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在精选激光炼的薄壁增材制造结构中的残余应力的数值研究
Nissar Ahmed1, Imad Barsoum1,2, Rashid K Abu Al-Rub1,2
1Advanced Digital & Additive Manufacturing Center, Khalifa University of Science and Technology, 2533 Abu Dhabi, United Arab Emirates.
Heliyon
|September 4, 2023
概括
本研究使用选择性激光化 (SLM) 模拟了3D打印薄壁结构中的残余应力. 不同的缩影响应力,Ti64显示较高的应力,格子结构经历了弹性特性降低.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 增材制造 增材制造 增材制造
背景情况:
- 选择性激光融 (SLM) 涉及快速加热和冷却,导致3D打印金属零件的残余应力.
- 这些应力可能会对组件的机械完整性和性能产生负面影响.
研究的目的:
- 调查SLM制造的薄壁结构中残余应力的形成和演变.
- 分析不同缩角度对残余应力概况的影响.
- 评估残余应力对格子结构机械性能的影响.
主要方法:
- 用热力学计算建模来模拟SLM过程.
- 对由合金 (Ti64),不钢 (SS316L) 和Inconel (IN718) 制成的薄壁结构进行了分析.
- 这项研究研究了缩变化的效应和模拟的残余应力对施瓦兹原始 (SP) 格子结构的影响.
主要成果:
- 观察到残余应力积累,边缘的拉力应力可能超过材料的强度.
- 变化的形厚度显著影响到剩余应力演变到一个特定的点,之后应力趋同.
- 合金 (Ti64) 呈现出更高的残余应力,主要是在构造方向.
- 其余应力使TPMS格子结构的有效弹性性能降低了6%-10%,但没有影响其塑性行为.
结论:
- 缩水优化对于管理SLM薄壁结构中的残余应力至关重要.
- 剩余应力是影响增材制造组件,特别是格子结构性能的关键因素.
- 开发的建模框架为预测和减轻复杂几何结构中的残余应力效应提供了洞察力.
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