Experimental studies and the model of anisotropic plasticity for additively manufactured stainless steel with stress state dependent properties

IF 1.9 4区工程技术 Q3 MECHANICS

Continuum Mechanics and Thermodynamics Pub Date : 2024-02-22 DOI:10.1007/s00161-024-01286-4

Alexey Fedorenko, Boris Fedulov, Stanislav Evlashin, Oleg Staroverov, Alexander Pankov, Svetlana Shalnova, Evgeny Lomakin

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Abstract

In this study the mechanical anisotropy of laser powder bed fusion (LPBF) 316L stainless steel under tensile, compressive, and shear loading in different orientations with respect to the build direction is investigated. Experimental analysis revealed a moderate degree of anisotropy, which is mainly attributed to the build direction. In addition, the mechanical properties were seen to be dependent on the stress state, as evidenced by the tension-compression asymmetry. The anisotropy and asymmetry can be explained by various microstructural factors with texture orientation being one of the most significant. To incorporate such material behavior in structural analysis, a phenomenological model for anisotropic plasticity and tension-compression asymmetry was proposed and calibrated for additive 316L steel. The flexibility of the model allows it to be applied using a mechanical test set on uniaxial loading, and further enhancements may rely on data for combined stress state. The model was calibrated based on FEA of samples loading and fit well all experimental curves, though factors such as residual stresses and test imperfections could introduce some discrepancies.

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各向异性塑性的实验研究和应力状态依赖性添加制造不锈钢模型

本研究探讨了激光粉末床熔融（LPBF）316L 不锈钢在拉伸、压缩和剪切载荷作用下相对于构建方向的不同方向的机械各向异性。实验分析显示了中等程度的各向异性，这主要归因于构建方向。此外，机械性能还取决于应力状态，拉伸-压缩不对称就是证明。各向异性和不对称可由各种微结构因素解释，其中纹理取向是最重要的因素之一。为了将这种材料行为纳入结构分析，我们提出了各向异性塑性和拉伸-压缩不对称的现象学模型，并对添加剂 316L 钢进行了校准。该模型的灵活性使其可以通过单轴加载的机械测试集来应用，进一步的改进可依赖于组合应力状态的数据。该模型根据样品加载的有限元分析进行校准，与所有实验曲线拟合良好，但残余应力和测试缺陷等因素可能会带来一些差异。

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来源期刊

Continuum Mechanics and Thermodynamics 物理-力学

CiteScore

5.30

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： This interdisciplinary journal provides a forum for presenting new ideas in continuum and quasi-continuum modeling of systems with a large number of degrees of freedom and sufficient complexity to require thermodynamic closure. Major emphasis is placed on papers attempting to bridge the gap between discrete and continuum approaches as well as micro- and macro-scales, by means of homogenization, statistical averaging and other mathematical tools aimed at the judicial elimination of small time and length scales. The journal is particularly interested in contributions focusing on a simultaneous description of complex systems at several disparate scales. Papers presenting and explaining new experimental findings are highly encouraged. The journal welcomes numerical studies aimed at understanding the physical nature of the phenomena. Potential subjects range from boiling and turbulence to plasticity and earthquakes. Studies of fluids and solids with nonlinear and non-local interactions, multiple fields and multi-scale responses, nontrivial dissipative properties and complex dynamics are expected to have a strong presence in the pages of the journal. An incomplete list of featured topics includes: active solids and liquids, nano-scale effects and molecular structure of materials, singularities in fluid and solid mechanics, polymers, elastomers and liquid crystals, rheology, cavitation and fracture, hysteresis and friction, mechanics of solid and liquid phase transformations, composite, porous and granular media, scaling in statics and dynamics, large scale processes and geomechanics, stochastic aspects of mechanics. The journal would also like to attract papers addressing the very foundations of thermodynamics and kinetics of continuum processes. Of special interest are contributions to the emerging areas of biophysics and biomechanics of cells, bones and tissues leading to new continuum and thermodynamical models.