轻薄型金属反平面撕裂破碎试验研究  

Experimental Investigation of Light Metal on Out-of-plane Tearing and Shredding Test

作　　者：邓莉[1] 刘剑雄[1] 刘俊秀[1] 刘阳[1] 李军[1] 

机构地区：[1]昆明理工大学机电工程学院,昆明650093

出　　处：《机械工程学报》2012年第2期109-114,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50974068)

摘　　要：为解决报废汽车及家用电器的破碎及回收处理问题,利用拉伸试验,获取轻薄型回收金属材料的力学性能参数;在考虑强化效应的基础上,将材料本构关系简化为双线性模型;通过裤形撕裂试验,观察到轻薄型回收金属发生大小相等、方向相反的两次弹塑性弯曲变形,因此裤形撕裂试验过程中外力所做功主要由金属材料的撕裂功和裤腿的弹塑性弯曲功两部分组成;分析研究轻薄型回收金属材料撕裂破碎过程的特点,将单位面积裂纹表面的撕裂比功作为表征材料撕裂性能的特征参数;比较轻薄型回收金属在不同加载速度下的撕裂比功,发现撕裂比功在一定范围内对加载速度的变化不敏感。研究表明,轻薄型金属材料的拉伸断裂比功较相应板材的撕裂比功大一个数量级,这表明撕裂方式更适合于报废汽车及家用电器的破碎加工处理。To find solutions to shredding and recovery processing of end-of-life vehicles and household appliances,by way of tensile test,the mechanical characteristics of the light metal scrap material are obtained.On the basis of strengthening effect,the constitutive relations of materials are reduced to bilinear model.Through the trousers test,light metal scrap produced equal and opposite elastic-plastic bending deformation twice in the tearing process is observed.So in process of trousers tearing test,the total work external force did is mainly composed of specific tearing work and elastic-plastic bending work of trousers legs.The features of light metal scrap materials in tearing and shredding process are investigated,and the specific tearing work per unit area of new crack surface is regarded as a tearing property of light metal.The specific tearing work under different loading rate is compared and that the specific tearing work is not insensitive to loading rate in a certain range is found.The investigation showed that：The tensile specific work of rupture of light metal scrap is one order bigger than specific tearing work,meaning that tearing mode will be better on shredding recovery treatment of end-of-life vehicles and household appliances.

关 键 词：轻薄型金属 回收 裤形撕裂试验 弹塑性变形 撕裂功 

分 类 号：X734[环境科学与工程—环境工程]