Paper Title:
Cohesive Zone Model for Crack Propagation in a Viscoplastic Polycrystal Material at Elevated Temperature
  Abstract

This study looks at the crack propagation characteristics based on the cohesive zone model (CZM), which is implemented as a user defined element within FE system ABAQUS. A planar crystal model is applied to the polycrystalline material at elevated temperature in which grain boundary regions are included. From the point of energy, interactions between the cohesive fracture process zones and matrix material are studied. It’s shown that the material parameter such as strain rate sensitivity of grain interior and grain boundary strongly influences the plastic and cohesive energy dissipation mechanisms. The higher the strain rate sensitivity is, the larger amount of the external work will be transformed into plastic dissipation energy than into cohesive energy which could delay the rupturing of cohesive zone. By comparisons, when strain rate sensitivity decreases, plastic dissipation energy is reduced and the cohesive dissipation energy increases. In this case, the cohesive zones fracture more quickly. In addition to the matrix material parameter, influence of cohesive strength and critical displacement in CZM on stress triaxiality at grain interior and grain boundary regions are also investigated. It’s shown that enhancing cohesive zones ductility could improve matrix materials resistance to void damage.

  Info
Periodical
Key Engineering Materials (Volumes 306-308)
Edited by
Ichsan Setya Putra and Djoko Suharto
Pages
187-192
DOI
10.4028/www.scientific.net/KEM.306-308.187
Citation
Y. Q. Wu, H. J. Shi, "Cohesive Zone Model for Crack Propagation in a Viscoplastic Polycrystal Material at Elevated Temperature", Key Engineering Materials, Vols. 306-308, pp. 187-192, 2006
Online since
March 2006
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Xiao Ying Liu, Xiao Xiang Yang, Xiu Rong Wang
Abstract:Presented herein is a finite element investigation into the damage mechanism of the adhesive interface of the rubber-steel bimaterial. The...
865
Authors: Hai Bin Yu, Chuan Zhen Huang, Han Lian Liu, Bin Zou, Hong Tao Zhu, Jun Wang
Chapter 2: Simulation of Machining Processes
Abstract:A 3D finite element polycrystalline microstructure model of ceramic tool materials is presented. Quasi-static crack propagation is modeled...
119
Authors: Bo Han, Yu Tao Ju, Chang Sheng Zhou
Chapter 3: Modeling, Analysis and Simulation of Manufacturing Processes
Abstract:The fracture toughness of HTPB propellant has a significant rate effect. In order to establish a fracture criterion considering rate effect...
745
Authors: Ran Liu, Hui Huang, Jia Ju Liu, Wei Wang, Li Rong, Zuo Ren Nie
Chapter 2: Numerical Simulation, Calculation and Design in Materials Science
Abstract:Plasticity zone at crack tip of aluminum alloy with fcc structure is investigated in order to analyze the effect of crystal orientation to...
328