Nanoindentation stress-strain for Fracture Analysis and computational modeling for hardness and modulus

TL;DR

This paper investigates nanoindentation stress-strain behavior to analyze fracture phenomena, introduces a new shape factor approach for crack analysis, and models hardness and modulus responses through polynomial fitting.

Contribution

It presents a novel shape factor method for fracture analysis and explores polynomial fitting of hardness and modulus in nanoindentation studies.

Findings

Transition from ductile to brittle fracture with increased load

Shape factors effectively characterize crack branching and micro-cracking

Polynomial coefficients modulate hardness and modulus responses

Abstract

Stress-strain plots based on nanoindentation load-depth curves reflected cracking phenomenon. A transition from ductile to brittle fracture was observed on increasing the depth or load of indenter penetration. A new approach with shape factors in the fracture studies based on radial crack branching and micro-cracking was done. Hardness and modulus plots were fitted with polynomials. The coefficients were varied to obtain different hardness and modulus responses.