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Today’s objectives-Composites II ,[object Object],[object Object],[object Object],[object Object]
Types of composites
Review from last class-Particulate Composites ,[object Object]
Fiber Reinforced ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],d L c
Fiber composites ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Matrix phase ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Fiber Reinforced ,[object Object],[object Object],[object Object],[object Object],L c  is approximately 1 mm for glass fiber / Carbon matrix composites (20 to 150 * diameter). ,[object Object],d L c
Stress along a fiber ,[object Object],[object Object],[object Object]
Optimal fiber length ,[object Object],Poorer fiber efficiency Better fiber efficiency •   Ex: L c  is 1mm for glass fiber in the C matrix, so the optimal fiber length is about 30mm. ,[object Object],fiber diameter shear strength of fiber-matrix interface or the matrix itself (whichever is smaller) fiber strength in tension
Continuous and aligned fibers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],F
Longitudinal loading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Remember: E= modulus (GPa), sigma = stress (MPa), epsilon = strain (ratio) F
Transverse loading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],F
Tensile strength review: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Particle and Fiber variables ,[object Object],Volume increases Thinner and longer is better. Longitudinal or transverse equations apply
SUMMARY ,[object Object],[object Object],Reading for next class Short Fibers, Structural Composites Chapter sections: 16.8, 16.10-15

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Lecture 12