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Unformatted text preview: (d) Increase annealing temperature of an undrawn polymer: (Increase / Decrease) the tensile strength Increase the percent crystallinity, crystallite size and perfection. For undrawn polymers, increasing annealing temperature leads to an increase in tensile strength and a decrease in ductility. This is opposite to metals. 2. (14 pts) Your goal is to design a Kevlar Fiber/Epoxy Matrix composite material such that it strains 0.15% under a stress of 100 MPa. Using the data below, what are the corresponding volume fractions necessary for each material? (Assume an isostrain loading condition and that all loading is elastic in nature.) Material Elastic Modulus, GPa Kevlar Fiber 124 Epoxy Matrix 2.5 % 53 53 . 47 . 1 % 47 47 . ) 1 ( 124 5 . 2 7 . 66 7 . 66 10 67 . 6 0015 . 100 1 4 = = = = = + = = = = = = + + = f V m V m V GPa m V GPa GPa GPa MPa MPa E f V m V f V f E m V m E c E C C C...
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This note was uploaded on 04/03/2012 for the course MSE 230 taught by Professor Trice during the Spring '08 term at Purdue University-West Lafayette.
- Spring '08