短语词组短语creep -fatigue life 蠕变疲劳寿命creep and fatigue tests 蠕变和疲劳试验creep and fatigue 蠕变combined creep and fatigue 复合蠕变疲劳creep and fatigue interaction 蠕变cumulative creep -fatigue damage 疲劳损伤;积累蠕变;累积蠕变 返回 creep fatigue