Fracture mechanics analysis and evaluation of the fatigue strength of spot welded joints.

Yuuki, Ryoji; Ohira, Toru; Nakatsukasa, Haruaki; Yi, Won

doi:10.1299/kikaia.51.1772

Cited by 40 publications

(23 citation statements)

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“…For spot welds, Yuuki et al 32 , Smith and Cooper 33 and Henrysson 18 have successfully used the equivalent stress intensity factor according to Erdogan and Sih, 34 K eq in Eq. For spot welds, Yuuki et al 32 , Smith and Cooper 33 and Henrysson 18 have successfully used the equivalent stress intensity factor according to Erdogan and Sih, 34 K eq in Eq.…”

Section: E S T I M a T I O N O F F A T I G U E L I F E F O R O V E R mentioning

confidence: 99%

Effects of mean stress and crack closure on fatigue life of spot welds

Henrysson

2002

Fatigue Fract Eng Mat Struct

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The effects of mean stress and crack closure on fatigue life of spot welds were investigated. A review showed that several of the previously proposed mean stress corrections give similar results. Fatigue tests on shear and peel loaded specimens were carried out, and the results agreed with the corrections reviewed. The present study shows that crack closure explains the mean stress effects observed. The crack opening force for spot welds was obtained, both experimentally from F–N curves with different load ratios and analytically from the available mean stress corrections. This was verified with detailed finite element simulations. Finally, the experiments and simulations indicate that the use of linear damage accumulation in fatigue life prediction of spot welds can be non‐conservative.

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Section: E S T I M a T I O N O F F A T I G U E L I F E F O R O V E R mentioning

confidence: 99%

Effects of mean stress and crack closure on fatigue life of spot welds

Henrysson

2002

Fatigue Fract Eng Mat Struct

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“…Especially the last bullet point is highly dependent on the local stress state and the load level of the tested specimens and structures and has been focus of a diversity of researchers since the 1970s [5][6][7].…”

Section: Fatigue Assessment Of Spot Welded Structuresmentioning

confidence: 99%

A novel approach to simulate the stiffness behaviour of spot welded vehicle structures under multi axial variable amplitude loading

Rösch¹,

Schmidt²,

Bruder³

2018

MATEC Web Conf.

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Abstract. Under cyclic loading in combination with high local stress levels a change in stiffness of connection points, e.g. spot welds, self-piercing rivets or flow drill screws can be observed. This paper introduces a numerical approach for the simulation of stiffness changes in vehicle structures under multiaxial cyclic loading as a result of the stiffness degradation of individual spot welds. The basic approach is based on a conventional damage accumulation combined with a power law representing the change in the spot weld's stiffness. Instead of an accumulated damage value D a residual stiffness is set as failure criterion. Extensions to the approach are presented for its application to multiaxial loading with variable amplitudes. A conventional multiaxial fatigue test of a complete vehicle, focusing on its rear end including global stiffness and local strain measurements at the beginning, median and at the end of the test are presented and compared to the simulated results. This computation approach allows a more reliable fatigue assessment in comparison to a fatigue analysis which does not consider stiffness changes. The damage propagation after the crack initiation at an individual spot weld is represented more accurately as subsequent changes in the load paths are considered.

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“…The work by Yuuki, Ohira, Nakatsukasa, and Yi (1986) first showed the feasibility of the stress intensity factor in correlating fatigue strength of spot welds for different specimens.…”

Section: Linear Elastic Fracture Mechanics Approachmentioning

confidence: 99%