温湿度加速模型讨论

wow

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)

Condition	Chamberzones	RealisticReliabilityrequirements		SpecifiedReliabilityRequirement
Celsius		~Iyearlife(cycles)	~5yearslife(cycles)	cycles
0to100	Single (Slowramp, 2-5C/min)	180	900	1500
-25to100		125	625	700
-40to100		120	600	800
-40to125		90	450	500
-40to85	Dual(fastramp,2-3sectransfer)	130	650	300-500
-40to100		90	450	800
-40to125		70	350	500
-55to125		60	300	300

TemperatureHumidityTesting(source:MicroelectronicsReliabilityvol42,No8,ISBN0026-2714)

Properties				TestMethods
				40oC/95%RH	85oC/85%RH
ACCF(T)relatedto25oC@Ea=1eV(eqn1)				6.5	683
ACCF(RH)relatedto50%RH@X=5(extremecase)				24.8	14.2
ACCF(RH)relatedto50%RH@X=2.5				5	3.8

40oC/95%RH			testingtime(hours)	48	500	1000
ACCF(T,Ea=1eV)*ACCF(RH,x=5)			equivalent years	0.90	9.33	18.66
40oC/95%RH			testingtime	48	500	1000
ACCF(T,Ea=1eV)*ACCF(RH,x=2.5)			equivalent years	0.18	1.88	3.76
85oC/85%RH			testingtime(hours)	48	500	1000
ACCF(T,Ea=1eV)*ACCF(RH,x=5)			equivalent years	53.88	561.26	1122.52
85oC/85%RH			testingtime	48	500	1000
ACCF(T,Ea=1eV)*ACCF(RH,x=2.5)			equivalent years	14.42	150.20	300.39

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

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

Plsanswer2ndfloor'squestion

ibmmaomao

敢问楼主资料出自哪里啊?分享吓....

李根江

质疑中。。。

wow

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

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

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zhuyisheng1972

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zhuyisheng1972

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