Experimental Study of Near-Crack-Tip Deformation Fields

2009 ◽  
pp. 225-225-21
Author(s):  
F-P Chiang ◽  
S Li ◽  
YY Wang
Keyword(s):  
Experimental Study ◽  
Crack Tip

The influence of fiber-crack angle on the crack tip parameters in orthotropic materials

2016 ◽  
Vol 231 (3) ◽  
pp. 418-431 ◽  
Author(s):  
M Fakoor ◽  
R Rafiee ◽  
M Sheikhansari
Keyword(s):  
Experimental Study ◽  
Structural Design ◽  
Critical Angle ◽  
Design Procedure ◽  
Crack Tip ◽  
Maximum Load ◽  
Orthotropic Materials ◽  
Fiber Direction ◽  
Catastrophic Failure ◽  
Crack Angle

Identification of the critical angle between fiber and crack direction in orthotropic materials for avoiding catastrophic failure is necessary. Recognition of the optimum regions for creating notches in orthotropic materials for creation of maximum load-bearing capability is an important parameter in structural design. In this paper, the critical angles between crack and fiber direction are predicted, extracting crack tip parameters in orthotropic materials using stress series expansion and numerical method. The variations of crack tip parameters with respect to the angle between crack and fiber for modes I and II are presented. The presented functions for these variations can be used in the optimum design procedure of orthotropic structures. The obtained results are validated using experimental study.

scholarly journals NUMERICAL PHOTOMECHANICS: NUMERICAL PROCESSING OF PHOTOELASTICITY EXPERIMENTS AND ITS APPLICATION TO THE PROBLEMS OF FRACTURE MECHANICS PROBLEMS

2017 ◽  
Vol 19 (9.2) ◽  
pp. 63-73
Author(s):  
T.E. Gerasimova ◽  
P.N. Lomakov ◽  
L.V. Stepanova
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Asymptotic Expansion ◽  
Fracture Mechanics ◽  
Asymptotic Expansions ◽  
Strain State ◽  
Crack Tip ◽  
Displacement Fields ◽  
Photoelasticity Method ◽  
Stress And Displacement Fields

On the basis of photoelasticity method the experimental study of near crack tip stressed strain state in specimens under mixed loading conditions is performed. Carried out experimental investigation allows to obtain coefficients of full asymptotic expansions of stress and displacement fields in the vicinity of the crack tip and alos to find coefficients of highest approach in Williams full asymptotic expansion.

Controlled Initiation of Short Fatigue Cracks in 316L Steel

2005 ◽  
Author(s):  
D. Stefanescu ◽  
J. Marrow ◽  
M. Preuss ◽  
A. Sherry
Keyword(s):  
Experimental Study ◽  
Stainless Steel ◽  
Crack Opening Displacement ◽  
Crack Nucleation ◽  
Fatigue Cracks ◽  
Crack Opening ◽  
Crack Tip ◽  
Image Correlation ◽  
Opening Displacement ◽  
R Ratio

Validation of models for short crack behavior requires accurate measurement of crack opening displacement and crack tip strain fields. Development of reliable measurement procedures, using new techniques such as Image Correlation (IC), requires specimens containing cracks with a well defined geometry. In this paper, results of an experimental study concerning controlled initiation of short fatigue cracks at positive R-ratio in laboratory specimens made from 316L stainless steel are presented. Experimental techniques, including hardness testing and X-ray diffraction were employed in order to investigate the effect of surface preparation on the surface mechanical properties and residual stresses. Crack nucleation is difficult in smooth specimens of 316L austenitic stainless steel at positive R-ratio due to the high fatigue limit and low tensile strength. Specimens with a thin ligament were therefore developed to enable nucleation of a single short fatigue crack. An experimental study of the crack growth aspect ratio evolution was then carried out using a beach marking technique. The technique described in this paper enables single short fatigue cracks of well defined geometry to be nucleated under tensile cyclic loading. Stress corrosion cracks can be developed using the same specimen geometry. Miniature tensile specimens can then be extracted to perform in-situ measurements of the crack opening displacement and crack tip strain field by Image Correlation from Scanning Electron Microscopy observations.

An experimental study of the deformation fields around a propagating crack tip

1998 ◽  
Vol 38 (2) ◽  
pp. 79-85 ◽  
Author(s):  
Y. J. Chao ◽  
P. F. Luo ◽  
J. F. Kalthoff
Keyword(s):  
Experimental Study ◽  
Crack Tip ◽  
Propagating Crack

An experimental study of crack tip plastic flow in mild steel

1981 ◽  
Vol 14 (3) ◽  
pp. 565-580 ◽  
Author(s):  
S.N. Bandyopadhyay ◽  
N. Singh ◽  
G.S. Murty
Keyword(s):  
Experimental Study ◽  
Mild Steel ◽  
Plastic Flow ◽  
Crack Tip
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