计算力学学报2016，Vol.33Issue(2)：209-215,7.DOI:10.7511/jslx201602011
含裂纹梁非线性静动力特性及简化动力学建模
Static and dynamic behaviour of cracked beam and simplified dynamic model
摘要
Abstract
T he influence of cracks on the dynamic behavior of the beam is studied to provide a theoretical basis for crack monitoring .Firstly ,the cracked zone is analyzed by establishing a 2D contact nonlinear finite element model ,and its different compressive and tensile stiffness in static characteristics is clari‐fied .Secondly ,through the analysis of the mechanism model ,it points out that different compressive and tensile stiffness will cause coupling vibration in axial and bending directions .Then ,the coupling vibration phenomena is observed w hen using nonlinear dynamic analysis methods to study its dynamic characteris‐tics .Moreover ,it has an important feature that there is twice frequency component of bending vibration in axial vibration spectrogram .Finally ,a new simplified dynamic model is established ,and its rationality is verified compared with refined finite element analysis .This model converts the contact nonlinear prob‐lem to the material nonlinear problem to avoid complex solving process .关键词
裂纹梁/非线性/耦合振动/简化动力学模型/冲击Key words
cracked beam/nonlinear/coupling vibration/simplified dynamic model/impact分类
数理科学引用本文复制引用
陈岩,王平,余飞,毛鹏程,关振群..含裂纹梁非线性静动力特性及简化动力学建模[J].计算力学学报,2016,33(2):209-215,7.基金项目
国家自然科学基金（11272074）；国家科技重大专项（2011ZX02403）资助项目． （）
