Pre-notched dog bone small punch specimens for the estimation of fracture properties

TL;DR

This paper explores the use of pre-notched dog-bone small punch specimens to estimate fracture properties of metallic materials, focusing on how different confinement levels affect these properties.

Contribution

It introduces a novel approach using dog-bone-shaped specimens with varying confinement levels for fracture property estimation in small punch tests.

Findings

Fracture properties vary with confinement levels.

Optimal confinement levels improve estimation accuracy.

Method applicable to materials with limited sample availability.

Abstract

In recent years, the pre-notched or pre-cracked small punch test (P-SPT) has been successfully used to estimate the fracture properties of metallic materials for cases in which there is not sufficient material to identify these properties from standard tests, such as CT or SENB specimens. The P-SPT basically consists of deforming a pre-notched miniature specimen, whose edges are firmly gripped by a die, using a high strength punch. The novelty of this paper lies in the estimation of fracture properties using dog-bone-shaped specimens with different confinement levels. With these specimens, three confinement variations have been studied. The results obtained enable the establishment of a variation of fracture properties depending on the level of confinement of each miniature specimen and selection of the most appropriate confinement for this goal.