压力对Al-5.0Cu-0.4Mn合金疲劳塑性应变能的影响  

Influence of Pressure on the Elastic Strain Energy of Al-5.0Cu-0.4Mn Alloy in Low Cycle Fatigue

作　　者：程佩[1] 汪先送[1] 林波[1] 范建磊[1] 张卫文[1] 

机构地区：[1]华南理工大学机械与汽车工程学院

出　　处：《特种铸造及有色合金》2012年第8期743-746,共4页Special Casting & Nonferrous Alloys

基　　金：GD-NSFC联合基金项目(U1034001);国家科技支撑计划项目(2011BAE21B00);省部产学研重点专项(2009A090100026);广东省科技攻关项目(2008A010300003)

摘　　要：采用低周疲劳性能测试研究了不同压力对Al-5.0Cu-0.4Mn合金低周疲劳塑性应变能的影响。结果表明,不同压力下挤压铸造Al-5.0Cu-0.4Mn合金的塑性应变能密度均随着循环周次的增加而减小,并且压力越大,合金的塑性应变能密度下降的幅度越大;合金的塑性应变能密度跟循环应变幅的大小相关,同一应变幅下,压力下成形的合金塑性应变能密度更大;压力下塑性应变能密度差别在低寿命区比高寿命区大;压力越大,合金抵抗低周疲劳破坏的能力越好。Influence of applied pressure on the elastic strain energy of A1-5.0Cu-0.4Mn alloys prepared by squeeze casting was examined by low cycle fatigue testing. The results show that the elastic strain energy density of the alloys are decreased during the cycle process, and with the increase of applied pres- sure, elastic strain energy density is decreased. The strain energy density of the alloy is closely related to the degree of strain amplitude. The alloy prepared under pressure exhibits a larger strain energy density at the same strain amplitude. The difference of strain energy density in low fatigue life zone is larger than that in high fatigue life zone. Meanwhile, the low cycle fatigue life is longer with a higher pressure.

关 键 词：铝合金 低周疲劳 挤压铸造 塑性应变能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料]