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《工程(英文)》 >> 2022年 第15卷 第8期 doi: 10.1016/j.eng.2021.03.032

一种新型激光打印压缩诱导扭转柔顺机构的成型过程和力学变形行为

a College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
b Jiangsu Engineering Laboratory for Laser Additive Manufacturing of High-Performance Metallic Components, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
c State IJR Center of Aerospace Design and Additive Manufacturing, MIIT Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design, Northwestern Polytechnical University, Xi’an 710072, China
d NPU–QMUL Joint Research Institute of Advanced Materials and Structure, Northwestern Polytechnical University, Xi’an 710072, China

收稿日期: 2020-02-27 修回日期: 2022-03-15 录用日期: 2022-03-17 发布日期: 2022-06-15

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摘要

本文采用激光粉末床熔融(LPBF)技术成型了一种基于自由约束拓扑(FACT)方法设计的新型压缩诱导扭转(CIT)柔顺机构。研究了LPBF 打印参数对激光打印CIT 柔顺机构成型性和压缩性能的影响。在375~450 W的优化激光功率范围内,样品的致密化水平均保持在98%以上,所获得的LPBF制造的CIT柔顺机构的相对密度随施加激光功率的变化不明显。增加激光功率有利于消除CIT 柔顺机构斜杆内的残余冶金孔隙。在450 W的激光功率下实现了0.2%的最高尺寸精度和20 μm的最低表面粗糙度。LPBF成型CIT柔顺机构的变形行为表现为四个典型阶段:弹性阶段、非均匀塑性变形阶段、强度破坏阶段和变形破坏阶段(或不稳定变形阶段)。采用450 W激光功率最优成形的CIT 柔顺机构在破坏前的累积压缩应变可达20%,展现了较大的变形能力。通过有限元模拟和实验验证相结合的方法,研究了CIT 柔顺机构的扭转行为和力学性能。在LPBF成型CIT柔顺机构的应变达到15%之前实现了轴向压缩应变与旋转角度之间的近似线性关系。

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