micky发表于2012-9-709:37
NorrisLandzbergmodel是温度循环的模型。
micky说得不错,另外也看到你在下面这贴子里有回复温度冲击的加速因子的计算
贴子里@fukit兄的在上贴9楼:JESD94A.pdf文件的第17页中有介绍:
Equation1:Norris-LandzbergModificationoftheCoffin-MansonEquation
另外LifeCycleReliabilityEngineering,Wiley(2006),0471715298.pdf有相关介绍,等会再传上来。
P269
Norris–LandzbergRelationshipTheCoffin–Mansonrelationshipassumesimplicitlythatfatiguelifedependsonlyonthetemperaturerangeofathermalcycle.
Insomeapplications,fatiguelifeisalsoafunctionofthecyclingfrequencyandhightemperature,asshownin,forexample,Ghaffarian(2000),TengandBrillhart(2002),andShohjietal.(2004).Takingintoaccounttheeffectsofthesethermalcyclingvariables,NorrisandLandzberg(1969)modifytheconventionalCoffin–Mansonrelationshipandpropose
P270
ByusingtheNorris–Landzbergrelationship,estimatetheactivationenergyandthemeanlifeundertheuseprofile,whereweassumethatTmin=−10◦C,Tmax=25◦C,andf=1cycleperhour.Alsocalculatetheaccelerationfactorbetweenthe
useprofileandtheacceleratingprofile,whereTmin=−30◦C,Tmax=105◦C,andf=2cyclesperhour |