易龙, 彭云, 韩博文, 朱利媛, 王晓君. 基于APDL的圆截面舱段楔块连接结构全接触分析技术研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(1): 104-108. DOI: 10.3969/j.issn.1001-4926.2017.01.017
引用本文: 易龙, 彭云, 韩博文, 朱利媛, 王晓君. 基于APDL的圆截面舱段楔块连接结构全接触分析技术研究[J]. 南昌航空大学学报(自然科学版), 2017, 31(1): 104-108. DOI: 10.3969/j.issn.1001-4926.2017.01.017
YI Long, PENG Yun, HAN Bo-Wen, ZHU Li-Yuan, WANG Xiao-Jun. Research of Contact Analysis for Wedged Link Based on APDL[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(1): 104-108. DOI: 10.3969/j.issn.1001-4926.2017.01.017
Citation: YI Long, PENG Yun, HAN Bo-Wen, ZHU Li-Yuan, WANG Xiao-Jun. Research of Contact Analysis for Wedged Link Based on APDL[J]. Journal of nanchang hangkong university(Natural science edition), 2017, 31(1): 104-108. DOI: 10.3969/j.issn.1001-4926.2017.01.017

基于APDL的圆截面舱段楔块连接结构全接触分析技术研究

Research of Contact Analysis for Wedged Link Based on APDL

  • 摘要: 楔块连接以其连接可靠、装卸方便、空间利用率高等优点,广泛应用于圆截面舱段对接结构。楔块强度校核一般参照键联连接工程校核方法,但是需要先获取楔块传递载荷。采用有限元方法可以模拟楔块与舱体之间的复杂传力关系,更为全面地获得整体结构应力分布,但是由于接触面多,计算收敛性差。基于ANSYS参数化设计语言(APDL)开发了典型圆截面舱段楔块连接结构全接触分析命令流,对结构尺寸、公差配合间隙、预紧力等进行了详细设计。根据理论分析结果和工程应用经验,楔块连接结构全接触分析模型将正楔、反楔和直楔作为整体进行建模,而通过热载荷模拟楔块初始预紧力;在楔块、内舱体和外舱体之间建立两两接触关系,真实地反映了结构传力状态。在各独立楔块之间建立弹性连接结构,对弹性连接结构施加附加位移约束,有效解决了计算发散问题;同时通过调节弹性连接结构刚度,将附加约束对本体结构的影响减小到工程可接受程度。

     

    Abstract: Wedged link is widely applied to circular cabin section linking structure for the advantages such as structure reliability, convenient installation and removal as well as high space utilization ratio. Generally, wedge block strength analysis use engineering method. However, the transfer load of wedge block must be obtained firstly, which is usually difficult. The adoption of finite element method makes it possible to simulate the complex load transferring relationship between wedge block and cabin body, thus obtaining a more comprehensive integral structural stress distribution. Nevertheless, the computation convergence is not satisfactory due to a number of contact surfaces. On the basis of ANSYS Parameter Design Language (APDL), the full contact analysis command stream is developed to carry out the detailed designs for structural size, tolerance fit clearance and pre-stress. In accordance with the theoretical analysis and engineering application experience, the model is established by taking the uprising wedge block, inverse wedge block and straight wedge block as an integral, meanwhile the initial pre-stress is simulated through the thermal load, which enables it to build the contact among the wedge block, internal cabin body and external cabin body, so as to truthfully reflect the structural load transferring status. The building of elastic connection structure between different independent wedge blocks and the adding of externally imposed displacement restraint on the elastic connection structure effectively solve the problem of computation divergence. In the meantime, the impact of additional restraint on the mechanical structure can be reduced to the acceptable level for engineering by adjusting the stiffness of elastic connection structure.

     

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