A comprehensive solution to miniaturized tensile testing: Specimen geometry optimization and extraction of constitutive behaviors using inverse FEM procedure
A comprehensive solution to miniaturized tensile testing: Specimen geometry optimization and extraction of constitutive behaviors using inverse FEM procedure
复制标题
小型化拉伸测试的综合解决方案：使用逆 FEM 程序优化样本几何形状并提取本构行为
DOI：
10.1016/j.fusengdes.2017.07.016
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发表时间：
2017-10-01
影响因子：
1.7
通讯作者：
Zhang, Lei
中科院分区：
文献类型：
--
作者：
Liu, Haiting;Shen, Yao;Zhang, Lei
由于辐照装置的体积限制和对试样放射性的严格限制，小试样在核反应堆结构材料的力学试验中得到了广泛的应用。本文提出了一种新颖的两轮方法来优化狗骨型小平板拉伸试样的设计。首先，从文献中的下限选取试件厚度，并优化平行截面的宽度，以降低试件处理的难度。其次，采用CLF-1和QP 980钢对4种简化平行截面长度候选试件进行了试验研究，并通过自动逆有限元程序从试验结果中提取了其本构行为;通过评价试验结果的重复性和本构行为与标准试件的一致性，对4种候选试件进行了优化。具有2 mm长的平行截面（厚度为0.2mm，宽度为1 mm）的试样几何形状具有最好的性能，因此它被认为是用于熔融辐照的小型化拉伸测试的初步优化。这项研究表明，当试样厚度由于可能偏离体积特性而不能进一步减小时，借助逆有限元程序提取材料本构行为来大幅缩短平行截面是可行的。(C)2017爱思唯尔B. V.保留所有权利。
Small specimens have been widely used in the mechanical testing for structural materials of nuclear reactors, due to the volume constraint of irradiation facilities and the stringent limits on specimen radioactivity. This article proposes an innovative two-round approach to optimize the design of dog bone typed small flat tensile specimens. Firstly, the specimen thickness was chosen from the lower bound in the literatures, and the width of the parallel section was optimized to reduce the difficulty for specimen handling. Secondly, four candidates for reduced parallel section length were experimentally tested with CLF-1 and QP980 steels, whose constitutive behaviors were extracted from the testing results by an automatic inverse FEM procedure; such specimen candidates were optimized by evaluating the repeatability of the testing results and the consistency of the constitutive behaviors with those of the standard specimen, respectively. The specimen geometry with a 2 mm long parallel section which has a thickness of 0.2 mm and a width of 1 mm, has the best performance and hence it is regarded as a preliminary optimization for the miniaturized tensile testing towards application in fusion irradiation. This study demonstrates the feasibility to drastically shorten the parallel section with the help of the inverse FEM procedure to extract material constitutive behaviors, when the specimen thickness cannot be further reduced due to the possible deviation from bulk properties. (C) 2017 Elsevier B.V. All rights reserved.