me426midterm

# me426midterm - MSE/ME426 Midterm NAME 1 A composite...

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Unformatted text preview: MSE/ME426 Midterm (2/28/06) NAME_______________________ 1. A composite material is made of glass fibers and an epoxy matrix. If the curing temperature is 150oC and the service temperature is -50oC, find the axial thermal residual stress in each constituent in service condition based on the single fiber model (df= 10 m , dc= 12 m ) shown below. The material properties of individual constituents are f = 5 x 10-6/oC, Ef = 70 GPa, m = 45 x 10-6/oC and Em = 5 GPa. (6) df= 10 m 10 dc= 12 m 2. A square fabric is made of three identical fiber yarns; one of them is aligned in ydirection as shown below. Find the orientations of the remaining two fiber yarns so the fabric has identical strength in both x-direction and y-direction. (6) y x 3. A square composite lamina has dimensions of 10cm x 10cm and is loaded with a uniaxial tension of 1GPa as shown below. Draw the deformed shape of the composite lamina and specify the deformed dimensions and angles in it. The engineering constants of the composite are as follows: E1= 100GPa, E2= 10GPa, G12= 5GPa and 12 = 0.25. (8) y 30o x ...
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## This note was uploaded on 07/25/2008 for the course ME 426 taught by Professor Liu during the Spring '06 term at Michigan State University.

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me426midterm - MSE/ME426 Midterm NAME 1 A composite...

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