scholarly journals Determination of local stress intensity factors at microstructurally tortuous crack fronts under remote mode II loading

2017 ◽  
Vol 7 ◽  
pp. 254-261
Author(s):  
Stanislav Žák ◽  
Jana Horníková ◽  
Pavel Šandera ◽  
Tomáš Vojtek ◽  
Jaroslav Pokluda
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Local Stress ◽  
Mode Ii ◽  
Intensity Factors ◽  
Mode Ii Loading

Stress Intensity Factors for Rough Cracks Loaded in Mode II

2016 ◽  
Vol 258 ◽  
pp. 310-313 ◽  
Author(s):  
Stanislav Žák ◽  
Jana Horníková ◽  
Pavel Šandera
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Local Stress ◽  
Compact Tension ◽  
Shear Mode ◽  
Mode Ii ◽  
Intensity Factors ◽  
Mechanical Models ◽  
Related Stress ◽  
Mode Ii Loading

Most fracture mechanical models do not take the materials microstructure into account and use averaged material properties although the real crack flanks and fronts exhibit microstructurally induced tortuous shapes. These influences the stress-strain field at the crack front as well as the related stress intensity factors. This phenomenon was investigated by some authors only for remote mode I loading and was named geometrically induced shielding. This study is focused on the analysis of the stress intensity factors for rough cracks loaded in the shear mode II by modelling the Compact-Tension-Shear (CTS) specimen containing cracks of various roughness. The study revealed that, in accordance with our previous study, already small changes in the crack roughness have a rather high influence on the local field of stress intensity factors. The local stress intensity factor KII decreases with increasing roughness and, for its higher levels, it converges to a constant value that is significantly lower than that of the remote mode II loading associated with the planar crack of the same length.

Local and equivalent stress intensity factors for tortuous cracks under remote mode II loading

2019 ◽  
Vol 101 ◽  
pp. 35-45 ◽  
Author(s):  
Stanislav Žák ◽  
Jana Horníková ◽  
Pavel Šandera ◽  
Tomáš Vojtek ◽  
Marta Kianicová ◽  
...  
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Equivalent Stress ◽  
Mode Ii ◽  
Intensity Factors ◽  
Mode Ii Loading

DETERMINATION OF RESIDUAL STRESSES AND STRESS INTENSITY FACTORS BY REMOVING LOCAL MATERIAL

2017 ◽  
Vol 48 (4) ◽  
pp. 377-398
Author(s):  
Svyatoslav Igorevich Eleonskii ◽  
Igor Nikolaevich Odintsev ◽  
Vladimir Sergeevich Pisarev ◽  
Stanislav Mikhailovich Usov
Keyword(s):  
Stress Intensity ◽  
Residual Stresses ◽  
Stress Intensity Factors ◽  
Intensity Factors ◽  
Local Material

Experimental Determination of KI for Short Internal Cracks

2001 ◽  
Vol 68 (6) ◽  
pp. 937-943 ◽  
Author(s):  
K. Bearden ◽  
J. W. Dally ◽  
R. J. Sanford
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Edge Crack ◽  
Series Solution ◽  
Experimental Studies ◽  
Experimental Methods ◽  
Internal Crack ◽  
Intensity Factors ◽  
Mode Stress

Since the pioneering discussion by Irwin, a significant effort has been devoted to determining stress intensity factors (K) using experimental methods. Techniques have been developed to determine stress intensity factors from photoelastic, strain gage, caustics, and moire´ data. All of these methods apply to a relatively long single-ended-edge crack. To date, the determination of K for internal cracks that are double-ended by experimental methods has not been addressed. This paper describes a photoelastic study of tension panels with both central and eccentric internal cracks. The data recorded in the experiments was analyzed using a new series solution for the opening-mode stress intensity factor for an internal crack. The data was also analyzed using the edge-crack series solution, which is currently employed in experimental studies. Results indicated that the experimental methods usually provided results accurate to within three to five percent if the series solution for the internal crack was employed in an overdeterministic numerical analysis of the data. Comparison of experimental results using the new series for the internal crack and the series for an edge crack showed the superiority of the new series.

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