Date of Award
5-2013
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Physics
First Advisor
Majid Karimi, Ph.D.
Second Advisor
Gregory Kenning, Ph.D.
Third Advisor
Devki Talwar, Ph.D.
Abstract
Molecular dynamics (MD) and molecular statics (MS) simulations of crack propagation in the presence of defects in crystalline FCC metals under mode I loading are carried out on the (001)[100] crack system using the embedded atom method (EAM) interatomic potential. Substitutional impurity point defects are introduced into a 3D thin-strip slab of 160000 atoms at various distances from the crack tip. The critical load required for the initiation of crack propagation is obtained, along with the atomic level stress distribution near the crack tip. The results indicate that the critical load is dependent on the defect species, geometry, and position. When located directly at the crack tip, the defects reduce the peak internal stress, increasing the critical load relative to the defect-free system. As the defects are moved away from the crack tip the critical load goes through a minimum and approaches the value of the pure material asymptotically.
Recommended Citation
Petucci, Justin M., "A Study of Crack Propagation in Metals in the Presence of Defects" (2013). Theses and Dissertations (All). 1183.
https://knowledge.library.iup.edu/etd/1183