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Showing papers in "Engineering Fracture Mechanics in 1991"


Journal ArticleDOI
TL;DR: In this paper, a universal weight function expression with suitable reference stress intensity factors was used to derive the weight functions for internal and external radial cracks in a thick cylinder, and these weight functions were then further used to calculate the stress intensity factor for radial cracks.

276 citations


Journal ArticleDOI
TL;DR: In this paper, the authors present the blister test for the measurement of interface fracture toughness for a thin film bonded to an elastic substrate, where the load applied in order to debond the film is either hydrostatic pressure or a point load.

149 citations


Journal ArticleDOI
TL;DR: In this article, a strip crack closure model based on the original Dugdale-Barenblatt model was investigated for various aspects of fatigue crack growth behavior, and a variable constraint factor was introduced into the model to account for the 3D effect at the crack tip.

140 citations


Journal ArticleDOI
TL;DR: In this article, a number of modifications are introduced to the linear elastic approach to establish a new parameter which is capable of correlating both long crack and short crack fatigue crack growth data.

110 citations


Journal ArticleDOI
TL;DR: In this paper, a singular integral method is used to represent the cracks in the mathematical model and the results obtained show that interaction between microcracks could produce either an enhancement or a shielding effect on the stress intensity factor depending on the positions and orientations of the micro-cracks.

80 citations


Journal ArticleDOI
TL;DR: In this paper, a continuum damage model for Isotropie ductile fracture is derived from a new dissipation potential chosen by the author and a comparison between the damage model and experimental results is presented and a good agreement is found.

71 citations


Journal ArticleDOI
Dieter Radaj1, S. Zhang1
TL;DR: In this paper, the structural stress state at the weld spot edge is determined, in this case by the finite element method, then the stress state is decomposed, edge point by edge point, into symmetrical and antisymmetrical components of membrane, bending, transverse shear and longitudinal shear stresses.

71 citations


Journal ArticleDOI
TL;DR: In this article, the authors used edge-cracked bend bar specimens loaded in anti-symmetric and symmetric four-point bend configurations to investigate fracture micro-mechanisms of four grades of steel.

58 citations


Journal ArticleDOI
TL;DR: In this paper, an elastic-viscoplastic model of a ductile porous material is used to represent small second phase particles that nucleate cavities at large strains as well as larger inclusions with low strength, which result in large voids near the crack tip at early stage.

56 citations


Journal ArticleDOI
Dieter Radaj1, S. Zhang1
TL;DR: In this article, the procedure for calculating the stress intensity factors at the edge of spot welds on the basis of the structural stresses is further simplified and compared with a recent solution from literature.

54 citations


Journal ArticleDOI
TL;DR: In this article, three crack tip parameters, C ∗ (t), C (t ) and C t, are identified and discussed in detail for characterizing the creep crack growth rate at elevated temperatures in ductile materials.

Journal ArticleDOI
TL;DR: In this article, the experimental and theoretical results obtained from mixed mode (I and II) fatigue crack growth tests in Jethete at 550°C were described and compared with the pure mode I data using a stress intensity factor range.

Journal ArticleDOI
TL;DR: In this article, the authors worked out the physical meaning of these curves and derived the difference between crack-initiation toughness and crack-growth toughness from the energy balance during quasi-static crack growth.

Journal ArticleDOI
TL;DR: In this article, the tangential strain energy density factor possesses a maximum value and when it reaches a critical value in the angled crack problem, and this criterion is able to be applied to this problem.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of specimen size on creep crack growth behavior in high temperature engineering plant and found that as the specimen thickness increased, the growth rate increased.

Journal ArticleDOI
TL;DR: In this article, the generalized driving force attached to a fatigue crack tip is in the first instance re-examined with the introduction of a new cyclic J-integral.

Journal ArticleDOI
TL;DR: In this article, the weight function for the surface point of a semi-elliptical crack in a plate of finite thickness has been derived and tested against numerical data available in the literature.

Journal ArticleDOI
TL;DR: In this paper, the authors used the complex variable approach to solve Hubert problems, and the results were used to obtain thermal stress intensity factors in an infinite two-dimensional elastic bimaterial.

Journal ArticleDOI
TL;DR: In this paper, a shear spring model is adopted to reduce the problem to the analysis of a cracked plate and a patch subjected to external loads and interacting adhesive shear, and a special fundamental solution satisfying the boundary condition on the crack surface is introduced.

Journal ArticleDOI
TL;DR: In this paper, a closed-form solution of crack opening as a function of external loading is derived by approximating the residual stress field due to the volume expansion in the transformed zone as that of an edge dislocation pair.

Journal ArticleDOI
TL;DR: In this paper, a loading stage for the scanning electron microscope has been used in conjunction with the stereo imaging technique to study fatigue crack closure for a center notched specimen of an aluminum alloy.

Journal ArticleDOI
TL;DR: The free-edge stress intensity factor, denoted by Kf, depends on a characteristic stress, layer height, and Poisson's ratio in a manner analogous to that determined previously for a layer subjected to transverse tension as mentioned in this paper.


Journal ArticleDOI
TL;DR: In this article, the authors investigated the crack initiation and crack path in a mixed-mode static and cyclic crack with uniaxial loading in 2024-T3 Al-Alloy sheets.

Journal ArticleDOI
TL;DR: An expression for the mode I stress intensity factor for single edge-notch panels under fixed-grip loading is derived using known solutions for uniform tension and pure bending cases in this article.

Journal ArticleDOI
TL;DR: In this article, an elastic stress analysis of the interleaved end notched flexure specimen was conducted by two-dimensional finite element modeling and the authors identified mechanisms that influence the enhancement of mode II interlaminar fracture toughness.

Journal ArticleDOI
TL;DR: In this paper, a weight function based on the Boundary Collocation Method is applied to derive stress intensity factors and compliance in three-point bending tests for a wide range of specimen geometries.

Journal ArticleDOI
TL;DR: In this paper, high-resolution experimental measurements of near-tip fatigue crack parameters are directly compared with independent high resolution elastic-plastic finite element simulations of growing fatigue cracks, and proper normalizations are identified to compensate for different material properties, crack geometries, and applied stress levels.

Journal ArticleDOI
TL;DR: In this paper, a three-dimensional finite-element analysis in conjunction with the equivalent domain integral was used to calculate stress intensity factors (SIF) for surface or corner cracks emanating from a semicircular notch in a tension specimen.

Journal ArticleDOI
TL;DR: In this article, beam theory and the J-integral and the principle of superposition in a linear elastic body were used to calculate the mode I and mode II stress intensity factors in a generic cracked adhesive sandwich.