The Effects of Hydrothermal Ageing on the Crushing Behavior of Glass/Epoxy Composite Pipes

2015 ◽  
Vol 819 ◽  
pp. 411-416
Author(s):  
S.N. Fitriah ◽  
M.S. Abdul Majid ◽  
R. Daud ◽  
M. Afendi ◽  
Z.S. Nazirah
Keyword(s):  
Composite Laminates ◽  
Testing Machine ◽  
Hydrothermal Condition ◽  
Compression Tests ◽  
Universal Testing ◽  
Failure Region ◽  
The Matrix ◽  
Glass Fibre Reinforced ◽  
Crushing Behavior ◽  
Composite Pipes

The paper discusses the crushing behavior of glass fibre reinforced epoxy (GRE) pipes under hydrothermal ageing condition. This study determines the behavior of the GRE pipes when subjected to different ageing periods and temperatures. Hydrothermal ageing has been found to cause degradation between resin and fibre interface thus causing the reduction in the strength of composite laminates. The pipes were subjected to hydrothermal condition to simulate and precipitate ageing by immersing the pipe samples in water at 80°C for 250, 500, and 1000 hours. Compression tests were carried out using Universal Testing Machine (UTM) for virgin condition and aged samples in accordance with ASTM D695 standard. The maximum force at the initial failure region is observed for each of the conditioned pipes. The results show that the strength of the matrix systems was considerably degraded due to the plasticization of the matrix system.

The Effects of Winding Angles and Elevated Temperatures on the Crushing Behaviour of Glass Fibre/Epoxy Composite Pipes

2014 ◽  
Vol 695 ◽  
pp. 639-642
Author(s):  
S.N. Fitriah ◽  
M.S. Abdul Majid ◽  
R. Daud ◽  
Mohd Afendi
Keyword(s):  
Compressive Strength ◽  
Glass Fibre ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Testing Machine ◽  
Universal Testing ◽  
Glass Fibre Reinforced ◽  
Crushing Behavior ◽  
Composite Pipes ◽  
Winding Angle

The paper discusses the crushing behavior of various winding angles of glass fibre reinforced epoxy (GRE) pipes at elevated temperatures. Two different winding angles of composite pipes were chosen for the study; ± 55°, ± 63°. GRE pipes angled ± 55° and ± 63° are compressed using Universal Testing Machine (UTM) at room temperature and elevated temperatures of 45°C, 65°C, and 95°C according to ASTM D695-10 standard. The temperatures were chosen based on the glass transition temperature (Tg) that was measured earlier. The results show that as the temperature is increased, the compressive strength significantly degraded. This is due to the change in the properties of the GRE pipe from a rigid state to a more rubbery state as the composite pipe reached Tg. GRE pipe with winding angle ± 55° show a higher compressive strength compared to ± 63°.

Dynamic and Quasi-Static Compressive Deformation Behaviour of Polyimide Foam at Various Elevated Temperature

2014 ◽  
Vol 566 ◽  
pp. 158-163 ◽  
Author(s):  
A. Yosimoto ◽  
Hidetoshi Kobayashi ◽  
Keitaro Horikawa ◽  
Keiko Watanabe ◽  
Kinya Ogawa
Keyword(s):  
Compressive Strength ◽  
Room Temperature ◽  
Deformation Behaviour ◽  
Testing Machine ◽  
Negative Temperature ◽  
Strain Rates ◽  
Compression Tests ◽  
Hopkinson Pressure Bar ◽  
Universal Testing ◽  
Pressure Bar

In order to clarify the effect of strain rate and test temperature on the compressive strength and energy absorption of polyimide foam, a series of compression tests for the polyimide foam with two different densities were carried out. By using three testing devices, i.e. universal testing machine, dropping weight machine and sprit Hopkinson pressure bar apparatus, we performed a series of compression tests at various strain rates (10-3~103s-1) and at several test temperatures in the range of room temperature to 280 ̊C. At over 100 s-1, the remarkable increase of flow stress was observed. The negative temperature dependence of strength was also observed.

scholarly journals Characterization of Composite Laminates Subjected to Repeated Indentation

