scholarly journals Modeling of crack growth under mixed-mode loading by a molecular dynamics method and a linear fracture mechanics approach

2017 ◽  
Author(s):  
L. V. Stepanova
Keyword(s):  
Molecular Dynamics ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Mixed Mode ◽  
Molecular Dynamics Method ◽  
Mixed Mode Loading ◽  
Linear Fracture Mechanics ◽  
Linear Fracture ◽  
Dynamics Method

A Fracture-Mechanics-Based Methodology for Fatigue Life Prediction of Single Crystal Nickel-Based Superalloys

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Srikant Ranjan ◽  
Nagaraj K. Arakere
Keyword(s):  
Fatigue Crack ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Single Crystal ◽  
Crack Growth ◽  
Mixed Mode ◽  
Life Prediction ◽  
Shear Stresses ◽  
Crack Plane ◽  
Mixed Mode Loading

A comprehensive fracture-mechanics-based life prediction methodology is presented for fcc single crystal components based on the computation of stress intensity factors (SIFs), and the modeling of the crystallographic fatigue crack growth (FCG) process under mixed-mode loading conditions. The 3D finite element numerical procedure presented for computing SIFs for anisotropic materials under mixed-mode loading is very general and not just specific to fcc single crystals. SIFs for a Brazilian disk specimen are presented for the crack on the {111}) plane in the ⟨101⟩ and ⟨121⟩ directions, which represent the primary and secondary slip directions. Variation of SIFs as a function of thickness is also presented. Modeling of the crystallographic FCG behavior is performed by using the resolved shear stress intensity coefficient, Krss. This parameter is sensitive to the grain orientation and is based on the resolved shear stresses on the slip planes at the crack tip, which is useful in identifying the active crack plane as well as in predicting the crack growth direction. A multiaxial fatigue crack driving force parameter, ΔKrss, was quantified, which can be used to predict the FCG rate and, hence, life in single crystal components subject to mixed-mode fatigue loading.

PS21 Evaluation of crack growth behavior by SCC under corrosive environment based on non-linear fracture mechanics

2012 ◽  
Vol 2012 (0) ◽  
pp. _PS21-1_-_PS21-3_ ◽  
Author(s):  
Naohiro ISHIZUKA ◽  
Tomoyuki FUJII ◽  
Keiichiro TOHGO ◽  
Yoshinobu SHIMAMURA ◽  
Masahiro TAKANASHI ◽  
...  
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Growth Behavior ◽  
Crack Growth Behavior ◽  
Corrosive Environment ◽  
Linear Fracture Mechanics ◽  
Linear Fracture ◽  
Non Linear
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