(Ⅰ+Ⅱ)型载荷下LY12的J积分与COD的关系  

RELATIONSHIP BETWEEN J-INTEGRAL AND COD UNDER MIXED Ⅰ+ⅡMODE LOADING IN LY12

作　　者：沙江波[1] 孙军[2] 邓增杰[2] 周惠久[2] 

机构地区：[1]广东工业大学材料科学工程系,广州市510090 [2]西安交通大学

出　　处：《材料研究学报》1998年第1期57-63,共7页Chinese Journal of Materials Research

基　　金：国家教委博士点基金

摘　　要：应用大应变有限元方法和断裂实验研究了铝合金LY12在（Ⅰ＋Ⅱ）型载荷下弹塑性断裂参量J积分与COD随外载荷变化规律及相互关系，结果表明：1）（Ⅰ＋Ⅱ）型下LY12的J积分和COD关系为：J＝dn·σ0·DⅠ＋ds·T0·DⅡ；J＝d·σ0．2·D．其中dn、ds、d为系数，随复合比而变，σ0、T0为裂尖屈服带上正应力和切应力、DⅠ和DⅡ为COD（D）的Ⅰ型和Ⅱ型分量；2）随Ⅱ型分量增加。This paper dealt with the J-integral and COD versus loading level and the relationship between J-integral and COD under mixed modeⅠ+Ⅱ loading in aluminum alloy LY12 by finite element method and fracture test. The results show that: 1)the J-integral and the COD under Ⅰ+ Ⅱloading have the relations of J=dn·σ0·DⅠ+ds·T0' DⅡ, J=d·σ0.2·D where dn. ds and d are coefficients, with which varied materials and mixed ratios,σ0'T0 are tensile and shear stress in yield Stripe at mixed crack tip, and DⅠ、 DⅡ are the mode Ⅰ and mode Ⅱ components of COD, respectively; 2)with an increasing of mode Ⅱ loading, the initiation J-integral and COD values increase.

关 键 词：J积分 COD 铝合金 载荷 弹塑性断裂 

分 类 号：TG146.21[一般工业技术—材料科学与工程]