High Strength Steel and Welding Technologies in Body Assemblies

Nakanishi, Eizaburo

doi:10.2207/jjws.75.525

Cited by 9 publications

(1 citation statement)

References 1 publication

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“…Recently, it has been demanded to develop the lightened body which has the high stiffness and strength for the fuel economy and the vehicle safety performance in the automobile industry. For these demands, it has been considered to apply the ultra high strength steel to the body (1), (2) . However, a few reports indicate the fatigue strength of the spot welded joints using the high strength steel was not improved compared with the conventional mild steel nevertheless the improved fatigue strength of their base metal.…”

Section: Introductionmentioning

confidence: 99%

3-Dimensional Observation of Fatigue Crack Propagation on Spot Welded Joints using High Strength Steel

Tanegashima

Akebono

Kato

et al. 2011

IJAE

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In this study, in order to investigate the fatigue characteristics of the spot welded joints using the high strength steel, fatigue tests were conducted and internal fatigue crack behavior around the spot area was observed in detail. Test results showed that spot welded joints had the low fatigue strength compared with the tensile strength of base metal and spot welded joints. Moreover, it was clarified spot welded joints used in this study require many cyclic loading to initiate the fatigue crack. Furthermore their fatigue crack propagation indicates the similar behavior in major part of life independently of the stress level.

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Section: Introductionmentioning

confidence: 99%

3-Dimensional Observation of Fatigue Crack Propagation on Spot Welded Joints using High Strength Steel

Tanegashima

Akebono

Kato

et al. 2011

IJAE

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3-Dimensional Observation of Fatigue Crack Propagation on Spot Welded Joints Using High Strength Steel

et al. 2010

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Establishment of the Fatigue Cumulative Damage Evaluation Based on the Applied Load for the Spot Welded Joints Using 590 MPa-Class Automobile Steel

Tanegashima

2012

Trans.JSME, Ser.A

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In this paper, fatigue tests were carried out under the repeated two-step and random loading condition using the spot welded joints which had the base metal categorized into 590MPa class in order to consider the effect of their loading condition on fatigue characteristics of the joints. As the results of fatigue tests under the repeated two-step loading condition, it was found that the fatigue limit of the spot welded joints was vanished. Therefore, we found that it was necessary to consider the effect of the damage caused by the loading below the fatigue limit on the fatigue damage of the spot welded joints. When the random loading fatigue tests were carried out, it was confirmed that evaluation of the cumulative damage value considered with the mean loading effect had validity though the result of them considered without it indicated the un-conservative estimation. Thus, it was necessary to estimate the mean loading effect on the cumulative damage value of the spot welded joints under the random loading condition. Moreover, for considering the local mean stress involved with the deformation of the spot welded joints, it will be achieved to make the precise cumulative damage value evaluation.

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High Strength Steel and Welding Technologies in Body Assemblies

Cited by 9 publications

References 1 publication

3-Dimensional Observation of Fatigue Crack Propagation on Spot Welded Joints using High Strength Steel

3-Dimensional Observation of Fatigue Crack Propagation on Spot Welded Joints using High Strength Steel

3-Dimensional Observation of Fatigue Crack Propagation on Spot Welded Joints Using High Strength Steel

Establishment of the Fatigue Cumulative Damage Evaluation Based on the Applied Load for the Spot Welded Joints Using 590 MPa-Class Automobile Steel

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