摘要
针对CVI工艺下复合材料典型铆接板,提出一种适合复杂模型动力学分析的建模方法:采用Bush和RBE2的组合单元模拟铆钉连接,将板间的弱非线性接触力转化为接触刚度,建立该复合材料铆接板的有限元模型。同时,基于有限元-间接边界元法推导了考虑接触力的声固耦合动力学方程,开展了该复合材料铆接板在随机噪声激励下的声固耦合分析,并探讨界面接触对声固耦合系统固有特性和动响应的影响。研究结果表明,界面接触模型比界面刚接模型更为准确;刚接模型会增大复合材料铆接板连接界面的局部刚度,使得结构的固有频率偏高,响应峰值向高频处移动;考虑接触对结构的加速度响应影响较大,对应力响应影响较小。
Focusing on a typical composite jointed panel in the CVI technology, a finite element model was built in which the riveted joints were simulated by the combined elements of Bush and RBE2 elements, the nonlinear contact forces were transformed to contact stiffness; Utilizing the equivalent linearization method, the equation of motion of the structural-acoustic coupling system was formulated by the FEM-IBEM approach. Structural-acoustic coupling analysis under noise excitation was further conducted and the influence of interfacial contacts on the natural characteristic and dynamic response of this structural-acoustic coupling system was discussed. Results show that the interfacial contact model of the joints is more accurate than the rigid model. The rigid model increa- ses the local interfacial stiffness of the composite jointed panel which will further lead to the increase of the system＇s nature frequen- cies. The peaks in frequency domain of the dynamic response of the system with rigid models tend to move towards the higher fre- quency domain. Interfacial contact has significant influence on structural acceleration but weak effect on stress.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2017年第2期214-220,共7页
Journal of Solid Rocket Technology
基金
国家自然科学基金(11572086&11402052)
教育部新世纪优秀人才支持计划(NCET-11-0086)
江苏省自然科学基金(BK20140616)
江苏省普通高校研究生科研创新计划资助项目(CXZZ13_0084)
关键词
铆钉连接
界面接触
复合材料
有限元-边界元
声固耦合
joint
interfacial contacts
composite structure
FEM-BEM
structural acoustic coupling
