The finite element method (FEM) is a widely used technique in research, including but not restricted to the growth of cracks engineering applications. However, failure use fine meshes poses problems modeling singular stress field around crack tip region. This work aims at using original source code program by Visual FORTRAN language predict propagation and fatigue lifetime adaptive dens mesh me...

Potential energy stored during the inter-seismic period by tectonic loading around faults is released earthquakes as radiated energy, frictional dissipation and fracture energy. The latter of first importance since it expected to control nucleation, propagation arrest seismic rupture. On one side, seismological estimated for natural (commonly called breakdown work) ranges between 1 J/m2 tens MJ...

The influence of the cohesive zone length on crack driving force is quantified and analyzed in a representative system particles dispersed matrix composite material. For heterogeneous material systems, e.g. particulate composites, it known that as approaches particles, may increase (shielding) or decrease (anti-shielding) depending relative stiffness particles. These results have been establish...

Metal-composite joints connecting conventional steel to an advanced fiber composite are an attractive structural system for hybrid ship hulls as well as aircraft frames. The objective of this study is to analyze the size effect on the strength of hybrid joints numerically, theoretically and experimentally. In the numerical analysis, linear elastic continuum elements are used for the composite a...

Recent studies document linear elastic response of muddy marine sediments to load and deformation on temporal and spatial scales relevant to animal movement, with burrowers making openings for movement in such sediments by fracture. Cracks propagate through linear elastic solids in mode I (opening-mode crack growth) when the stress intensity factor (KI) at the crack tip exceeds the material’s f...

We investigate the validity of the linear elastic fracture mechanics approach to dynamic fracture. We first test the predictions in a lattice simulation, using a formula of Eshelby for the time-dependent stress intensity factor. Excellent agreement with the theory is found. We then use the same method to analyze the experiment of Sharon and Fineberg. The data here are not consistent with the th...

The purpose of this research was to present a simulation modelling crack propagation trajectory in linear elastic material subjected mixed-mode loadings and investigate the effects existence hole geometrical thickness on fatigue growth life under constant amplitude loading. For various geometry thickness, (I/II) studies were carried out utilize single edge cracked plate with three holes compact...

Large scale laboratory experiments on size and rate effects the fracture of warm columnar freshwater ice have been conducted with floating edge-cracked rectangular plates loaded at crack mouth. The largest test plate had dimensions 19.5m x 36m. overall crack-parallel dimension covered a range 1 : 39 , possibly for tested under conditions. loading rates applied led to durations from fewer than 2...

The equivalent linear elastic fracture model based 0:;': an R-curve (a curve characterizing the variation of the critical energy release rate 'WIth the crack propagation length; IS generalized to describe both the rate effect and size effect observed in concrete. rock or other quasi brittle matenals. It is assumed that the crack propagation velocity depends on the ratio of the stress intensity ...

Fatigue and monotonic test specimens having porosity ranging from microto macroscopic levels were cast from 8630 steel. Monotonic and fatigue properties were obtained to determine the effect of porosity on the mechanical performance of the cast steel. Axial fatigue tests were conducted under fully reversed conditions in both strain and load control on specimens containing microporosity, and in ...