Isogeometric Topology Optimization of Self-supported Structures Considering Local Overheating Constraint

doi:10.3901/JME.2024.11.041

Abstract

Abstract: The isogeometric topology optimization method realizes the unity of structure geometry, analysis and optimization model, and has important application potential in the field of structure optimization. The structure of topology optimization design is complex and usually needs to be processed by additive manufacturing. In order to ensure the manufacturability of parts, its structural characteristics must meet specific geometric and technological conditions to ensure its manufacturability. Therefore, it is particularly important to consider the manufacturing process constraints in the optimization design stage. An isogeometric topology optimization method such as self-supported structure with local overheating constraint is proposed to solve the common local overheating phenomenon and the requirement of overhang angle in metal additive manufacturing. The variable density method based on isogeometric analysis is used, and the concept of printable density was introduced to filter the elements that did not meet the printing requirements, so as to realize the self-support of the structure. The steady-state thermal process simulation model is used to approximate the local overheating degree of the structure, and it is introduced into the isogeometric topology optimization model to constrain it. Numerical examples and simulation results show that compared with the traditional isogeometric topology optimization method and the isogeometric topology optimization method which only considers the self-supporting characteristics, the proposed method can effectively alleviate the local overheating phenomenon of the structure in additive manufacturing on the basis of satisfying the self-supporting characteristics, hence reducing the thermal deformation of the structure and improving the dimensional accuracy.

Key words: isogeometric topology optimization, overhang angle constraint, local overheating constraint, additive manufacturing

CLC Number:

TG156

ZONG Zikai, XIAO Mi, ZHOU Mian, SHA Wei, GAO Liang. Isogeometric Topology Optimization of Self-supported Structures Considering Local Overheating Constraint[J]. Journal of Mechanical Engineering, 2024, 60(11): 41-52.

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