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代巧,王飞,张健,陈晓阳,周金宇,周昌玉.预应变对含裂纹钛制压力容器失效评定的影响[J].稀有金属材料与工程(英文),2020,49(10):3301~3308.[Dai Qiao,Wang Fei,Zhang Jian,Chen Xiaoyang,Zhou Jinyu and Zhou Changyu.The effect of pre-strain on the failure assessment of titanium pressure vessel with crack[J].Rare Metal Materials and Engineering,2020,49(10):3301~3308.]
The effect of pre-strain on the failure assessment of titanium pressure vessel with crack
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Received:August 17, 2019  Revised:December 04, 2019
DOI:
Key words: pre-strain  failure assessment curve  crack  commercially pure titanium  pressure vessel
Foundation item:国家自然科学基金项目(51805230),江苏省高校自然科学重点研究项目(16KJA460002),江苏省绿色过程装备重点实验室(GPE201801)
Author NameAffiliation
Dai Qiao,Wang Fei,Zhang Jian,Chen Xiaoyang,Zhou Jinyu and Zhou Changyu  
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Abstract:
      To understand the effect of pre-strain on the integrity assessment of titanium structure with crack, the dependence of tensile mechanical parameters, fracture toughness, failure assessment diagram (FAD) on pre-strain were focused. Firstly, tensile tests revealed that, the yield stress and the yield-ultimate strength ratio increased, but the ductility decreased with pre-strain value, while the fracture toughness was decreasing with pre-strain. Then, based on finite element (FE) analyses of compact tension (CT) specimen and titanium pressure vessel with crack, the plastic zone near the crack tip was decreasing with pre-strain, resulting in the decreasing of J-integral. Moreover, the failure assessment curves (FAC) of Options 1 and 3 in BS 7910: 2013 were varying with pre-strain, and the acceptable area was decreasing. Therefore, the reserve factor on yield stress increased with pre-strain, but that on fracture toughness decreased significantly. In brief, the pre-strain significantly affects the failure assessment of titanium pressure vessel with crack, and needs to be considered in the integrity assessment.