Residual stress and thermal expansion of graphite epoxy laminates subjected to cryogenic temperatures

摘要: In composite structures understanding and quantifying the existence of residual stresses is a very important issue. The presence these can lead to unexpected failure as seen in fuel tank X-33 reusable launch vehicle. A study into development function temperature was performed help provide insight this situation. recently developed optical technique, cure reference method, modification traditional strain gage techniques were used pursuit. Diffraction gratings gages applied IM7/977-2 panels differing stacking sequences. Strains measured under no load while varied. Consequently between plies method calculate them proposed. Residual stress levels dependent on sequence quasi-isotropic laminates perform poorly when exposed cryogenic temperatures. Laminates should be optimized account for both mechanical thermal loading.