Laminate failure analysis nomenclature

Ply stress and strain limits are defined based on the ply coordinate system. These limits are defined in the material dialog boxes.

Symbol	Description	Name of the material property in Pre/Post	Comment
Isotropic	Orthotropic	Fiber-reinforced Ply Material
Stress Limits group or Stress tab
XT	Tensile stress allowable in 1–direction	Tension (ST)	Tension (ST1)	Max Stress Tension1
XC	Compressive stress allowable in 1–direction	Compression (SC)	Compression (SC1)	Max Stress Compression1	Must be > 0
YT	Tensile stress allowable in 2–direction	Tension (ST)	Tension (ST2)	Max Stress Tension2
YC	Compressive stress allowable in 2–direction	Compression (SC)	Compression (SC2)	Max Stress Compression2	Must be > 0
ZT	Tensile stress allowable in 3–direction, normal to the laminate	Tension (ST)	Tension (ST3)	Max Stress Tension3
ZC	Compressive stress allowable in 3–direction, normal to the laminate	Tension (SC)	Tension (SC3)	Max Stress Compression3
S or S12	Shear stress allowable in 12 plane	Shear (SS)	Shear (S12)	Max in plane Shear Stress (S12)
S13	Shear stress allowable in 13 plane	Shear (SS)	Shear (S13)	Max Shear Stress (S13)
S23	Shear stress allowable in 23 plane	Shear (SS)	Shear (S23)	Max Shear Stress (S23)
Strain Limits group or Strain tab
XTε	Tensile strain allowable in 1–direction	Tension (XT)	Tension (XT1)	Max Strain Tension1
XCε	Compressive strain allowable in 1–direction	Compression (XC)	Compression (XC1)	Max Strain Compression1	Must be > 0
YTε	Tensile strain allowable in 2–direction	Tension (XT)	Tension (XT2)	Max Strain Tension2
YCε	Compressive strain allowable in 2–direction	Compression (XC)	Compression (XC2)	Max Strain Compression2	Must be > 0
ZTε	Tensile strain allowable in 3–direction, normal to the laminate	Tension (XT)	Tension (XT3)	Max Strain Tension3
ZCε	Compressive strain allowable in 3–direction, normal to the laminate	Tension (XC)	Tension (XC3)	Max Strain Compression3
Sε	Shear strain allowable in 12 plane	Shear (XS)	Shear (X12)	Max in plane Shear Strain (X12)
Sε13	Shear strain allowable in 13 plane	Shear (XS)	Shear (X13)	Max Shear Strain (X13)
Sε23	Shear strain allowable in 23 plane	Shear (XS)	Shear (X23)	Max Shear Strain (X23)

Stress and strain allowables are related by the following equations:

Depending on the selected failure theory and the available user-defined allowables (stress or strain), the software may use the above relations to compute any missing data.

Margins of safety are expressed as a percentage and computed using the specified safety factor, FS.

Look up more details

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Laminate failure analysis references

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Laminate failure analysis nomenclature, Simcenter 3D 2021.1 Series

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