split crack

Concrete and masonry is weak in tension and crack when the tensile strain is of the order of 0.000 2~ 0.000 5, the dangerous section of split is very dangerous.

砼及砌体抗压强度高，抗拉强度很低，极限拉应变约为0.0002～0.0005，危险截面是脆性破坏，因此裂缝的出现和开展是危险的。

A small tree in a crack may have the power to split the rock.

生长在石缝中的小树有劈开石头的力量.

The stress of the resistance to split in Z direction is not totally compressive stress, and tensile stress consists in crack round the center line of load applied, both bring the collective effect to the test piece of the resistance to split.

抗劈裂试件Z方向的应力不完全是压应力，在荷载施加的中心线裂痕附近有拉应力的存在，两者对试件劈裂破坏产生共同的作用。

A sharp report like the crack of a rife bullet split the air.

爆竹声忽然响起来,空中现了火花.

The mechanism on the formation of the through crack between shotholes in directional-split rock blasting with slotted charge is stated, the method for calculating blasting parameters presented based on the mechanism, and the first-in and advantage of this blasting technique are roundly analyzed.

论述切缝药包岩石定向断裂爆破炮孔间贯通裂纹的形成机理，提出相应的爆破参数计算方法，并对这一技术的先进性与优越性进行全面分析。

To solve this problem, the article chose the criteria based on the theory of stress intensity factor as the criteria of the crack split by using the fracture mechanics theory of concrete and considering the singularity on the crack tip.

针对这一问题，本文运用混凝土断裂力学理论，充分考虑裂缝尖端的奇异性，采用基于应力强度因子的断裂准则，作为裂缝开裂的评判标准。