Z.M. Huang/ Composites Science and Technology 64(2004)529-548 all of the other 10 problems are reasonable. The corre- Problem 1 (Ud E-glass/LY556/HT907/DY063 lamina lation for the problem 3 is slightly less satisfactory. subjected to combined oyy and oxy loads). The theoretical However, relatively large differences have been found and experimental data for this problem are graphed for the problems 4, 6, and 8. Discussions on the correl- in Fig. 1. It is seen that the predicted strength envel- ations of the specific problems are given below ope in variation trend from the tensile to the Theory (final failure, without Theory (final failure, with thermal residual stresses) ○O 可三苏 00 500 500 x-directional stress(MPa) Fig. 2. Measured and predicted biaxial failure stresses for 0 lamina subjected to combined xr and txr. Material type: T300/91 1750 1250 75 1 O Theory (final failure, without thermal residual str Theory(final failure, with thermal residual stresses X-directional stress(MPa) Fig. 3. Measured and predicted biaxial failure stresses for [5] laminate subjected to combined Oxx and orr. Material type: E-Glass/MY750 epoxyall of the other 10 problems are reasonable. The corre￾lation for the problem 3 is slightlyless satisfactory. However, relativelylarge differences have been found for the problems 4, 6, and 8. Discussions on the correl￾ations of the specific problems are given below. Problem 1 (UD E-glass/LY556/HT907/DY063 lamina subjected to combined
yy and
xy loads). The theoretical and experimental data for this problem are graphed in Fig. 1. It is seen that the predicted strength envel￾ope in variation trend from the tensile to the Fig. 2. Measured and predicted biaxial failure stresses for 0
lamina subjected to combined
xx and xy. Material type: T300/914C. Fig. 3. Measured and predicted biaxial failure stresses for [5
]s laminate subjected to combined
xx and
yy. Material type: E-Glass/MY750 epoxy. Z.-M. Huang / Composites Science and Technology 64 (2004) 529–548 531