40TH ANNIVERSARY Figure 8 Photomicrographs of quenched surfaces of (0y90)3s Nicalon/CAS with crack patterns superimposed for ATs of(a)350C,(b)500C and (c) 3.2.2. The(90/0 l3s laminate ature differentials higher than400°C,ie.△Te=400°C The description of this laminate is similar to that of the for this laminate. In general, thermal shock damage in (0 / 90%)3s laminate except that the central ply is now Ll. this laminate for the range of temperature differentials not Tl, and the next plies are Tl, not Ll, and so on, ending investigated was in the form of PMCs and HMCs with T3 outer plies HMCs as a result of thermal shock were first visible on Slfe hn itial damage due to thermal shock was detected on the this laminate after quenching through AT=400 C. They rfaces of this laminate after quenching through temper- could be seen to propagate along the surface of the 9040TH ANNIVERSARY Figure 8 Photomicrographs of quenched surfaces of (0/90)3s Nicalon/CAS with crack patterns superimposed for
Ts of (a) 350◦C, (b) 500◦C and (c) 700◦C. 3.2.2. The (90◦/0◦)3s laminate The description of this laminate is similar to that of the (0◦/90◦)3s laminate except that the central ply is now L1, not T1, and the next plies are T1, not L1, and so on, ending with T3 outer plies. Initial damage due to thermal shock was detected on the surfaces of this laminate after quenching through temper￾ature differentials higher than 400◦C, i.e.
Tc = 400◦C for this laminate. In general, thermal shock damage in this laminate for the range of temperature differentials investigated was in the form of PMCs and HMCs. HMCs as a result of thermal shock were first visible on this laminate after quenching through
Tc = 400◦C. They could be seen to propagate along the surface of the 90◦ 957