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宽温域柔性接头弹性件本构模型适用性研究
王才, 史宏斌, 屈转利
西安航天动力技术研究所, 西安 710025
摘要:
针对宽温域丁异戊橡胶弹性件开展了-55、-40、20、65℃下的单轴拉伸试验与剪切试验,研究其在不同温度下本构模型的适用性,验证了本构模型由一种变形对其他变形的预测能力,在此基础上采用有限元方法分析了各模型的计算误差,确定了丁异戊橡胶在不同温度不同应变下所适用的本构模型。结果表明,阶数越高的本构模型预测能力越差,低阶的Neo-Hookean模型预测能力最好,同时在丁异戊橡胶弹性件的有限元计算中,-55~20℃本构模型采用Yeoh模型与三阶五项式模型最好,20~65℃采用Yeoh模型计算精度最高。
关键词:  宽温域  柔性接头  丁异戊橡胶  本构模型
DOI:10.12044/j.issn.1007-2330.2018.05.003
分类号:V435.3
基金项目:
Applicability of Constitutive Models of Flexible Joint Elastomer Under Wide Temperature Range
WANG Cai, SHI Hongbin, QU Zhuanli
Xi'an Institute of Aerospace Solid Propulsion and Technology, Xi'an 710025
Abstract:
Uniaxial tensile test and shear test were operated on wide temperature butyl isoprene rubber under -55,-40,20 and 65℃ to study the applicability of constitutive models.The ability of the constitutive model to predict other deformations was verified.On this basis,the finite element method was used to analyze errors of constitutive models and the applicability of models to butyl isoprene rubber at different temperatures and strains were determined.The results show that the higher order of constitutive model corresponds the worse prediction ability and low-order Neo-Hookean model has best prediction ability. At the same time,Yeoh model and third-order-five-term model are adopted when working temperature is between -55℃ and 20℃,and Yeoh model is chosen when the temperature is between 20℃ and 65℃ in finite element calculation of butyl isoprene rubber in flexible joint.
Key words:  Wide temperature range  Flexible joints  Butyl isoprene rubber  Constitutive model