Lecture 12

Today’s objectives-Composites II ,[object Object],[object Object],[object Object],[object Object]

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

Lecture 12

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Lecture 12