黃色箭頭為裂口蔓延方向.
緩裂 ---> 海灘紋, 貝殼紋.
驟裂 ---> 輻射紋
下:
Above: Crack radiates from an origin, leaving radiating markings characteristic of an abrupt fracture. 驟裂特徵: 輻射紋
Below: Crack origins: 2 sites. No. 1 : site A, tension area beneath induction-hardened case. No. 2: site B, appeared a few milli-seconds after A. 斷裂曲軸 起裂點 是硬化層(壓應力區)下的A點(拉應力區).
下: 轉角處+刀痕 為疲勞紋(緩裂)之裂源. Origin.
Test post.
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