Transversely Isotropic Failure Surface - Revision history

Nairnj: /* Introduction */

2023-01-31T04:16:26Z

Introduction

← Older revision		Revision as of 04:16, 31 January 2023
Line 2:		Line 2:
	== Introduction ==		== Introduction ==

	This [[Damage Initiation Laws\|damage initiation law]] predicts failure in transversely isotropic materials. Because it deals with a specific material type, this law is only appropriate for [[Transversely Isotropic Softening Material\|TransIsoSoftening ~~1 and 2~~]] materials.		This [[Damage Initiation Laws\|damage initiation law]] predicts failure in transversely isotropic materials. Because it deals with a specific material type, this law is only appropriate for [[Transversely Isotropic Softening Material\|TransIsoSoftening]] materials.

	== Failure Surface ==		== Failure Surface ==

Nairnj: /* Damage Law Properties */

2020-02-21T06:12:34Z

Damage Law Properties

← Older revision		Revision as of 06:12, 21 February 2020
Line 29:		Line 29:
	\|}		\|}

	Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Crack that form by shear are determined by minimum of taucA and taucT. Even though the maximum value is never used to initiate failure, it is still needed for damage evolution. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction. But, if the wood initiates failure by tension parallel ~~tot he~~ fibers and then is loaded in shear, the shear damage evolution will be determined by softening law based on <tt>tauT</tt>.		Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Crack that form by shear are determined by minimum of taucA and taucT. Even though the maximum value is never used to initiate failure, it is still needed for damage evolution. For example, in wood, <tt>taucA</tt> is called "shear parallel strength," <tt>tauT</tt> is called "shear perpendicular strength," and <tt>tauc</tt> is called "rolling shear strength." For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction. But, if the wood initiates failure by tension parallel to the fibers and then is loaded in shear, the shear damage evolution will be determined by softening law based on <tt>tauT</tt>.

Nairnj: /* Damage Law Properties */

2020-02-21T06:11:38Z

Damage Law Properties

← Older revision		Revision as of 06:11, 21 February 2020
Line 29:		Line 29:
	\|}		\|}

	Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). ~~If failure occurs~~ by shear ~~in a plane parallel to the axial direction, the failure and crack orientation will be~~ determined by ~~the~~ minimum of taucA and taucT. Even though the maximum value is never used to initiate failure, it is still needed for damage evolution. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction. But, if the wood initiates failure by tension parallel tot he fibers and then is loaded in shear, the shear damage evolution will be determined by softening law based on <tt>tauT</tt>.		Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Crack that form by shear are determined by minimum of taucA and taucT. Even though the maximum value is never used to initiate failure, it is still needed for damage evolution. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction. But, if the wood initiates failure by tension parallel tot he fibers and then is loaded in shear, the shear damage evolution will be determined by softening law based on <tt>tauT</tt>.

Nairnj: /* Damage Law Properties */

2020-02-20T22:15:16Z

Damage Law Properties

← Older revision		Revision as of 22:15, 20 February 2020
Line 29:		Line 29:
	\|}		\|}

	Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). ~~Axial~~ shear failure will ~~always occur at~~ the minimum of ~~these two values~~. ~~Two properties are provided~~ to ~~facilitate comparison to material characterization~~. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction.		Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). If failure occurs by shear in a plane parallel to the axial direction, the failure and crack orientation will be determined by the minimum of taucA and taucT. Even though the maximum value is never used to initiate failure, it is still needed for damage evolution. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction. But, if the wood initiates failure by tension parallel tot he fibers and then is loaded in shear, the shear damage evolution will be determined by softening law based on <tt>tauT</tt>.

Nairnj: /* Failure Surface */

2020-02-20T21:48:39Z

Failure Surface

← Older revision		Revision as of 21:48, 20 February 2020
Line 8:		Line 8:
	This failure surface has five failure properties. First, are two tensile strengths <math>\sigma_A</math> and <math>\sigma_T</math>. The first tensile strength is for tensile loading in the axial direction. The second is for tensile failure in the isotropic plane, which occurs in the maximum normal stress direction in that plane.		This failure surface has five failure properties. First, are two tensile strengths <math>\sigma_A</math> and <math>\sigma_T</math>. The first tensile strength is for tensile loading in the axial direction. The second is for tensile failure in the isotropic plane, which occurs in the maximum normal stress direction in that plane.

	Second, are three shear strengths <math>\tau_A</math>, <math>\tau_T</math>, and <math>\tau_{RS}</math>. The first two shear strength are for failure at maximum shear stress in planes parallel to the axial direction. When failure occurs in such a plane, the resulting crack will either be parallel to the axial direction (if <math>\tau_A < \tau_T</math>) or ~~through~~ the axial direction (if <math>\tau_T< \tau_A</math>) . The last shear strength is for failure in the isotropic plane, which occurs in the maximum shear stress direction in that plane.		Second, are three shear strengths <math>\tau_A</math>, <math>\tau_T</math>, and <math>\tau_{RS}</math>. The first two shear strength are for failure at maximum shear stress in planes parallel to the axial direction. When failure occurs in such a plane, the resulting crack will either be parallel to the axial direction with normal in transverse direction (if <math>\tau_A < \tau_T</math>) or parallel to the transverse direction with normal in the axial direction (if <math>\tau_T< \tau_A</math>) . The last shear strength is for failure in the isotropic plane, which occurs in the maximum shear stress direction in that plane.