2014 ◽  
Vol 14 (2) ◽  
pp. 46-56
Author(s):  
M. Ashok Kumar ◽  
A.M.K. Prasad ◽  
D.V. Ravishankar ◽  
G. Giridhar
Keyword(s):  
Stainless Steel ◽  
Bearing Capacity ◽  
Fiber Orientation ◽  
Composite Laminates ◽  
Testing Machine ◽  
High Strength ◽  
Surface Damage ◽  
Load Bearing Capacity ◽  
Universal Testing

Abstract The effect of the fiber orientation in a laminate is investigated experimentally when subjected repeated quasistatic indentation. All the laminates with different fiber orientation are subjected to indentation with a stainless steel spherical indenter of diameter 8.0mm on a universal testing machine for a maximum indenter displacement of 4mm. The rate of indenter displacement was 0.5mm/minute. Different parameters like load bearing capacity, indentation diameter, area of surface damage, etc., were recorded after 4mm of indenter displacement. All the parameters were studied and compared to evaluate the laminate with high strength

Study on Dynamic Performance of Silica Fume Concrete

2012 ◽  
Vol 204-208 ◽  
pp. 3782-3785 ◽  
Author(s):  
Wei Wu ◽  
Chao Zhang ◽  
Kai Hang Wu
Keyword(s):  
Silica Fume ◽  
Static Load ◽  
Dynamic Performance ◽  
Testing Machine ◽  
Impact Resistance ◽  
Plain Concrete ◽  
Compression Tests ◽  
Dynamic Impact ◽  
Universal Testing ◽  
Compressive Strength Of Concrete

Do static load compression tests and dynamic impact tests on concrete specimens containing different silica fume contents with universal testing machine and SHPB experiment device to study strength mechanism of silica fume concrete. The results show that silica fume can significantly improve compressive strength of concrete. The best content is 16% and its impact resistance increases by 27% compared with plain concrete.

scholarly journals EXPERIMENTAL AND NUMERICAL STUDIES ON MULTI-BOLT DOUBLE COVER BUTT JOINTED GLASS FIBRE REINFORCED COMPOSITE LAMINATES WITH ALUMINIUM BUTT STRAPS

2020 ◽  
Vol 6 (5) ◽  
pp. 1-40
Author(s):  
S. S. Subramanya Sastry ◽  
Sivanagaraju Reddy ◽  
K. Naresh Babu
Keyword(s):  
Glass Fibre ◽  
Composite Laminates ◽  
Testing Machine ◽  
Experimental Studies ◽  
Tensile Load ◽  
Double Cover ◽  
Specimen Thickness ◽  
Element Analysis ◽  
Reinforced Composite ◽  
Glass Fibre Reinforced

Numerical and experimental studies on multi-bolt double cover butt jointed glass fibre reinforced composite laminates with Aluminium butt straps (size 270 x 72 x 3/4/5 mm) subjected to a tensile load are presented. Experiments were conducted using the assembled specimens in Instron testing machine under uniaxial load. The test specimens exhibited bearing failure of the laminate at all bolt points followed by net tension failure along the line of bolts close to the grips. Investigation are conducted to study the effects of material composition, consistency of fabrication, bearing-bypass interaction / damage onset, specimen thickness on the stress-strain behaviour of the specimen, load distribution in bolts, types of fit and friction, material anisotropy and contact condition under bolt preload. Influence of these parameters on the contact stresses around the bolt and stresses in the butt straps are discussed. Finite element analysis was carried out using ANSYS for various parameters and results were compared with test data.

Mechanical and Morphological Properties of Epoxy Based Hybrid Composites Reinforced with Banana-Pineapple Fiber

2018 ◽  
Vol 1148 ◽  
pp. 3-11
Author(s):  
Jami Madhukiran ◽  
Ch. Ramabhadri Raju ◽  
S. Madhusudan ◽  
R. Umamaheswara Rao
Keyword(s):  
Natural Fiber ◽  
Hybrid Composites ◽  
Testing Machine ◽  
Weight Fraction ◽  
Sem Analysis ◽  
Morphological Properties ◽  
Banana Fiber ◽  
Universal Testing ◽  
Dog Bone ◽  
The Matrix

