COD 准则在 40CrNiMo 钢弹塑性 Ⅰ+Ⅱ 型断裂分析中的应用  

Application of COD Criterion to Steel 40CrNiMo ElasticPlastic Fracture Under Mixed Mode Ⅰ+Ⅱ Loading

作　　者：沙江波[1,2] 邓增杰[1,2] 周惠久[1,2] 

机构地区：[1]西安交通大学 [2]广东工业大学材料系

出　　处：《西安交通大学学报》1998年第2期48-52,共5页Journal of Xi'an Jiaotong University

基　　金：国家教委博士点基金

摘　　要：以Ｒｉｃｅ的裂尖钝化模型为基础，定义了Ⅰ＋Ⅱ型载荷下裂纹张开位移（简称ＣＯＤ）δ，裂纹尖端Ⅰ型张开位移（简称ＣＴＯＤ）δｔ和Ⅱ型滑开位移（简称ＣＴＳＤ）δｓ，对４０ＣｒＮｉＭｏ钢Ⅰ＋Ⅱ型弹塑性断裂行为进行了ＣＯＤ分析，讨论了复合型载荷下的ＣＯＤ与Ｊ积分的关系．结果表明：１）随Ⅱ型分量增加，４０ＣｒＮｉＭｏ启裂的δｉ值降低，纯Ⅰ型的δｉ是纯Ⅱ型δｉ值的２．５倍；２）不同复合载荷下的δ、δｔ、δｓ与Ｊ积分均满足线性关系．Based on the blunting model proposed by Rice, the crack opening displacement(COD)δ,the crack tip opening displacement(CTOD)δt and the crack tip slipping displacement(CTSD)δs under mixed Ⅰ+Ⅱ mode loading were defined, where(CTOD)δt and(CTSD)δs are the mode Ⅰ and mode Ⅱ components of(COD)δ respectively. The δ parameter was used to analyse the behavior of mixed Ⅰ+Ⅱ elasticplastic fracture of 40CrNiMo steel, and the relationships between δ and Jintegral for different mixed ratios were also discussed. The results show that: 1) the initiation of δi of 40CrNiMo decreases with an increasing of mode Ⅱ component, and the δi of pure mode Ⅰ loading is 2.5 times of δi of pure mode Ⅱloading ; 2) the δ、δt、δs and Jintegral for different mixed ratios satisfy the linear relations.

关 键 词：复合型 COD 弹塑性断裂 J积分 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]