A new nonlinear model for studying a sandwich panel with thin composite faces and elastic–plastic core

Rezaeifard, M.; Salami, S. Jedari; Dehkordi, M. Botshekanan; Sadighi, Mojtaba

doi:10.1016/j.tws.2016.06.012

Cited by 21 publications

(14 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The constitutive relationship of the component materials in the test joint is shown in Figure 5. To improve the accuracy and convergence speed of the finite-element analysis results, when the finite-element model is constructed, a fine meshing is used for the parts with holes and the parts where stress concentration can easily occur [25][26][27][28][29] (Figure 6). Additionally, to fully consider the contact between the upper and lower covers and the aluminum-alloy beams and the contact between the stainless-steel bolts and the bolt holes, face-to-face contact unit connections are used.…”

Section: Analysis Methodsmentioning

confidence: 99%

Mechanical properties of a novel joint of a single-layer aluminum-alloy combined lattice-shell structure

Zhao¹,

Ma²,

Du³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

To overcome the shortcomings of traditional aluminum-alloy gusset joints, i.e., the low bearing capacity caused by the lack of a shear connector that makes these joints unsuitable for an aluminum-alloy combined lattice-shell structure of a larger span, this paper proposes a novel joint with a high bearing capacity that has a cylindrical socket-and-spigot type shear connector at the center of the joint. Experimental research was carried out on the novel joint. The results show that the overall stiffness and shear resistance of the novel joint are greatly improved compared with those of a traditional gusset joint and that the out-of-plane bending capacity is more than 50 % higher. The failure mode of the novel joint is mainly manifested by tension and shear block failure of the lower cover plate when the thickness of the gusset plate is small and torsional buckling failure of the connected aluminum-alloy beam. An elastoplastic finite-element parametric analysis based on multiple contacts shows that the bearing capacity of the proposed joint is related to the thickness of the connecting plates and the diameter and number of bolts. Based on the working mechanism of the novel joints, this paper offers a simplified calculation formula for the ultimate bearing capacity of the joint. The results of this paper can provide a theoretical basis for making and revising the design codes for this novel joint.

show abstract

Section: Analysis Methodsmentioning

confidence: 99%

Mechanical properties of a novel joint of a single-layer aluminum-alloy combined lattice-shell structure

Zhao¹,

Ma²,

Du³

et al. 2019

Mater. Tehnol.

View full text Add to dashboard Cite

show abstract

“…Recently, numerical solutions have been explored by adopting the Ritz method based on EHSAPT or HSAPT. The accuracy of the Ritz method strongly depends on the choice of trial functions, including power series [13] or polynomial series [12]. These theoretical models seem relatively slow in convergence.…”

Section: Numerical Formulationmentioning

confidence: 99%

“…Rezaeifard et al. [12] presented a new nonlinear model for sandwich beams with transversely flexible cores based on HSAPT and derived the governing equations by Galerkin weighted residual method. As a progressive step, Salami et al.…”

Section: Introductionmentioning

confidence: 99%

Static mechanical response of sandwich panels with bilinear core

Wei

Feng

2018

Jnl of Sandwich Structures & Materials

View full text Add to dashboard Cite

A new theoretical model based on the extended high order sandwich panel theory is established to predict the mechanical response of sandwich panels under static loads with the bilinear constitutive stress–strain relation in the core. The constitutive relations of normal stresses related to the longitudinal and vertical normal strains in the bilinear isotropic hardening core are first formulated. The influence of the in-plane rigidity on the elastoplastic response of sandwich structures is analyzed. An in-plane loaded sandwich structure with the bilinear core is first studied based on extended high order sandwich panel theory, and the effect of the bilinear ratio on the mechanical response is evaluated. The governing equations are derived from the principle of minimum potential energy, and a Ritz-based half-analytical method is applied to get the solutions. The plastic response is acquired by an iterative procedure along with the convergence criteria. The results reveal that the local effect can be captured when the axial rigidity of the core is considered. The bilinear characteristic of the core decreases the maximum normal stress with an increase of the average value. The equivalent plastic region extends with the increase of the bilinear ratio when the sandwich structure is loaded in plane. By comparison with open literatures and finite element results, the present theoretical model is proved to be effective and efficient.

show abstract

“…Figure 4 shows the simplified constitutive relationships assumed for each part of the modeled specimen. The honeycomb core is modeled with shell elements while facesheets are modeled with solid elements [31][32][33]; core and facesheets are connected by contact elements [34,35]. As the model has symmetric geometrical dimensions, boundary constraint, and load, the analysis is based on a semi-structure, unidirectional, and uniform displacement load is applied to the end surface of the honeycomb sandwich structure at the slip end.…”

Section: Finite Element Modeling and Analysismentioning

confidence: 99%

Shear Strengths of Different Bolt Connectors on the Large Span of Aluminium Alloy Honeycomb Sandwich Structure

Zhao

Zheng

et al. 2017

Applied Sciences

View full text Add to dashboard Cite

This study investigates the shear capacity of aluminum alloy honeycomb sandwich plates connected by high-strength, ordinary, or self-tapping bolts. For that purpose, experimental tests and finite elements are carried out. The failure of a high-strength bolt connector is driven by bending deformations developed in the bolt that deform connection plate and pad openings. In the case of ordinary bolt connectors, stress concentration on the bolt shear surface causes a large shear deformation that finally leads to failure. In the case of self-tapping bolt connectors, the insufficient mechanical bite force of the screw thread yields the bolt misalignment and concentrates shear deformation. As a result, the high-strength bolt connector is the most efficient design solution. If the bolt hole edge distance is more than 1.5 times as much as the bolt diameter, the connection performance becomes insensitive to this parameter. The practical formula for evaluating the connector shear capacity is derived from experimental data.

show abstract

A new nonlinear model for studying a sandwich panel with thin composite faces and elastic–plastic core

Cited by 21 publications

References 19 publications

Mechanical properties of a novel joint of a single-layer aluminum-alloy combined lattice-shell structure

Mechanical properties of a novel joint of a single-layer aluminum-alloy combined lattice-shell structure

Static mechanical response of sandwich panels with bilinear core

Shear Strengths of Different Bolt Connectors on the Large Span of Aluminium Alloy Honeycomb Sandwich Structure

Contact Info

Product

Resources

About