Showing papers in "Engineering Fracture Mechanics in 1978"

TL;DR: In this paper, a simple representation for the crack-face displacement is employed to compute a weight function solely from stress intensity factors for a reference loading configuration, and the weight function for a corner crack in an LMFBR hexagonal sub-assembly duct is constructed from stress-intensity-factor results for the uniformly over-pressurized case.

TL;DR: In this article, the combined effect of load biaxiality and crack orientation on K l, K II, maximum shear, anile of initial crack extension, elastic strain energy density, as well as on the local strain energy rate is made explicit.

TL;DR: In this article, field equations of nonlocal elasticity are solved to determine the state of stress in a plate with a line crack subject to a constant anti-plane shear, and it is found that no stress singularity is present at the crack tip.

TL;DR: In this paper, the authors extended the finite element method to direct calculation of combined modes I and II stress intensity factors for axisymmetric and planar structures of arbitrary geometry and loading.

TL;DR: In this article, the authors investigated the effect of load biaxiality on the crack-tip region and showed that the impact of load applied parallel to the plane of the crack appears entirely in the second terms of the series representations for local stress and displacement.

TL;DR: In this paper, a semi-infinite plate with triangular notch and a crack originating from a triangular notch is analyzed and an approximate expression of the stress intensity factor for some angles of a notch and crack length is presented.

TL;DR: In this article, a mechanism of retardation is proposed, deriving from metallographic observations, for aluminum alloys, based on the rate of overload and its intensity, but other factors such as the number of overloads and the frequency of the test are considered.

TL;DR: In this article, short duration tensile stress pulses have been used to study the interaction of two parallel cracks in a brittle solid and the interaction was found to agree very well with that predicted by Yokobori et al.

TL;DR: In this article, the authors investigated the fatigue behavior of local structural assemblies under loadings that differ from the fatigue test loading in magnitude or in statistical distribution, or after a local change in structural sizes or design, stress concentrations m critically loaded assemblies are considered.

TL;DR: In this article, a study of the behavior of notched plexiglas specimens under stress pulses created from an air-gun was undertaken, and it was concluded that the initial notch is propagated by steps under the action only of tensile stress pulses, while the compressive stress pulses do not have any influence on crack propagation.

TL;DR: In this paper, the authors deal with plane elastic, longitudinal shearing and thin plate bending problem and use the general formulas of stress concentration factor, methods for calculating stress intensity factor are mentioned.

TL;DR: In this article, the growth of cracks in Ti-6Al-4V alloy was studied in fatigue tests in which the maximum load each cycle was held constant for a chosen dwell-time, and the results were compared with those obtained using sinusoidal stressing.

TL;DR: In this article, a medium-strength pressure vessel steel, A533 B, which had been annealed to produce materials with widely varying prior austenite grain sizes was tested at two temperatures, normal room temperature and liquid nitrogen temperature, both on the lower shelf of the material's Charpy energy curve.

TL;DR: In this paper, the concept of load relief factor was used to determine in an approximate manner stress intensity factors for a multiply-cracked plane and an axisymmetric body, which is used in ordnance design applications and serve as guidance until more rigorous analyses become available.

TL;DR: In this article, it has been suggested that the crack closure concept can account for the retardation in crack growth rate following removal of tensile overloads indicating that the closure concept cannot explain the decrease in the growth rate.

TL;DR: In this paper, the authors solved the case of a parabolic stress distribution within the plastic strip zone and investigated the relation between stress intensity factor, yield stress and crack opening displacement.

TL;DR: A concise review of microstructural influences on fatigue strength, fatigue crack propagation, fracture toughness, and stress corrosion in high strength aluminium alloys, titanium alloys and steels is given in this article.

TL;DR: In this paper, the authors investigated the delayed retardation phenomena in three steels and two aluminum alloys and confirmed that the model proposed by Matsuoka et al. was in good agreement with the experimental data for these materials when the stress state at the overloading was satisfied with the small scale yielding condition.

TL;DR: In this paper, the authors describe the four parameter method of analysis for determining the stress intensity factor K using photoelastic isochromatic fringe patterns associated with cracks propagating in centerpin loaded, eccentric-pin-loaded and crack line-loaded SEN specimens of Homalite 100.

TL;DR: In this paper, a relationship between tearing force and tensile properties is deduced by analogy with notched tensile failure and proves to be quite accurate in predicting the tearing forces of a wide range of materials.

TL;DR: In this article, the role of strain in the fracture of low strength steel in the temperature range of −196 to 28°C and at the crack tip strain rate range of 10 −5 to 10°/sec.

TL;DR: In this paper, a strong correlation between the stress intensity at crack branching and Young's modulus was found for crack branching in 20 ceramics and glasses at a strain intensity close to 3.3 × 10 −5 m 1 2.

TL;DR: In this paper, the authors developed an equation for predicting and sliding modes of crack growth along planes of geometric symmetry in viscoelastic orthotropic media with and without large prestrains.

TL;DR: In this paper, the interaction between a macroscopic crack and microscopic, continuously distributed, damage is studied both for time-independent and time-dependent damage formation, and the critical external load to cause unstable crack propagation is found as a function of crack length.

TL;DR: In this article, the effects of crack closure on the fatigue crack growth rate were investigated using an extensometer placed across the crack in order to study the impact of crack closures on the growth rate of aluminum alloys.

TL;DR: In this article, the effect of mesh geometry on the accuracy of finite element solutions for fracture problems was studied and suggestions were given for the determination of the optimum mesh for several types of problems using linear displacement and quadratic displacement quadrilateral.

TL;DR: In this article, the authors analyzed the fatigue process of a macroscopic crack and continuously distributed microdamage near the crack-tips, using a Dugdale crack model and showed good agreement with Paris' law for fatigue crack propagation.

TL;DR: In this paper, several different fracture theories are developed for materials with cracks confined to the surface, assuming that crack planes are normal to surface, but are otherwise randomly oriented, and the simplest theory assumes that only the component of stress normal to the crack plane contributes to fracture.

TL;DR: In this article, the authors derived stress intensity coefficients for DCB specimens with either machined slits or cracks using the Irwin-Kies method and compared the analyses of Gross and Srawley and Ripling, Mostovoy and Patrick.

TL;DR: In this article, the body force method was applied to the stress analysis of the arbitrarily shaped plate with an inner or edge crack, and the resultant forces along the boundary were satisfied as boundary condition.