Quasi-static indentation tests on aluminium foam sandwich panels

In accordance to ASTM test standards, this paper presents experimental studies on quasi-static indentation tests on sandwich panels with carbon fiber reinforced facesheet and foam core. The indentation force vs. displacement curves were obtained. A series of tests with different indentation depth were carried out to study the damage modes and damage propagation process of foam core sandwich panels under quasistatic indentation force.

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Quasi-Static Indentation Behaviour of Glass Fibre Reinforced Polymer

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.970.317 ◽

2014 ◽

Vol 970 ◽

pp. 317-319 ◽

Cited By ~ 1

Author(s):

Syed Mohd Saiful Azwan ◽

Yahya Mohd Yazid ◽

Ayob Amran ◽

Behzad Abdi

Keyword(s):

Glass Fibre ◽

Polyester Resin ◽

Loading Rates ◽

Reinforced Polymer ◽

Glass Fibre Reinforced Polymer ◽

Static Indentation ◽

Indentation Tests ◽

Fibre Reinforced Polymer ◽

Glass Fibre Reinforced ◽

Chopped Strand Mat

Fibre reinforced polymer (FRP) plates subject to quasi-static indentation loading were studied. The plates were fabricated from three layers of chopped strand mat glass fibre and polyester resin using vacuum infusion process. Indentation tests were conducted on the plates with loading rates of 1 mm/min, 10 mm/min, 100 mm/min and 500 mm/min using a hemispherical tip indenter with diameter 12.5 mm. The plates were clamped in a square fixture with an unsupported space of 100 mm × 100 mm. The loads and deflections at the indented location were measured to give energy absorption-deflection curves. The results showed that the loading rate has a large effect on the indentation behaviour and energy absorbed.

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Quasi-Static Indentation Properties of Aluminium Foam-Frp Sandwich Panel

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i3.11.15959 ◽

2018 ◽

Vol 7 (3.11) ◽

pp. 193

Author(s):

Ummu Raihanah Hashim ◽

Aidah Jumahat ◽

Muhammad Fashan Md Ghazali

Keyword(s):

Energy Absorption ◽

Sandwich Panel ◽

Polymeric Materials ◽

Aluminium Foam ◽

Core Material ◽

Depth Of Penetration ◽

Basalt Fibre ◽

Reinforced Polymer ◽

Static Indentation ◽

Fibre Reinforced Polymer

Synthetic FRP have been used for many years in wide applications owing to their versatility and good performance. However, environmental problems caused by extensive use of polymeric materials arise mainly due to lack of landfill spaces and depletion of finite resources of fossil raw materials, such as petroleum or natural gas. Hence, materials derived from natural products are emerging as potential substitutes for petroleum-based material. The usage of natural fibre reinforced polymer (NFRP) composite have triggered considerable interest to explore the usefulness of this material. Excellent energy absorption of sandwich-structured composite made it a versatile structure used in various industries such transportation, automotive, building construction and marine. On top of that, the research data on aluminium foam as a core material in sandwich panel are limited and need to be further studied. This research is aimed to determine the quasi-static indentation properties of Basalt Fibre Reinforced Polymer/Aluminium Foam (BF-AF) sandwich panel and compare with the properties of Glass Fibre Reinforced Polymer/Aluminium Foam (GF-AF) sandwich panel. In this study, BFRP and GFRP composites with nanosilica were fabricated using vacuum bagging method. Aluminium foam was used as a core in the sandwich panel structure. The quasi-static indentation tests were performed using 10mm indenter and the specimen size was 50mm x 50mm with thickness of 3mm. The effect of aluminum foam on indentation properties were studied. The results showed that the addition of nanosilica enhanced the energy absorption, depth of penetration and damage area of the composites. The indentation properties of BF-AF were higher than those of GF-AF sandwich panel composites. Therefore, this research contributes to a new knowledge on the properties of aluminium foam-FRP composite materials

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A comparative study on glass and carbon fibre reinforced laminated composites in scaled quasi-static indentation tests

Composite Structures ◽

10.1016/j.compstruct.2020.112327 ◽

2020 ◽

Vol 245 ◽

pp. 112327

Author(s):

Mohamad Fotouhi ◽

Mahdi Damghani ◽

Mun Choong Leong ◽

Sakineh Fotouhi ◽

Meisam Jalalvand ◽

...

Keyword(s):

Comparative Study ◽

Carbon Fibre ◽

Laminated Composites ◽

Static Indentation ◽

Indentation Tests

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Overtrawlability and Mechanical Damage of Pipe-in-Pipe

Journal of Applied Mechanics ◽

10.1115/1.4024877 ◽

2013 ◽

Vol 81 (3) ◽

Cited By ~ 3

Author(s):

Zheng Jiexin ◽

Andrew Palmer ◽

Paul Brunning

Keyword(s):

Finite Element ◽

Static Analysis ◽

Standard Method ◽

Mechanical Damage ◽

Static Indentation ◽

Indentation Tests ◽

Offshore Industry ◽

Impact Phase ◽

High Level ◽

The Impact

A pipeline on the seabed may be struck by moving trawl gear, and that may damage the pipeline. Trenching can be a useful but expensive way to protect the pipeline. Pipe-in-pipe and bundled pipeline systems are widely used in the offshore industry recently because of their high level of thermal insulation and because they lend themselves to rapid and economical installation. However, there is no clearly specified standard method to analyze the overtrawlability of pipe-in-pipe systems. If we apply the same method as for the single wall pipe, it is likely to result in a conservative design for the pipe-in-pipe. The objective of this paper is to investigate the overtrawlability of pipe-in-pipe, especially in the impact phase, and to fill this gap. In this study, the authors demonstrate that a quasi-static analysis can replace a dynamic analysis to some extent because the overall response does not show a big difference. The demonstration is based on both quasi-static indentation tests and impact tests for single wall pipe and pipe-in-pipe, as well as the corresponding finite element (FE) models. The FE models not only help to compare the responses but also offer a way to analyze the overtrawlability of the pipe-in-pipe. The quasi-static FE models are used for a further comparison between a pipe-in-pipe and a 406.4 mm (16 in.) single wall pipe to illustrate the overtrawlability of the pipe-in-pipe.

