Resolving high-strain-rate scratch behavior of Ti6Al4V in experiment and meshless simulation

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL Wear Pub Date : 2024-08-30 DOI:10.1016/j.wear.2024.205554
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Abstract

The outstanding strength-to-weight ratio and corrosion resistance of titanium have made it the material of choice in the aerospace industry and medicine. The alpha–beta alloy Ti6Al4V is particularly preferred for its excellent mechanical and bio-compatible properties. Despite its advantages, the low thermal conductivity and poor tribological performance of titanium pose significant challenges during manufacturing and in operation. This research offers deep insights into the high strain rate behavior of Ti6Al4V under abrasive load, such as e.g. experienced in machining, by modifying the standard scratch test setup and using optimized Johnson–Cook material parameters to perform Material Point Method (MPM) simulations. The MPM simulations provide accurate predictions of the data gathered through high strain rate scratch experiments. We found an increase in the von Mises stress distribution as well as the normal and tangential forces required to perform a scratch of the same depth as the strain rate increases. The morphology of the scratch profiles also showed an increase in the height of the ridges that form as the scratching speed increases. These findings are in line with the increase in yield strength and work hardening with growing strain rate. This study bridges the gap between simulation models and experimental observations by providing insights for improved machining strategies and surface treatments that can enhance the performance of Ti6Al4V in demanding applications.

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在实验和无网格模拟中解析 Ti6Al4V 的高应变速率划痕行为
钛具有出色的强度重量比和耐腐蚀性,因此成为航空航天工业和医学领域的首选材料。α-β合金 Ti6Al4V 因其出色的机械性能和生物相容性而尤其受到青睐。尽管钛具有诸多优点,但其低导热性和较差的摩擦学性能在制造和运行过程中带来了巨大挑战。这项研究通过修改标准划痕测试装置和使用优化的约翰逊-库克材料参数来执行材料点法(MPM)模拟,深入探讨了 Ti6Al4V 在磨料负荷(如机械加工中)下的高应变率行为。MPM 模拟可准确预测通过高应变速率划痕实验收集到的数据。我们发现,随着应变速率的增加,von Mises 应力分布以及相同深度的划痕所需的法向力和切向力也在增加。划痕轮廓的形态也显示,随着划痕速度的增加,形成的脊的高度也在增加。这些发现与屈服强度和加工硬化随应变速率增加而增加的现象相一致。这项研究弥补了模拟模型和实验观察之间的差距,为改进加工策略和表面处理提供了启示,从而提高了 Ti6Al4V 在高要求应用中的性能。
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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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