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+//Example 14.5//
+
+Em=6.9*10^3;//MPa //polymeric matrix modulus
+Ef=72.4*10^3;//MPa //E- glass -reinforced epoxy
+vm=0.4; //volume fractions of matrix and fibers
+vf=0.6; //volume fractions of matrix and fibers
+Ec=vm*Em+vf*Ef
+mprintf("Ec = %e MPa",Ec)