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Local Mechanical Characterization of Metal Foams by Nanoindentation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.662.59 ◽

2015 ◽

Vol 662 ◽

pp. 59-62 ◽

Cited By ~ 2

Author(s):

Jiří Němeček ◽

Vlastimil Kralik

Keyword(s):

Cell Walls ◽

Plastic Material ◽

Spherical Indentation ◽

Isotropic Hardening ◽

Plastic Properties ◽

Macro Scale ◽

Static Indentation ◽

Indentation Tests ◽

Constitutive Parameters

This paper deals with microstructure and micromechanical properties of two commercially available aluminium foams (Alporas and Aluhab). Since none of the materials is available in a bulk and standard mechanical testing at macro-scale is not possible the materials need to be tested at micro-scale. To obtain both elastic and plastic properties quasi-static indentation was performed with two different indenter geometries (Berkovich and spherical tips). The material phase properties were analyzed with statistical grid indentation method and micromechanical homogenization was applied to obtain effective elastic wall properties. In addition, effective inelastic properties of cell walls were identified with spherical indentation. Constitutive parameters related to elasto-plastic material with linear isotropic hardening (the yield point and tangent modulus) were directly deduced from the load–depth curves of spherical indentation tests using formulations of the representative strain and stress introduced by Tabor.

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Modelling of aluminium foam core sandwich panels under impact perforation

Materials Science and Technology ◽

10.1080/02670836.2015.1122297 ◽

2015 ◽

Vol 32 (13) ◽

pp. 1330-1337 ◽

Cited By ~ 2

Author(s):

A. Babakhani ◽

M. Golestanipour ◽

S. M. Zebarjad

Keyword(s):

Sandwich Panels ◽

Aluminium Foam ◽

Foam Core

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Study on V-Bending of Aluminium Foam Sandwich Panels

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.181-182.281 ◽

2011 ◽

Vol 181-182 ◽

pp. 281-286 ◽

Cited By ~ 1

Author(s):

Zhen Zhong Sun ◽

Wei Feng He ◽

Hai Bin Chen ◽

Sheng Gui Chen ◽

Rong Yong Li

Keyword(s):

Shear Deformation ◽

Transverse Shear ◽

Final Stage ◽

Sandwich Panels ◽

Core Layer ◽

Aluminium Foam ◽

Transverse Shear Deformation ◽

Acceptable Limit ◽

Air Bending

The forming of the completed aluminium foam sandwich (AFS) panels would determine an improvement in the manufacturing of parts and panels. In this paper the authors have investigated the formability of AFS through experiments. the load versus punch stroke curve and deformation procedures of Aluminium foam sandwiche panels was investigated by performing V-bending experiments. A serious problem encountered in the V-bending was bending-induced large transverse shear deformation of the skin-core layer. It causes the delamination of the AFS. It was found from experimental observations that the large shear defomation progresses rapidly only at the final stage of V-bending. Consequently, the air-bending operation for Aluminium foam sandwiche panels is recommended for suppressing the shear deformation of skin-core layer to within an acceptable limit.

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Experimental Study of Sandwich Panels Subjected to Foam Projectile Impact

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.535-536.501 ◽

2013 ◽

Vol 535-536 ◽

pp. 501-504

Author(s):

Mohd Azman Yahaya ◽

Dong Ruan ◽

Guo Xing Lu

Keyword(s):

Metal Foam ◽

Impact Load ◽

Sandwich Panels ◽

Equal Mass ◽

Aluminium Foam ◽

Element Analysis ◽

Measuring Device ◽

Back Face ◽

History Of ◽

The Impact

Similar blast loading characteristics can be obtained using impact of aluminium foam projectiles, which enables blast tests to be mimicked in a laboratory scale and in a safer environment. The purpose of this study is to determine the back-face deflection history of aluminium sandwich panels experimentally by aids of a laser displacement meter when panels are subjected to the impact of metal foam projectiles. This information was usually determined using finite element analysis (FEA) due to the difficulty in the experiment. The projectiles are cylindrical ALPORAS aluminium foam with diameter of 37 mm, length of 50 mm and nominal relative density of 10%. The sandwich panels consist of two 1 mm aluminium face-sheets and an aluminium honeycomb as the core. There are five different core configurations with a brand name of HEXCEL. The projectiles are fired towards the centre of the sandwich panels at different velocities using a gas gun. During the tests, a laser optical displacement measuring device is used to record the history of the back-face deflection experimentally. The deflection of the back-face is found to reach the maximum before coming to rest at a smaller value. The final back-face deflections of the sandwich panels show exponential relationship with the projectile impulse. The final deflections are compared with the deflection of monolithic plates with equal mass. The sandwich panels deflect less than the monolithic plate with an equal mass up to a critical value but continue to increase significantly afterwards. Care should be taken when using sandwich panels as protective structures against foam projectiles as beyond this point, the monolithic plates outperform the sandwich panels in absorbing the impact load.

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