Abstract
The paper aims to examine the suitability of the strain energy density criterion in predicting the fracture behavior of blunt V-notched specimens under compression load. Recent studies on local stress fields have shown that the strain energy density, averaged over a specific control volume which embraces the notch round border, could be a robust parameter in the brittle fracture assessment of several materials. A set of experimental results recently published in the literature on compressive brittle fracture of V-notched specimens made out of polymethyl methacrylate has here been considered. Finite element analyses have been performed on plane strain condition and experimental data have been summarized by means of the SED criterion. It has been shown that the proposed criterion permits a satisfactory evaluation of the fracture load of polymethyl methacrylate specimens weakened by notches having different opening angles and radii.
Highlights
IntroductionThe two main groups of stress concentrators in components and structures are cracks and notches
A literature survey indicates that brittle fracture investigations in components containing stress raisers under compression are limited to notched members
The most recent works on compressive brittle fracture of notched members are those published by Ayatollahi et al and Torabi et al [5, 6] in which the PS and MS fracture criteria have been successfully employed for predicting the fracture loads of two new V-notched test specimens, called the V-notch stepped cottage (VSC) and the flattened V-notched semidisk (FVSD) specimens, made of polymethylmethacrylate (PMMA), for various notch angles and different notch radii
Summary
The two main groups of stress concentrators in components and structures are cracks and notches. A literature survey indicates that brittle fracture investigations in components containing stress raisers under compression are limited to notched members. The first use of the notch fracture mechanics principles in compressive brittle fracture prediction of notched components has probably been made in [3] They have recently investigated the fracture behavior of graphite specimens weakened by double V-notches with end holes (VO-notches) both experimentally and theoretically by means of the average strain energy density (SED) criterion. Good agreement has been found between numerical predictions and the experimental results, demonstrating that the proposed criterion works well on compressive brittle fracture of VO-notched graphite specimens, and on that of blunt V-notched PMMA specimens
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