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用传统方法设计的压缩机整体式高压气缸经常发生断裂,已成为压缩机行业重大的技术障碍之一。本文用断裂力学的观点,结合高压气缸的结构因素、材料性质和载荷谱特性,导出设计计算高压气缸的可靠性准则,并用不同材质的320atm高压气缸本体试样进行裂纹发展规律的实验研究,实验中采用的载荷比模拟实际气缸的压力比.根据实验数据给出保证可靠性所允许的应力幅度、裂纹(缺陷)尺寸及相应的界限应力强度因子幅度⊿K_(th)的控制指标.
Compressors designed by traditional methods The integral high-pressure cylinder often breaks, which has become one of the major technical obstacles in the compressor industry. Based on the fracture mechanics, combined with the structural factors, material properties and load spectrum characteristics of the high-pressure cylinder, the reliability criteria for the design and calculation of the high-pressure cylinder are deduced. The crack growth law of the 320atm high-pressure cylinder with different materials is experimentally studied. The load ratio used in the simulation of the actual cylinder pressure ratio.According to the experimental data to give the guaranteed reliability of the allowable stress amplitude, crack (defect) size and the corresponding limit stress intensity factor amplitude ⊿ K_ (th) control index.