|
|||||
|
|
The effect of specimen thickness on the experimental and finite element characterization of CTOD in extra deep drawn steel sheets |
|
| Authors: | D M Kulkarni Ravi Prakash Pravin Talan A N Kumar |
| Affiliation: | (1) Mechanical Engineering Group, Educational Hardware Division, Birla Institute of Technology and Science, 333 031 Pilani, India;(2) Research and Consultancy Division, Birla Institute of Technology and Science, 333 031 Pilani, India;(3) Applied Mechanics, Indian Institute of Technology, 110 016 New Delhi, India |
| Abstract: | Recent experimental results by us have indicated that the load-drop technique can serve as a valid fracture criterion for predicting elastic-plastic fracture in extra deep drawn (EDD) steel sheets or in predominantly plane stress conditions. The purpose of this investigation is to examine the validity of aJ-integral as a fracture parameter and theJ-CTOD relation for the determination of critical CTOD in predominantly plane stress fracture (CTOD-crack tip opening displacement). Fracture tests were performed and experimental results were generated on fracture behaviour of EDD (0·06%C) steel sheets with CT specimens and using ‘load-drop’ as a fracture criterion. Critical CTOD was determined by using theJ-CTOD relation in addition to several existing techniques. A full 3-D finite element model was formulated to verify the critical load, critical CTOD and plastic-zone size. The critical CTOD was shown to increase with increasing specimen thickness and appeared to be approaching a higher limiting value. The characteristic features of predominantly plane stress fracture or general yielding fracture mechanics are summarized in conclusion |
| Keywords: | Extra deep drawn steel sheets critical CTOD J-integral fracture criterion general yielding fracture mechanics |
| 本文献已被 SpringerLink 等数据库收录！ | |