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Z -M. Huang/Composites Science and Technology 64(2004)529-548 compressive transverse stress component is similar to with a compressive transverse stress component the measured one. However, discrepancy in magnitude involved. This is mainly attributed to the fact that the exists. In general, the prediction overestimated a point resin tensile strength used is somewhat"higher"than on the failure envelope with a tensile transverse stress the in situ resin tensile strength whereas the resin com- component involved whereas underestimated a point pressive strength used is somewhat"lower"than the in Theory(initial failure, with 1000 thermal effect) Theory final failure =1.5a+34.4 o Test results(final fa Theory(final failure, without thermal effect 1000 500 500 1000 1000 y-direction stress(MPa) Fig. 4. Measured and predicted biaxial failure stresses for[90/#30%] laminate subjected to combined oyy and axx. Material type: E-Glass/LY556 Theory(initial failure, with thermal effect Theory(final failure, with hermal effect) Test results(final failure) Theory(final failure, without 300 thermal effect) X-direction stress(MPa) Fig. 5. Measured and predicted biaxial failure stresses for [90/+30] laminate subjected to combined Oxr and Txy. Material type: E-Glass/LY556compressive transverse stress component is similar to the measured one. However, discrepancyin magnitude exists. In general, the prediction overestimated a point on the failure envelope with a tensile transverse stress component involved whereas underestimated a point with a compressive transverse stress component involved. This is mainlyattributed to the fact that the resin tensile strength used is somewhat ‘‘higher’’ than the in situ resin tensile strength whereas the resin compressive strength used is somewhat ‘‘lower’’ than the in Fig. 4. Measured and predicted biaxial failure stresses for [90/30]s laminate subjected to combined yy and xx. Material type: E-Glass/LY556 epoxy. Fig. 5. Measured and predicted biaxial failure stresses for [90/30]s laminate subjected to combined xx and xy. Material type: E-Glass/LY556 epoxy. 532 Z.-M. Huang / Composites Science and Technology 64 (2004) 529–548