基于内聚力界面单元的变厚度双悬臂梁裂纹扩展研究  

Research on Crack Growth of Double Cantilever Beam with Variable Thickness Based on Cohesive Interface Element

作　　者：夏晔[1] 彭惠芬[1] 王玥[1] 

机构地区：[1]东北石油大学机械科学与工程学院,大庆163318

出　　处：《价值工程》2016年第21期77-78,共2页Value Engineering

基　　金：黑龙江省教育厅科技项目-碳纤维树脂基复合材料界面裂纹扩展机理研究(12541091)

摘　　要：基于虚拟裂纹闭合技术研究了等厚双悬臂梁同步增厚和非等厚双悬臂梁上下梁不同厚度比条件下,上下梁变厚度对双悬臂梁界面裂纹扩展的影响。结果表明,非等厚双悬臂梁上下梁厚度比越悬殊,其裂纹扩展能量释放率越小,界面裂纹越易于扩展。而等厚双悬臂梁界面裂纹扩展能量释放率较大,且随厚度变化不大,结构较为稳定。Based on virtual crack closure technique （VCCT）, the impact of changing of upper and lower beam thickness on double cantilever beam （DCB） interface crack growth was studied under uniform thickness DCB gradually thickening and non-same-thickness DCB with different thickness ratios of upper and lower beams conditions. The results show that the greater thickness ratio of upper and lower beams of non-same-thickness DCB, the smaller energy release rate （ERR） of interface crack growth, and interface crack is easy to grow. ERR of interface crack growth of uniform thickness DCB is larger, and it does not change much with changing of the thickness, structure of DCB is more stable.

关 键 词：能量释放率 内聚力模型 虚拟裂纹闭合技术 双悬臂梁 裂纹扩展 

分 类 号：O346.1[理学—固体力学]