高层建筑用铝合金板材疲劳寿命分析  

Fatigue life analysis of aluminum alloy sheet used in high-rise building

作　　者：王艳[1] 侯飞[2] WANG Yan;HU Fei(Shanxi Polytechnic College,Taiyuan 030000,China;Shanxi Datong University,Datong 030000,China)

机构地区：[1]山西职业技术学院,山西太原030000 [2]山西大同大学,山西大同030000

出　　处：《兵器材料科学与工程》2022年第2期124-128,共5页Ordnance Material Science and Engineering

基　　金：山西省大同市科技高新技术项目(2019026)。

摘　　要：以高层建筑常用的6061-T6铝合金为试验对象,通过激光冲击强化铝合金表面提升其表面质量,在不同应力比与板厚下,用最小二乘法与幂函数处理铝合金疲劳试验数据,并利用电液伺服系统分析其疲劳寿命。结果表明:应力比不变时,随应力的提升,铝合金板的疲劳寿命下降;最大应力相同时,应力比越大,铝合金疲劳寿命越大,即提升应力比可延长铝合金疲劳寿命;板厚大于30 mm时,在应力场作用下,铝合金裂纹扩展速率加快,板材越厚,疲劳寿命越短;提升激光能量,可降低铝合金裂纹扩展速率,增加激光冲击次数,可延长其疲劳寿命,缩短裂纹长度,冲击次数为2次、激光能量为7.36 J为最佳激光参数组合。Taking 6061-T6 aluminum alloy commonly used in high-rise buildings as the test object,the surface of aluminum alloywas treated by laser impact strengthening instrument to improve the quality of aluminum alloy. Under different stress ratio andplate thickness,the fatigue test data of aluminum alloy were processed by least square method and power function,and thefatigue life of aluminum alloy was analyzed by electro-hydraulic servo system. The results show that when the stress ratio isconstant,the fatigue life of aluminum alloy plate decreases gradually with the increase of stress. When the maximum stress levelis the same,the greater the stress ratio is,the greater the fatigue life of aluminum alloy is,that is,increasing stress ratio canprolong the fatigue life of aluminum alloy. When the plate thickness is more than 30 mm,the crack growth rate of aluminumalloy obviously accelerates under the action of stress field strength. The thicker the plate is,the shorter the fatigue life ofaluminum alloy is. Increasing the laser energy can reduce the crack growth rate of aluminum alloy,and increasing the laserimpact times can prolong the fatigue life of aluminum alloy and shorten the crack length. The best laser parameter combination isthe impact times of twice and the laser energy of 7.36 J.

关 键 词：高层建筑 铝合金板材 疲劳寿命 最小二乘法 幂函数 

分 类 号：TG335.1[金属学及工艺—金属压力加工]