最后断裂 meaning in English

eventual failure
final fracture

The crack model of ti - 2al - 2 . 5zr is proposed as follows : ( a ) hydrogen diffuse to the crack tip under applied stress ; ( b ) precipitation of hydride ; ( c ) crack propagation by hydride and precipitation through autocatalytic process ; ( d ) repeat the former steps ; ( e ) final fracture
该合金氢致延迟断裂的机理为： h ）氢在应力作用下向裂纹尖端扩散；（ b ）在裂纹尖端形成氢化物并长大： k ）主裂纹沿氢化物扩展； m重复h人比、（ c ）； k ）最后断裂。
And finally , sem has been used to characterize the fracture . the results indicate that the relationship between the fatigue lifetime and cyclic plastic strain range obeys coffm - manson relation , and the relation between the hysteresis energy ( wn ) and the plastic strain range ( p ) can be described by a power - law : wh = h pw
但在室温下， r向及t向试样具有相同的循环特性，均表现为随应变幅的不同而不同，当应变幅高于0 . 8时，呈现出先循环硬化而后循环软化直至最后断裂的现象。