Elastic-plastic crack-tip-field numerical analysis integrated with moire interferometry

✍ Scribed by N. T. Sivaneri; Y. P. Xie; B. S.-J. Kang

• Book ID: 104619780
• Publisher: Springer Netherlands
• Year: 1991
• Tongue: English
• Weight: 647 KB
• Volume: 49
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00042197

✦ Synopsis

A novel method of integrating displacement field measurements from high-sensitive moire interferometry with the finite element method is introduced for the elastic plastic fracture mechanics problem. The measured displacements normal to the crack in a fatigue-precracked specimen are input to a finite element model along a near-field boundary. In this paper the analysis is done for a power-law strain hardening material. The near-field region is discretized using 8-noded isoparametric quadrilateral elements. A validation procedure indicates that just the u,-displacement (normal to the crack) as input is sufficient for an edge-cracked specimen whereas a centercracked specimen requires both u,.-and u,.-displacement inputs. Results are obtained in the form of J-integral evaluations, HRR fields, and plastic zones. A significant CPU time saving is achieved when compared with the load-input case. Also the results indicate the existence of HRR field under large scale yielding.