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  • 1
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    Optical methods of stress analysis applied to cracked components (1991)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: After briefly describing the principles of frozen stress photoelastic and moire interferometric analyses, and the corresponding algorithms for converting optical data from each method into stress intensity factors (SIF), the methods are applied to the determination of crack shapes, SIF determination, crack closure displacement fields, and pre-crack damage mechanisms in typical aircraft component configurations.
    Keywords: STRUCTURAL MECHANICS
    Type: In: Structural integrity of aging airplanes (A93-45772 19-01); p. 421-432.
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  • 2
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    Use of three-dimensional photoelasticity in fracture mechanics (1973)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: The philosophy of fracture mechanics is reviewed and utilized to formulate a simplified approach to the determination of the stress-intensity factor photoelastically for three-dimensional problems. The method involves a Taylor Series correction for the maximum in-plane shear stress (TSCM) and does not involve stress separation. The results are illustrated by applying the TSCM to surface flaws in bending fields. Other three-dimensional problems solved by the TSCM are cited.
    Keywords: STRUCTURAL MECHANICS
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  • 3
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    Fracture mechanics; Proceedings of the Seventeenth National Symposium, Albany, NY, August 7-9, 1984 (1986)
    In:  Other Sources
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    Publication Date: 2016-03-09
    Description: The present conference gives attention to topics in the application of fracture mechanics, subcritical crack growth phenomena, fracture testing methods, ductile fracture behavior, and fracture mechanisms and their analysis. Specific papers treat the resistance curve approach to composite materials characterization, fracture toughness in ductile iron and cast steel, hold-time effects in elevated temperature fatigue crack propagation, creep crack growth under nonsteady conditions, viscoplastic fatigue in a superalloy at elevated temperatures, fracture testing with arc bend specimens, one-point bend impact test application, and a compact mode II fracture specimen. Also discussed are the computation of stable crack growth using the J-integral, the use of plastic energy dissipation to characterize crack growth, the extension of surface cracks under cyclic loading, the minimum time criterion for crack instability in structural materials, dynamic crack propagation and branching under biaxial loading, and boundary layer effects in cracked bodies.
    Keywords: STRUCTURAL MECHANICS
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  • 4
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    Use of frozen stress in extracting stress intensity factor distributions in three dimensional cracked body problems (1992)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The adaptation of the frozen stress photoelastic method to the determination of the distribution of stress intensity factors in three dimensional problems is briefly reviewed. The method is then applied to several engineering problems of practical significance.
    Keywords: STRUCTURAL MECHANICS
    Type: In: International Congress on Experimental Mechanics, 7th, Las Vegas, NV, June 8-11, 1992, Proceedings. Vol. 1 (A94-12901 02-39); p. 530-536.
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  • 5
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    Stress intensity factors for deep cracks emanating from the corner formed by a hole intersecting a plate surface (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A technique consisting of freezing photo-elasticity and a numerical method was used to obtain stress intensity factors for natural cracks emanating from the corner at which a hole intersects a plate surface. Geometries studied were: (1) crack depth to thickness ratios of approximately 0.2, (2) 0.5 and 0.75; (3) crack depth to crack length ratios of approximately 1.0 to 2.0; and (4) crack length to hole radius ratios of about 0.5 to 2.0. All final crack geometries were grown under monotonic loading and growth was not self similar, with most of the growth occuring through the thickness under remote extension. Stress intensity factors were determined at the intersection of the flaw border.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-132484 , VPI-E-74-1-REV
    Format: application/pdf
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  • 6
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    Stress intensity and flaw-shape variations in surface flaws (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Flaw shapes and stress intensity distributions for a variety of technologically important surface-flaw problems using the frozen-stress method are described. Limitations of the method are noted. Results are used to illustrate effects peculiar to three-dimensional cracked-body problems.
    Keywords: STRUCTURAL MECHANICS
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  • 7
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    Stress intensity factors for long, deep surface flaws in plates under extensional fields (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Using a singular solution for a part circular crack by Smith, a Taylor Series Correction Method (TSCM) was verified for extracting stress intensity factors (SIFs) from photoelastic data. Photoelastic experiments were then conducted on plates with part circular and flat bottomed cracks for flaw depth to thickness ratios of 0.25, 0.50, and 0.75 and for equivalent flaw depth to equivalent ellipse length values ranging from 0.066 to 0.319. Experimental results agreed well with the Smith theory but indicated that the use of the 'equivalent' semi-elliptical flaw for correlating the part circular flaw results with semi-elliptical flaw results was not valid for a/2c much less than 0.20. Best overall agreement for the moderate (a/t about 0.5) to deep flaws (a/t about 0.75) and a/2c greater than 0.15 was found with a semi-empirical theory due to Newman when compared on the basis of equivalent flaw depth and area. The Smith theory, when correlated on the basis of flaw depth and area, appears to yield reasonable estimates (within 10%) of the SIF for flat bottomed flaws for the geometries studied here.
    Keywords: STRUCTURAL MECHANICS
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  • 8
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    Stress intensity factors for deep cracks emanating from the corner formed by a hole intersecting a plate surface (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A technique consisting of a marriage between stress freezing photoelasticity and a numerical method was used to obtain stress intensity factors for natural cracks emanating from the corner at which a hole intersects a plate surface. Geometrics studied were: crack depth to thickness ratios of approximately 0.2, 0.5, and 0.75; crack depth to crack length ratios of approximately 1.0 to 2.0. All final crack geometries were grown under monotonic loading and growth was not self similar with most of the growth occurring through the thickness under remote extension. Stress intensity plate surface K sub s factors were determined at the intersection of the flaw border with the plate surface K sub s and with the edge of the hole K sub h. Results showed that for the relatively shallow flaws K sub h approximately equal to 1.5 K sub s, for the moderately deep flaws K sub h approximately equal to K sub s, and for the deep flaws K sub h approximately equal to 0.5 K sub s, revealing a severe sensitivity of K to flaw geometry.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-136930 , VPI-E-74-1
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  • 9
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    Observations on sub-critical flaw growth in complex cracked body geometries (1982)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: This paper reviews an experimental method for estimating both flaw shapes and stress intensity factors for complex three dimensional cracked body problems encountered in the sub-critical flaw growth regime prior to instability. Examples of the use of the method are cited, and the energy-density approach is suggested as a theory of sufficient generality to accommodate the complex behaviors observed.
    Keywords: STRUCTURAL MECHANICS
    Type: Absorbed specific energy and/or strain energy density criterion; Sep 17, 1980 - Sep 19, 1980; Budapest; Hungary
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  • 10
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    Influence of flaw geometries on hole-crack stress intensities (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper deals with a frozen-stress photoelastic study of a class of flaw shapes where the ratio of the hole diameter to plate thickness is approximately unity. The study was carried out by a technique developed for estimating stress intensity factor variations along the border of flaws in three-dimensional problems. The results show that for deep flaws, the flaw shapes are not simple and the flow growth is not self-similar. The implications of this effect are discussed.
    Keywords: STRUCTURAL MECHANICS
    Type: Fracture mechanics; Jun 12, 1978 - Jun 14, 1978; Blacksburg, VA
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