风沙冲击作用下涂层与基体界面应力、位移及破坏机理研究  

Study on the coating and matrix interface stress and displacement and failure mechanism of interface under sand affect

作　　者：郝贠洪[1] 朱敏侠[1] 冯玉江[1] 任莹[1] 段国龙[1] 

机构地区：[1]内蒙古工业大学土木工程学院010051呼和浩特

出　　处：《应用力学学报》2015年第2期180-186,348,共7页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金(11162011;51468049);内蒙古自治区自然科学基金(2009 MS0706)

摘　　要：应用界面力学镜像点法及断裂力学理论分析了风沙冲击作用下钢结构表面涂层与基体的界面问题。分析结果表明:冲击角度一定时,界面应力随着冲击速度的增大而增大;冲击速度一定时,界面正应力在冲击点附近较大,在冲击角度为45°时最大;界面切应力在冲击角度为30°时达到最大;冲击角度一定时界面位移随着冲击速度的增大而增大,界面水平位移在冲击角度为30°时最大,冲击速度一定时界面垂直位移随着冲击角度的增大而增大。界面破坏机理是因为界面存在应力集中现象,易发生破坏,切向破坏较为严重。Using interface mechanics image point method and fracture mechanics theory, we analyze the interface problem of steel structure coating and substrate material under sand affect. Results obtained indicate that the interfacial stress increases with the impact velocity, the interfacial normal stress is big near the impact point and reaches the maximum value at 45° impact angle. The interfacial shear stress reaches the maximum value at 30° impact angle. The interfacial displacement increases with the impact velocity and the interfacial level displacement reaches the maximum value at 30° impact angle. The interfacial vertical displacement increases with the impact angle. Failure mechanism of interface is that stress concentration occurs at the interface and the interface is prone to damage, and tangential damage is the most serious.

关 键 词：风沙冲击 钢结构与涂层 界面应力 界面位移 界面破坏机理 

分 类 号：O34[理学—固体力学]