DETERMINATION OF FAILURE CRITERION FOR PERIDYNAMICS
Abstract
Peridynamics (PD) is a new continuum mechanics formulation which is a very suitable methodology for failure prediction in materials and structures because of its mathematical structure. The widely used critical stretch-based and critical energy failure criteria in peridynamics for brittle materials is defined based on the definition of the critical energy release rate concept. However, these failure criteria may not be suitable for many materials showing fracture behavior other than brittle fracture. In addition, there are different conditions which require extra treatment when determining failure criterion and failure parameters such as compression after impact, high strain rate loading, self-healing, fatigue loading, mixed-mode fracture, etc. Moreover, crack initiation requires different criterion as well as advanced peridynamic formulations such as advanced state-based peridynamics and peridynamic beam, plate and shell formulations. Therefore, we will first determine failure criterion for ductile and quasi-brittle materials in state based peridynamic framework. We will the determine failure criterion for bonds in compression and interface bonds. We will also investigate the effect of strain rate, self-healing and mode-mixity on failure criterion. Finally, we will determine failure criterion for crack initiation, fatigue loading, advanced state-based peridynamic formulation, and peridynamic beam, plate and shell formulations. Determination of the failure criterion for different fracture behaviors, different material systems and loading conditions will enable accurate predictions for peridynamic analysis of problems of high importance to DoD especially for failure analysis of defense systems subjected to extreme temperatures, extremely corrosive environments, hypersonic conditions, and extreme events such as explosions, missile attacks, etc.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 22, 2024
- Source ID
- FA86552317037
Entities
People
- Selda Oterkus
Organizations
- Air Force Office of Scientific Research
- United States Air Force
- University of Strathclyde