Asymmetric Four-Point Crack Specimen

1999 ◽  
Vol 67 (1) ◽  
pp. 207-209 ◽  
Author(s):  
M. Y. He ◽  
J. W. Hutchinson
Keyword(s):  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Edge Crack ◽  
Shear Force ◽  
Finite Geometry ◽  
Basic Solution ◽  
Bend Specimen ◽  
Intensity Factors ◽  
Moment Distribution ◽  
Point Bend

Accurate results for the stress intensity factors for the asymmetric four-point bend specimen with an edge crack are presented. A basic solution for an infinitely long specimen loaded by a constant shear force and a linear moment distribution provides the reference on which the finite geometry solution is based. [S0021-8936(00)03601-1]

Stress Intensity Factors of a Three-Point Bend Specimen Under Dynamic Loading

2015 ◽  
Author(s):  
Yuh J. Chao ◽  
Poh-Sang Lam
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Stress Intensity Factors ◽  
Image Correlation ◽  
Dynamic Loads ◽  
Bend Specimen ◽  
Intensity Factors ◽  
Displacement Fields ◽  
Dynamic Loadings ◽  
Point Bend

Stress intensity factors for a three-point bend specimen under dynamic loadings are obtained through the displacement fields using digital image correlation (DIC) method. The dynamic loads are generated with a drop weight to impact the specimen while the crack remains stationary in this study. It shows that the stress intensity factor oscillates as a function of time. The experimental details and the comparison with theoretical solutions are presented.

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.

Stress Intensity Factors of Multiple Cracked Sheet With Riveted Stiffeners

1991 ◽  
Vol 113 (3) ◽  
pp. 280-284 ◽  
Author(s):  
T. Nishimura
Keyword(s):  
Stress Intensity ◽  
Integral Equations ◽  
Stress Intensity Factors ◽  
Fredholm Integral Equations ◽  
Multiple Cracks ◽  
Basic Solution ◽  
Intensity Factors ◽  
Single Crack ◽  
Numerical Examples ◽  
Unknown Density

A new method is proposed for analyzing the stress intensity factors of multiple cracks in a sheet reinforced with riveted stiffeners. Using the basic solution of a single crack and taking unknown density of surface tractions and fastener forces, Fredholm integral equations and compatibility equations of displacements among the sheet, fasteners, and stiffeners are formulated. After solving the unknown density, the stress intensity factors of multiple cracks in the sheet are determined. Some numerical examples are analyzed.

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