Experimental Investigation of Failure Modes for Sandwich Beams

2017 ◽  
Vol 754 ◽  
pp. 115-118 ◽  
Author(s):  
Liviu Marșavina ◽  
Dan Andrei Şerban ◽  
Camelia Pop ◽  
Radu Negru
Keyword(s):  
Experimental Investigation ◽  
Aluminum Alloy ◽  
Mechanical Behavior ◽  
Failure Modes ◽  
Polyurethane Foams ◽  
Shear Stresses ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Rigid Polyurethane Foams

In this paper, the mechanical behavior in three-point bending was investigated for four different sandwich beams composed of aluminum alloy 1050 H24 faces and Necuron rigid polyurethane foams. The tests were conducted according to the recommendations of ASTM C393-00. Three different failure modes were observed (yielding of faces, face and core indentation and shear of core), being in accordance with the modes deducted from the calculated values of bending and shear stresses.

Experimental investigation of the three-point bending properties of sandwich beams with polyurethane foam-filled lattice cores

Structures ◽  
2020 ◽  
Vol 28 ◽  
pp. 424-432 ◽  
Author(s):  
Hossein Taghipoor ◽  
Arameh Eyvazian ◽  
Farayi Musharavati ◽  
T.A. Sebaey ◽  
Ahmad Ghiaskar
Keyword(s):  
Experimental Investigation ◽  
Polyurethane Foam ◽  
Sandwich Beams ◽  
Bending Properties ◽  
Three Point Bending ◽  
Foam Filled

Dynamic Mechanical Behavior of Aluminum Alloy Mortise-and-Tenon T-Joints

2018 ◽  
Vol 777 ◽  
pp. 533-537
Author(s):  
Hui Yuan Xiong ◽  
Zhi Peng Luo
Keyword(s):  
Experimental Investigation ◽  
Aluminum Alloy ◽  
Failure Modes ◽  
Bending Moment ◽  
Restoring Force ◽  
T Joints ◽  
Failure Characteristics ◽  
Dynamic Mechanical Behavior ◽  
Rigid Connection ◽  
Mortise And Tenon

An experimental investigation was conducted on aluminum alloy mortise-and-tenon T-joints (MT-joints) under dynamic cyclic loading. The MT-joints strengths, stiffness, failure characteristics, hysteresis curves, skeleton curves, restoring force models and energy dissipation curves of the joints have been reported. It’s shown from the experiment that main failure modes of the MT-joints are plastic deformation of squeezing area and tenon divorced from joint. And MT-joints structure is a typical semi-rigid connection that can withstand both rotation and bending moment.

Three-point bending deflection and failure mechanism map of sandwich beams with second-order hierarchical corrugated truss core

2016 ◽  
Vol 19 (1) ◽  
pp. 83-107 ◽  
Author(s):  
Gang Li ◽  
Yaochu Fang ◽  
Peng Hao ◽  
Zhaokai Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Failure Mechanism ◽  
Failure Modes ◽  
Second Order ◽  
Sandwich Beams ◽  
Plastic Yielding ◽  
Element Analysis ◽  
Three Point Bending ◽  
Truss Core

For sandwich beams with second-order hierarchical corrugated truss core under three-point bending, a correction factor of shear deflection was firstly proposed to improve the prediction accuracy of the bending analysis, which was verified by finite element analysis and compared with the original formula. Then, the failure modes of the sandwich beam under bending were analyzed, including four competing modes of the large struts (i.e. plastic yielding, buckling, wrinkling of facesheet, shear buckling) and two competing modes of the small struts (i.e. plastic yielding, buckling). Subsequently, the analytical expressions of critical load for each failure mode were derived. On this basis, the failure mechanism maps were constructed. Finally, several typical points from the map were selected and verified by finite element analysis, and a good agreement of predicted failure modes was observed.

