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首页> 外文会议>Symposium on Small Specimen Test Techniques: Fourth Volume; Jan 23-25, 2000; Reno, Nevada >Small Punch Test: EPRI-CEA Finite Element Simulation Benchmark and Inverse Method for the Estimation of Elastic Plastic Behavior
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Small Punch Test: EPRI-CEA Finite Element Simulation Benchmark and Inverse Method for the Estimation of Elastic Plastic Behavior

机译：小冲孔试验：EPRI-CEA有限元模拟基准和估计弹性塑性行为的逆方法

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摘要

Prolonging the service life of nuclear power plants and more stringent safety requirements are increasing the need for miniature mechanical tests such as the Small Punch Test (SPT). This test was initially developed in the early 1980s at MIT and further developments with more extensive use were achieved by EPRI with a continuous program between 1990 and 1999. The present investigation is first based on a finite element simulation benchmark between EPRI and CEA. This provided a reciprocal validation of the numerical simulation of this test for an A533 B steel at room temperature. The loading mode progressively evolves from bending towards biaxial membrane loading of the specimen. Strain energy density was also computed as the failure criterion and the maximum value observed at experimental crack initiation is about 116 MJ/m~3. A parametric finite element study was undertaken in order to evaluate the influence of factors such as specimen thickness, friction, yield strength, strain hardening coefficient, etc. Starting from this parametric study, an automatic routine was built which estimates the elastic-plastic Ramberg-Osgood stress strain relation. The need for standardization of this test will be underlined.
机译：延长核电站的使用寿命和更严格的安全要求正在增加对微型机械测试（例如小冲床测试（SPT））的需求。该测试最初是在1980年代初期由麻省理工学院开发的，EPRI通过在1990年至1999年间的连续计划实现了更广泛应用的进一步发展。本研究首先基于EPRI和CEA之间的有限元模拟基准。这为在室温下对A533 B钢进行此测试的数值模拟提供了相互验证。加载模式从弯曲向样品的双轴膜加载逐步发展。还以应变能密度作为破坏准则，实验裂纹萌生时的最大值约为116 MJ / m〜3。为了评估诸如试样厚度，摩擦，屈服强度，应变硬化系数等因素的影响，进行了参数有限元研究。从该参数研究开始，建立了一个自动程序，用于估算弹塑性Ramberg- Osgood应力应变关系。将强调该测试的标准化需求。

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