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Abstract

The drive to downgauge steel components by substituting mild steel with thinner high strength steel means that design engineers are now working closer to the design limits with respect to fatigue performance of spot welded structures. This study was carried out on an interstitial free mild steel and two high strength interstitial free steels, in sheet thicknesses 0.8 and 1.2 mm, representative of sheet thicknesses and grades in typical body-in-white automotive structures. The results obtained indicate that steel strength had little effect on fatigue performance for the range of steels studied. In contrast, both the loading mode and the sheet thickness had a significant influence. The results for shear loading were up to ten times greater when compared to peel loading conditions. Under shear loading conditions full plug failures were widely observed, whereas with peel loaded variants partial plug failures predominated. With respect to enhancing the fatigue properties the use of larger weld sizes was shown to be beneficial.

Keywords

STEELS BEAMS RESISTANCE SPOT WELDS FATIGUE PROPERTIES

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References

Fatigue

MSC.

: ‘MSC fatigue users guide’, Version 9, Vol. 2, 13, 1131— 1222; 1999, Santa, Ana, CA, MSC Software Corp.

ELLWOOD

and LEWIS

: ‘Maximising the fatigue durability of down-gauged high strength steel structures,’ Compass 99, University of Wales Swansea, March—April 1999, EMAS Publishing, 359–370.

SPERLE

J. O.

: Met. Constr., 1984, 16, 678–679.

RUPP

, STORZEL

and GRUBISIC

O. P.

: VOILLPILIET aided dimensioning of spot-welded automotive structures,’ SAE paper 950711, 1995.

British Standards Institution: ‘Code of Practice for Fatigue Design and Assessment of Steel Structures,’ BS 7608, 1993.

BHAT

S. P.

: Int. Conf. Detroit, February —March, 1984, SAE paper 840010.

COOU

C. H.

and SUN

: 11th Annual North American Welding Research Conf., Int. Conf. Proc, November 1995, 13–34.

SCHUTZ

and HEULER

: ‘The Significance of Variable Amplitude Fatigue Testing,’ ASTM STP 1231, 1994, pp. 201–220.

BARSOM

J. M

, KLIPPSTEIN

K. H.

and SHOEMAKER

A. K.

: ‘Fatigue behaviour of sheet steels for automotive applications,’ Committee of Sheet Steel Produces, AISI, Report 5G80-2, February 1980.

10.

ELLWOOD

, JONES

T. B.

and FOURLARIS

: Mater. Sei. Technol, 2003, 19, 1017–1024.

11.

KRAUSE

A. R.

, DAVIS

R. G.

and CHERNENKOFF

R. A.

: Int. Proc. Conf. Int. Symp. on ‘Interstitial free steel sheet’, Ottawa, ON, Canada, August 1991, CIM, 195–204.

12.

POLLARD

: Int. Conf. Detroit, February 1982, SAE paper 820284.

13.

KITAGAWA

, SATOH

and FUJIMOTO

: Int. Conf. Detroit, 1985, SAE paper 850371.

14.

HOBBACHER

: ‘Fatigue design of welded joints and com-ponents’, 1st edn, 3-127; 1996, Cambridge, The International Institute of Welding, Abington Publishing.

15.

MADDOX

S. J.

: ‘Fatigue strength of welded structures’, 2nd edn; 1991, Cambridge, Abington Publishing.

16.

TOSHIO

etal.: ‘Fatigue strength of base metal and spot welded joints in HSLA steels for automotive applications’, Nissan Kokan Technical Report No. 32, 1982, 31–40.

17.

GAO

, CHUCAS

, LEWIS

and MCGREGOR

I. J.

: ‘Review of CAE fatigue analysis techniques for spot-welded high strength steel automotive structures’, SAE paper offer number 01M-65, January 2001.

18.

MORI

et al.: Int. Conf. Detroit, February 1986, SAE paper 860604.

19.

DOWLING

N. E.

: Int. Conf. Detroit, October 1987, SAE paper 871966.

20.

HEIKE

and ANDRE

J. P.

: ISS Met. Work Steel Process. Conf. Proc., 1998, 40, 61–76.

21.

FEI

and PING

: Int. Conf. Detroit, September 1986, SAE paper 861395.

22.

CUTLER

A. N.

: ‘Modern statistical ideas in fatigue testing,’ EIS 1998, 2, (1), 14–21.

23.

MURAKAWA

and ZHANG

: Trans. JWRI, 1998, 27, (1), 75 — 82.

24.

WILLIAMS

and Jos

T. B.

: ‘The mechanism of weld bonding and the properties of weld bonded joints,’ Commission of the European Communities Research, Agreement No. 7210—KA/ 813, Report No. EUR 13931, June 1990.

25.

WILLIAMS

: ‘Resistance spot welding of low-carbon and high strength low-alloy steels,’ Commission of the European Communities Research, Agreement No. 7210— KD/803, May 1979—May 1982.

26.

JONES

T. B.

and WILLIAMS

N. T.

: Int. Conf. Detroit, February 1986, SAE paper 860583.

27.

British Standards Institution ‘Specification for Resistance Spot Welding of Uncoated and Coated Low Carbon Steel’, BS 1140, 1993.

Influence of steel strength and loading mode on fatigue properties of resistance spot welded H beam components

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