Reference no: EM13887536

Consider the matrix of elastic constants for a composite consisting of an elastically soft matrix reinforced by a 90? cross-ply of stiff ?bers. The general form of the matrix of elastic constants is

s11	s12	s13	0	0	0
s12	s11	s13	0	0	0
s13	s13	s33	0	0	0
0	0	0	s44	0	0
0	0	0	0	s44	0
0	0	0	0	0	s66

Young's modulus for the composite when loaded parallel to one of the sets of ?bers is 100 GPa, so s11 = 10 × 10-12 Pa-1. Of the following values, which is most likely for s12? for s66?

A.  10 × 10-10 Pa-1.

B.  30 × 10-12 Pa-1.

C.  10 × 10-12 Pa-1.

D.  3 × 10-12 Pa-1.

E.  100 × 10-12 Pa-1.

F.  -10 × 10-10 Pa-1.

G.  -30 × 10-12 Pa-1.

H.  -10 × 10-12 Pa-1.

I.  -3 × 10-12 Pa-1.

J.  -100 × 10-12 Pa-1.