Determination of the onset of yielding and the Young’s modulus after a change in the loading direction

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING

International Journal of Material Forming Pub Date : 2024-03-19 DOI:10.1007/s12289-024-01823-1

Roman Norz, Simon Vitzthum, Maximilian Gruber, Lorenz Maier, Joana Rebelo Kornmeier, Emad Maawad, Fabuer R. Valencia, Steffen Gerke, Michael Brünig, Wolfram Volk

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引用次数: 0

Abstract

The onset of plastic deformation is an important parameter for an accurate description of the flow curve and the Young’s modulus. Determining the actual physical start of flow is already experimentally challenging for classic sheet metal materials. In addition to the experimental challenge, the onset of flow depends on numerous parameters such as strain rate, temperature and forming history. Non-proportional load paths in particular can significantly influence the onset of flow. Three different materials, a micro-alloyed steel HC340LA, a dual-phase steel CR330Y590-DP and an aluminium alloy AA6016-T4 are investigated in this publication. The physical onset of flow of the materials is determined at three different pre-strain levels as well as without and with a change in the load direction. Temperature-based approaches are used for this purpose. In-situ synchrotron diffraction is used to validate the results obtained. Those results can help to improve existing material models and springback prediction. Such models rely on material parameters that are as accurate as possible.

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确定加载方向改变后的屈服起始点和杨氏模量

摘要塑性变形的起始点是准确描述流动曲线和杨氏模量的一个重要参数。对于传统的金属板材来说，确定实际的物理流动起始点在实验上已经是一项挑战。除了实验挑战之外，流动的开始还取决于应变率、温度和成形历史等众多参数。特别是非比例载荷路径会极大地影响流动的开始。本出版物研究了三种不同的材料：微合金钢 HC340LA、双相钢 CR330Y590-DP 和铝合金 AA6016-T4。在三种不同的预应变水平下，以及在不改变载荷方向和改变载荷方向的情况下，确定了材料的物理流动起始点。为此采用了基于温度的方法。现场同步辐射衍射被用来验证所获得的结果。这些结果有助于改进现有的材料模型和回弹预测。这些模型依赖于尽可能精确的材料参数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.