摘要
由于制造缺陷和服役过程中的外物冲击,分层损伤是广泛存在于复合材料层合结构中的一种缺陷形式.本文研究含圆形分层损伤碳纤维增强型层合结构在四点弯曲载荷作用下的屈曲力学行为.用三维数字图像相关技术获取屈曲表面的变形场和应变场,并以3自由度的利兹法为基础建立反映含分层损伤层合结构在弯曲载荷作用下屈曲力学行为的一维理论模型.最后,用实验得出的屈曲临界载荷值验证理论模型计算出的屈曲临界载荷值,并得出结论:本文提出的计算分层屈曲临界载荷的简便方法,可以用于屈曲临界载荷的初步估算.
Delamination is the most common form of damage introduced to a laminated composite by manufacturing defects or an impact. This paper reports an investigation of the buckling behaviour of delaminated composites under pure bending. 3D digital image correlation was used to measure the evolution of the deformation of the laminate during bending to structural failure and the resulting full-field displacement maps. Based on the three-degree freedom nonlinear Rayleigh-Ritz formulation, one-dimension analytical model for the buckling behaviour of a delaminated composite laminates under pure bending was presented. Finally, the critical buckling load calculated by analytical model was validated by the experimental result and we can draw a conclusion that the one-dimension analytical model can be used to evaluate the critical buckling load of delaminated composite laminates under pure bending.
出处
《中国科学：技术科学》
EI
CSCD
北大核心
2015年第5期464-470,共7页
Scientia Sinica(Technologica)
基金
国家自然科学基金(批准号:11472187)
国家重点基础研究发展计划(编号:2014CB046805)资助项目
