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本文对碳纤维(CF),Kevlar 49纤维(KF),玻璃纤维(GF)及其层内混杂复合材料压力容器的成型工艺和双轴力学性能进行了试验研究。对容器在内压作用下因刚度退化所引起的非线性应力应变行为,用逐步线性刚度退化理论进行拟合,所得理论值和实验结果相当吻合。水压试验和应变测试表明,在KF压力容器中加入CF,并使强度基本不变的前提下,可明显提高容器的刚度,基体的开裂强度有可能提高近3倍。若CF—GF层内混杂,则表现出较大的负混杂效应。
In this paper, the forming process and biaxial mechanical properties of carbon fiber (CF), Kevlar 49 fiber (KF), glass fiber (GF) and its hybrid composite pressure vessel were studied. The non-linear stress-strain behavior of the container due to stiffness degradation under internal pressure was fitted by a step-by-step linear stiffness degeneration theory. The theoretical results obtained are in good agreement with the experimental results. Hydrostatic test and strain test show that under the premise of adding CF to KF pressure vessel and making the strength almost unchanged, the rigidity of the vessel can be obviously increased, and the cracking strength of the substrate may be increased by nearly 3 times. If the CF-GF layer mixed, then showed a greater negative mixed effect.