Abstract
The effect of ageing on the mixed mode fracture toughness (I/III) was evaluated for the aluminium alloy AA2219 in limited underaged (LUA), underaged (UA) peakaged (PA) and overaged (OA) conditions. Opening mode fracture toughness (Mode I) test was conducted. Sheet tensile samples were prepared and tested in all the ageing conditions. Optical microscopy has been carried out and fractographic studies have been conducted to study and determine the mode of failure.
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