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激光粉末床熔融人工膝关节植入物在不同构建方案下残余应力和变形的固有应变建模
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山东理工大学机械工程学院

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中图分类号:

TG146

基金项目:

山东省自然科学基金 No. ZR2020ME020.


Inherent strain modeling on the residual stress and deformation for laser powder bed fused artificial knee implants under different building schemes
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Affiliation:

School of Mechanical Engineering,Shandong University of Technology

Fund Project:

the Natural Science Foundation of Shandong Province under Grant No. ZR2020ME020.

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    摘要:

    大的残余应力是增材制造(AM)的主要挑战,如激光粉末床熔融(LPBF),因为大的残余应力会导致制造过程本身的变形、开裂甚至失效。合理的设计和选择结构方案对于减小或消除LPBF加工前的残余应力,特别是对于形状复杂的零件,是至关重要的。本文采用基于最小残余应力和变形的修正固有应变模型,对具有不同建筑姿态和支承结构的三种建筑方案进行了有限元分析。以降低建筑整体高度和减少与建筑方向倾斜角较大的支撑结构为准则,在进行LPBF前进行适当的建筑姿态和支护设计,可以有效地减小残余应力和变形。结果表明,在不知道Ti-6Al-4V人工膝关节热物性随温度变化的情况下,利用固有应变模型预测其残余应力和变形,可以获得较好的精度和时间成本。

    Abstract:

    Large residual stress is a major challenge for additive manufacturing (AM), such as laser powder bed fusion (LPBF), since large residual stress will lead to deformation, cracking and even failure of the manufacturing process itself. Proper design and selection of the building scheme are very crucial to minimize or eliminate the residual stress before LPBF operations, especially for complex-shaped parts. In this work, three building schemes with different building postures and supporting structures have been evaluated by finite element analysis (FEM) based on the minimum residual stress and deformation using a modified inherent strain model. Appropriate building posture and supporting design prior to LPBF can effectively reduce the residual stress and deformation with the criterion of decreasing the overall building height and diminishing the supporting structure having a large tilt angle with the building direction. It was suggested that predicting the residual stress and deformation with an acceptable accuracy and time cost can be achieved for the Ti-6Al-4V artificial knee joint without knowing the variation of the thermophysical property with temperature via the inherent strain model.

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李晨晨,任雪彭,潘来涛,申发磊,方晓英.激光粉末床熔融人工膝关节植入物在不同构建方案下残余应力和变形的固有应变建模[J].稀有金属材料与工程,,().[C. C. Li, X. P. Ren, L. T. Pan, F. L. Shen, X. Y. Fang. Inherent strain modeling on the residual stress and deformation for laser powder bed fused artificial knee implants under different building schemes[J]. Rare Metal Materials and Engineering,,().]
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  • 收稿日期:2024-04-26
  • 最后修改日期:2024-07-04
  • 录用日期:2024-07-04
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