摘要
偏置抛物面卫星天线反射器由碳纤维预浸料铺制而成,在固化过程中通常会出现热变形、固化收缩变形及机械变形等,且过大的变形会导致反射器反射信号产生偏差。为了有效预测天线反射器在热压罐固化过程中的变形,本文采用线性黏弹性本构模型表征纤维增强复合材料在固化过程中的应力-应变关系。采用顺序热-力耦合分析法,对天线反射器内部温度场、固化度场及位移场的分布进行建模,并对铺层结构及降温速率对天线反射器变形的影响开展研究。结果表明:相较于纯0°铺层结构,正交和准各向同性铺层天线反射器z向变形量减小了51%以上,且降低降温速率有助于提高天线反射器的固化型面变形。
Offset paraboloid antenna reflectors(PSARs)made of carbon fiber prepregs are usually subject to thermal deformation,curing shrinkage deformation and mechanical deformation during the curing process. Excessive deformation will lead to the deviation of transmission signals. In order to effectively predict the deformation of the antenna reflector during the preparation process in a autoclave,a linear viscoelastic constitutive model is adopted to characterize the stress-strain relationship of the fiber reinforced composite material during the curing process. The temperature field,curing degree field and displacement field of the antenna reflector are modeled using the sequential thermal-force coupling analysis method,and the effects of the layup structure and the cooling rate on the deformation of the antenna reflector are analyzed. The analytical results show that the deformation in z-direction of PSARs with orthotropic or semi-isotropic layups is reduced by more than 51% compared with the zero-layup PSARs,and the reduced cooling rate could also help increase the shape accuracy of PSARs.
作者
牛雪娟
刘江雨
李辰阳
NIU Xuejuan;LIU Jiangyu;LI Chenyang(School of Mechanical Engineering,Tiangong University,Tianjin 300387;Advanced Mechatronics Equipment Technology Tianjin Area Major Laboratory,Tianjin 300387)
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2022年第6期65-70,共6页
Aerospace Materials & Technology
基金
国家自然基金面上项目(52175110)。
