Fatigue Life Prediction of Flexible Lattice Structures Prepared by Digital Light Process

doi:10.3969/j.issn.1004-132X.2023.21.014

Abstract

Abstract: Based on Brown-Miller model for complex lattice structures， a fatigue life prediction method was proposed to solve the reliability problem of their damping capacity. The fatigue life for lattice structures of 3 cell arrays was predicted by numerical simulation and fatigue tests. The influence of unit cells configuration and relative density on power-law parameters was analyzed indepth， and a prediction model between relative density and fatigue strength was constructed. The results indicate that the S-N curves of lattice structures conform to a power-law relationship. The power-law coefficient is influenced by both unit cell configurations and relative density， while the power-law exponent is dependent on the unit cell configuration and unaffected by relative density.

Key words: S-N curve, fatigue life, lattice structure, flexible photosensitive resin, digital light process

摘要： 针对复杂点阵结构在使用中缓冲减振能力的可靠性问题，提出一种基于Brown-Miller模型的点阵结构疲劳寿命预测方法。以3种单胞周期性扩展的点阵结构为研究对象，通过数值模拟和疲劳试验预测了点阵结构疲劳寿命；深入分析了单胞构型和相对密度对幂律参数的影响，构建了相对密度与疲劳强度的预测模型。研究结果表明，点阵结构的S-N曲线高度符合幂律关系；幂律系数受单胞构型与相对密度共同作用，但指数不受相对密度的影响，而依赖于单胞构型。

关键词: S-N曲线, 疲劳寿命, 点阵结构, 柔性光敏树脂, 数字光处理

CLC Number:

WANG Wei, JI Xiaogang, FANG Chuang, NIU Guofa. Fatigue Life Prediction of Flexible Lattice Structures Prepared by Digital Light Process[J]. China Mechanical Engineering, 2023, 34(21): 2637-2645.

王炜, 纪小刚, 方创, 牛国法. 数字光处理制备的柔性点阵结构疲劳寿命预测[J]. 中国机械工程, 2023, 34(21): 2637-2645.

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