考虑材料塑性损伤的风力机塔筒屈曲稳定性分析  

Buckling Stability Analysis of Wind Turbine Tower Considering Material Plastic Damage

作　　者：周凯明 王法武 程晔 张剑 ZHOU Kaiming;WANG Fawu;CHENG Ye;ZHANG Jian(College of Civil Aviation,Nanjing University of Aeronautics&Astronautics,Nanjing 211100,China)

机构地区：[1]南京航空航天大学民航学院,南京211100

出　　处：《建筑钢结构进展》2023年第5期63-69,共7页Progress in Steel Building Structures

基　　金：国家自然科学基金(51678305)。

摘　　要：考察材料塑性损伤理论在风力机塔筒屈曲分析中的应用,利用有限元软件ABAQUS将塑性损伤引入塔筒模型弹塑性稳定性分析中。通过固有应变法在塔筒模型中引入焊缝,采用模态缺陷法确定几何初始缺陷的分布形式。利用非线性弧长法对塔筒屈曲过程进行数值模拟,得到失稳前后壳体变形情况,并利用材料塑性损伤理论对损伤部位及其发展程度进行了预测。分析结果表明;焊缝对塔筒局部损伤影响明显,焊缝的存在改变了结构的屈曲破坏模式与损伤部位,材料塑性损伤理论可以为预测塔筒结构的薄弱部位、抗风评估及优化设计提供参考。The application of material plastic damage theory in the buckling analysis of wind turbine tower is carried out.Plastic damage is introduced into the elastic-plastic stability analysis of tower model by using the finite element software ABAQUS.The weld is introduced into the tower model by the inherent strain method,and the distribution of initial geometric imperfection is given by a modal defect method.The instability process of tower is numerically simulated by using nonlinear finite element arc length method.The deformations of shell before and after instability are obtained,and the damage position and the development are predicted by using material plastic damage theory.The analysis results show that the influence of local damage of tower is obvious.The existence of weld changes the buckling failure mode and damaging position of structure.The material plastic damage theory can provide a reference for predicting the weak position of tower structure,wind resistance evaluation and optimal design.

关 键 词：塑性损伤 固有应变 初始缺陷 圆柱薄壳 数值模拟 破坏模式 

分 类 号：TM315[电气工程—电机]