摘要
隔膜本构模型的选择直接关系到热隔膜成形仿真的精度。为分析5种超弹性本构模型对不同隔膜材料的适用性,对尼龙隔膜和硅橡胶隔膜2种不同类型的隔膜材料进行不同温度单轴拉伸测试,通过应力-应变曲线、断裂延伸率和弹性模量分析2类材料的性能差异;采用5种超弹性本构模型分别对隔膜材料的单轴拉伸试验数据进行拟合,并将试验数据与隔膜材料的单轴拉伸和热隔膜成形过程仿真数据进行对比。结果表明:硅橡胶隔膜材料具有比尼龙隔膜更大的断裂延伸率,但其弹性模量远小于尼龙隔膜材料。Ogden、Polynomial(N=2)和Marlow模型对尼龙隔膜和硅橡胶隔膜单轴拉伸数据均具有较高的拟合度,Yeoh模型对尼龙隔膜单轴拉伸数据拟合度较低,对硅橡胶隔膜的拟合度较高。Mooney-Rivlin模型无法准确反映大变形状态下超弹性材料的应力-应变关系,对2种隔膜材料的单轴拉伸数据拟合度都较低。以单轴拉伸数据建立的Ogden和Polynomial模型(N=2)模型在热隔膜成形模拟时存在过刚现象,而Marlow模型则具有很高的预测精度。
The selection of the diaphragm constitutive model is directly related to the precision of hot diaphragm forming simulation.In order to analyze the applicability of five hyperelastic constitutive methods to different diaphragm materials,uniaxial tensile tests were carried out on two different types of diaphragm materials(nylon diaphragm and silicone rubber diaphragm)at different temperatures,and the performance differences of the two types of materials were analyzed by stress-strain curves,fracture elongation,and modulus.Five hyperelastic constitutive models were used to fit the data of diaphragm materials in the uniaxial tensile tests,and the data were compared with the simulation data of the uniaxial tension and hot diaphragm forming process of the diaphragm materials.The results indicate that the rubber diaphragm material has a greater fracture elongation than the nylon diaphragm,but its modulus is much smaller than the nylon diaphragm material.The Ogden,Polynomial(N=2),and Marlow models have a high degree of fit for uniaxial tensile data of nylon and rubber diaphragms.However,the Yeoh model has a low degree of fit for uniaxial tensile data of nylon diaphragms but a high degree of fit for rubber diaphragms.Mooney-Rivlin model fails to accurately reflect the stress-strain relationship of hyperelastic material under large deformation,and the degree of fit of uniaxial tensile data of two diaphragm materials is relatively low.The Ogden and Polynomial(N=2)models established based on uniaxial tensile data exhibit excessive stiffness during the simulation of hot diaphragm forming,while the Marlow model has high prediction accuracy.
作者
赵月青
林德志
陈汇
汤家力
陈萍
ZHAO Yueqing;LIN Dezhi;CHEN Hui;TANG Jiali;CHEN Ping(Composites Center,Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324,China)
出处
《北京航空航天大学学报》
北大核心
2025年第6期2041-2050,共10页
Journal of Beijing University of Aeronautics and Astronautics
关键词
隔膜
热隔膜成形
超弹性本构模型
断裂延伸率
有限元仿真
diaphragm
hot diaphragm forming
hyperelastic constitutive model
fracture elongation
finite element simulation
