摘要
为研究局部材料在不同应力状态下的变形及损伤行为,进行双孔微剪切试验。选取两组试样,试样厚度均为1mm,试样1双孔直径均为2mm,孔间距为0.4mm;试样2与试样1相比,改变其中一个孔径的尺寸,使其为试样1孔径的2倍,并减小两孔之间小桥的间距,使其为试样1间距的一半。选用铝合金6063为研究对象,应用ABAQUS/Explicit结合Gurson损伤模型模拟材料在两种应力状态下的变形及损伤行为。结果表明,Gurson模型较好地预测了试样2的损伤行为,说明试样2在不同于试样1的应力状态下损伤,分析原因,试样2在材料损伤之前三向应力度大于0.4,Gurson模型适合于模拟三向应力度较高的情况。
In order to study the damage behavior within local materials at different stress state, two kinds of doble-hole tests were carried out. The thickness of the specimen is 1 mm. The radius of hole are same in the first specimen. However, the radius of hole are different in the second specimen. One of them is 1 mm, and the other one is 2 mm. Meanwhile,the size of bridge between two hole are different. The former is 0.4 mm, and the later is 0.2 mm.Then the numerical resultes were compared with that of the experiment to verify the validity of Gurson damage models in describing the initiation and propagation of cracks during their evolution.The results show Gurson damage model give good results to the second specimen.Because the stress triaxiality of second specimen greater than 0.4.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第11期73-76,共4页
Transactions of The China Welding Institution
基金
国家重大基础研究前期研究专项(2004CCA04900)
关键词
铝合金
双孔试验
损伤
有限元
aluminium alloy
double-hole test
damae
finite element method
