基于时间硬化理论的聚乳酸结构件尺寸稳定性分析*

doi:10.19562/j.chinasae.qcgc.2019.06.015

Abstract

Abstract: The battery tray of polylactic acid in an electric vehicle is designed based on equal stiffness theory. Through topology optimization the maximum stress and displacement of battery tray reduce by 26.5% and 19.7% respectively while its mass drops by 8.5%. With consideration of the creep characteristics of nonmetallic materials, the creep model of the material is established based on the theory of time hardening, and a finite element analysis is conducted to get the creep strain of battery tray under long-term loading condition. The results show that polylactic acid parts meet the design requirements of product in terms of dimension stability, verifying the feasibility of the application of polylactic acid to automotive products.

Key words: polylactic acid, topology optimization, creep, time hardening theory, finite element analysis

Ma Fangwu, Han Lu, Chen Shixian, Pu Yongfeng, Shen Liang. Dimensional Stability Analysis of Polylactic-acid StructuralParts Based on Time Hardening Theory[J].Automotive Engineering, 2019, 41(6): 711-716.

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Dimensional Stability Analysis of Polylactic-acid StructuralParts Based on Time Hardening Theory

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