Damage model of crack growth and instability

✍ Scribed by Jan Janson

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 771 KB
• Volume: 10
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(78)90034-6

✦ Synopsis

The interaction between a macroscopic crack and microscopic, continuously distributed, damage is studied both for time-independent and time-dependent damage formation. This damage is a measure of an assumed continuous deterioration of the material. A thin cracked sheet loaded in mode I is considered, using a Dugdale crack model. In this model most deformation and damage is assumed to be concentrated to narrow regions ahead of the crack tips, where an approximation for the stresses is made. For the time-independent case, the critical external load to cause unstable crack propagation is found as a function of crack length. For the time-dependent case, the crack length as a function of time, and thereby the time to reach a certain critical crack length, is found for different external stresses.