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Keywords: stress-intensity factors
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eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1999
ISBN-10: 0-8031-2611-5
ISBN: 978-0-8031-2611-4
... notches under constant or variable-amplitude loading. For this model, an algorithm for the description of the crack opening and closure behavior and approximation formulas were developed for the determination of the stress intensity factor K and the J -integral for surface, corner and through-thickness...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1440-0
ISBN: 978-0-8031-1440-1
... Two established optical methods are described briefly with refinements to allow accurate near-tip measurements for three-dimensional cracked body problems. Several illustrations of their use are presented and compared with numerical results. stress-intensity factors three-dimensional...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1440-0
ISBN: 978-0-8031-1440-1
... Stress-intensity factors for axial surface flaws in pipes can be sensitive to the radius to thickness ratio ( R/t ) of the pipe depending on the depth to thickness ( a/t ) and the depth to length ( a/c ) ratios of the crack. This study combines solutions from the literature for plates...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1440-0
ISBN: 978-0-8031-1440-1
... This paper presents a comparison among stress-intensity factors for mixed-mode two-dimensional problems obtained through three different approaches: displacement correlation, J -integral, and modified crack-closure integral. All mentioned procedures involve only one analysis step...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1440-0
ISBN: 978-0-8031-1440-1
... Recent advances in the weight-functions method have led to its application in determining stress-intensity factors ( K ) for corner and surface cracks. A major obstacle in accurately computing weight functions is that it not only requires the crack surface opening displacement (CSOD) fields...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1992
ISBN-10: 0-8031-1440-0
ISBN: 978-0-8031-1440-1
... results are presented for the crack opening displacements (COD) and the Mode I and Mode II stress-intensity factors (SIF) as functions of nondimensional frequency when normal and tangential time harmonic line loads are applied on the free surface of the layered medium. crack opening displacement...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1990
ISBN-10: 0-8031-1284-X
ISBN: 978-0-8031-1284-1
... Stress-intensity factors for surface cracks in cylindrical bars have been calculated applying the method of weight functions. The weight function was obtained from the crack opening displacement of a reference load using the finite-element method. The results can be used for the prediction...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1990
ISBN-10: 0-8031-1284-X
ISBN: 978-0-8031-1284-1
... at the intersection of the hole and crack boundaries. These ill-shaped elements tended to make the model too stiff and, hence, gave lower stress-intensity factors near the hole-crack intersection than models without these elements. Improved models, without these ill-shaped elements, were developed for a surface crack...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1989
ISBN-10: 0-8031-1250-5
ISBN: 978-0-8031-1250-6
... of such laminates is analyzed with particular emphasis on the stress singularity of the crack and the corresponding stress-intensity factors. The Lekhnitskii's method of complex stress functions for anisotropic bodies [ 1 ] is employed in the analysis of the strength of crack singularity. The crack problem...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1989
ISBN-10: 0-8031-1250-5
ISBN: 978-0-8031-1250-6
... on the follower surface than on the driver surface can be clearly explained. The variations of three-dimensional, mixed-mode stress-intensity factors for an embedded elliptical crack under a Hertzian contact pressure moving over the surface are analyzed. The crack opening occurs near the leading crack tip...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-0972-5
ISBN: 978-0-8031-0972-8
... This paper presents stress-intensity factors for a wide range of quarter-elliptical corner cracks in rectangular bars. Cracked configurations were subjected to remote tension, in-plane bending, or out-of-plane bending. The ratio of crack depth to crack length ranged from 0.2 to 2; the ratio...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-0972-5
ISBN: 978-0-8031-0972-8
..., and, in the neighborhood of the reentrant corner, has stress-free boundaries. The methods described herein can be adapted to cases without such restrictions. finite-element methods p -extension fracture mechanics elasticity stress-intensity factors mixed mode extraction methods convergence error estimate...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-0972-5
ISBN: 978-0-8031-0972-8
... The elastic line spring model is updated to accept arbitrarily distributed loads acting on plates to allow determination of stress-intensity factors of surface cracks under various types of loading, such as thermal stress and residual stress. The governing integral equations are modified, owing...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-0972-5
ISBN: 978-0-8031-0972-8
... Accurate calculations of the stress-intensity factors ( K ) are essential for assessment of the integrity of structural components containing crack-like defects. For the complex tubular joints used in the construction of offshore structures, accurate K solutions do not exist. Only limited...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-0925-3
ISBN: 978-0-8031-0925-4
... propagation maximum elastic stress notch root radius stress concentration factors stress-intensity factors plastic zone sizes nonpropagating crack linear fracture mechanics linear notch mechanics Hironobu Nisitani^ and Masahiro Endo^ Unified Treatment of Deep and Shallow Notches in Rotating Bending...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1983
ISBN: 978-0-8031-0729-8
... In this paper the experimental method of reflected caustics was used for the evaluation of the dynamic stress-intensity factors K I d and K II d for running cracks propagating under constant velocity. The elastodynamic equations for the reflected caustics formed from light rays...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1983
ISBN-10: 0-8031-0728-5
ISBN: 978-0-8031-0728-1
... Using a finite-element method and thermal simulation, stress-intensity factors are determined for a uniform array of equal depth radial cracks emanating from the internal boundary of a pressurized, autofrettaged thick-wall cylinder. The computation of the same by methods of load relief...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1983
ISBN-10: 0-8031-0728-5
ISBN: 978-0-8031-0728-1
... This paper presents empirical stress-intensity factor equations for embedded elliptical cracks, semielliptical surface cracks, quarterelliptical corner cracks, semielliptical surface cracks at a hole, and quarterelliptical corner cracks at a hole in finite plates subjected to remote tensile...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1983
ISBN-10: 0-8031-0728-5
ISBN: 978-0-8031-0728-1
... and compared with analytical results. It was found that (1) cracks grown in uniform remote tension retain their semielliptic shape but exhibit nonself-similar flaw growth, (2) stress-intensity factor (SIF) distributions compare favorably with results from finite element models, and (3) benchmark geometries...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1983
ISBN-10: 0-8031-0728-5
ISBN: 978-0-8031-0728-1
... are useful in evaluating stress-intensity factors for cracks in bodies subjected to complex stress conditions, and convenient curve fits suitable for numerical calculations are provided. The stress intensities are obtainable for arbitrary stresses by numerical integration techniques. Comparisons...