某型汽车起重机起重臂的应力和应变疲劳寿命预估  

FATIGUE LIFE PREDICTION FOR A TRUCK CRANE BOOM BASED ON STRESS AND STRAIN LIFE PREDICTION MODELS

作　　者：郑钰琪[1] 王三民[1] 王燕平[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《机械强度》2013年第6期850-854,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金资助项目(50875210)~~

摘　　要：以某型现役汽车起重机起重臂钢结构为研究对象,基于单位载荷下的名义应力谱和FE-SAFE(durability analysis software for finite element models)耐久性分析软件,建立起重臂钢结构件的应力及应变疲劳寿命预估模型,给出该材料的应力及应变寿命曲线,并分别采用应力、应变疲劳损伤模型,对该型起重臂钢结构的疲劳寿命进行预算。预算结果表明该型起重机起重臂结构工作30 978个循环时出现裂纹,而其使用寿命为392 699个工作循环。计算结果与试验结果对比得出:两种寿命预估模型结果与试验值基本符合,故该型现役起重机检修周期和使用寿命的制定应采用两种疲劳寿命预估模型综合考虑。Taking a certain truck crane in service as the research object, the authors established stress and strain fatigue life prediction models for the crane boom＇ s steel structure based on the nominal stress spectrum under unit load and FE-SAFE （durability analysis software for finite element models） durability analysis software, got the material＇ s stress-life and strain-life curves,also used these two models to predict the fatigue life of the crane boom＇ s steel structure respectively. The estimated results show that the usable life of this crane boom is about 392 699 working cycles, and the crack may appear after about 30 978 cycles. Comparing estimated with experimental results we can get that the results of these two life fatigue prediction models are almost in line with experimental value, so for the determination of this crane＇ s maintenance cycle and service life it is better to combine these two fatigue life prediction models.

关 键 词：起重臂 应力疲劳 应变疲劳 寿命预估 FE-SAFE 

分 类 号：TH213.6[机械工程—机械制造及自动化]