大部分形状记忆合金只能“循环”(或称改变形态)有限次数，之后材料就会疲劳了。
Most shape memory alloys can only "cycle" (or change form) a limited number of times before the material gives out.
疲劳破坏是材料在变形过程中产生的裂纹积累。
Fatigue failure results from accumulation of cracks of deformation pro - cess of material.
新材料不仅具有耐油性，在耐高温性、耐疲劳性和抗永久变形性方面也有较大幅度的提高。
The new material is not only oil resistant, but also has fairly great improvement in performance of high temperature resistance, fatigue resistance and permanent deformation resistance.
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