Cast aluminum alloy casing. Fatigue crack started from micro-shrinkage pores at the root of the boss. The arrows show the direction of crack propagation.
Below: Aqua arrows pointing to crack origin---boss.


Cast aluminum alloy casing. Fatigue crack started from micro-shrinkage pores at the root of the boss. The arrows show the direction of crack propagation.
Below: Aqua arrows pointing to crack origin---boss.


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