Ⅰ+Ⅱ 型复合型弹塑性断口形貌的分形分析  

FRACTAL ANALYSIS OF ELASTIC PLASTIC FRACTURE SURFACE UNDER MIXED MODE(Ⅰ+Ⅱ) LOADING

作　　者：沙江波[1,2] 邓增杰[1,2] 周惠久 

机构地区：[1]广东工业大学材料系 [2]西安交通大学材料科学与工程学院

出　　处：《机械强度》1997年第3期45-47,共3页Journal of Mechanical Strength

基　　金：国家教委博士点基金

摘　　要：应用二次电子扫描线法研究了不同Ⅰ＋Ⅱ型复合比下铝合金ＬＹ１２的断口形貌及分形维数，讨论了分形维教与复合比及复合断裂韧度ＪＭＣ的关系。结果表明，①随Ⅱ型分量的增加，裂纹启裂断口形貌逐渐由纯Ⅰ型的等轴韧窝形貌向纯Ⅱ型的抛物状韧窝形貌过渡。②复合比ＫⅠ／ＫⅡ与分形维数成反比。The elastic plastic fracture surface and its fractal dimension in LY12 under mixed mode (Ⅰ+Ⅱ) loading were studied by second electron scanning method.The relationships between fractal dimension D F and mixed ratios K Ⅰ/K Ⅱ,D F and mixed fracture toughness J MC were discussed.It′s point out that:1)With the increasing of mode Ⅱ component,the fracture surface vary from dimple with equalaxis to parabolic dimple around smooth zone.2)The fractal dimension decreases with an increasing of mixed ratio K Ⅰ/K Ⅱ .3)The fractal dimension and mixed fracture toughness J MC of LY12 satisfy the linear relation.

关 键 词：复合比 断口 分形维数 断裂分析 弹塑性断裂 

分 类 号：O346.1[理学—固体力学]