1. Given a graphite/epoxy lamina with fiber orientation angle = 60 degrees, with the strength properties...
1. Given a graphite/epoxy lamina with fiber orientation angle = 60 degrees, with the strength properties listed below and subjected to a state of stress {σ x, σ y, T xy}
= {2B, -3B, 4B} where B is some variable to be determined.
a. Draw a complete and correct FBD for this lamina.
b. Using Tsai-Wu Failure criterion, find the value of B that causes failure of this lamina.
Material Properties: Xt = 1500 MPa, Xc = 1500 MPa, Yt = 40 MPa, Yc
= 246 MPa, S = 68 MPa
Approximate answer: B = 21 +/- 10% (units you figure out)
Homework Answers
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1. Given a graphite/epoxy lamina with fiber orientation angle =
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do the calculations by hand but must show your work. Use the lamina
properties provided in Lesson 3, Slide 19 in SI units. The lamina
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xy} = {125, -10,
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including all relevant coordinate systems. b. Calculate the strains
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