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由先进的复合材料制成的压力容器用在许多尖端的和临界强度的设计中,例如,其中包括火箭发动机壳体。但是对纤维复合材料结构的破坏准则还不完全了解。以前利用实验室双向试验设备对普通碳/环氧树脂层压材料的破坏研究表明对拉伸载荷,纤维方向额定应力或应变可作为破坏准则,而与应力状态无关。分析了压力容器增强材料最近的双向试验结果,结果表明与以前的研究相符。由此说明用纤维方向的额定应力或应变作为破坏准则可设计碳/环氧树脂压力容器,类似的破坏准则适用于更多的普通的碳/环氧树脂层压材料。
Pressure vessels made of advanced composite materials are used in many cutting edge and critical strength designs, including, for example, rocket motor housings. However, the failure criteria for fiber composite structures are not fully understood. Previous studies using conventional laboratory bi-directional test equipment on ordinary carbon / epoxy laminates have shown that tensile stress, nominal stress or strain in the fiber direction can be used as a criterion of failure regardless of the stress state. The recent two-way test results of pressure vessel reinforcements were analyzed and the results show that they are consistent with previous studies. This shows that carbon / epoxy pressure vessels can be designed with failure criteria as a function of the nominal stress or strain in the direction of the fiber. A similar failure criterion applies to more common carbon / epoxy laminates.