Activation analysis of dislocation nucleation from crack tip in. alpha. -Fe

Journal Article · Fri Feb 15 04:00:00 EST 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.348735· OSTI ID:5675874

Cheung, K S ^[1]; Argon, A S ^[2]; Yip, S ^[3]

---

1. Nuclear Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (US)
2. Mechanical Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)
3. Nuclear Engineering Department, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (USA)

Guided by a recent molecular dynamics simulation study of mode I crack-tip environment in {alpha}-Fe using an embedded atom method potential, an activation analysis of the nucleation of a half-square dislocation loop from the tip of a tensile crack has been carried out based on the Rice and Thomson approach (Philos. Mag. {bold 29}, 78 (1974)). The effects of elastic softening due to stress and temperature as well as the nonlinear stress distribution around the crack are introduced by incorporating the simulation results self-consistently into the analysis, reducing the previously overestimated activation barrier by a factor of over 15.

• DOE Contract Number: FG02-87ER45294
• OSTI ID: 5675874
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 69:4; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ACTIVATION ANALYSIS
CHEMICAL ANALYSIS
CRACKS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELEMENTS
IRON
IRON-ALPHA
LINE DEFECTS
METALS
NONLINEAR PROBLEMS
NUCLEATION
SELF-CONSISTENT FIELD
SIMULATION
STRESSES
TRANSITION ELEMENTS