Mechanical performance of GFRP-profiled steel sheeting composite sandwich beams in four-point bending

2018 ◽  
Vol 206 ◽  
pp. 921-932 ◽  
Author(s):  
Fubin Zhang ◽  
Weiqing Liu ◽  
Zhibin Ling ◽  
Hai Fang ◽  
Dandan Jin
Keyword(s):  
Mechanical Performance ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Four Point Bending

The experimental static mechanical performance of ironed repaired GFRP–honeycomb sandwich beams

2012 ◽  
Vol 14 (6) ◽  
pp. 694-714 ◽  
Author(s):  
Benjamin William Mounir Kirollos ◽  
Richard Trede ◽  
Peter Lampen
Keyword(s):  
Glass Fibre ◽  
Mechanical Performance ◽  
Repair Process ◽  
Flexural Stiffness ◽  
Sandwich Beams ◽  
Four Point Bending ◽  
Reinforced Plastic ◽  
Glass Fibre Reinforced Plastic ◽  
Static Mechanical ◽  
Glass Fibre Reinforced

Damaged glass fibre reinforced plastic–honeycomb core sandwich beams are repaired using uncured glass fibre reinforced plastic fabrics and a handheld iron. The effect of iron temperature, application time and pressure on the effectiveness of repair is investigated by measuring the failure load and flexural stiffness of the repaired beams using third span four-point bending tests. Repairs are tested in compression and tension. A repair process is suggested which consistently recovers 95% of the compressive strength and 77% of the tensile strength of the damaged beam. The repair is shown to have little effect on beam flexural stiffness.

scholarly journals Failure of Composite Sandwich Beams

2002 ◽  
Vol 11 (3) ◽  
pp. 096369350201100 ◽  
Author(s):  
I. M. Daniel ◽  
E. E. Gdoutos ◽  
K.-A. Wang
Keyword(s):  
Failure Modes ◽  
Foam Core ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Four Point Bending ◽  
Constituent Material ◽  
Closed Cell ◽  
Failure Envelopes ◽  
Geometrical Dimensions ◽  
Cell Foam

A thorough investigation of failure behaviour of composite sandwich beams under three- and four-point bending was undertaken. The beams were made of unidirectional carbon/epoxy facings and a PVC closed-cell foam core. The constituent materials were fully characterised and in the case of the foam core, failure envelopes were developed for general two-dimensional states of stress. Various failure modes including facing wrinkling, indentation failure and core failure were observed and compared with analytical predictions. The initiation, propagation and interaction of failure modes depend on the type of loading, constituent material properties and geometrical dimensions.

Improving four-point bending performance of marine composite sandwich beams by core modification

2020 ◽  
Vol 54 (8) ◽  
pp. 1049-1066
Author(s):  
F Balıkoğlu ◽  
N Arslan ◽  
TK Demircioğlu ◽  
O İnal ◽  
M İren ◽  
...  
Keyword(s):  
Bending Strength ◽  
Mechanical Performance ◽  
Composite Beams ◽  
Bending Stiffness ◽  
Bending Test ◽  
Sandwich Composite ◽  
Foam Core ◽  
Sandwich Beams ◽  
Bending Performance ◽  
Four Point Bending

The aim of this study was to improve four-point bending performance of foam core sandwich composite beams by applying various core machining configurations. Sandwich composites have been manufactured using perforated and grooved foam cores by vacuum-assisted resin transfer moulding method with vinyl-ester resin system. The influence of grooves and perforations on the mechanical performance of marine sandwich composite beams was investigated under four-point bending test considering the weight gain. Bending strength and effective bending stiffness increased up to 34% and 61%, respectively, in comparison to a control beam without core modification. Analytical equations were utilised for calculating the mid-span deflection, equivalent bending stiffness and ultimate bending strength of the sandwich beams. Finite element analysis was also performed to analyse the flexural response of the specimens taking into account the combined effect of orthotropic linear elasticity of the face sheet and the non-linear behaviour of the foam core.

Finite Element Analysis of Centrally-Debonded Composite Sandwich Beam under Four Point Bending

2011 ◽  
Vol 335-336 ◽  
pp. 351-354 ◽  
Author(s):  
Meng Kao Yeh ◽  
Yu Wen Chiu
Keyword(s):  
Finite Element ◽  
Composite Structures ◽  
Sandwich Structure ◽  
Sandwich Beam ◽  
Core Material ◽  
Sandwich Beams ◽  
Element Analysis ◽  
Specific Strength ◽  
Composite Sandwich ◽  
Four Point Bending

Sandwich structure, with high specific strength, high specific stiffness facesheet and light-weighted core material bonded together, is one of commonly used composite structures. During the manufacturing process, it is possible to have debonding between facesheet and core. This facesheet/core debonding affects the mechanical property and strength of sandwich structure. In this study, sandwich beams are made of graphite/epoxy laminate as facesheet and MWNTs/epoxy nanocomposites as core material. The composite sandwich beam, with a central facesheet/core debond and under four point bending, was analyzed by the finite element method. The length of the debonding layer, the fiber orientation of the facesheet laminate and MWNTs content in core were varied to assess their effects on the bending behavior and the strengths of the centrally-debonded sandwich beams.

scholarly journals Failure modes of composite sandwich beams

2008 ◽  
Vol 35 (1-3) ◽  
pp. 105-118 ◽  
Author(s):  
E. Gdoutos ◽  
I.M. Daniel
Keyword(s):  
Failure Modes ◽  
Failure Behavior ◽  
Foam Core ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Four Point Bending ◽  
Constituent Material ◽  
Closed Cell ◽  
Failure Envelopes ◽  
Geometrical Dimensions

A thorough investigation of failure behavior of composite sandwich beams under three-and four-point bending was undertaken. The beams were made of unidirectional carbon/epoxy facings and a PVC closed-cell foam core. The constituent materials were fully characterized and in the case of the foam core, failure envelopes were developed for general two-dimensional states of stress. Various failure modes including facing wrinkling, indentation failure and core failure were observed and compared with analytical predictions. The initiation, propagation and interaction of failure modes depend on the type of loading, constituent material properties and geometrical dimensions.

Fatigue performance of undamaged and repaired composite sandwich beams

2003 ◽  
Vol 217 (3) ◽  
pp. 229-248
Author(s):  
S Mahdi ◽  
A J Kinloch ◽  
F L Matthews ◽  
M A Crisfield
Keyword(s):  
Low Temperature ◽  
Carbon Fibre ◽  
Fatigue Performance ◽  
Sandwich Beams ◽  
Composite Sandwich ◽  
Four Point Bending ◽  
Reinforced Plastic ◽  
Tension And Compression ◽  
Carbon Fibre Reinforced Plastic ◽  
Low Temperature Cure

The behaviour of undamaged (i.e. as-manufactured) and repaired carbon fibre reinforced plastic (CFRP) sandwich beams loaded in cyclic four-point bending is described. Three repair configurations (one overlap and two scarf) were tested in tension and compression, and two repair systems (high- and low-temperature cure) were employed. The repaired beams always showed an inferior performance compared with the as-manufactured beams. The lifetime was dependent on the repair configuration, with the overlap repairs performing surprisingly well when loaded in compression. The degradation of stiffness with cycling was also investigated and was related to the microscopic evolution of damage.

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