The Width and Height of Striation in Fatigue of 2017-T4 Al Alloy under Two Step Loading condition(Fatigue 1)

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This paper investigates striation configuration(H/s) under 2-step loading condition. Here, H is striation height and s is striation width. Under condition that vary from low maximum load to high maximum load, no acceleration of crack growth was visible, further H/s remained similar to values found under constant max. load. When load varied from high to low, retardation appeared immediately after varying the load. Striation configuration immediately after varying the load either flat or the H/s value dropped remained to a level much smaller than that under constant max. load. Once crack growth reached about 500μm, striation configuration recovered from the previous flat condition and the H/s value returned to the value found under constant max. load.

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