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Eigenfrequency analyses of laser-welded web–core sandwich panels
Abstract A web–core steel sandwich panel is a lightweight structure where thin plates are welded together by laser-welding technique. The plates form a T-joint which has in the center a weld thinner than the plates themselves. Thus the rotational stiffness of the joint is not infinite. The paper investigates the influence of T-joint rotational stiffness on the lowest natural vibration frequency of the panel. The methods used in the study have different kinematic assumptions. Equivalent single-layer (ESL) theory is used to obtain the frequency of the global vibration. The local vibrations are predicted using an isolated part of the panel, the I-beam model. In addition, three-dimensional model of a sandwich panel is analyzed. Finite element method (FEM) and analytical solution are used to obtain the frequencies. First-order shear deformation theory (FSDT) is used. The joint is considered through its rotational stiffness whose quantitative values are presented in the literature. Four different cross-sections with industrial relevancy are considered. The rotational stiffness of the T-joint affects the transverse shear stiffness of the panels. The results show up to 22% reduction of the fundamental frequency when compared with the case of the rigid joint for the global vibration mode. The effect on local vibrations is up to 11% in the case of asymmetric rotation in the T-joint and is otherwise insignificant. The study furthermore outlined the limitations of the ESL approach for assessment of natural frequencies in web–core sandwich panels depending on the vibration mode shape. The results show that the rotational stiffness of the T-joint has to be considered in the conceptual design of these structures.
Highlights T-joint stiffness affects the fundamental frequency of web–core sandwich panels Influence is significant when 90° angle of the T-joint changes due to vibration mode This is typical in global bending of panels and local bending of faces The effect is explained in terms of the transverse shear stiffness D Qy of the panels Higher reduction of D Qy results in higher reduction of the fundamental frequency
Eigenfrequency analyses of laser-welded web–core sandwich panels
Abstract A web–core steel sandwich panel is a lightweight structure where thin plates are welded together by laser-welding technique. The plates form a T-joint which has in the center a weld thinner than the plates themselves. Thus the rotational stiffness of the joint is not infinite. The paper investigates the influence of T-joint rotational stiffness on the lowest natural vibration frequency of the panel. The methods used in the study have different kinematic assumptions. Equivalent single-layer (ESL) theory is used to obtain the frequency of the global vibration. The local vibrations are predicted using an isolated part of the panel, the I-beam model. In addition, three-dimensional model of a sandwich panel is analyzed. Finite element method (FEM) and analytical solution are used to obtain the frequencies. First-order shear deformation theory (FSDT) is used. The joint is considered through its rotational stiffness whose quantitative values are presented in the literature. Four different cross-sections with industrial relevancy are considered. The rotational stiffness of the T-joint affects the transverse shear stiffness of the panels. The results show up to 22% reduction of the fundamental frequency when compared with the case of the rigid joint for the global vibration mode. The effect on local vibrations is up to 11% in the case of asymmetric rotation in the T-joint and is otherwise insignificant. The study furthermore outlined the limitations of the ESL approach for assessment of natural frequencies in web–core sandwich panels depending on the vibration mode shape. The results show that the rotational stiffness of the T-joint has to be considered in the conceptual design of these structures.
Highlights T-joint stiffness affects the fundamental frequency of web–core sandwich panels Influence is significant when 90° angle of the T-joint changes due to vibration mode This is typical in global bending of panels and local bending of faces The effect is explained in terms of the transverse shear stiffness D Qy of the panels Higher reduction of D Qy results in higher reduction of the fundamental frequency
Eigenfrequency analyses of laser-welded web–core sandwich panels
Jelovica, J. (author) / Romanoff, J. (author) / Klein, R. (author)
Thin-Walled Structures ; 101 ; 120-128
2016-01-04
9 pages
Article (Journal)
Electronic Resource
English
Eigenfrequency , Laser-weld , T-joint , Sandwich , Web–core , Steel , Orthotropic
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