scholarly journals Crack initiation life in notched Ti-6Al-4V titanium bars under uniaxial and multiaxial fatigue: synthesis based on the averaged strain energy density approach

2017 ◽  
Vol 11 (41) ◽  
pp. 8-15 ◽  
Author(s):  
Giovanni Meneghetti ◽  
Alberto Campagnolo ◽  
Filippo Berto ◽  
Keisuke Tanaka
Keyword(s):  
Energy Density ◽  
Crack Initiation ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Multiaxial Fatigue ◽  
Crack Initiation Life

Case Criterion of Crack Onset in Orthotropic Bi-Material Notches

2011 ◽  
Vol 465 ◽  
pp. 157-160 ◽  
Author(s):  
Tomáš Profant ◽  
Jan Klusák ◽  
Michal Kotoul
Keyword(s):  
Energy Density ◽  
Crack Initiation ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Local Minimum ◽  
Plane Elasticity ◽  
Mean Value ◽  
Density Factor ◽  
The Mean ◽  
Energy Density Factor

A bi-material notch composed of two orthotropic parts is considered. The stresses and displacements are expressed using the Stroh-Eshelby-Lekhnitskii formalism for plane elasticity. The potential direction of crack initiation is determined from the maximum mean value of the tangential stress or the local minimum of the mean value of the generalized strain energy density factor in both materials [1, 2]. The matched asymptotic procedure is introduced to derive the change of potential energy for the debonding crack and the crack initiated in the determined direction [3].

Probabilistic Fatigue Crack Initiation and Propagation Fields Using the Strain Energy Density

2018 ◽  
Vol 50 (4) ◽  
pp. 620-635 ◽  
Author(s):  
J. A. F. O. Correia ◽  
P. J. Huffman ◽  
A. M. P. De Jesus ◽  
G. Lesiuk ◽  
J. M. Castro ◽  
...  
Keyword(s):  
Fatigue Crack ◽  
Energy Density ◽  
Crack Initiation ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Fatigue Crack Initiation ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

scholarly journals Prediction of Crack Initiation Direction for Surface Flaws Under Biaxial Loading

2003 ◽  
Vol 125 (1) ◽  
pp. 65-70 ◽  
Author(s):  
Abdennour C. Seibi ◽  
Sam Y. Zamrik
Keyword(s):  
Energy Density ◽  
Crack Initiation ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Biaxial Stress ◽  
Crack Trajectory ◽  
Fracture Crack ◽  
Density Factor ◽  
Crack Angle ◽  
Energy Density Factor

This paper presents a simple method based on the strain energy density factor ΔS to study the fatigue characteristics of rhombic plates with induced angled flaws under biaxial stress field. The paper discusses in detail the procedures followed to predict the fracture crack initiation angle, θo, as a function of induced crack angle, β, the path of the crack trajectory at the initial stage of fracture and develop an expression for the crack growth rate. This method assumes that the crack extends in a radial direction and that the initial fracture crack angle, θo, is obtained by maximizing the hoop stress along a circumference of a radius r. Expressions for the stress-state near the crack tip were developed for computing the crack trajectory and the strain energy density factor. The crack trajectory path was estimated by computing the new values of the crack angle and a fictitious crack length. These computed values were in turn used to determine the strain energy density factor. The developed method revealed two important observations: i) The crack trajectory was in close agreement with the experimental data for the first 20% of the lifetime to failure, ii) the crack propagation rate is dependent on the crack angle using the stress intensity factor and exhibited no variation with respect to the crack angle when the strain energy density factor is used.

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