Fracture Toughness of AZ61 Magnesium Alloy with Various Thickness

Mohd Ahadlin Mohd Daud; Nurulhilmi Zaiedah Nasir; Mohd Zulkefli Selamat; Sivakumar Dhar Malingam

doi:10.4028/www.scientific.net/AMM.761.479

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 761Fracture Toughness of AZ61 Magnesium Alloy with...

Fracture Toughness of AZ61 Magnesium Alloy with Various Thickness

Abstract:

The critical fracture toughness parameter K_ΙC of AZ61 magnesium alloy was determined on the three point bent specimens with notch designed according to ASTM E399 standard. Five specimens having different thickness, i.e., 2, 4, 6, 8 and 10 mm were considered in order to evaluate the effect on fracture toughness. The stress intensity factor range ΔK was constant ~1x 10^-8for every specimen until the critical crack length reached half of the width of the specimens. The fracture test was done with the speed rate 0.12-0.15 MPa√m/sec until the specimens broke. The experimental results showed that the critical plain strain fracture toughness K_ΙC is 12.6 MPa√m and the highest plain stress fracture toughness K_C is 16.5 MPa√m.