scholarly journals Interaction of inter- and intralaminar damage in scaled quasi-static indentation tests: Part 1 – Experiments

2016 ◽  
Vol 136 ◽  
pp. 712-726 ◽  
Author(s):  
E. Abisset ◽  
F. Daghia ◽  
X.C. Sun ◽  
M.R. Wisnom ◽  
S.R. Hallett
Keyword(s):  
Static Indentation ◽  
Indentation Tests

QUASI-STATIC INDENTATION TESTS ON POLYURETHANE AND PHENOLIC FOAM SANDWICH PANELS

2017 ◽  
Vol 13 (1) ◽  
pp. 15
Author(s):  
MUDASSIR SYED ◽  
HUSSAIN MANZOOR .M ◽  
SHANKAR RAVI.D.V. ◽  
◽  
◽  
...  
Keyword(s):  
Sandwich Panels ◽  
Phenolic Foam ◽  
Static Indentation ◽  
Indentation Tests

Quasi-Static Indentation Behaviour of Glass Fibre Reinforced Polymer

2014 ◽  
Vol 970 ◽  
pp. 317-319 ◽  
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.

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

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

Quasi-static indentation tests on aluminium foam sandwich panels

2010 ◽  
Vol 92 (9) ◽  
pp. 2039-2046 ◽  
Author(s):  
Dong Ruan ◽  
Guoxing Lu ◽  
Yat Choy Wong
Keyword(s):  
Sandwich Panels ◽  
Aluminium Foam ◽  
Static Indentation ◽  
Indentation Tests

Overtrawlability and Mechanical Damage of Pipe-in-Pipe

2013 ◽  
Vol 81 (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.

Local Mechanical Characterization of Metal Foams by Nanoindentation

2015 ◽  
Vol 662 ◽  
pp. 59-62 ◽  
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.

scholarly journals Post-Impact Investigation of CFRP Laminated Plate

2014 ◽  
Vol 71 (2) ◽  
Author(s):  
H.A Israr ◽  
N. Hongkarnjanakul ◽  
S. Rivallant ◽  
C. Bouvet
Keyword(s):  
Impact Analysis ◽  
Image Correlation ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Cfrp Laminates ◽  
Static Indentation ◽  
Indentation Tests ◽  
Post Impact ◽  
Carbon Fibre Reinforced Plastic ◽  
Delamination Area

This paper deals with low-velocity impact and quasi-static indentation tests on carbon fibre reinforced plastic (CFRP) laminates that classically used in aeronautical applications. The aim is to carry out post-impact analysis using Vic 3-D digital image correlation to investigate the behaviour of permanent indentation which is an important condition for the damage tolerance justification in composite. Result shows the indentation depth decreased with the time due to relaxation of the specimen until at certain position. The microscopic observations were carried out to understand the phenomenon.  Besides that, the post-mortem analyses on the impacted plate were also carried out through microscopic observation to determine the delamination area at each interface which is normally difficult to extract from the C-Scan result. The observations were made at three different sections cut (0°, 90° and 45°). The results of delamination area obtained from both microscopic and C-scan analysis is compared and there are rather satisfying to each other.

Static Indentation Response of H30 Foam ‐ an Experimental and Computational Study

2008 ◽  
Vol 4 (3) ◽  
pp. 255-266 ◽  
Author(s):  
V. Rizov ◽  
A. Mladensky
Keyword(s):  
Computational Study ◽  
Computer Code ◽  
Damage Resistance ◽  
Rigid Foam ◽  
Modeling Procedure ◽  
Static Indentation ◽  
Nonlinear Character ◽  
Indentation Tests ◽  
Overall Bending ◽  
Indentation Response

