Transverse shear stiffness of corrugated core steel sandwich panels with dual weld lines

Nilsson, Peter; Al‐Emrani, Mohammad; Atashipour, Seyed Rasoul

doi:10.1016/j.tws.2017.04.008

Cited by 34 publications

(22 citation statements)

References 6 publications

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“…In previous works, laser welding was utilized in the production of I-core (e.g., Klostermann [10] and Romanoff [11]) and corrugated core (e.g., Peters et al [2] and Caccese and Yorulmaz [8]) sandwich panels. For CCSSPs, Nilsson et al [7,12] showed that dual weld lines are needed to ensure a sufficient service life with respect to fatigue. Several aspects of production of laser-welded all-steel sandwich panels affect the final geometric properties of the panel: both the local geometry of the welded joint and the global geometry, i.e., welding distortions.…”

Section: Introductionmentioning

confidence: 99%

The impact of production-dependent geometric properties on fatigue-relevant stresses in laser-welded corrugated core steel sandwich panels

et al. 2019

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For bridge deck applications, laser-welded corrugated core steel sandwich panels with dual weld lines per crest and trough have been shown to be highly material-and economically efficient. The nature of welding induces a variation in the geometric properties of the joint that connects the core to the faces. The geometric properties of the joint are the weld width, weld misalignment, and plate gap between the core and the faces. This paper aims to investigate the impact of the variation of the production-dependent geometric properties of the joint on the fatigue-relevant stresses. A secondary aim of this paper is to investigate the impact of contact between the core and the faces on the weld region stresses. Within this paper, the production of four sandwich panels is documented and the manufacturing-dependent geometric properties of their joints are quantified. In order to investigate the impact of the natural variation of the parameters, a parametric study based on finite element analyses is executed. The result of the parametric study shows, among several other findings, that misalignment of the weld line in relation to the core direction can lead to considerable increases in stresses, determinant for the fatigue life of the panel.

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Section: Introductionmentioning

confidence: 99%

The impact of production-dependent geometric properties on fatigue-relevant stresses in laser-welded corrugated core steel sandwich panels

et al. 2019

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“…The web-core microstructure displayed in Fig. 4 can be modeled by using four nodally-exact Euler-Bernoulli or Timoshenko beam finite elements as both choices result in a system that is consistent with the generalized displacement vector (13). As for their material composition, the elements can be heterogeneous and anisotropic.…”

Section: Unit Cell Strain Energy and Beam Constitutive Matrixmentioning

confidence: 99%

“…By one estimate [2], a ship deck constructed of steel sandwich panels offers 30-50% weight savings compared to traditional stiffened steel plate solutions. While this study is motivated by ship structures, steel sandwich panels show good potential for applications in bridges and buildings as well [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Two-scale constitutive modeling of a lattice core sandwich beam

Karttunen

Reddy

Romanoff

2019

Composites Part B: Engineering

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Constitutive equations are derived for a 1-D micropolar Timoshenko beam made of a web-core lattice material. First, a web-core unit cell is modeled by discrete classical constituents, i.e., the Euler-Bernoulli beam finite elements (FE). A discrete-to-continuum transformation is applied to the microscale unit cell and its strain energy density is expressed in terms of the macroscale 1-D beam kinematics. Then the constitutive equations for the micropolar web-core beam are derived assuming strain energy equivalence between the microscale unit cell and the macroscale beam. A micropolar beam FE model for static and dynamic problems is developed using a general solution of the beam equilibrium equations. A localization method for the calculation of periodic classical beam responses from micropolar results is given. The 1-D beam model is used in linear bending and vibration problems of 2-D web-core sandwich panels that have flexible joints. Localized 1-D results are shown to be in good agreement with experimental and 2-D FE beam frame results.

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“…[8] that the rotational stiffness of the weld region for a corrugated core steel sandwich panel with dual weld lines has a modest impact on the transverse shear stiffness perpendicular to the core. Nevertheless, a considerable impact of the weld rotational stiffness on the stress magnitudes in the constituent plates was also concluded [8]. Considering web-core sandwich panels (panels with a straight web, see Fig.…”

Section: Introductionmentioning

confidence: 95%

02.07: A numerical approach to the rotational stiffness of stake welds

2017

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Stake welds of two parallel plates enable the production of several different types of all-steel sandwich panels. One example is laser-welded corrugated core all-steel sandwich panels. The normal stresses close to the welds and in the welds of corrugated core steel sandwich panels with dual weld lines through subjected to shear has been shown to be affected by the rotational stiffness of the weld region. This paper presents an approximate closed-form solution for the weld region rotational stiffness as a function of the geometric properties. The solution is based on linear and non-linear regression analysis using the results of 4000 finite element analyses (FEA). All FEA are executed with linear constitutive relations. The presented solution is shown to have a high accuracy within the investigated range. The study ranges over plate thicknesses between 4 and 16mm, gap between the plates between 0.1 and 1.0mm and weld widths from 1 to 4mm. It was shown that the maximum possible error of 7% between the closed-form solution and FEA within the investigated range has a negligible effect on the transverse shear stiffness of corrugated core steel sandwich panels.

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Transverse shear stiffness of corrugated core steel sandwich panels with dual weld lines

Cited by 34 publications

References 6 publications

The impact of production-dependent geometric properties on fatigue-relevant stresses in laser-welded corrugated core steel sandwich panels

The impact of production-dependent geometric properties on fatigue-relevant stresses in laser-welded corrugated core steel sandwich panels

Two-scale constitutive modeling of a lattice core sandwich beam

02.07: A numerical approach to the rotational stiffness of stake welds

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