Showing papers in "Theoretical and Applied Fracture Mechanics in 1988"

TL;DR: In this article, a simplification of classical physics and continuum mechanics that decouples thermal and mechanical effects is presented, and the existence of the isoenergy density function provides an elegant means of resolving the multidimensionality of the problem; the translation of unidimensional data to multidimensional states.

TL;DR: In this article, the time-dependent stress intensities due to quenching are calculated by the boundary element method for an array of parallel and equal spaced edge cracks in a long strip.

TL;DR: In this article, the resolved shear stress intensity coefficient in a crack solid, RSSIC, is defined, and the coefficients for the slip systems at a crack tip are evaluated from the calculated stress intensity factors.

TL;DR: In this paper, the analysis and testing of impact damage composite laminates are discussed, and it is shown that uniaxial S−N curves have a generic shape with a pronounced threshold level, and further research is needed to understand the physical reasons for such a threshold value.

TL;DR: In this article, the susceptibility to embrittlement during thermal ageing of the three classes of steel discussed is determined by the concentration of impurities, notably phosphorus, which is due to microstructural changes during heat treatment or ageing.

TL;DR: In this article, a semi-analytical finite element program is developed and used to solve for the transient stress and strain distribution from which contours of the volume energy density in the structure are obtained as a function of time.

TL;DR: In this article, the authors investigated the mechanics of propagation of a single crack in brittle and ductile samples of clay as well as their mode of failure and found that the angle of crack propagation α was greater in the brittle than in the ductile sample.

TL;DR: In this paper, the authors outline recent developments in the field of bonded repair technology, focusing on the extension of this technique, originally developed for thin metallic wing skins, to the repair of thick sections.

TL;DR: In this paper, the effect of the two-phase microstructure of an aluminum-silicon alloy on the propagation of fatigue-induced fracture was investigated using a computerized apparatus which applied four-point bending loads to test specimens inside the vacuum chamber of a scanning electron microscope.

TL;DR: In this article, the effect of pore size and pore volume fraction on strength in brittle solids is evaluated and the analysis considers that the strength degradaton of a solid containing a large number of spherical pores is due to a strong effect of porosity on Young's modulus.

TL;DR: In this article, the Bueckner weight function was used for computing the stress intensity factor using a 2D finite element program, and the results showed that plate length has little or negligible influence on fatigue strength provided that the plate length to thickness ratio is below 20 to 50 depending on the plate thickness.

TL;DR: In this article, a finite element code for large elastic deformations is used to evaluate the deformed shape of the rubber at crack growth initiation and a stability criterion based on the existence of a critical value of J in relation with the experimental results is discussed.

TL;DR: In this article, a method for determining residual stresses in elastic perfectly plastic material has been developed using Melan's shakedown theorem and a modified form of the Haar-Karman principle.

TL;DR: In this article, a center-cracked specimen was subjected to monotonically rising tensile load at the rate of dot σ = 4.14 GPa/s with an even increment increase of 69 MPa starting from 276 MPa.

TL;DR: In this article, an analytical approach using fracture mechanics and a numerical analysis assuming that the adhesive layers can be modelled by elastic springs with finite tensile strength was used to compare and discuss the delamination buckling and growth in compressively loaded layered composite plates.

TL;DR: In this article, the authors determined the critical crzes and crack growth characteristics for train car wheels and rails, and applied probabilistic fracture mechanics to analyze the behavior of transverse cracks in the rim of monobloc wheels, transverse head cracks in rails and aluminothermic rail welds.

TL;DR: In this article, a computer program for railway wheel life prediction was developed incorporating an elastoplastic calculation of both the residual stress field induced by shoe-braking and the superposed alternating rolling contact stresses.

TL;DR: In this paper, the design consideration manufacturing technology and inspection procedure for fiber-reinforced plastics (FRP) pressure vessels has been discussed, which involves theoretical analysis, material selection, mandrel design, tooling, processing know-how and proof tests.

TL;DR: In this article, a nonsymmetric cross-shaped crack in an infinite and isotropic solid subjected to a constant pressure is solved by applying a system of singular integral equations in Hilbert space.

TL;DR: In this article, the authors investigated the crack propagation in concrete by application of Linear Elastic Fracture Mechanics (LEFM) and the Boundary Element Method (BEM) for detecting the load level at which unstable crack initiation occurs in a notched beam under bending.

TL;DR: In this article, the interrelated effects of bulk carbon level, 0.4% to 0.8%, and yield strength on the threshold stress intensity value, K ISCC, of steels in a sea water environment were demonstrated.

TL;DR: A nonlinear hardening/softening relation is assumed between the resultant shear stress and shear strain for determining the state of affairs near the crack tip in this article, where Amplification of the local stress fields is obtained in terms of the material parameters by assuming that nonlinearity is confined to the immediate vicinity of a crack tip region.

TL;DR: In this article, a catastrophic failure of a wheel hub occurred during service, and the nature of failure was a corner crack emanating from a spoke hole, and an analytical investigation was carried out using the tool of Linear Elastic Fracture Mechanics to establish the cause of failure.

TL;DR: In this article, the authors employed the Hankel transform and Fourier series to obtain the stress intensity factor for a penny-shaped crack situated away from the midplane of a finite radius cylinder under torsion.

TL;DR: In this article, the authors present three analytical/experimental groups of methods developed by the author and his co-workers: isodyne methods, strain gradient methods and thermoelastic methods.

TL;DR: In this article, a particular solution of the hollow cylinder with one crack is presented, which consists of two parts: the first corresponds to a pair of equal and opposite normal and tangential concentrated forces acting on a crack in an infinite plane region and the second to distributed tractions on both crack surfaces such that the sum of the first and second parts satisfies the prescribed traction boundary conditions on the cracks and cylinder surfaces.

TL;DR: In this article, the influence of repeated impact loading on fatigue fracture of carbon spring En-42J steel is studied and a highly localized plastic deformation is observed at the time of impact.

TL;DR: In this article, the effect of very long intermittent hold times for low cycle fatigue and on transitory loads under normal service at elevated temperatures was investigated at 600°C for different fatigue saturation and creep stresses.

TL;DR: In this article, the weight function for a double notched strip of finite width is calculated by means of approximative crack opening displacement fields as well as by finite element computations.

TL;DR: In this article, it was shown that the behavior of propagating curved and branched cracks is inherently governed by the dynamics of the crack system provided that dissipation in the potential energy is accountedfor.