Fracture simulation based on EA-cohesive model with natural fracture/decohesion mechanism

详细信息    查看全文

• 作者：Minghua He^a ; ^b ; ^{hmh03@mails.tsinghua.edu.cn"" rel=""nofollow} ; Kegui Xin^a ; ^b ; ^{xkg-dci@tsinghua.edu.cn"" rel=""nofollow} ; Jia Guo^a ; ^b ; ^c ; ^{guoguo42@sina.com"" rel=""nofollow}
• 关键词：Cohesive zone paradigm ; multiscale simulation ; embedded atom method ; Cauchy-Born rule
• 刊名：Procedia Engineering
• 出版年：2011
• 出版时间：2011
• 年：2011
• 卷：10
• 期：Complete
• 页码：254-261
• 全文大小：610 K

文摘

The material strength is dependent on micro structure in which there is no well-recognized idea to predict the complex structureprocess of fracture. For the fundamental simulation of metallic material, the embedded atom method (EAM) is exclusively practical along with satisfactory accuracy. Fracture simulation based on EA-cohesive (Embedded Atom Cohesive) model is presented to demonstrate the effectiveness of natural fracture/decohesion mechanism compared with the prescribed fracture criteria and cohesive law. EA-cohesive model uses the Cauchy-Born rule to form the communication between the macro deformation and the micro structure evolution within the stable material region. The educed constitutive models within EA-cohesive model incorporate both normal and tangential cohesive laws with respect to the surface separation within the unstable material regions naturally (natural fracture/decohesion mechanism hereafter). Fracture simulation results of prototype high strength steel plate are presented to demonstrate the natural capacity of simulating fracture of EA-cohesive model.