The problem of elastoplastic stress singularity near the tip of V notch is studied.

研究了V型切口尖端的弹塑性应力奇异性问题。

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The effects of thickness and notch orientation on the toughness of X70 pipeline steel samples with V notch were investigated experimentally by use of the 3-point bending test at different temperature.

通过不同温度条件下不同厚度、不同缺口取向含V形缺口试样进行3点弯曲试验研究，发现X70管线钢具有严重的各向异性现象，其在平行钢板表面方向和沿钢板厚度方向力学性能差异较大。

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V-shaped notch blasting is that cutting slots with certain depth along axis -direction of the hole is determined according to the blast-crazing, and then load uncoupled charge and detonation.

形刻槽爆破是指在炮孔孔壁上按爆破开裂方向，切出一定深度的轴向对称V形槽，采用不耦合装药结构进行的一种断裂控制爆破。

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The zoo is also marking the mother lobsters with a "V" notch on their tails as a sign to fishermen, which lasts up to three years and should allow them a chance of greater breeding time.

BBC: NEWS | UK | Wales | North West Wales | Zoo ends lobsters' growing pains