wow 发表于 2008-8-25 09:42:30

温湿度加速模型讨论

偶然看到一篇文章，里面有关温湿度加速试验的计算，希望大家一起来讨论讨论。



TemperatureCycle/thermalShock(Source:AmkorTech)

ConditionChamberzonesRealisticReliabilityrequirementsSpecifiedReliabilityRequirementCelsius~Iyearlife(cycles)~5yearslife(cycles)cycles0to100Single
(Slowramp,
2-5C/min)1809001500-25to100125625700-40to100120600800-40to12590450500-40to85Dual(fastramp,2-3sectransfer)130650300-500-40to10090450800-40to12570350500-55to12560300300

TemperatureHumidityTesting(source:MicroelectronicsReliabilityvol42,No8,ISBN0026-2714)
PropertiesTestMethods40oC/95%RH
85oC/85%RHACCF(T)relatedto25oC@Ea=1eV(eqn1)6.5683ACCF(RH)relatedto50%RH@X=5(extremecase)24.814.2ACCF(RH)relatedto50%RH@X=2.5
53.8
40oC/95%RHtestingtime(hours)485001000ACCF(T,Ea=1eV)*ACCF(RH,x=5)equivalent
years0.909.3318.6640oC/95%RHtestingtime485001000ACCF(T,Ea=1eV)*ACCF(RH,x=2.5)equivalent
years0.181.883.7685oC/85%RHtestingtime(hours)485001000ACCF(T,Ea=1eV)*ACCF(RH,x=5)equivalent
years53.88561.261122.5285oC/85%RHtestingtime485001000ACCF(T,Ea=1eV)*ACCF(RH,x=2.5)equivalent
years14.42150.20300.39
ACCF(T)=Lu/La=exp[(Ea/R)(1/Tu-1/Ta)]equation1
ACCF(RH)=[(RHa)/(RHu)]xequation2
ACCF(T,RH)=ACCF(T)*ACCF(RH)equation3

where:
ACCF=accelerationfactor
Lu=Lifeatnormalusecondition
La=lifeatacceleratedcondition
Ea=activationenergy
R=universalgasconstant
Tu=Tempatnormalusecondition
Ta=Tempatacceleratedcondition
RHu-Relativehumidityatnormalusecondition
RHa-Relativehumidityatacceleratedcondition
x=anempirircalextensionbetween2and2.5(basedonPeck'sModel)

ComparisonofthepropertiesoftwoTemperatureHumidityTestmethods


Note:
1.ChoiceofEaaswellasAcceleratedandNormaluseconditionhaveaverylargeeffectontheACCF(T)
2.The85/85methodhashigherACCF(T)whileitsACCF(RH)islower.
3.FailuremechanismsinducedbyTemperatureandRHarefullyindependent

流浪七月 发表于 2010-6-15 00:19:40

湿度加速是个和有争议的话题，敢问楼主资料出自哪里啊

ibmmaomao 发表于 2011-3-10 19:51:43

Plsanswer2ndfloor'squestion

ibmmaomao 发表于 2011-3-23 16:32:13

敢问楼主资料出自哪里啊?分享吓....

李根江 发表于 2011-11-17 23:17:41

质疑中。。。

wow 发表于 2012-12-28 09:04:15

也不记得在哪看到了，偶然看到这资料，所以觉得湿度方面加速不熟悉。来问问。

ghchange 发表于 2013-7-29 17:05:15

温循加速因子用什么模型？逆幂律模型？

加速因子与温变率有什么关系？

zhuyisheng1972 发表于 2013-7-31 00:30:23

学习

zhuyisheng1972 发表于 2013-7-31 00:30:33

学习

zhuyisheng1972 发表于 2013-7-31 10:36:53

学习
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