Circular holes under remote tensile load: From experiments to FFM theory
A. Sapora1*, A.R. Torabi2, P. Cornetti1
1 Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy
2 Fracture Research Laboratory, Faculty of New Sciences and Technologies, University of Tehran, PO Box 14395‐
1561, Tehran, Iran
*corresponding author: alberto.sapora@polito.it
Abstract
In this work, the brittle failure initiation from a circular hole in an infinite plated under uniaxial tension is investigated. By keeping low (≤0.1) the hole diameter to specimen width ratio in order to reproduce an infinite geometry, GPPS and PMMA notched samples are tensile tested at a strain rate equal to 1 mm/min. Four different hole sizes and three different specimens are considered for each material, for a total of 24 tensile tests carried out. The recorded failure loads are interpreted through the coupled Finite Fracture Mechanics (FFM) criterion, by assuming a symmetric crack propagation and exploiting the analytical relationships for the stress field and the stress intensity factor (SIF) functions available in the Literature. The comparison between experimental data and FFM predictions reveals to be more than satisfactory (Fig. 1).
Fig. 1. Tensile tests on circularly notched samples: FFM failure stress vs. experimental data (GPPS and PMMA)
