Z -M. Huang/Composites Science and Technology 64(2004)529-548 nsverse tensile strength of the UD lamina. In other Table I of Ref. [1]. On the other hand, the provided words, the predicted transverse tensile strength of the transverse compressive strength of the lamina, 114 lamina based on 56.5 MPa resin tensile strength was MPa, was lower than the compressive strength data higher than the 35 MPa measured value, as indicated in shown in Fig. 1, which are around 138 MPa, resulting in 1200 Theory (y-strain, without thermal residual stresses) Theory(x-strain, without thermal residual stresses) Test results (y-strain) 1000 Test results(x-strain) Theory (y-strain, with thermal residual stresses) Theory(x-strain, with thermal residual stresses 00 200 Fig8. Measured and predicted oyy VS Eyy and ayy VS Exr curves for [901+450/00] laminate under biaxial tensions(o,/oxx=2/1)Material type AS4/3501-6 Theory (final failur thermal residual stresses) Theory (final failure, with thermal residual stresses) 500 Test results(final failure, withou o Test results(final failure, with linen 250 A Test results(final failure withou liner, thick tubes) 1250 750 25 与 750 1250 250 y-stress(MPa) Fig 9. Measured and predicted biaxial failure stresses for [+55]s laminate subjected to combined ayy and Oxx. Material type: E-Glass/MY750
transverse tensile strength of the UD lamina. In other words, the predicted transverse tensile strength of the lamina based on 56.5 MPa resin tensile strength was higher than the 35 MPa measured value, as indicated in Table 1 of Ref. [1]. On the other hand, the provided transverse compressive strength of the lamina, 114 MPa, was lower than the compressive strength data shown in Fig. 1, which are around 138 MPa, resulting in Fig. 8. Measured and predicted yy vs. "yy and yy vs. "xx curves for [90/45/0]s laminate under biaxial tensions yy=xx ¼ 2=1 . Material type: AS4/3501-6. Fig. 9. Measured and predicted biaxial failure stresses for [55]s laminate subjected to combined yy and xx. Material type: E-Glass/MY750. 534 Z.-M. Huang / Composites Science and Technology 64 (2004) 529–548
Z.M. Huang/ Composites Science and Technology 64(2004)529-548 a lower resin compressive strength used(55.7 MPa). If combined transverse and in-plane shear loads was initi- the lamina transverse strength were specified as 138 ated from the resin failure, the predicted lamina failure MPa, the retrieved resin compressive strength would be loads, if resulted in resin tensile failure, would be higher 69.3 MPa. As the lamina failure when subjected to the han the measured values and the predicted lamina 1000 Theory (y-strain, without thermal residual stresses) Theory(x-strain, without thermal residual stresses) Test results (y-strain) 800 Test results (x-strain) Theory (y-strain, with thermal residual stresses) Theory(x-strain, with thermal residual stresses) Failure of lined specimens 600 Failure ( Leakage)of sp 0 Fig 10. Measured and predicted oyy vS. Eyy and oyy vS. Exr curves for [+55] laminate under uniaxial tension(yr/oxx= 1y0). Material type E-Glass/MY750 Theory (y-strain, without thermal residual stresses) a theory (x-strain, without thermal residual stresses) Theory (strain, with thermal residual stresses Theory(x-strain, with thermal residual stresses (y-strail Test results(x-strain Failure of lined specimens Failure( Leakage)of unlined specimens rain( %) Fig. Il. Measured and predicted oyy vS Eyy and ayy vS. Exx curves for [+55]s laminate under biaxial tensions (or/oxr=2/1). Material type:
a lower resin compressive strength used (55.7 MPa). If the lamina transverse strength were specified as 138 MPa, the retrieved resin compressive strength would be 69.3 MPa. As the lamina failure when subjected to the combined transverse and in-plane shear loads was initiated from the resin failure, the predicted lamina failure loads, if resulted in resin tensile failure, would be higher than the measured values and the predicted lamina Fig. 10. Measured and predicted yy vs. "yy and yy vs. "xx curves for [55]s laminate under uniaxial tension yy=xx ¼ 1=0 . Material type: E-Glass/MY750. Fig. 11. Measured and predicted yy vs. "yy and yy vs. "xx curves for [55]s laminate under biaxial tensions yy=xx ¼ 2=1 . Material type: E-Glass/MY750. Z.-M. Huang / Composites Science and Technology 64 (2004) 529–548 535