The effects of thermal cycling on stiffness and strength properties were investigated for six composite angle ply laminates having residual stresses induced during curing. The specimens were boron/epoxy, boron/polyimide, graphite/low modulus epoxy, graphite/high modulus epoxy, graphite/polyimide and S-glass/epoxy laminates. One hundred cycles of half hour duration were applied in each case. Half the specimens were unloaded and the other half subjected to a tensile static load equal to 70 percent of the initial static strength of the laminate. All surviving specimens were tested statically to failure in tension and the residual modulus, Poisson's ratio and strength measured and compared with results obtained for uncycled specimens. The variations in residual modulus were generally not significant. Poisson's ratios were in many cases higher. The residual strengths were in general somewhat increased as a result of high temperature thermal cycling.
|Original language||English (US)|
|State||Published - Jan 1 1975|
|Event||Sect 18-B - Washington, DC, USA|
Duration: Feb 4 1975 → Feb 7 1975
|City||Washington, DC, USA|
|Period||2/4/75 → 2/7/75|
ASJC Scopus subject areas