Review of Damage Models for Environmentally Assisted Cracking on Metals

TL;DR

This paper reviews various damage models for predicting environmentally assisted cracking in metals, focusing on stress corrosion cracking mechanisms and the importance of SIF range in fatigue analysis.

Contribution

It provides a comprehensive overview of existing models, highlighting the unified approach that incorporates SIF range and corrosion effects for better prediction.

Findings

Unified approach recognizes SIF range as fatigue driving force

Corrosion contribution added via corrosion SIF

Models based on path dissolution, film rupture, and hydrogen embrittlement

Abstract

Stress corrosion cracking (SCC) is a form of failure in metals that is present mostly in systems where humidity contact and mechanical load play a key role. Therefore, prediction of the combined effect is desired. There are models based on path dissolution and film rupture, Hydrogen-embrittlement, based on empirical observations, and the unified approach which recognizes not the maximum applied stress intensity factor (SIF) but the SIF range as the fatigue driving force. So, in the later one, the contribution of corrosion to crack growth is recognized by adding a corrosion SIF.