Orthotropic Plastic Softening Material - Revision history

Nairnj: /* History Variables */

2026-03-29T17:40:52Z

History Variables

← Older revision		Revision as of 17:40, 29 March 2026
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	If you also [[MPM Archiving Options\|archive the <tt>damagenormal</tt>]], you will be able to plot a vector along the crack-opening displacement vector in the crack axis system.		If you also [[MPM Archiving Options\|archive the <tt>damagenormal</tt>]], you will be able to plot a vector along the crack-opening displacement vector in the crack axis system.

			== References ==

			<references>

			<ref name="dmGen">J. A. Nairn, "Generalization of Anisotropic Damage Mechanics Modeling in the Material Point Method," ''Int. J. for Numerical Methods in Engineering'', '''123''', 5072-5097 (2022). ([https://www.cof.orst.edu/cof/wse/faculty/Nairn/papers/GenDamage.pdf See PDF])</ref>

			</references>

Nairnj: /* Constitutive Law */

2026-03-29T17:40:40Z

Constitutive Law

← Older revision		Revision as of 17:40, 29 March 2026
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	== Constitutive Law ==		== Constitutive Law ==

	This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage.<ref name-"dmGen"/> In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.		This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage.<ref name="dmGen"/> In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.

	== Material Properties ==		== Material Properties ==

Nairnj: /* Constitutive Law */

2026-03-29T17:40:29Z

Constitutive Law

← Older revision		Revision as of 17:40, 29 March 2026
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	== Constitutive Law ==		== Constitutive Law ==

	This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.		This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage.<ref name-"dmGen"/> In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.

	== Material Properties ==		== Material Properties ==

Nairnj at 02:35, 18 April 2024

2024-04-18T02:35:11Z

← Older revision		Revision as of 02:35, 18 April 2024
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	== Constitutive Law ==		== Constitutive Law ==

	~~(This material is available only in [[OSParticulas]] because it is still in development)~~

	This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.		This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.

Nairnj: /* Constitutive Law */

2023-11-18T17:49:17Z

Constitutive Law

← Older revision		Revision as of 17:49, 18 November 2023
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	(This material is available only in [[OSParticulas]] because it is still in development)		(This material is available only in [[OSParticulas]] because it is still in development)

	This [[Material Models\|MPM ~~Material~~]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.		This [[Material Models#Softening Materials\|MPM softening material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.

	== Material Properties ==		== Material Properties ==

Nairnj: /* History Variables */

2023-09-21T21:19:22Z

History Variables

← Older revision		Revision as of 21:19, 21 September 2023
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	* 1: Plastic law history variable		* 1: Plastic law history variable
	* 2 to 1+S: [[Orthotropic Softening Material]] history ~~variables~~		* 2 to 1+S: [[Orthotropic Softening Material]] history variable <tt>S</tt>
	* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system		* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system
	* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system		* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system

Nairnj: /* History Variables */

2023-09-21T21:18:30Z

History Variables

← Older revision		Revision as of 21:18, 21 September 2023
Line 30:		Line 30:
	* 1: Plastic law history variable		* 1: Plastic law history variable
	* 2 to 1+S: [[Orthotropic Softening Material]] history variables		* 2 to 1+S: [[Orthotropic Softening Material]] history variables
	** 11: In 2D has total dissipated energy by damage mechanics (in [[ConsistentUnits Command#Legacy and Consistent Units\|energy units]])
	* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system		* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system
	* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system		* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system

Nairnj: /* History Variables */

2023-09-15T06:57:29Z

History Variables

← Older revision		Revision as of 06:57, 15 September 2023
Line 30:		Line 30:
	* 1: Plastic law history variable		* 1: Plastic law history variable
	* 2 to 1+S: [[Orthotropic Softening Material]] history variables		* 2 to 1+S: [[Orthotropic Softening Material]] history variables
	** 11: In 2D has total dissipated energy by damage mechanics (in [[ConsistentUnits Command#Legacy and Consistent Units\|~~Energy~~ units]])		** 11: In 2D has total dissipated energy by damage mechanics (in [[ConsistentUnits Command#Legacy and Consistent Units\|energy units]])
	* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system		* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system
	* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system		* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system

Nairnj: /* History Variables */

2023-09-15T06:54:21Z

History Variables

← Older revision		Revision as of 06:54, 15 September 2023
Line 28:		Line 28:
	Let S be number of history variables for damage needed by an [[Orthotropic Softening Material]], respectively. The history variables for this material are then:		Let S be number of history variables for damage needed by an [[Orthotropic Softening Material]], respectively. The history variables for this material are then:

	* 1: Plastic law history ~~variables~~		* 1: Plastic law history variable
	* 2 to 1+S: [[Orthotropic Softening Material]] history variables		* 2 to 1+S: [[Orthotropic Softening Material]] history variables
			** 11: In 2D has total dissipated energy by damage mechanics (in [[ConsistentUnits Command#Legacy and Consistent Units\|Energy units]])
	* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system		* 2+S: ε<sub>c,xx</sub> or x direction cracking strain normal to crack in the crack axis system
	* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system		* 3+S: γ<sub>c,xy</sub> or x-y direction shear cracking strain in the crack axis system

Nairnj: /* Constitutive Law */

2020-12-29T21:55:14Z

Constitutive Law

← Older revision		Revision as of 21:55, 29 December 2020
Line 1:		Line 1:
	== Constitutive Law ==		== Constitutive Law ==

	This ~~[[Material Models\|MPM Material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. The~~ material is available only in [[OSParticulas]].		(This material is available only in [[OSParticulas]] because it is still in development)

	In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening ~~allowing~~ stresses to reach stress for initiation of damage.		This [[Material Models\|MPM Material]] is an orthotropic, elastic-plastic material that can also develop anisotropic damage. In the absence of damage, this material is identical to a [[Anisotropic, Elastic-Plastic Material]]. In the absence of plasticity, this material is identical to an [[Orthotropic Softening Material]]. If conditions allow, the material can develop both plasticity and damage with softening. Note that if plastic yield properties are below damage initiation stress, the material may never reach stress to cause damage. But, if the plastic properties allow hardening, the material can yield first and then start damage after hardening allows stresses to reach stress for initiation of damage.

	== Material Properties ==		== Material Properties ==