Quiz

1. There is a number of sources for residual stresses in composites such as:stresses in composites such as:

a) Hardness mismatch.b) Mi t h f th l i ffi i tb) Mismatch of thermal expansion coefficient.c) Density difference.

Quiz

2. The stresses at the interface are compressive in radial direction Ifin radial direction. If

a) αf <αm

b) >b) αf >αm

Quiz

3. Put √ or X:) C i t t th i t f l d ta) Compressive stresses at the interface led to a

strong bonded interface which attract thek t itcracks to cross it.

b) Trangranular facture means high fracturetoughness.

c) Good wetting or contact obtained if γSV (fiber)SV (fiber)is lower than γLV (matrix)