Failure Modes in Sandwich Beams With Composite Face-Sheets and PVC Foam Cores

2000 ◽  
Author(s):  
Craig A. Steeves ◽  
Norman A. Fleck
Keyword(s):  
Glass Fibre ◽  
Failure Modes ◽  
Sandwich Beams ◽  
New Model ◽  
Three Point Bending ◽  
Reinforced Plastic ◽  
Glass Fibre Reinforced Plastic ◽  
Glass Fibre Reinforced ◽  
Composite Face

Abstract Sandwich beams with glass-fibre reinforced plastic faces and PVC foam cores were manufactured and tested in three point bending. The experiments were compared with analytical predictions of beam behaviour for three failure modes: face microbuckling, core shear collapse, and local indentation. A new model for indentation failure was developed which gives accurate predictions for ultimate strengths of sandwich beams that fail due to indentation.

scholarly journals Load-carrying capacity of the GFRP and CFRP composite beams subjected to three-point bending test – numerical investigations

2019 ◽  
Vol 23 (1) ◽  
pp. 277-286
Author(s):  
Dominik Banat
Keyword(s):  
Carbon Fibre ◽  
Composite Beam ◽  
Failure Modes ◽  
Fem Simulation ◽  
Composite Beams ◽  
Bending Test ◽  
Shear Stresses ◽  
Three Point Bending ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer

Abstract The subject of this article is the finite element method (FEM) simulation of the multi-layered rectangular composite beam subjected to three-point bending test. The study is focused on the composite beams made of glass or carbon fibre-reinforced laminates (glass fibre-reinforced polymer [GFRP] and carbon fibre-reinforced polymer [CFRP]) for which different laminate stacking were addressed. Three beam geometries with various length-to-thickness ratios included short beam shear (SBS) test, provided the beam is short relative to its thickness, which maximised the induced shear stresses. Simulation included the application of Tsai–Hill, Hoffman, Tsai–Wu, Hashin and Puck failure criteria to perform the composite beam failure analysis wherein the matrix and fibre failure were considered separately. Numerical failure studies also aimed to verify the beam failure modes and the participation of stress tensor elements in material failure.

Bending Response of Composite Sandwich Beams with M-Type Folded Cores

2014 ◽  
Vol 1049-1050 ◽  
pp. 452-455
Author(s):  
Li Xin Cong ◽  
Yu Guo Sun
Keyword(s):  
Failure Modes ◽  
Fiber Composite ◽  
Sandwich Beam ◽  
Deformation Mode ◽  
Sandwich Beams ◽  
The Finite Element Method ◽  
Carbon Fiber Composite ◽  
Maximum Displacement ◽  
Three Point Bending ◽  
Composite Sandwich

Bending properties and failure modes of sandwich structure with carbon fiber composite M-type folded cores were investigated and presented in this paper. Three point bending responses of both sandwich beams were measured. The finite element method was utilized to determine deformation mode of sandwich beam with M-type folded cores. Cores buckling and debonding have been studied under three point bending and the maximum displacement was also studied using FE-analytical and experimental methods.

The Failure Behavior of Geometrically Asymmetric Metal Foam Core Sandwich Beams Under Three-Point Bending

2014 ◽  
Vol 81 (7) ◽  
Author(s):  
Jianxun Zhang ◽  
Qinghua Qin ◽  
Weilong Ai ◽  
Huimin Li ◽  
T. J. Wang
Keyword(s):  
Failure Mechanism ◽  
Failure Modes ◽  
Metal Foam ◽  
Minimum Weight ◽  
Failure Behavior ◽  
Foam Core ◽  
Sandwich Beams ◽  
Three Point Bending ◽  
Initial Failure ◽  
Core Height

The failure behavior of geometrically asymmetric sandwich beams with a metal foam core is analytically and experimentally investigated. New initial failure modes of the asymmetric sandwich beams are observed under three-point bending, i.e., face yield, face wrinkling, core shear A, core shear AB, core shear A-AB, and indentation. It is shown that the initial failure modes of sandwich beams depend on the span of the beam, the thicknesses of top and bottom face sheets, core height and material properties. We derived the analytical formulae for the initial failure loads and then constructed the initial failure mechanism maps for the geometrically asymmetric sandwich beams. It is shown that the analytically predicted initial failure mechanism maps are in good agreement with the experimental results, which are clearly different from the symmetric sandwich beams. As a preliminary application, the minimum weight designs are presented for asymmetric metal sandwich beams.

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