关于6061-T6圆柱形外穿孔行为的实验和数值研究
Seon-Woo Byun1, Young-Jung Joo1, Soo-Yong Lee2,3
1Advanced Technology R&D Center, Design Analysis Team, Hanwha Aerospace, 6, Pangyo-ro 319beon-gil, Bundang-gu, Seongnam-si 13488, Gyeonggi-do, Republic of Korea.
Materials (Basel, Switzerland)
|November 14, 2023
概括
本研究估计了使用冲击能量修改的约翰逊-库克 (MJC) 模型的应变率参数,改进了高速冲击模拟. 这种新方法准确地预测了板块透速度和圆柱形目标形状.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算力学 计算力学 计算力学
背景情况:
- 修改后的约翰逊-库克 (MJC) 模型对于模拟高速撞击至关重要.
- 估计MJC模型的应变率参数对于准确的冲击分析至关重要.
- 像Split Hopkinson棒这样的传统方法在实现高张力率方面存在局限性.
研究的目的:
- 提出一种基于冲击能量的新方法来估计MJC模型的延展率参数.
- 用掉重和高速撞击实验验证拟议的方法.
- 评估MJC模型与估计参数在预测弹道撞击结果中的准确性.
主要方法:
- 开发了一种应变速率参数估计技术,利用掉重和高速冲击试验中的冲击能量.
- 在板状和圆柱形目标上进行弹道实验.
- 通过使用MJC模型与新估计的延展率参数进行了数值模拟.
主要成果:
- 使用估计应变率参数的MJC模型准确地预测了板透速度,最大误差约为3.7%.
- 对圆柱形目标穿透的模拟显示了与实验结果相似的形状,误差约为6%.
- 拟议的方法有效地确定了MJC模型应用的延展率参数.
结论:
- 基于冲击能量的方法为估计MJC模型延展率参数提供了可行的替代方案,克服了传统实验技术的局限性.
- 经过验证的MJC模型在预测各种目标几何形状的弹道撞击现象方面表现出高准确性.
- 这项研究提高了对高速撞击场景的数值模拟的可靠性.
相关概念视频
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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
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01:20Plastic Deformation in Circular Shafts
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When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
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01:18Mechanical Characteristics of Steel
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The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
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01:24Circular Shafts - Elastoplastic Materials
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01:18Stress Concentrations in Circular Shafts
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