Considered is the interaction of macro-and micro-cracks in an anisotropic piezoelectric solid. The GreenÕs function and principle of superposition are used to formulate a system of singular integral equations for solving the unknown temperature discontinuity and elastic displacement-electric potential. The residual heat ̄ux, stress and electric displacement on the microcrack are evaluated direc...

A mesh refinement procedure designed for Digital Image Correlation analyses of cracked media is proposed, based on the pixel color an artificial case, and crack opening displacement field two experimental cases. Although evidence that this can improve every case if tiny elements are sought, it also shown size matrices consequently, computational cost be reduced while maintaining accuracy, espec...

This paper presents a part of development non-standard method for testing cylindrical test specimens measurement fracture properties pipeline materials. structures working under pressure is based on determining mechanics parameters SENT (Single Edge Notched Tension) and new PRNT (Pipe Ring specimens. In this work, both types required were manufactured from polyamide PA12 by using SLS (selective...

Veins in rocks have been studied for well over 150 years, initially driven by interest in how economically mineralised veins formed (e.g. Buckland, 1836; Hulin, 1929). Veins provide information on how fluids migrate through the crust, and how material is transferred by these fluids. Many studies have suggested that veins (including ‘crack-seal’ textured veins; Ramsay, 1980) form as a result of ...

Fatigue-crack-growth (FCG) rate tests were conducted on compact specimens made of an Inconel-718 alloy to study the behavior over a wide range in load ratios (0.1 6 R 6 0.95) and a constant Kmax test condition. Previous research had indicated that high R (>0.7) and constant Kmax test conditions near threshold conditions were suspected to be crack-closure-free and that any differences were attri...

Accurate estimation of fracture behavior of commercial LiMn₂O₄ particles is of great importance to predict the performance and lifetime of a battery. The present study compares two different microscale techniques to quantify the fracture toughness of LiMn₂O₄ particles embedded in an epoxy matrix. The first technique uses focused ion beam (FIB) milled micro pillars that are subsequently tested u...

A localization-induced cohesive model has been proposed for shear band evolution, crack growth, and fracture. Strain gradient theory has been applied to establish the criterion of the onset of localization and the governing equation in the post-bifurcation stage. Analytical solutions in one-dimensional case are used to establish the ‘‘traction-separation’’ law, in which strain gradient and mate...

Abstract The isothermal planar‐biaxial fatigue behavior was studied for two different disk batches of nickel‐base superalloy Inconel 718 using cruciform specimens at 400°C and 630°C under equi‐biaxial shear loading. Additionally, non‐proportional tests were performed. test results compared with uniaxial reference the von Mises equivalent strain hypothesis, a parameter critical plane, modified c...

Minimum energy paths for unit advancement of a crack front are determined by reaction pathway sampling, thus providing the reaction coordinates for the analysis of crack tip mechanics in ductile and brittle materials. We compare results on activation energy barrier and atomic displacement distributions for an atomically sharp crack in Cu, where one observes the emission of a partial dislocation...

The goal of the work presented here is to study dynamic crack initiation in ductile steels "NiÐCr steel and 293 stainless steel# at di}erent loading rates and to establish appropriate dynamic failure criteria[ A variety of infrared and visible optical methods and high!speed photography are used in this study[ Precracked steel specimens are subjected to dynamic three!point bend loading by impact...