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 initi￾ated 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