Computational Mechanics and Design Group

Department of Civil & Structural Engineering

Research Seminar - On the use of the Theory of Critical Distance to estimate the loading rate effects on notched 6063-T5 aluminium alloy

Date/time

26/03/2014 - 16:00 to 16:30

Speakers

Taixiang Yin

Venue

MAPP-LT08

About the event

An investigation on the use of a reformulated Theory of Critical Distances (TCD) to predict the fracture of notched 6063-T5 aluminium alloy subjected to high rate of loading at room temperature. This theory has been used to predict static and fatigue problems successfully by assuming the linear-elastic behaviour in the vicinity of notch tip during last decades. The purpose of this research is to explore if the TCD methods are still capable of predicting dynamic failure of metallic materials in the presence of notches. The cylindrical samples containing three different geometrical features were tested under both quasi-static and high rate of loading. The ultimate tensile strength and fracture toughness change as the loading rate varies, rather than keep constant in static condition. By using the experimental results and directly post-processing the result of linear elastic finite element analysis (FEA), such methodology has been approved as an accurate and reliable approach to estimate the dynamic failure stress within an error interval of about . After the validation process, the estimative power of this group of theories is capable of predicting fracture problem subjects to high rate of loading, which is very exciting, because the linear-elastic TCD can be used to predict the complex dynamic problem successfully.