Showing papers in "Engineering Fracture Mechanics in 1987"

TL;DR: A unified derivation of crack tip flux integrals and their associated domain representations is laid out in this article using a general balance statement as the starting point, and complementary integrals which are valid for general material response and arbitrary crack tip motion are obtained.

TL;DR: A general finite element procedure for obtaining strain-energy release rates for crack growth in isotropic materials is presented in this article, which is applicable to two-dimensional finite element analyses and uses the virtual crack-closure method.

TL;DR: In this article, the development of an anisotropic theory of continuum damage mechanics for ductile fracture is described, where a tensor tensor M(D) is used to characterize damage evolution and a constitutive equation of plasticity is formulated.

TL;DR: In this article, a method of determining stress intensity factors using digital image correlation is presented, and the experimental and analytical method is described with results for different specimen geometries given.

TL;DR: In this article, the authors investigated the mode I and mode II strain energy release rates for a crack lying along the interface of two dissimilar elastic media and by using the finite element method.

TL;DR: In this paper, the fracture mechanics stress intensity, K, measured for the cleavage strength of carbon steel by Professor Yokobori and colleagues, at Tohoku University and elsewhere, is shown to follow a Hall-Petch dependence on average grain diameter, l, in accordance with the model-based relationship K = c's 1 2 [σ 0 +kl −1 2 ] for which c' is a numerical factor, 5 is the effective length of the local plastic zone associated with unstable crack growth, σ 0 is a friction stress for appropriate dislocation movement within the poly

TL;DR: In this article, the authors defined the size scale effects in structural members with re-entrant corners and emphasized the interaction between stress-intensity collapse and ultimate strength collapse at the ligament.

TL;DR: In this paper, an approximate method to derive the crack opening displacement field from the stress intensity factor was proposed by Petroski and Achenbach [Engng Fracture Mech. 10, 257].

TL;DR: In this article, mixed-mode fracture of soda-lime glass was studied using a diametral-compression test that features disk specimens with symmetric through-cracks.

TL;DR: In this paper, the static fracture toughness of oil shale, which is a typical layered rock containing fossil fuel, was measured using static tests, and the fracture toughness was determined using a stress intensity factor method, a compliance method and a J- integral based method.

TL;DR: In this article, a mathematical model that describes the fatigue crack growth evolution and associated scatter in polycrystalline solids is presented, based on the analogy that an analogy exists between a particular discontinuous Markovian stochastic process, namely the general pure birth process, and the crack propagation process.

TL;DR: In this paper, the authors extended the maximum circumferential tensile stress theory to anisotropic solids, and formulated the criteria in terms of the maximization of the ratio of the Maximum Circular Tensile Stress (MCTS) over the material critical tensile strength.

TL;DR: In this paper, the authors describe simple approaches and attendant computational algorithms, wherein, the "crack-tip integral" parameters may be evaluated through equivalent domain integrals (EDI) alone.

TL;DR: In this article, a method for the determination of the effective moduli of elastic solids containing a doubly periodic rectangular array of cracks is given, based on the analysis of a unit cell in which the displacement vector is expanded to a second order in the distances from centerlines.

TL;DR: In this paper, a new technique is proposed to circumvent the sensitivity of the J 2 integral to crack tip modeling by using the non-singular stress component σ x 0 to predict crack kinking angles.

TL;DR: In this paper, the general dominance of mode I growth at mixed mode loading (via kinking or tilting of the crack edge) is examined, and it is shown that mode I can be suppressed by superposition of a high pressure.

TL;DR: In this paper, the stress intensity factors for a crack of arbitrary planar shape near a bimaterial interface are calculated using Green's functions for perfectly bonded elastic half-spaces.

TL;DR: In this article, a model for the fatigue crack propagation is developed which incorporates the bulk cyclic and low-cycle fatigue properties of the material and predicts the R-ratio effects on the fatigue cracks growth at low and intermediate stress intensities.

TL;DR: In this paper, the authors present a simple method for the analysis of fracture propagation in orthotropic materials, which is applicable to a wide range of materials such as steel, rock and composites.

TL;DR: In this article, the authors examined the thermal shock due to sudden surface heating of an edge-cracked plate and compared with the opposite thermal shock condition that is associated with surface cooling, and showed that surface heating results in compressive transient thermal stresses close to the plate surface which force the crack surfaces together over a certain contact length.

TL;DR: In this article, a model expressed by the J-integral was proposed assuming that the crack growth is determined by the linear summation of relations of pure Mode I and II crack-tip deformation.

TL;DR: In this paper, stress intensity factors for one and two, internal and external axial cracks in hollow cylinders subjected to stress gradients arising from a thermal shock were determined for a wide range of cylinder geometries.

TL;DR: In this paper, an analysis and discussion of existing estimates of the J-integral for cracks in infinite bodies is presented, which provides convenient estimates for Ramberg-Osgood type elasto-plastic materials containing cracks and subjected to multiaxial loading.

TL;DR: In this paper, two essentially different methods for the determination of the effective elastic moduli of a cracked body under plane stress or plane strain deformations are given, where cracks are randomly oriented and distributed such that the cracked material is effectively isotropic.

TL;DR: In this paper, a cylindrical circumferentially notched and fatigue cracked specimen for estimating KIc finite element studies carried out are discussed with specific attention to the comparison between the results obtained to that obtained experimentally.

TL;DR: In this paper, the elastic interaction between a screw dislocation and a crack of finite length is analyzed and the effects of the dislocations inside the crack and the curvature of the crack are discussed.

TL;DR: In this paper, a method for determining the fatigue notch-size effect is presented based upon the development of closure in the wake of a newly formed crack growing from a notch, and the effect of crack closure on the formation of non-propagating cracks at notches and on notch sensitivity is also discussed.

TL;DR: In this article, a finite element analysis procedure has been established to calculate the stress intensity factors of a surface flaw with curved crack surfaces and front in a three-dimensional structure under mixed-mode loading conditions.

TL;DR: In this article, a new damage mechanics parameter V D is proposed, which is valid for characterizing ductile fracture, and a damage mechanics criterion is established based on a continuum damage mechanics model.