金属脆性-韧性失效模式转换的三维热弹性-塑性耦合相场模型

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

摘要

动态脆性断裂和剪切带是金属的两种典型失效模式,在 Kalthoff 试验中已观察到脆性-韧性失效模式的转变。本文建立了一个热弹塑耦合三维相场模型来模拟金属的脆-韧性失效模式转变。采用泰勒-昆尼系数随应力三轴性变化的表达式,并利用泰勒-昆尼系数自动调整临界能量释放率。然后,利用提出的模型模拟了 Kalthoff 试验。结果再现了脆性-韧性破坏模式的转变现象,与实验结果十分吻合。可以很好地证明,冲击速度是决定失效模式转变的关键。在低速冲击下,能量不足以驱动剪切带的塑性累积,从而导致脆性拉伸断裂。在高速冲击下,能量足以驱动绝热剪切带的形成,从而导致拉伸剪切破坏。此外,三维模拟显示,在厚度有限的情况下,剪切带尖端呈现新月形的非二维延伸状态。这一数值框架为理解金属在冲击荷载下动态破坏的演变提供了一种预测工具。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A three-dimensional coupled thermo-elastic-plastic phase field model for the brittle-ductile failure mode transition of metals

Dynamic brittle fracture and shear banding are two typical failure modes of metals, and the transformation of the brittle-ductile failure mode has been observed in the Kalthoff test. This paper establishes a thermo-elastic-plastic coupled three-dimensional phase field model to simulate brittle-ductile failure mode transition of metals. The expression for the variation of the Taylor-Quinney coefficient with stress triaxiality is adopted, and the critical energy release rate is automatically adjusted using the Taylor-Quinney coefficient. Then, the Kalthoff test is simulated using the proposed model. The brittle-ductile failure mode transformation phenomenon is reproduced, which agrees well with the experimental results. It can be well proved that impact velocity is crucial in determining the transition to failure mode. At low-velocity impact, the energy is insufficient to drive the plastic accumulation of the shear band, resulting in brittle tensile fracture. At high-velocity impact, the energy is sufficient to drive the formation of adiabatic shear bands, resulting in tensile shear failure. In addition, three-dimensional simulations show that the tip of the shear band exhibits a crescent-shaped non-two-dimensional extension state under finite thickness. This numerical framework provides a predictive tool to understand the evolution of the dynamic failure of metals under impact loading.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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