工业纯钛J积分的实验、有限元和EPRI解研究（英文）

Experiment,Finite Element Analysis and EPRI Solution for J-integral of Commercially Pure Titanium

通过断裂实验、二维有限元分析(2-D FEA)、三维有限元分析(3-D)以及EPRI解等4种方法获得了工业纯钛(CP Ti)紧凑拉伸试验(CT)的J积分。结果表明,EPRI解获得的J积分与2-D FEA结果吻合,但是它们明显低于实验结果,而3-D FEA获得的J积分更接近于实验值。为了提高J积分的估算精度,提出了基于3-D FEA改进的EPRI解,并用实验结果进行了验证。此外,将由原EPRI解和改进的EPRI解获得的J积分建立的CP Ti失效评定曲线(FAC)与实验结果进行比较,发现EPRI解的改进不仅提高了J积分的估算精度,而且提高了FAC的可靠性。

In this paper, the J-integral of commerciaUy pure titanium （CP Ti） for standard compact tensile （CT） specimen was obtained by four methods containing fracture experiment, two-dimensional （2-D） finite element analysis （FEA）, three-dimensional （3-D） FEA, and the calculation formula in electric power research institute （EPRI）. Although the J-integral obtained by EPRI solution is consistent with that by 2-D FEA, they are lower than the result of the experiment. Moreover, the J-integral obtained by 3-D FEA is more close to that of the experiment. In order to improve the prediction accuracy of J-integral by EPRI solution, the improved EPRI solution was developed based on 3-D FEA and verified by the experiment. In addition, two failure assessment curves （FACs） ofCP Ti correspond- ing to traditional EPRI solution and the improved one were compared with the experimental results, which indicates that the improved EPRI solution not only improve the prediction accuracy of J-integral, but also increases the reliability of FAC.