在阐述电磁继电器贮存寿命预测理论的基础上，选择了采用恒定应力加速寿命试验方法对电磁继电器进行试验及寿命预测。
Based on the expounding of the prediction theory for storage life of electromagnetic relays, the constant stress accelerated life test was introduced.
其次，对三城目安山岩和稻田花岗岩在恒定速率下进行循环加载卸载试验，得到了应力—应变曲线上很多点处的卸载曲线。
Next, unloading-reloading cycles are repeated in constant loading rate test with Sanjome andesite and Inada granite; and unloading curves at many points along stress-strain curve are obtained.
短寿命区采用四级恒定应力水平的成组试验法，长寿命区采用应力升降试验法。
The grouping test method at four constant stress levels was applied for short life span areas while the stress up and down test method were used for long life span areas.
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