Woven General Tab

Specify the strengths of your woven lamina.

Fields I, K, and L must be specified on the General tab, while field J is optional (see image on previous page):

I - Ultimate Lamina Strengths (required)

Three ultimate strengths are required to characterize a woven composite.

J - Weave Knee Strengths (optional)

The weave knee strengths correspond to the stresses at which matrix failures occur in a tow. If the knee strengths are unknown, they will be automatically calculated based upon the ultimate strengths and the material system specified. For additional information regarding knee strengths, please refer to Appendix D.

K - Weave Geometry (required)

Some of these values may not be available from standard manufacturing data sheets. Refer to Appendix E for guidance.

For a balanced weave, the Fill and Warp Volume Fractions must be equal, and inside the ranges given below:

For an unbalanced plain weave, the sum of the Fill and Warp Volume Fractions must be less than 0.68 (Note: 4, 5, and 8-harness satin weaves must be balanced and require Abaqus to create).

L - Weave Degradation (required)

These parameters are constants used to degrade the fiber and matrix after a failure is predicted in Simulation Composite Analysis. When a matrix failure event is predicted, the elastic constants of the matrix are degraded by the parameter specified for Matrix Degradation. When a fiber failure event is predicted, the fiber elastic constants are degraded by the parameter specified for the Fiber Degradation and the matrix elastic constants are degraded by the value specified for the Matrix Degradation. These parameters may be overridden when performing an analysis with Simulation Composite Analysis and are used by Composite Material Manager to predict the properties of the composite after a failure event to reduce overhead in the analysis. The recommended value for matrix degradation is 0.1, and the recommended value for fiber degradation is 0.01. For more information on degradation parameters and their significance to Simulation Composite Analysis, please refer to the Theory Manual and the Simulation Composite Analysis User's Guide.