The fatigue fractography consists of several different zones, including fatigue crack initiation, slow, fast propagation and final fracture.
疲劳断口上存在典型的疲劳裂纹萌生区、缓慢扩展区、快速扩展区和最后瞬断区。
During fracture propagation driven by detonation gas in oil well, dynamic response of crack surface under the gas pressure results in fast fracturing.
油井爆生气体对岩石劈裂作用过程，是裂缝面对动态荷载响应并使其发生动态扩展的过程。
As an effective investigation technique, common-offset SH reflection method can be carried out fast in the field and easy to detect caves and underground karst fracture zones.
作为一种有效的探查技术，等偏移横波(SH)反射法具有探测迅速，易于探测土洞、地下岩溶裂隙带的特点。
A higher distortion temperature, elongation and fracture toughness, effectively preventing the production and use of products in the cracking, a fast curing the characteristics.
具有较高的热变形温度、断裂延伸率和冲击韧性，有效防止了制品在生产和使用中的开裂，同时具有固化快的特点。
Then the azimuth of formation fractures is estimated; and with the joint use of zero offset P wave source VSP data, fast and slow shear wave seismograms are obtained to have fracture density.
在获得地下裂隙方位角的同时，结合零偏纵波VSP资料得到快、慢S波记录，进而计算了裂隙密度。
Then the azimuth of formation fractures is estimated; and with the joint use of zero offset P wave source VSP data, fast and slow shear wave seismograms are obtained to have fracture density.
在获得地下裂隙方位角的同时，结合零偏纵波VSP资料得到快、慢S波记录，进而计算了裂隙密度。
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