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首页> 外文期刊>The Journal of Strain Analysis for Engineering Design >A nonlinear simulation of a bi-failure specimen through improved discretisation methods: A validation study
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A nonlinear simulation of a bi-failure specimen through improved discretisation methods: A validation study

机译：通过改进离散化方法对双失效试样进行非线性模拟：一项验证研究

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摘要

A robust and efficient scheme is rendered to elastoplastically study the material nonlinearity of structural components. In this investigation, a specimen manufactured from the aluminium alloy AA6061-T6 is considered. It is mechanically loaded under a uniaxial tensile state and the experimental strain datum is analysed by three-dimensional digital image correlation. Due to specific specimen geometry, complex stress states will occur. However, the specimen yields due to an approximated uniaxial stress state. The obtained remote stress/strain from experimental data is used to validate the computational solutions using advanced discretisation approaches. Therefore, as a preliminary numerical study, the model is simulated through the finite element method formulation. Afterwards, another numerical strategy is adopted – the radial point interpolation method. The Newton–Raphson initial stiffness method is thereby adapted to complete the nonlinear solutions algorithm. Furthermore, the elastoplastic demeanour of aluminium alloys is determined with the von Mises yield criterion, an isotropic hardening rule and an associative flow rule. Obtained computational results fit the experimental digital image correlation solution, which allow to conclude that the proposed meshless methodology is efficient and reliable.
机译：提出了一种鲁棒而有效的方案，以弹塑性研究结构部件的材料非线性。在这项研究中，考虑了由铝合金AA6061-T6制成的样品。在单轴拉伸状态下对其进行机械加载，并通过三维数字图像相关性分析实验应变数据。由于特定的试样几何形状，会出现复杂的应力状态。但是，样品的屈服归因于近似的单轴应力状态。从实验数据获得的远程应力/应变用于验证使用高级离散化方法的计算解决方案。因此，作为初步的数值研究，通过有限元方法公式模拟了该模型。此后，采用了另一种数值策略-径向点插值法。牛顿-拉夫森初始刚度方法因此适用于完成非线性解算法。此外，用冯·米塞斯屈服准则，各向同性硬化规则和缔合流动规则确定铝合金的弹塑性行为。获得的计算结果适合于实验数字图像相关性解决方案，这可以得出结论，所提出的无网格方法是有效且可靠的。

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