摘要
采用考虑几何和材料双重非线性的弧长法分析了受初始几何缺陷影响的加筋壁板在轴压载荷作用下的后屈曲破坏过程。在分析中探讨了初始几何缺陷的大小及形态对加筋壁板极限承载能力和破坏模式的影响。计算结果表明,当初始缺陷的最大位移值超过蒙皮厚度的0.1倍时,将影响结构的承载性能。小于蒙皮厚度的0.1倍时,初始缺陷的形态和大小对结构的承载能力不产生明显影响,但影响结构的最终破坏模式。在后屈曲分析中可以以线性屈曲特征值法计算得到的一阶屈曲模态为初始缺陷的模式,初始缺陷最大位移值取蒙皮0.005~0.1倍之间。
Nonlinear finite element analysis（FEA） based on the arc-length method is applied to predict the post-buckling behavior of stiffened panel under compress loads,in which the initial geometrical imperfection is considered.The influence of the shape and size of the initial geometrical imperfectionon structural carrying capacity and failure mode is studied.The results showit can lead to a significant reduction of failure load when the imperfection size larger than 10% thickness of the skin.Otherwise,the change of the imperfection shape and size has little influence on structural carrying capacity,while the failure mode would be changed.In post-buckling analysis,the buckling mode gained by linear buckling analysis can be defined as the imperfection shape,and the quantity can be chosen within 0.5% up to10% thickness of the skin.
出处
《航空计算技术》
2017年第1期90-93,共4页
Aeronautical Computing Technique
基金
民机科研项目资助(MIZ-2015-F-028)
关键词
加筋结构
初始几何缺陷
承载能力
破坏模式
stiffened structure
initial geometrical imperfection
carrying capacity
failure mode
