However, increasing loading rate will result in an increase of measured average crackvelocity.
但加载速率愈快，裂纹扩展实测平均速度愈高。
2
The increase in the crackvelocity of all materials in water environment is observed, but the degree is more remarkable for glass ceramics and zirconia.
所研究的材料在水环境下的裂纹扩展速度均加快，但玻璃陶瓷和氧化锆陶瓷材料更为明显。
3
Meanwhile, the influences of pipeline internal pressure, wall thickness, crack arrest length and initial crackvelocity on the crack driving force (crack propagation) are further studied.