Recently published data for fracture in human humeral cortical bone are analyzed using cohesive-zone models to deal with the nonlinear processes of material failure. Such models represent the nonlinear deformation processes involved in fracture by cohesive tractions exerted by the failing material along a fracture process zone, rather than attributing all damage to a process occurring at a sing...

We present a borehole failure model which is based on fracture mechanics and layer buckling theories and compare its prediction with experimental data. The model assumes that the main mechanism of borehole collapse takes place in the form of layers buckling near the borehole surface. The model introduces a combination of fracture mechanics parameters with dimension of length that scale the size...

The purpose of this study was to investigate and analyse the fracture toughness of yttria stabilized tetragonal zirconia polycrystal (Y-TZP) dental ceramics by means of the Vickers indentation technique. Fracture toughness was analysed under the following loads: 29.42 N, 49.03 N, 196.13 N, and 294.20 N. Cracks that had developed from the vertices of a Vickers indentation were measured and used ...

INTRODUCTION: One of the most important properties of implant materials for joint arthroplasty is their wear resistance. Because of their excellent wear properties, ceramic materials have found application in particular in total hip arthroplasty; however, brittle failure remains a serious problem. Basic research has thus been focused on nacre, a natural composite consisting of imbricated aragon...

Interface reliability issue has become a major concern in developing flip chip assembly. The CTE mismatch between different material layers may induce severe interface delamination reliability problem. In this study, multifunctional micro-moiré interferometry (MI) system was utilized to study the interfacial response of flip chip assembly under accelerated thermal cycling (ATC) in the temperatu...

[1] A size effect law for fracture triggering in dry snow slabs of high enough length-tothickness ratio is formulated, based on simplified one-dimensional analysis by equivalent linear elastic fracture mechanics. Viscoelastic effects during fracture are neglected. The derived law, which is analogous to Bažant’s energetic size effect law developed for concrete and later for sea ice, fiber compos...

OBJECTIVE To compare wear performance and resistance to crack propagation (K1C) of commercial restorative materials and their flowable variations. A potential correlation between three-body wear and fracture toughness, modulus of elasticity, fracture work, Vickers hardness, and filler content was investigated. METHOD AND MATERIALS Seven restoratives (five composites, one ormocer, and one comp...

Concrete is a quasi-brittle building material that has low tensile strength. The process of its destruction under loading inhomogeneous, due to the nature concrete structure mass, consisting components with different physical and mechanical properties. Gradual deformation can be characterized as formation development microcracks. presence different-sized in makes it possible consider multi-leve...