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。

youdao

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。

youdao

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.

这家人住在白山的大峡谷里，这里终年狂风呼啸，冬天更是冷得彻骨。

youdao

Fitch, a ratings agency, recently downgraded the debts of Panasonic and Sony to one notch above junk status and placed Sharp's on negative outlook.

ECONOMIST: Japanese manufacturing