南京工业大学学报（自然科学版）2024，Vol.46Issue(3)：290-299,320,11.DOI:10.3969/j.issn.1671-7627.2024.03.006
压载荷下Ⅰ-Ⅱ复合型中心裂纹板弹塑性屈曲载荷研究
Research on elastic-plastic buckling load of Ⅰ-Ⅱ mixed centrally cracked plate under compressive load
摘要
Abstract
In order to study the bearing capacity of structures with cracks,a model of Ⅰ-Ⅱ mixed centrally cracked plate under compressive load was established using finite element method,and its elastic-plastic buckling load was calculated.The influences of various factors,including relative crack length(a/w),crack inclination angle(θ),plate width(w),plate thickness(t),and boundary conditions,on the elastic-plastic buckling load were explored.For the centrally cracked plate with clamped support on the upper and lower edges,as the crack length and crack inclination angle increased,the wider the crack width and the more sensitive the buckling load of the plate became to the cracks,significantly affecting its load-bearing capacity.The elastic-plastic buckling load increased with plate thickness.However,as the crack inclination angle increased,the thicker the plate and the more significant the decrease in its buckling load.The variations in buckling load for the centrally cracked plate with simple support on the upper and lower edges were basically the same as those with clamped support.However,the buckling load of the latter was significantly greater than that of the former.A regression equation relating the elastic-plastic buckling load to relative crack length and crack inclination angles under different boundary conditions was obtained.It was found that the elastic-plastic buckling load calculated using compressive mechanical properties aligned more closely with the experimental results,and the variations in the experimental buckling load were consistent with the finite element simulation results.These findings provide reference values for evaluating the load capacity of structures with cracks.关键词
压载荷/有限元方法/Ⅰ-Ⅱ复合型裂纹/弹塑性屈曲载荷/上下简支中心裂纹板/上下夹持中心裂纹板Key words
compressive load/finite element method/Ⅰ-Ⅱ mixed crack/elastic-plastic buckling load/centrally cracked plate with simple support on the lower and upper edges/centrally cracked plate with clamped support on the lower and upper edges分类
数理科学引用本文复制引用
李守超,尹倩,王卓吾,贺小华,周昌玉..压载荷下Ⅰ-Ⅱ复合型中心裂纹板弹塑性屈曲载荷研究[J].南京工业大学学报（自然科学版）,2024,46(3):290-299,320,11.基金项目
国家自然科学基金(51975271,51475223) （51975271,51475223）
