It is concluded that the local tensile stress created during quenching process and the stress concentration due to sharp V-shaped notch are the primary reasons of cracking.
认为，淬火过程中产生的局部拉应力加上尖锐V型槽口引起的应力集中是造成开裂的主要原因。
2
He cut a notch in the stick with a sharp knife.
他用一把利刀在手杖上刻了个凹槽。
3
This family was situated in the 2 Notch of the 3 White Hills, where the wind was sharp throughout the year, and pitilessly cold in the winter.