Research on Calculation Method for Hydrogen Induced Stress Corrosion Fracture Toughness of Metal in Deep Sea
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摘要: 针对钛合金在深海环境下的氢致应力腐蚀开裂问题, 通过应力诱导扩散方法计算氢在金属中的扩散, 将氢降低金属表面能机理引入到氢致开裂过程, 利用ABAQUS有限元软件结合Python二次开发实现对裂纹尖端材料脆化与裂纹扩展循环作用过程的模拟。经过既有文献试验标定, 计算误差为11%, 证明在每个裂纹开展循环起始时在裂纹尖端更新临界断裂表面能的方法有效, 具有可行性。结果表明, 氢会在裂纹尖端应力水平较高区域富集, 而环境压力会加剧这一过程, 某牌号钛合金在5 000 m和10 000 m海深的HISCC断裂韧性分别降低至室内条件下的31.16%和22.28%。Abstract: Focusing on the hydrogen induced stress corrosion cracking（HISCC） of titanium alloy in deep sea,this paper calculated hydrogen diffusion in metal with the stress induced diffusion method and introduced the hydrogen reducing surface energy model into HISCC process to simulate the cycling of the material embrittlement of crack tip and crack propagation by finite element software ABAQUS combined with the secondary development of Python.Calibrated with the experiment in existing literature,the calculation error is 11%,which proves that the method for updating the critical fracture surface energy of the crack tip at the beginning of each crack is effective and feasible.The results show that,hydrogen will concentrate on the crack tip where the stress is relatively higher,and the environmental pressures will intensify this process.The HISCC fracture toughness of a titanium alloy at 5 000 and 10 000 depth reduces to 31.16%and 22.28% of that in the indoor environment,respectively.
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