摘要
薄壁箱梁具有壳体和梁的特性,广泛应用于实际工程中。弯曲载荷作用下的薄壁箱梁具有一些复杂的裂纹,如十字型裂纹和周期T型裂纹,其实际上是典型的三维裂纹问题,具有多个不同的奇异应力场和应力强度因子。基于J2积分和材料力学中的弯曲理论,提出了一种简单且实用的确定不同应力场对应应力强度因子的方法。同时也给出了有限元数值解与本文解的比较,两者吻合较好。
The thin-walled box girder possess both shell and beam characteristics,which are widely used in practical engineering.The thin-walled box girder under bending with some complex cracks,such as cross-shaped cracks and periodic T-shaped cracks,which are actually typical three-dimensional crack problems with many different singular stress fields and stress intensity factors.In the present article,a very simple and practical technique based on bending theory in material mechanics and J2 integral is proposed to determine the stress intensity factors.At the same time,the comparison between the finite element numerical solution and the solution is given.And the results from present method are shown to agree well with finite element method.
作者
李龙
邓友生
孟丽青
彭程谱
刘俊聪
LI Long;DENG YouSheng;MENG LiQing;PENG ChengPu;LIU JunCong(Department of Civil Engineering,Xi'an Traffic Engineering Institute,Xi'an 710300,China;Department of Architecture and Civil Engineering,Xi'an University of Science and Technology,Xi'an 710054,China)
出处
《机械强度》
CAS
CSCD
北大核心
2021年第1期211-216,共6页
Journal of Mechanical Strength
基金
国家自然科学基金项目(41672308,51878554)
陕西省自然科学基础研究计划重点项目(2018JZ5012)资助。
关键词
薄壁箱梁
应力强度因子
裂纹
守恒定律
有限元
Thin-walled box girder
Stress intensity factor
Crack
Conservation law
Finite element
