摘要
以连续损伤力学(continuum damage mechanics)理论为基础,针对铸造起重机主梁在中温及组合应力状态下的疲劳-蠕变损伤进行了研究。通过对Q235试件的中温疲劳试验,分别对扭转与拉伸状态下的铸造起重机主梁平均应变进行了分析,推导出了中温状态下的铸造起重机主梁在组合应力状态下的疲劳-蠕变损伤交互作用的损伤模型。在此基础上,研究了铸造起重机箱型梁在损伤后的有效截面尺寸分配原则和计算依据。通过Q235试件拉伸与扭转试验,证明该疲劳-蠕变损伤模型与试验数据符合度较高。通过180/50t铸造起重机工程验证,表明该模型具有较好的寿命预测能力。
Based on the continuum damage mechanics, under the compound stress status, for the casting crane girder fatigue-creep damage at medium temperature has been studied. The medium temperature fatigue test in Q235, on the average strain torsion and tension are analyzed. Under the compound stress status, a new damage model for casting crane girder at the medium temperature has been developed for fatigue-creep interaction. Based on the model, how to define the casting crane box girder after damage ef- fective section size distribution and basis of calculations has been discussed. Proved by experiment, the fatigue-creep damage model and the experimental data with higher degrees. The engineering validation of the 180/50t casting crane has a good predic- tion ability of the model.
出处
《现代制造工程》
CSCD
北大核心
2015年第9期7-12,47,共7页
Modern Manufacturing Engineering
基金
国家自然科学基金资助项目(51275329)
国家十二五科学技术支持计划项目(2011BAK06B05)
太原科技大学校青年基金项目(20113014)
关键词
铸造起重机
应力组合
疲劳损伤
蠕变损伤
损伤变量
casting crane
stress combination
fatigue damage
creep damage
damage variable
