend linearly on sliding velocity (Δv), and ''S<sub>a</sub>'' is a shear adhesion strength. In other words, the sliding will begin when it overcomes the static friction plus adhesion force, but thereafter will slide with a velocity-dependent dynamic coefficient of friction plus an adhesion term.

	Simulations show the dynamic fluctuations can result in simulations that are barely affected by static coefficient of friction. The problem is resolving the instantaneous drop in coefficient of friction at the onset of sliding. One way to simulate real static/dynamic effects is to implement a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>. The leading term in the above law achieves this goal by monotonically transitioning from µ<sub>s</sub> when Δv = 0 to µ<sub>d</sub> for high Δv. The law parameter v<sub>1/2</sub> is the velocity at which that term is half way from µ<sub>s</sub> to µ<sub>d</sub>. The default value of v<sub>1/2</sub> = 0 models an instantaneous change in friction coefficient. Choosing the appropriate value for v<sub>1/2</sub> for a given problem may require experimentation.		Simulations show the dynamic fluctuations can result in simulations that are barely affected by static coefficient of friction. The problem is resolving the instantaneous drop in coefficient of friction at the onset of sliding. One way to simulate real static/dynamic effects is to implement a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>. The leading term in the above law achieves this goal by monotonically transitioning from µ<sub>s</sub> when Δv = 0 to µ<sub>d</sub> for high Δv. The law parameter v<sub>1/2</sub> is the velocity at which that term is half way from µ<sub>s</sub> to µ<sub>d</sub>. The default value of v<sub>1/2</sub> = 0 models an instantaneous change in friction coefficient. Choosing the appropriate value for v<sub>1/2</sub> for a given problem may require experimentation.

Nairnj: /* Description */

2025-11-11T20:16:33Z

Description

← Older revision		Revision as of 20:16, 11 November 2025
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	<math>S_{slide} = \left({\mu_s v_{1/2} + \mu_d \Delta v\over v_{1/2}+\Delta v} + k \Delta v\right) N + S_a \quad{\rm if}\quad S_{stick}> \mu_s N+S_a</math>		<math>S_{slide} = \left({\mu_s v_{1/2} + \mu_d \Delta v\over v_{1/2}+\Delta v} + k \Delta v\right) N + S_a \quad{\rm if}\quad S_{stick}> \mu_s N+S_a</math>

	and µ<sub>s</sub> and µ<sub>d</sub> are the static and dynamic coefficients of friction, v<sub>1/2</sub> allows a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>, '''k''' allows friction coefficient to depend linearly on sliding velocity (Δv), and S<sub>a</sub> is a shear adhesion strength. In other words, the sliding will begin when it overcomes the static friction plus adhesion force, but thereafter will slide with a velocity-dependent dynamic coefficient of friction plus an adhesion term.		and µ<sub>s</sub> and µ<sub>d</sub> are the static and dynamic coefficients of friction, v<sub>1/2</sub> allows a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>, ''k'' allows friction coefficient to depend linearly on sliding velocity (Δv), and S<sub>a</sub> is a shear adhesion strength. In other words, the sliding will begin when it overcomes the static friction plus adhesion force, but thereafter will slide with a velocity-dependent dynamic coefficient of friction plus an adhesion term.

	Simulations show the dynamic fluctuations can result in simulations that are barely affected by static coefficient of friction. The problem is resolving the instantaneous drop in coefficient of friction at the onset of sliding. One way to simulate real static/dynamic effects is to implement a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>. The leading term in the above law achieves this goal by monotonically transitioning from µ<sub>s</sub> when Δv = 0 to µ<sub>d</sub> for high Δv. The law parameter v<sub>1/2</sub> is the velocity at which that term is half way from µ<sub>s</sub> to µ<sub>d</sub>. The default value of v<sub>1/2</sub> = 0 models an instantaneous change in friction coefficient. Choosing the appropriate value for v<sub>1/2</sub> for a given problem may require experimentation.		Simulations show the dynamic fluctuations can result in simulations that are barely affected by static coefficient of friction. The problem is resolving the instantaneous drop in coefficient of friction at the onset of sliding. One way to simulate real static/dynamic effects is to implement a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>. The leading term in the above law achieves this goal by monotonically transitioning from µ<sub>s</sub> when Δv = 0 to µ<sub>d</sub> for high Δv. The law parameter v<sub>1/2</sub> is the velocity at which that term is half way from µ<sub>s</sub> to µ<sub>d</sub>. The default value of v<sub>1/2</sub> = 0 models an instantaneous change in friction coefficient. Choosing the appropriate value for v<sub>1/2</sub> for a given problem may require experimentation.

Nairnj: /* Description */

2025-11-11T20:16:18Z

Description

← Older revision		Revision as of 20:16, 11 November 2025
Line 7:		Line 7:
	<math>S_{slide} = \left({\mu_s v_{1/2} + \mu_d \Delta v\over v_{1/2}+\Delta v} + k \Delta v\right) N + S_a \quad{\rm if}\quad S_{stick}> \mu_s N+S_a</math>		<math>S_{slide} = \left({\mu_s v_{1/2} + \mu_d \Delta v\over v_{1/2}+\Delta v} + k \Delta v\right) N + S_a \quad{\rm if}\quad S_{stick}> \mu_s N+S_a</math>

	and µ<sub>s</sub> and µ<sub>d</sub> are the static and dynamic coefficients of friction, v<sub>1/2</sub> allows a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>, k allows friction coefficient to depend linearly on sliding velocity (Δv), and S<sub>a</sub> is a shear adhesion strength. In other words, the sliding will begin when it overcomes the static friction plus adhesion force, but thereafter will slide with a velocity-dependent dynamic coefficient of friction plus an adhesion term.		and µ<sub>s</sub> and µ<sub>d</sub> are the static and dynamic coefficients of friction, v<sub>1/2</sub> allows a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>, '''k''' allows friction coefficient to depend linearly on sliding velocity (Δv), and S<sub>a</sub> is a shear adhesion strength. In other words, the sliding will begin when it overcomes the static friction plus adhesion force, but thereafter will slide with a velocity-dependent dynamic coefficient of friction plus an adhesion term.

