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華擎送件.
汽車曲軸端鎖固螺絲, 疲勞壽命不足而送來分析. Crank nose bolt. Fatigue fracture.
起裂: 照片下方一整個圓弧(~150度)都是起裂源點(稱多源起裂). 往上緩慢前進. 照片右上方暗色區域是驟裂區.
輥牙皺摺是破裂起裂的元凶. 會有皺折是因為輥牙校模沒弄好.
Poor tool setup before thread rolling resulted in these laps that served as existing microcracks to start a fatigue fracture.
流線都亂掉了! See the turbulence of the flow lines.
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