1、 p Yy k李 莉 谢里阳 何雪浤 赵晋芳东北大学,沈阳,110004K1:考虑应力集中、表面加工及尺寸三方面影响因素设计10种疲劳试样,进行拉压疲劳试验,得到了不同形式试样的疲劳寿命。应用三参数Weibull分布描述了疲劳寿命分布的特性。试验结果分析表明:同时存在应力集中和表面加工影响的零件,应力集中对疲劳寿命的影响起主导作用;对于缺口试件,纯粹意义上的尺寸效应是不起作用的,危险点周围材料的应力梯度是造成尺寸效应的关键。1oM: “;XFV ;jr; p ; Weibullsms |:TH114;O346.23 cI|:1004132X(2010)03035504Experimental
2、StudyonFactorsInfluencingFatigueLifeLi Li XieLiyang HeXuehong Zhao JinfangNortheastern University, Shenyang, 110004Abstract:10 kinds of fatiguespecimensweredesigned consideringinfluencefactors of stresscon-centration, machined surface and size effect.The fatigue life of different form specimens were
3、 ob-tained after repeated tension and compression tests, and its dispersion described by three-parameterWeibulldistribution.Fatigue test results indicate that, the stress concentration plays a leading rolewhen stressconcentration and machined surfaceaffect parts fatiguelifesimultaneously.For thenot-
4、ched specimen, itis stress gradient around materialdanger point causes thesizeeffect.Keywords:stress concentration;machined surface;size effect;fatigue life;three-parameterWeibulldistributionl :20090316 “:SE8 63/ ?Z9 “(2006AA04Z408)0 引言q min xi(5)v T(1) T(5), k“ p Weibulls 9nV4。V4, Q p s , 1 r %,M ,
5、 B p= r M,5 9M。 1Q p (, T T r1VB HW ?7, * rs|B. BK p 7 S,K p 。V4 p Weibulls 9k“I| (Q) (Q)GM10GC10QM10QC10DQM10DQC10QM18QC18DQM18DQC181.81.82.31.82.21.82.51.92.72.3621 140750 21759 02573 77371 88755 033193 558153 883180 18997 525480931363307424542191612933185755118976352937657183.1 “ p Ym6 S10mm; d k
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7、F p YV5 V,S10mm;dk“ ( p d k“ ( p 10.9972。 gd k“ ( p d k“ ( p 10.9235。 VnV F g k“ p Y ; k“ g k“ p Y 。 “ P gd k“ ( p ; d k“ (357 p Yy k 9! p 9.17%, gd k“ ( p ;d k“ ( p 8.49%。 H I nV FY, gd k“ ( p ; d k“ ( p 8.47%, g d k“ ( p ;d k“ ( p 9.20%, Vn “V F Yy Hi H, “ p Y T。V5 S10mm k“ ( p 1GM10(1 033125Q)GC1
8、0(1030 250Q)QM10(94 750Q)QC10(87 500Q)GM10(1 033 125Q) 1.0000 0.9972 0.0917 0.0847GC10(1 030 250Q) 1.0028 1.0000 0.0920 0.0849QM10(94 750Q) 10.9037 10.8734 1.0000 0.9235QC10(87 500Q) 11.8071 11.7743 1.0829 1.00003.4 j p Y g kqi “C,yN s 、 s、 s s ei 05,* j g k“ p sY9 i。m9、m10 V Aj g dk“ g d k“ p Y M。
9、“ M g k“,S18mmvj g k“ ( p #s v。m9 j g d k“ p sm10 j g d k“ p s4 结束语k “、V F#j Zy p sY。 kTV VF; k“Y g k“Y , * Y; k“V F“mV,i “ ,q !9 。 Hi “V FY ,q, “ p Y1V F p Yv, kr10 , N H “ p Y T。S18mm g k“ kvj k“ ( p 1lj k“ ( p , Beil jr g kq T,B 0 /jr1o。 ID:1 . V L !9M .: S,2006.2 Peterson R E.Stress Concentratio
10、n Factor M.New York:JohnWiley andSons, 1974.3 Makkonen M.Notch Size Effects in the FatigueLimit of SteelJ .International Journal of Fatigue,2003,25(1):17-26.4 Bush A.Fatigue Strength Calculation M .Stafa-ZarichSwitzerland:Trans Tech Publication, 1988.5 ,. q M . +:v,1994.6 . M .:v,1985.7 1 7 ,-.1 g“ J. ,1994,16(4):19-26.8 u . F !9M .:,1994.9 8SS . kZESI( )M.:SS,2002.10 ,Z, -,. ? k !9 ) M .:t bt?v,1999.11 , . L V L !9 ZEM .: S,2003.(I )?)Te:李 莉, o,1980 M 3。v1p V 3。1Z_ V Ly 、 V Ls。?V 4 。谢里阳, 3,1962 M 3。v1 q、p V 3 =。何雪浤, o,1965 M 3。v1 q。赵晋芳, o,1981 M3。v1p V 3。358S21 3 2010 M2
