对Ti6Al4V合金进行小型冲击测试,并在不同应力三轴度下进行模拟
Kun Wang1, Xilong Zhao2, Zeyu Cao2
1School of Civil Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou 730070, China.
Materials (Basel, Switzerland)
|September 14, 2024
概括
使用小孔试验调查局部材料特性显示,样品几何学显著影响压力下的机械行为. 量身定制样本形状可以增强应力三轴性,帮助确定构成性关系.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 金工业是金工业的一个方面.
背景情况:
- 了解不同应力状态下的局部材料特性对于工程应用至关重要.
- 像Ti6Al4V这样的合金被广泛使用,但需要详细的机械表征.
- 应力三轴性显著影响材料故障机制.
研究的目的:
- 研究Ti6Al4V合金在各种应力三轴度下的机械性能.
- 分析样品几何形状和隙形状对材料行为的影响.
- 建立压力状态,空洞进化和骨折形态之间的相关性.
主要方法:
- 自主设计的小穿孔测试是在不同的几何形状和形状的Ti6Al4V样本上进行的.
- 开发了有限元 (FE) 模型,并根据实验小穿孔测试数据进行了验证.
- 使用经过验证的FE模型分析了应力,应变和空虚体积分量的分布.
主要成果:
- 在测试过程中,机械性能随样品几何形状而显著变化.
- 在样本的中央区域观察到一个复杂的压力状态,包括三维紧张.
- 空虚体积分数超过了中部的断裂空虚体积分数,表明断裂前的微观结构变化.
- 骨折形态,特别是球状头样中的穴特征,证实了各种压力状态.
结论:
- 样本几何学修改是一种有效的方法来控制和增加应力三轴性.
- 该研究成功确定了Ti6Al4V在不同压力状态下的构成关系.
- 了解应力三轴效应是预测Ti6Al4V性能和工程元件故障的关键.
相关概念视频
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