Applications of dynamic fracture mechanics for the prediction of crack arrest in engineering structures

✍ Scribed by M. F. Kanninen

• Publisher: Springer Netherlands
• Year: 1985
• Tongue: English
• Weight: 976 KB
• Volume: 27
• Category: Article
• ISSN: 1573-2673
• DOI: 10.1007/bf00017974

✦ Synopsis

The compatibility of the static and dynamic approaches to crack propagation and arrest is investigated. For clarity, the term "kinetic" is introduced for analyses that focus on the entire crack initiation/propagation/arrest process -as opposed to static analyses which consider only the end points -as dynamic effects are not always significant in a crack run/arrest event. The importance of integrating experimental and computational work in this field is also discussed and a differentiation is given between the ways in which this can be done. An example computation on a thermal shock problem where dynamic effects are minimal, i.e., where the static and kinetic approaches are nearly the same, and a computation for a DCB specimen where significant differences occur between the two approaches are described. It is concluded that the static and kinetic approaches are entirely compatible as long as reflected stress waves do not reach the crack tip prior to crack arrest. But, when this is not the case, it is the kinetic approach that must be used. Similarly, when inelastic effects are important, only the kinetic approach can properly admit them.