硅橡胶复合材料的多轴疲劳寿命计算及优化设计

Multiaxial fatigue life calculation and optimal design of silicone rubber composites

基于裂纹扩展理论,采用Python语言开发了橡胶的多轴疲劳寿命算法并进行了试验验证,并计算了硅橡胶哑铃形单轴拉伸试样、平面拉伸试样及十字形等双轴拉伸试样的疲劳寿命;为兼顾硅橡胶复合材料的发电性能和疲劳寿命,采用总能量密度(PI)来评估复合材料的综合性能。结果表明,通过PI评估发现,等双轴拉伸下应变能密度(W)最大,开裂能密度与W的比值最小,硅橡胶在等双轴拉伸下可能具有最佳的综合性能。

Based on the crack propagation theory,the multiaxial fatigue life algorithm of rubber was developed using Python language and verified by experiments.The fatigue lives of silicone rubber dumbbell uniaxial tensile specimens,plane tensile specimens and cross biaxial tensile specimens were calculated.In order to take into account the power generation performance and fatigue life of silicone rubber composites,the total energy density(PI)was used to evaluate the comprehensive properties of the composites.The results showed that through the PI evaluation,the strain energy density(W)was the largest and the ratio of cracking energy density to W was the smallest under equibiaxial tension.Silicone rubber may have the best comprehensive properties under equibiaxial tension.