	== Damage Law Properties ==		== Damage Law Properties ==

Nairnj: /* Damage Law Properties */

2017-04-29T19:42:28Z

Damage Law Properties

← Older revision		Revision as of 19:42, 29 April 2017
Line 29:		Line 29:
	\|}		\|}

	Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Axial shear failure will always occur at the minimum of these two values. Two properties are provided to facilitate comparison to material characterization. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers.		Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Axial shear failure will always occur at the minimum of these two values. Two properties are provided to facilitate comparison to material characterization. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers in the axial direction.

Nairnj: /* Damage Law Properties */

2017-04-29T19:42:06Z

Damage Law Properties

← Older revision		Revision as of 19:42, 29 April 2017
Line 29:		Line 29:
	\|}		\|}

	Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Axial shear failure will always occur at the minimum of these two values. Two properties are provided to facilitate comparison to material characterization. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is ~~must large~~ than <tt>taucA</tt>, which failure is by shear cracks parallel to the wood fibers.		Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Axial shear failure will always occur at the minimum of these two values. Two properties are provided to facilitate comparison to material characterization. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is much larger than <tt>taucA</tt>, which means shear failure is by shear cracks parallel to the wood fibers.

Nairnj: /* Damage Law Properties */

2017-04-29T19:41:09Z

Damage Law Properties

← Older revision		Revision as of 19:41, 29 April 2017
Line 28:		Line 28:
	\| tauc \|\|Critical transverse shear stress for shear failure n the isotropic plane (output as <tt>taucRS</tt>) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite		\| tauc \|\|Critical transverse shear stress for shear failure n the isotropic plane (output as <tt>taucRS</tt>) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
	\|}		\|}

			Notice this law has two axial shear strengths (<tt>taucA</tt> and <tt>taucT</tt>). Axial shear failure will always occur at the minimum of these two values. Two properties are provided to facilitate comparison to material characterization. For example, in wood, <tt>taucA</tt> is called "shear parallel strength", <tt>tauT</tt> is called "shear perpendicular strength", and <tt>tauc</tt> is called "rolling shear strength". For wood, <tt>tauT</tt> is must large than <tt>taucA</tt>, which failure is by shear cracks parallel to the wood fibers.

Nairnj: /* Introduction */

2017-01-19T05:24:31Z

Introduction

← Older revision		Revision as of 05:24, 19 January 2017
Line 2:		Line 2:
	== Introduction ==		== Introduction ==

	This [[Damage Initiation Laws\|damage initiation law]] predicts failure in transversely isotropic materials. Because it deals with a specific material type, this law is only appropriate for [[Transversely Isotropic Softening Material\|~~TransIsoSoftening1~~ and 2]] materials.		This [[Damage Initiation Laws\|damage initiation law]] predicts failure in transversely isotropic materials. Because it deals with a specific material type, this law is only appropriate for [[Transversely Isotropic Softening Material\|TransIsoSoftening 1 and 2]] materials.

	== Failure Surface ==		== Failure Surface ==

Nairnj: /* Damage Law Properties */

2017-01-10T08:21:41Z

Damage Law Properties

← Older revision		Revision as of 08:21, 10 January 2017
Line 18:		Line 18:
	! Property !! Description !! Units !! Default		! Property !! Description !! Units !! Default
	\|-		\|-
	\| sigmacA \|\| Critical stress for failure in the axial direction (output as <tt>sigcA<tt>) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite		\| sigmacA \|\| Critical stress for failure in the axial direction (output as <tt>sigcA</tt>) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
			\|-
			\| sigmac \|\|Critical transverse tensile strength for tensile failure in the isotropic plane (output as <tt>sigcT</tt>) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
	\|-		\|-
	\| taucA \|\| Critical shear stress for failure due to axial shear stress with failure parallel to the axial direction \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite		\| taucA \|\| Critical shear stress for failure due to axial shear stress with failure parallel to the axial direction \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
Line 24:		Line 26:
	\| taucT \|\| Critical shear stress for failure due to axial shear stress with failure through the axial direction \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite		\| taucT \|\| Critical shear stress for failure due to axial shear stress with failure through the axial direction \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
	\|-		\|-
	~~\| sigmac \|\|Critical transverse tensile strength for tensile failure in the isotropic plane (output as sigmacT) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite~~		\| tauc \|\|Critical transverse shear stress for shear failure n the isotropic plane (output as <tt>taucRS</tt>) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
	\|-
	\| tauc \|\|Critical transverse shear stress for shear failure n the isotropic plane (output as taucRS) \|\| [[ConsistentUnits Command#Legacy and Consistent Units\|pressure units]] \|\| infinite
	\|}		\|}