This article presents an approach for assessing the damage resistance of H30 rigid foam subjected to local static loading. The main goal of the experimental part of this paper is to obtain the loaddisplacement response of foam beam specimens under static indentation by steel cylindrical indentors for both loading (indentation) and unloading stages. The instant residual dent magnitude is also measured in the testing. The nonlinear character of the mechanical behavior and the formation of a residual dent (after unloading) are attributed to local crushing of the foam in the zone directly under the indentation area. A visual inspection of a lateral surface of the foam specimens after indentation tests revealed that the local damage underneath the indentor consists of crushed and highly compacted foam, while the rest of the specimen is almost undeformed. A two‐dimensional numerical model is developed to simulate the static indentation response using the ABAQUS computer code. No overall bending of the foam specimens is assumed. The finite element modeling procedure takes into account both physical and geometrical non‐linearities. In order to simulate the plastic part of the response, the model employs the *CRUSHABLE FOAM and *CRUSHABLE FOAM HARDENING options. The modeling procedure is capable of analyzing indentation as well as unloading of foam beam specimens. Thus, the instant residual dent can be predicted. Results generated by this model exhibit good correlation with indentation tests data, thus substantiating its validity.

Study on behaviour of geometrically scaled glass reinforced epoxy tubes subjected to non-coincident quasi static-indentation

2018 ◽  
Vol 9 (5) ◽  
pp. 675-692
Author(s):  
Fahad Almaskari ◽  
Farrukh Hafeez
Keyword(s):  
Peak Load ◽  
Repeated Loading ◽  
Damage Growth ◽  
Content Type ◽  
Starting Point ◽  
Static Indentation ◽  
Indentation Tests ◽  
Loading And Unloading ◽  
Force Displacement ◽  
Practical Implications

Purpose The purpose of this paper is to study the behaviour of glass reinforced epoxy tubes subjected to repeated indentation loads at two non-coincident indentations 180° apart. Design/methodology/approach Four geometrically scaled specimens ranging from 100 to 400 mm diameter were used in repeated indentation tests. Force, displacement and damage growth were recorded for loading and unloading until the indenter returned to its original starting point. Findings Similar scaled trends were observed between the non-coincidental loadings. Unlike reported response form coincidental loadings, the responses from non-coincidental loadings yield lower values for bending stiffness and peak load. Research limitations/implications The differences in behaviour of the specimen between non-coincident loadings were attributed to reductions in fracture toughness and circumferential modulus. Practical implications Distant non-interacting damage and delamination around the circumference does reduce the structural performance. Originality/value Behaviour of composite tubes under different loading conditions, for example low speed impact or quasi static indentation, is widely studied, however little attention has been given to the repeated loading incidents.

Temperature effect on the mechanical properties and damage mechanisms of a glass/thermoplastic laminate

2019 ◽  
Vol 54 (17) ◽  
pp. 2271-2282 ◽  
Author(s):  
L Cadieu ◽  
J B Kopp ◽  
J Jumel ◽  
J Bega ◽  
C Froustey
Keyword(s):  
Mechanical Properties ◽  
Crack Propagation ◽  
Temperature Effect ◽  
Maximum Load ◽  
Damage Mechanisms ◽  
Static Indentation ◽  
Different Temperatures ◽  
Indentation Tests ◽  
Influence Of Temperature On ◽  
Kinetics Of

The aim of this study is to evaluate the temperature effect on the mechanical properties and damage mechanisms of a Glass/Elium 150 laminate composite. Quasi-static indentation tests are carried out at different temperatures to highlight the temperature dependency of different parameters of the samples (stiffness, maximum load, stored elastic energy, and applied energy). The different damage mechanisms involved in the collapse of the composite are observed at the macro-, meso-, and micro-scopic scales using optical and scanning electron microscopy. The influence of temperature on these damage mechanisms is discussed based on post-mortem observations. It has been highlighted that the kind and the severity of damage are strongly temperature dependent. Below 20℃, fiber breakage, strand failure, intra- and inter-laminar crack propagation are identified. At 60℃, plastic flow of the polymer matrix is observed, which modifies micro-crack propagation at the fiber/matrix interface. Above 90℃, only intra-laminar micro-cracking occurs. To conclude, based on all these observations the kinetics of damage appearance are discussed.

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