Nodular Cast Iron – Fatigue Crack Measurement and Simulation

Abstract

Study presented in this paper is concerned with fatigue crack initiation detection, crack propagation observation and measurement as well as with numerical simulation of damage accumulation and propagation in the nodular cast iron grade EN-GJS-400-18-LT. Material properties of nodular cast iron are well elaborated in previous authors' papers. Crack initiation and its propagation observation as well as crack length measurement is performed on standardized specimens using ARAMIS 4M optical system. Based on the experimental results, a new three-dimensional constitutive model is proposed to simulate the low-cycle fatigue behaviour of considered material. An efficient algorithm for modelling cyclic plasticity is used for performing numerical simulation of crack initiation and growth on standardized specimens made from nodular cast iron. The computational procedure accuracy is verified by comparing the computed results with the real experimental data.

Crack Tip Position Determination Using Infrared Thermography and Digital Image Correlation

“…In addition, the paper is concerned with numerical simulation of damage accumulation and propagation in the mentioned material. Material properties of nodular cast iron are well elaborated in previous authors' paper [6,7]. An algorithm which enables numerical modelling of cyclic plasticity behaviour of nodular cast iron is proposed by Čanžar in [8].…”