Question

ts 6. Why is it difficult to measure the in-plane shear 8. Explain how a 6x6, fully-populated stiffness/compliance matrix with 21 independent stffhess properties 9. Sketch a fictional experimental data set on an X-Y axis along with what an accurate model that capturest 10. In the derivation of E, using a mechanics of materials approach, why is it a good assumption that the fi modulus andshear strength of a composte lamina? List & explain the 2 elastic couplings that anisotropic materials exhibit that isotropic materials do not reduced to a 3x3 system with 4 independent stiffness properties for analysis of thin, fiber-reinfor composite materials. behavior would look like. strain and the matrix strain remain equal?

Answer 1

As you havn't mentioned which one to answer so i am gonna answer 6th question.

Answer(6) :- It is difficult to measure in-plane strength properties like shear modulus and shear strength because it requires a large number of tests because the behavior in tension of heterogeneous materials is frequently very different from that in compression and unlike metals it requires an independent test.

It is difficult also to devise a method which is mechanically simple in application, use relatively small specimen of simple geometry , and subject the specimen to an uniform state of stress.