预紧偏心结构的接触失效分析  

Contact failure analysis of preloaded eccentric structures

作　　者：刘一龙 朱敏 吕松泽 谢海燕 武天洋 李悦 LIU Yilong;ZHU Min;LYU Songze;XIE Haiyan;WU Tianyang;LI Yue(Naval University of Engineering,Wuhan 430000,China;Naval Staff Security Assessment Support Office,Beijing 100000,China)

机构地区：[1]海军工程大学,武汉430000 [2]海参安全评估保障室,北京100000

出　　处：《兵器装备工程学报》2023年第6期261-271,共11页Journal of Ordnance Equipment Engineering

基　　金：装备预研基金项目(41426030107);重点院校与重点学科专业建设项目(430183);院校学科专业重点建设项目(430618)。

摘　　要：针对泡沫橡胶垫层应用于椭球体结构的预紧装配中产生的接触失效现象,开展了垫层的接触分离失效机理和材料本构模型分析,明确了垫层预紧方式的失效分离判定准则和适用于泡沫橡胶材料的本构模型;建立了不同偏心率球体的有限元分析模型,预计算分析了结构的一阶模态频率;施加不同频率幅值的正弦振动载荷,计算并分析垫层接触面接触分离的载荷阈值,得到偏心率、载荷频率和幅值对垫层接触失效的影响。分析结果表明:对同一偏心率的预紧含垫层椭球结构,过质心的集中载荷幅值越大、频率越大,则越容易发生接触分离失效;对不同偏心率的垫层结构施加载荷,偏心率e越大则该结构的临界失效载荷越大。研究结果可以为偏心垫层结构的稳定性研究提供数据支持。In view of the contact failure caused by a foam rubber pad used in the preloaded assembly of the ellipsoid structure,this paper firstly analyzes the failure mechanism of contact separation on the cushion and the material constitutive model,and defines the failure separation criterion of the cushion preloading method and the constitutive model applicable to the foam rubber material.Then,finite element analysis models of spheroids with different eccentricities are established,and the first-order modal frequencies of the structure are precomputed.Finally,sinusoidal vibration loads with different frequency amplitudes are applied to calculate and analyze the load threshold of contact separation on the pad contact surface,and the effects of eccentricity,load frequency and amplitude on pad contact failure are obtained.The simulation results show that,for the preloaded cushion-containing ellipsoid structure of the same eccentricity,the larger the amplitude and frequency of the concentrated load over the center of mass,the more likely the contact separation failure is to occur.When the load is applied to the cushion structure with different eccentricities,the greater the eccentricity e is,and the greater the critical failure load will be.The results can provide data support for the stability study of eccentric cushion structures.

关 键 词：泡沫橡胶 预紧 接触分离 椭球 偏心率 

分 类 号：TJ03[兵器科学与技术—兵器发射理论与技术]