Cyclic material properties distribution in laser-welded joints

Boroński, Dariusz

doi:10.1016/j.ijfatigue.2005.07.029

Cited by 35 publications

(22 citation statements)

References 3 publications

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“…Jutila's local surface displacement measurements lead to logarithmic weld failure strain of 0.1. His measurements are in accordance with literature findings, see for example Ç am et al (1999) and Boroński (2006). Furthermore, this local weld failure strain is obtained on the basis of the discrete pixel dimensions from the optical measuring system whereby the strain reference length is clearly defined.…”

Section: Weld Modellingsupporting

confidence: 89%

Numerical and experimental investigation on the collision resistance of the X-core structure

Ehlers

Tabri

Romanoff

et al. 2012

Ships and Offshore Structures

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This paper analyses the collision resistance of the X-core structure. The analysis includes a detailed investigation of the non-linear plate and laser weld material behaviour using optical, full-field strain measurements. The resulting material relationships are implemented into the finite element model. Furthermore, the finite element model includes the influence of the ship motions to accurately predict the collision resistance. The verification of the numerical results is done by a comparison of the experimental and numerical force versus penetration curves and by a comparison of the deformed geometries. The latter is achieved through a digitised three-dimensional model of the post-experimental X-core structure. As a result, the accuracy of the collision simulations is presented and discussed.

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Section: Weld Modellingsupporting

confidence: 89%

Numerical and experimental investigation on the collision resistance of the X-core structure

Ehlers

Tabri

Romanoff

et al. 2012

Ships and Offshore Structures

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“…The same Young's modulus was used as in the linear‐elastic assessment. The yield strength of base materials is given in Table , whereas the yield strength of the weld was assumed to be 770 MPa according to Boroński . Analysis suggests that the ratio of the yield zone increase, with respect to the load increase, has the higher rate in the case of bending than tension.…”

Section: Discussionmentioning

confidence: 99%

On the slope of the fatigue resistance curve for laser stake‐welded T‐joints

Frank

Remes

Romanoff

2013

Fatigue Fract Eng Mat Struct

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A B S T R A C T The paper investigates the influence of highly localised stress distribution around the notch tips of the laser stake-welded T-joints to the slope of the fatigue resistance curve. The study considers experimental data of eight series involving joints under tension or bending loads. Various boundary conditions and plate thicknesses are considered. The stress distribution in the singularity-dominated zone ahead of the notch tips is investigated by means of the finite element analysis. The aim is to relatively distinguish the stress distribution from one case to another. The growth rate of the elastic singular stress with respect to the distance from the tip is described by the dimensionless gradient. This gradient is equal to the slope of the linear stress-distance function when presented in double-logarithmic scale. The slope of the fatigue resistance curve varies approximately from 4 to 8. It is observed that the change of the slope can be closely associated with the gradient of the maximum principal stress evaluated in the plane that is orthogonal to the crack path. The orthogonal plane corresponds to the maximum principal stress direction. In contrast, there is a large scatter in the relation between the slope and the gradient evaluated in the commonly assumed crack plane. The study shows that the dimensionless gradient exhibits sensitivity towards plate thicknesses, local weld geometry and the loading condition.Keywords laser stake-welds; fatigue testing; J-integral; stress gradient; stress state. N O M E N C L A T U R Ea 1 , a 2 = notch depths [mm] C = material constant [À] e weld = offset of weld [mm] E = Young's modulus [MPa] h g = distance between joint plates [mm] J =J-integral [MPa mm] k ϕ = rotational stiffness [kN] l p = length of panel [mm] m = slope of the fatigue resistance curve [À] n = exponent of a stress function [À] N f = number of cycles to failure [À] s = spacing of web plates [mm] t f = face plate thickness [mm] t w = web plate thickness [mm] t weld = thickness of weld [mm] u i = node translation [mm]; i = x, y, z ΔF = force range [kN] ΔJ =J-integral range [MPa mm] ΔK I = range of stress intensity factor for fracture mode I [MPa mm 0.5 ] ΔK II = range of stress intensity factor for fracture mode II [MPa mm 0.5 ] θ MAX = direction of the maximum principal stress [°] θ MTS = initial crack propagation angle [°]

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“…In this development work, one of the fundamental issues is to understand the relation between microstructural quantities and material properties. This is especially challenging for advanced joining methods such as laser welding, where the properties of the narrow joint differ significantly from those of the base material [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

Lehto

Remes

Saukkonen

et al. 2014

Materials Science and Engineering: A

190

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The strength of polycrystalline metals increases with a decrease in grain size according to the HallPetch relationship. However, heterogeneous microstructures deviate from this relationship depending on the distribution of grain sizes. This paper introduces a rule of mixtures based approach for determining the characteristic length of the microstructure for heterogeneous weld metal. The proposed grain size parameter, the volume-weighted average grain size, is measured experimentally for nine structural steel weld metals and two base materials. The weld metals are found to have a large variety of grain size distributions that are noticeably broader than those of the base material due to differences in phase contents. The results show that the volume-weighted average grain size is able to capture the influence of grain size distribution on the strength of welded structural steel. Based on the experimental results, a modified Hall-Petch relationship is formulated for the strength prediction of heterogeneous microstructures. The modified relationship is also found to be applicable to data from the literature.

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Cyclic material properties distribution in laser-welded joints

Cited by 35 publications

References 3 publications

Numerical and experimental investigation on the collision resistance of the X-core structure

Numerical and experimental investigation on the collision resistance of the X-core structure

On the slope of the fatigue resistance curve for laser stake‐welded T‐joints

Influence of grain size distribution on the Hall–Petch relationship of welded structural steel

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