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,2020,49(10):3301~3308.[Dai Qiao,Wang Fei,Zhang Jian,Chen Xiaoyang,Zhou Jinyu,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.]
预应变对含裂纹钛制压力容器失效评定的影响
投稿时间:2019-08-17  修订日期:2019-12-04
中文关键词:  预应变  失效评定曲线  裂纹  工业纯钛  压力容器
基金项目: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)
中文摘要:
      为了分析预应变对含裂纹钛制结构完整性的影响,本文综合研究了预应变对工业纯钛拉伸力学性能、断裂韧性及失效评定图的影响。拉伸试验结果表明:工业纯钛的屈服应力和屈强比均随预应变值增大而增大,而塑性变形能力随预应变值增大而减小,同时断裂韧性随预应变增大而降低。对紧凑拉伸CT试样和含裂纹钛制压力容器进行断裂有限元分析,结果表明:裂纹尖端的塑性区随预应变增大而减小,从而导致J积分值随预应变增大而减小。基于BS7910: 2013的失效评定曲线分析发现:选择1曲线和选择3曲线会随着材料预应变而变化,安全区域逐渐减小。因此,随着预应变的增加,失效评定图中屈服应力的储备系数增加,而断裂韧性的储备系数降低。由本文研究可知:预应变会对失效评定产生显著影响,需要将其考虑到含裂纹钛压力容器的完整性评定中。
The effect of pre-strain on the failure assessment of titanium pressure vessel with crack
英文关键词:pre-strain  failure assessment curve  crack  commercially pure titanium  pressure vessel
英文摘要:
      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.
作者单位E-mail
代巧 江苏理工学院机械工程学院 daiqiao@126.com 
王飞 江苏理工学院机械工程学院  
张健 江苏理工学院机械工程学院  
陈晓阳 江苏理工学院机械工程学院  
周金宇 江苏理工学院机械工程学院  
周昌玉 南京工业大学机械与动力工程学院  
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