Critical Stress Intensity Factor Determination for AZ61 Magnesium Alloy

M.A.M. Daud; Zainuddin Sajuri; Mohd Zaidi Omar; Junaidi Syarif

doi:10.4028/www.scientific.net/KEM.462-463.1121

Paper Titles

Surface Hardening of Aluminium-Copper Alloy 2011 by RF Plasma Nitriding Process
p.1097

Synthesis and Structural Consideration of Metal-Organic Framework (MOF) Coordination Polymer with Various Metal Linker Ratios
p.1103

Fracture Toughness and Fatigue Crack Growth Behavior of Rail Track Material
p.1109

Variable Amplitude Loading Strains Data Distribution Using Probability Density Function and Power Spectral Density
p.1115

Critical Stress Intensity Factor Determination for AZ61 Magnesium Alloy
p.1121

Hydro-Elastic Vibration of Partially Liquid-Filled or Partially Liquid- Surrounded Composite Cylindrical Shells
p.1127

Theoretical Investigation into the Wave Propagation in Rock with Single Fracture
p.1134

Strength Analysis for Shrink Fitting System Used for Ceramics Rolls in the Continuous Pickling Line
p.1140

Stress Intensity Factor of a Central Interface Crack in a Bonded Strip under Arbitrary Material Combination
p.1146

HomeKey Engineering MaterialsKey Engineering Materials Vols. 462-463Critical Stress Intensity Factor Determination for...

Critical Stress Intensity Factor Determination for AZ61 Magnesium Alloy

Abstract:

A stress intensity factor K was used as a fracture parameter to determine the plane strain fracture toughness KIC of AZ61 magnesium alloy using a single edge notch bend (SENB) specimen in accordance to ASTM E399 testing method. Five different specimen thicknesses of 2 to 10 mm were used in the test. A sharp fatigue pre-crack was initiated and propagated to half of specimen width at a constant crack propagation rate of about 1 x 10-8 m/cycle before the specimen was loaded in tension until the fracture stress is reached and then rapid fracture occurred. The fracture toughness KC values obtained for different thicknesses showed that KC value decreased with increasing specimen thickness. The highest KC value obtained was 16.5 MPa√m for 2 mm thickness specimen. The value of KC became relatively constant at about 13 MPa√m when the specimen thickness exceeds 8 mm. This value was then considered as the plane strain fracture toughness KIC of AZ61 magnesium alloy. Calculation of the minimum thickness requirement for plane strain condition and the size of the shear lips of the fracture surface validate the obtained KIC value.