... form has been developed for semi-elliptical surface cracks. Such a form will allow the estimation of J from the load versus crack mouth opening displacement test record of a single specimen. surface flaws semi-elliptical cracks ductile failure J -integral load separation single specimen...

... The application of the R6 failure assessment procedure to surface flaws requires the definition of a plastic yield load that characterizes the crack tip deformation at both the deepest and surface points on the defect. In this paper the results of finite element computations of the J -integral...

... with the analysis of experimental data on surface flaws, show that for surface flaws in sections experiencing some restraint, the assumption of rigid restraint is reasonable. For embedded flaws, pin jointing was assumed, rather than rigid restraint, since the equations are much simpler and the difference is smaller...

... As surface flaws grow in high-strength nickel-base superalloys, the growth along the free surface ( dc/dN ) can be much slower than growth in the depth direction ( da/dN ), even after accounting for variations in K along the crack front. This behavior reduces the crack aspect ratio ( c...

.... fatigue cracks crack coalescence life predictions surface flaws fracture mechanics A. F. Grandt, Jr., aA. B. Thakker, 2 and D. E. Tritsch 3 An Experimental and Numerical Investigation of the Growth and Coalescence of Multiple Fatigue Cracks at Notches REFERENCE: Grandt, A. F., Jr., Thakker, A. B...

... between the crack depths determined experimentally through post-test fractography and those predicted by the analytical potential-drop model. The critical barrier for fully automated monitoring of surface flaw crack growth with potential drop is the development of relationships to predict the crack aspect...

.... This paper presents the derivation of the method and recently obtained solutions for surface flaws, corner cracks at holes, and corner cracks at the edge of plates in tension and bending. Simple analytical expressions have been fit to these solutions which can be incorporated into computer routines for crack...

... predictions of J . Experimental procedures have been developed for direct evaluation of J at the root of surface cracks from quantities measured at the specimen surfaces. These procedures rely on the assumption that the line J-integral around the root of a surface flaw is sufficiently path-independent...

... Using annealed Type 304 stainless steel plate specimens containing ellipsoidal, rectangular, or triangular-shaped surface flaws, critical values of J are calculated for three separate situations: (1) the assumption that the specimen consists of a single-edge notch (SEN) and two unflawed...

... cannot be obtained from cracks grown under uniaxial loading. stress-intensity factors surface cracks photoelastic analysis three-dimensional crack problems surface flaws benchmark geometries fracture mechanics C. W. Smith^ and G. C. Kirby^ Stress-Intensity Distributions for Natural Cracks...

... and mechanical loading on crack growth. Crack growth behavior under landing gear stress spectra typical of Air Force and Navy usage is compared. crack growth steels environmental acceleration surface flaws crack growth prediction landing gear spectrum loads C. R. Saff and M. S. Rosenfeld2 Load...

... predicted in Ref 6 using semi-elliptic crack models with the same aspect ratio and a / T . frozen stress analysis stress-intensity distributions surface flaws photoelasticity C. W. Smith,' W. H. Peters,' G. C. Kirby,' and A. Andonian^ Stress-Intensity Distributions for Natural Flaw Shapes...

... technique will give reasonably accurate results for nozzle corner crack problems except in the regions of free surface. corner crack stress-intensity factors surface flaws fatigue (materials) finite-element analysis pressure vessels S. S. Palusamy^ and M. Raymund} Stress-Intensity Factor...

... The behavior of semi-elliptical surface flaws in cylinders is of interest in the technology of pressure vessels. The object of this study is to determine the stress intensity factor distribution around the crack front under arbitrary loading conditions for a longitudinal semi-elliptical flaw...

.... Results reveal that, for deep flaws, flaw shapes are not simple and flaw growth is not self-similar. The influence of this effect and its implications are discussed. stress intensity factors 3D crack problems surface flaws stress intensity distributions fatigue (materials) crack propagation...

... A series of tests was performed utilizing the stress freezing and slicing technique of photoelasticity in order to obtain the stress fields near points of maximum flaw penetration and where the crack border intersects the tensile surface of the plate for naturally grown surface flaws under...

... is to initiate further investigation of the effects of CFC. fractures (materials) stresses stress analysis cracks crack propagation analytic geometry strains surface flaws deformation tension tests J. L. Swedlow and M. A. Kitter Toward Assessing the Effects of Crack Front Curvature (CFC...