Showing papers in "Engineering Fracture Mechanics in 2006"

TL;DR: In this paper, a comprehensive study was carried out on series of nanocomposites containing varying amounts of nanoparticles, either titanium dioxide (TiO 2 ) or aluminium oxide (Al 2 O 3 ).

TL;DR: In this paper, the discrete cohesive zone model (DCZM) is implemented using the finite element (FE) method to simulate fracture initiation and subsequent growth when material non-linear effects are significant.

TL;DR: In this paper, different nanoparticles, such as fumed silica and carbon black, were used to optimise the epoxy matrix system of a glass-fibre-reinforced composite.

TL;DR: In this article, a bilinear cohesive zone model (CZM) is employed in conjunction with a viscoelastic bulk (background) material to investigate fracture behavior of asphalt concrete.

TL;DR: In this article, an alternative exponential cohesive zone law, derived from the law of Xu and Needleman, is presented, which correctly describes mixed-mode decohesion, based on investigations of the influence of the coupling parameters and the assessment of the work-of-separation under mixedmode conditions.

TL;DR: In this paper, the authors introduce a new failure criterion in the framework of finite fracture mechanics, which relies on the assumption that the finite distance is not a material constant but a structural parameter.

TL;DR: In this paper, the authors used a cohesive-zone approach to model the mixed-mode fracture of adhesive joints made from a polymer-matrix composite and obtained the mode-II cohesive zone parameters using sandwich end-notch flexure specimens.

TL;DR: A review of recent developments in the area of fretting fatigue can be found in this article, where the importance of the size effect is highlighted and an analogy is made between fretting and notch fatigue.

TL;DR: In this paper, a systematic evaluation of six ductile fracture models is performed to identify the most suitable fracture criterion for high velocity perforation problems, including the Wilkins, the Johnson-Cook, the maximum shear stress, the modified Cockcroft-Latham, the constant fracture strain, and the Bao-Wierzbicki fracture models.

TL;DR: In this article, a finite element model is used to reproduce the cracking progression in the unreinforced and 3D reinforced T-joints provided that the action of the through-the-thickness reinforcement is modelled by discrete nodal forced placed so as to replicate the physical reality.

TL;DR: In this article, an extended finite element method (X-FEM) was used to solve complex three-dimensional industrial fracture mechanics problems through combination of an object-oriented (C++) research code and a commercial solid modeling/finite element package (EDS-PLM/I-DEAS®).

TL;DR: In this article, the importance of the cohesive-zone approach to analyze localisation and fracture in engineering materials is emphasised and ways to incorporate the cohesive zone methodology in computational methods are discussed.

TL;DR: In this article, the authors extend a previous analysis which was developed for mode I delamination cases where significant bridging and micro-cracking occurred, and propose an approach that utilises an effective crack length and if successful, may eliminate the need to measure this parameter experimentally.

TL;DR: In this paper, a method for the identification of deformation, damage and fracture properties of ductile materials is presented. And the identified material parameters are validated by independent tests on notched tensile specimens.

TL;DR: In this article, a mixed-mode crack propagation model based on linear elastic fracture mechanics (LEFM) was developed, where a domain is first divided into a few subdomains and a remeshing procedure as simple as in boundary element methods was developed with minimum mesh changes whereas the generality and flexibility of the FEM is well maintained.

TL;DR: In this paper, a simple, efficient algorithm is proposed to trace a moving delamination front with an arbitrary and changing shape so that delamination growth can be analyzed by using stationary meshes.

TL;DR: In this paper, an end-notched flexure Pinus pinaster wood specimen was used to validate a data reduction method based on the equivalent crack concept, in order to avoid well-known difficulties in monitoring crack propagation.

TL;DR: In this article, the authors considered the problem of plane-strain fluid-driven fracture propagating in an impermeable elastic medium under condition of large toughness or, equivalently, of low fracturing fluid viscosity.

TL;DR: In this article, a novel approach is proposed for the determination of mixed mode cohesive laws for large scale crack bridging problems based on a plane, two-dimensional analysis utilizing the J integral applied a double cantilever beam specimens loaded with uneven bending moments.

TL;DR: In this paper, a new general mixed-mode brittle fracture criterion based on the concept of maximum potential energy release rate (MPERR) was proposed, which can be easily degraded to the pure-mode fracture criterion and can also be reduced to the commonly accepted fracture criteria for the mixedmode I/II state.

TL;DR: In this article, the authors quantify the influence of defect on the fatigue limit and show that the gradient of the hydrostatic stress is a good parameter to characterise the influence on fatigue behavior.

TL;DR: In this article, rate-sensitive and triaxiality-dependent cohesive elements are used to simulate crack growth under quasi-static and dynamic loading conditions for a middle-cracked tension M(T) specimen made of an aluminum alloy.

TL;DR: In this article, a triaxiality dependent damage model is used to represent the multiaxial creep ductility of the material and an analytical model to predict steady state crack growth in terms of the fracture parameter C∗, designated the NSW-MOD model, is presented.

TL;DR: In this article, the energy release rate approach is applied to describe the delamination growth rate in a fiber metal laminate such as Glare, which is accompanied by delamination at the interface between the aluminium and glass fibre/adhesive layers.

TL;DR: In this article, a cohesive interface model formulated within the framework of damage mechanics is presented for the simulation of decohesion in adhesively bonded assemblies, where a single energy-based damage variable is introduced for describing the damage state of the interface.

TL;DR: In this article, a new computational method based on the equivalent domain integral (EDI) is developed for mode I fracture analysis of orthotropic functionally graded materials (FGMs) subjected to thermal stresses.

TL;DR: In this article, the Weibull stress criterion is applied to correct the CTOD for constraint loss, which leads to an equivalent CTOD ratio, β, defined as β = δ/δWP, where δ and δWP are CTODs of the standard fracture toughness specimen and the structural component, respectively.

TL;DR: In this paper, two numerical models, namely an R -curve approach based on the crack tip opening angle (CTOA) and a cohesive model, are compared regarding their ability to predict ductile crack extension in thin aluminium sheets, which can be simulated under the assumption of plane stress.

TL;DR: In this paper, the authors investigated the fatigue crack growth behavior in a stiffened thin 2024-T3 aluminum panel repaired with one-sided adhesively bonded composite patch through experiments and analyses.

TL;DR: In this paper, a finite element model based on the molecular mechanics theory is proposed to investigate the fracture progress in Zig-Zag and Armchair carbon nanotubes with defects under uniaxial tensile stress.