Brittle Fracture Initiation Characteristics of Three-dimensional Welded Structure Containing a Crack

Crack initiation in brittle materials

In this paper we study the crack initiation in a hyper-elastic body governed by a Griffith’s type energy. We prove that, during a load process through a time dependent boundary datum of the type t → tg(x) and in absence of strong singularities (this is the case of homogeneous isotropic materials) the crack initiation is brutal, i.e., a big crack appears after a positive time ti > 0. On the cont...

Crack Growth during Brittle Fracture

Title: Crack Growth During Brittle Fracture in Compression. Author: Bartlett W. Paulding, Jr. Submitted to the Department of Geology and Geophysics February 9, 1965 in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology. Photoelastic analysis of several two-crack arrays predicts that compressive fracture is initiated at cra...

Towards the treatment of boundary conditions for global crack path tracking in three-dimensional brittle fracture

The aim of the present paper is a systematic elab1 oration of a three dimensional finite element analysis tool for 2 discontinuous fracture in brittle solids. Brittle or quasi-brittle 3 fracture usually occurs when a material reaches the limit of its 4 strength and no plastic deformation has been observed prior 5 to failure. In the present approach, this kind of failure is char6 acterized by th...

Identifying crack initiation and propagation thresholds in brittle rock

Recent work at the Underground Research Laboratory of Atomic Energy of Canada Limited in Pinawa, Manitoba, has shown that high compressive stresses near the tunnel face significantly contribute to the loss of strength, and eventual failure of the rock, through stress-induced brittle fracturing. A program of laboratory testing has been undertaken to investigate the effects of brittle fracture on...

Brittle fracture characteristics of a 50 mm boron containing HSLA steel