基于增材制造的六面体网格加密生成算法  

Hexahedral mesh cryptographic generation algorithm based on additive manufacturing

作　　者：闫立山 刘昊 马雅丽[1] Yan Lishan;Liu Hao;Ma Yali(National Key Laboratory of High Performance Precision Manufacturing,School of Mechanical Engineering,Dalian University of Technology,Liaoning Dalian,116024,China)

机构地区：[1]大连理工大学机械工程学院高性能精密制造全国重点实验室,辽宁大连116024

出　　处：《机械设计与制造工程》2025年第3期15-20,共6页Machine Design and Manufacturing Engineering

摘　　要：针对增材制造过程中由于激光能量密度高度集中而造成有限元热-应力分析熔覆区域出现高度非线性分析特征,需要对熔覆区域进行局部网格加密处理,保证有限元分析结果精度的同时减少整体网格数量,提出一种基于扫掠法的过渡层六面体网格自动生成算法,实现对高度非线性分析区域识别并进行局部网格加密处理。算法对激光定向能量沉积有限元几何模型进行网格疏密区域划分,采用过渡层结构连接不同密度的六面体网格单元解决相容性问题。应用实例表明,该方法对网格划分结果高度可控,可实现全局六面体网格划分及熔覆区域网格加密处理,网格单元分布合理且整体网格质量高。In view of the highly nonlinear analysis characteristics of the finite element thermal-stress analysis cladding area caused by the high concentration of laser energy density in the additive manufacturing process,local mesh encryption treatment of the cladding area is required to ensure the accuracy of the finite element analysis results and reduce the overall number of meshes at the same time.Therefore,this paper proposes a transition layer hexahedral mesh automatic generation algorithm based on sweeping method to realize the identification of highly nonlinear analysis regions and local mesh encryption processing.The algorithm divides the mesh dense area of the laser directed energy deposition finite element geometry,and uses the transition layer structure to connect the hexahedral mesh elements of different densities to solve the compatibility problem.Application examples show that this method is highly controllable for meshing results,realizes global hexahedral meshing and cladding area mesh encryption processing,and has reasonable grid element distribution and high overall mesh quality.

关 键 词：增材制造 有限元网格划分 扫掠法 六面体网格 直接能量沉积模型 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]