	Simulations show the dynamic fluctuations can result in simulations that are barely affected by static coefficient of friction. The problem is resolving the instantaneous drop in coefficient of friction at the onset of sliding. One way to simulate real static/dynamic effects is to implement a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>. The leading term in the above law achieves this goal by monotonically transitioning from µ<sub>s</sub> when Δv = 0 to µ<sub>d</sub> for high Δv. The law parameter v<sub>1/2</sub> is the velocity at which that term is half way from µ<sub>s</sub> to µ<sub>d</sub>. The default value of v<sub>1/2</sub> = 0 models an instantaneous change in friction coefficient. Choosing the appropriate value for v<sub>1/2</sub> for a given problem may require experimentation.		Simulations show the dynamic fluctuations can result in simulations that are barely affected by static coefficient of friction. The problem is resolving the instantaneous drop in coefficient of friction at the onset of sliding. One way to simulate real static/dynamic effects is to implement a smooth transition from µ<sub>s</sub> to µ<sub>d</sub>. The leading term in the above law achieves this goal by monotonically transitioning from µ<sub>s</sub> when Δv = 0 to µ<sub>d</sub> for high Δv. The law parameter v<sub>1/2</sub> is the velocity at which that term is half way from µ<sub>s</sub> to µ<sub>d</sub>. The default value of v<sub>1/2</sub> = 0 models an instantaneous change in friction coefficient. Choosing the appropriate value for v<sub>1/2</sub> for a given problem may require experimentation.

	If the surfaces are not in contact, the ~~surface~~ continue to stick as long as:		If the surfaces are not in contact, the surfaces continue to stick as long as:


	<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>		<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>

	where N<sub>a</sub> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the ~~surfaces~~ will ~~have no separation adhesion and therefore~~ always move freely ~~when not in contact~~. This approach extends [[Coulomb Friction]] ~~contact loaw~~ to allow smooth transition from static to ~~dynamice~~ coefficient of friction and to allow velocity dependent coefficient of friction.		where <i>N<sub>a</sub></i> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the above check is always %gt; 1 mean zero adhesive strength. Surfaces not in contact will always move freely. This approach extends the [[Coulomb Friction Law]] to allow smooth transition from static to dynamic coefficient of friction and to allow velocity-dependent coefficient of friction.

	Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).		Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).

Nairnj: /* Description */

2025-11-11T20:12:45Z

Description

← Older revision		Revision as of 20:12, 11 November 2025
Line 16:		Line 16:
	<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>		<math>\left({S_{stick}\over S_a}\right)^2 + \left({N\over N_a}\right)^2 < 1</math>

	where N<sub>a</sub> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either Sa or Na are zero, the surfaces will have no separation adhesion and therefore always move freely when not in contact.		where N<sub>a</sub> is the normal adhesion strength. If this criterion is not met, the surfaces move apart freely with zero tractions. If either <i>S<sub>a</sub></i> or <i>N<sub>a</sub></i> are zero, the surfaces will have no separation adhesion and therefore always move freely when not in contact. This approach extends [[Coulomb Friction]] contact loaw to allow smooth transition from static to dynamice coefficient of friction and to allow velocity dependent coefficient of friction.

	Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).		Note that the adhesion in this law is reversible. In other words, if the stresses break the adhesion as moving apart, they will stick with the same adhesive strengths when the surfaces come back into contact. Also note that the simple [[Coulomb Friction Law\|Coulomb friction]] contact law is a special case of this law for Sa = 0, k = 0, and v<sub>1/2</sub> = 0. If all these properties are zero, the simpler law is slightly more efficient (although the [[Coulomb Friction Law\|simpler law]] cannot model a smooth transition µ<sub>s</sub> to µ<sub>d</sub>).

Nairnj at 19:58, 18 September 2020

2020-09-18T19:58:50Z

← Older revision		Revision as of 19:58, 18 September 2020
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	\| vhalf \|\| Velocity where transition from µ<sub>s</sub> to µ<sub>d</sub> is half done \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|(velocity units)]] \|\| 0		\| vhalf \|\| Velocity where transition from µ<sub>s</sub> to µ<sub>d</sub> is half done \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|(velocity units)]] \|\| 0
	\|-		\|-
	\| displacementOnly \|\| Set to: 0 to detect contact when COD<0 <i>and</i> stress<0; 1 to detect contact whenever COD<0 ~~and~~ stress ~~is ignored~~; <0 to detect contact when COD<0 <i>and</i> stress<<tt>-displacementOnly</tt> (in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0		\| displacementOnly \|\| Set to: 0 to detect contact when COD<0 <i>and</i> stress<0; 1 to detect contact whenever COD<0 regardless of stress; <0 to detect contact when COD<0 <i>and</i> stress<<tt>-displacementOnly</tt> (in [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]])\|\| none \|\| 0
	\|-		\|-
	\| Dc \|\| <0 to find separation assuming perfect interfaciall contact, ≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation. \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]] \|\| none		\| Dc \|\| <0 to find separation assuming perfect interfaciall contact, ≥0 to use [[Linear Imperfect Interface\|imperfect interface methods]] to find separation. \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure/length units]] \|\| none