摘要
为了计算柔性喷管摆动过程中非线性弹性和粘性行为,针对柔性接头用橡胶材料进行了试验与数值计算研究。进行了多次加载、循环加载以及不同速率和不同应变水平加载的力学试验;将三阶Ogden模型和Boyce-Bergström迟滞模型结合的超-粘弹性模型应用在试验件的有限元仿真中,利用模拟退火算法对模型参数进行了优化。试验结果表明,应变水平对迟滞曲线的影响比应变速率的影响更为显著,在剪切应变小于1.5的范围内,前者的变化造成了迟滞环面积363.465%的变化,而后者变化仅造成了迟滞环面积20.51%的变化。计算结果表明,所采用的超-粘弹性模型能够表征橡胶的迟滞特性和速率相关性,计算迟滞应力-应变曲线的平均误差为9.80%,相关的建模和参数识别方法可以指导柔性接头摆动过程中的动态力学计算。
In order to calculate the nonlinear elastic and viscous behavior of the flexible nozzle during the swing process,the u-niaxial tension test and simple shear test were carried out on the rubber for flexible joint.The mechanical tests of multiple loading,cyclic loading and loading at different rates and different strain levels were conducted;a hyperelastic-viscoelastic constitutive model combined three-order Ogden model with Boyce-Bergstrom hysteresis model was applied to finite element simulation in Abaqus,whose parameters were optimized by heuristic algorithm using Python code.The test results show that the effect of strain level on the hyster-esis curve is more significant than that of strain rate.In the range of shear strain less than 1.5,the change of strain level results in the 363.465%change of the hysteresis loop area,while the change of strain rate cause only the 20.51%change of the hysteresis loop ar-ea.The numerical simulation result shows that the H-V model can characterize hysteresis characters and rate correlation of the rub-ber.The average error of calculating the hysteretic stress-strain curve is 9.80%.Therefore,the relevant modeling and parameter iden-tification methods can guide the dynamic mechanical calculation in the swing process of flexible joint.
作者
李定机
毛成立
郑庆
童悦
马超
LI Dingji;MAO Chengli;ZHENG Qing;TONG Yue;MA Chao(Shanghai Space Propulsion Technology Research Institute,Shanghai201109,China;Shanghai Plastic Research Institute Co.,Ltd.,Shanghai201702,China)
出处
《固体火箭技术》
CAS
CSCD
北大核心
2022年第3期407-415,共9页
Journal of Solid Rocket Technology
关键词
柔性喷管
柔性接头
动态力学分析
超-粘弹性本构模型
flexible nozzle
flexible joint
dynamic mechanical analysis
hyperelasic-viscoelastic constitutive model