The aim of this paper is to investigate the mechanical properties of Banana-Pineapple natural fiber reinforced epoxy hybrid composites. The hybrid combination of fibers with various weight fractions i.e. (40/0, 30/10, 20/20, 10/30 and 0/40) are incorporated into the epoxy LY556 and HY951and hand layup technique is used for fabrication. Initially fibers are cut to a length of 5mm and weight percentagesare determined. Banana fiber was hybridized with Pineapple fiber. While overall fiber weight fraction was fixed as 0.4Wf. Tensile, Flexural and Impact specimens are prepared according to ASTM standards. The Dog-bone shaped specimens are prepared for tensile test. Tensile testing was conducted on 5 ton universal testing machine (FIE Make). Flat bar and V-notch shaped specimens are prepared for conducting Flexural, Impact tests.The results are compared with pure Banana and pure Pineapple. Tensile, Flexural and Impact properties of Hybrid Composites are improved as compared to pure composites. The interfacial relationships between the fiber and matrix, internal cracks, fiber pullout, fiber dispersion into the matrix and the inner surfaces of the specimens are examined through SEM analysis.

A Methodology for the Evaluation of Mechanical Properties of Sausage Based on Tensile and Compression Tests

2005 ◽  
Vol 1 (3) ◽  
Author(s):  
Fabiane Guerra Daros ◽  
Sandro Campos Amico ◽  
Maria Lucia Masson
Keyword(s):  
Mechanical Properties ◽  
Strain Rate ◽  
Testing Machine ◽  
Food Product ◽  
Travel Speed ◽  
Compression Tests ◽  
Strain Behavior ◽  
Universal Testing ◽  
Section Shape ◽  
Specimen Shape

The food product called sausage is a meat emulsion in which the fat drops are dispersed in an aqueous matrix containing soluble proteins, other muscle components and conjunctive tissue. The rheological behavior of sausage needs to be known in order to monitor the quality and acceptance of this product and the evaluation of its response, for instance, to different packaging situations, which is a result of their stress-strain behavior when subjected to a particular static or dynamic stress. A methodology for the assessment of mechanical properties of sausage has been developed. A universal testing machine was used and tests were carried out in sausage available in the market to validate the methodology. Tensile and compression tests were carried out and test conditions were varied, including strain rate and specimen shape and temperature. The influence of the skin on the determinations was also assessed. The need to control cross-section shape was identified, and a dumb-bell and a cylinder specimen shape were proposed for tensile and compression tests, respectively. Temperature is critical and higher temperatures decrease tensile and compressive strengths. Sausage resistance is also sensitive to the strain rate, especially at low values. A travel speed of 50 mm/min seems to be appropriate since variations around this value did not affect tensile or compressive strength determinations. The presented methodology was found adequate to the intended objectives, producing reliable and reproductive results.

scholarly journals Synthesis and Characterization and Properties Comparison of Epoxy Filled Filler Millet (Ragi) Filler and Treated Sacharun offinarum (Sugar Cane) Fiber Reinforced Composites

2015 ◽  
Vol 51 ◽  
pp. 41-46 ◽  
Author(s):  
U. Mahaboob Basha ◽  
D. Mohana Krishnudu ◽  
P. Hussain ◽  
K. Manohar Reddy ◽  
N. Karthikeyan ◽  
...  
Keyword(s):  
Room Temperature ◽  
Hybrid Composites ◽  
Thermo Gravimetric Analysis ◽  
Testing Machine ◽  
Gravimetric Analysis ◽  
Reinforced Composites ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Universal Testing ◽  
The Matrix

In the current work epoxy resin is chosen as matrix, treated Sacharum offinarum ( SugarCane) fiber, filler millet(Ragi) filler is chosen as reinforcement. Room temperature cured Epoxy System filled with Sacharum offinarum fiber and filler millet (Ragi) filler is synthesised by mechanical shear mixer, then kept in a Ultra sonic Solicitor for better dispersion of filler millet (Ragi) filler in the matrix. Different weights of modified filler millet(Ragi) filler (1,2,3,4,5 gm wt) has been incorporated into the Epoxy matrix in order to study the variation of Mechanical and Thermal properties.Mechanical properties like Flexural strength, Tensile strength and impact strength of the micro hybrid composite are studied by UTM (Universal Testing Machine). Thermal properties of micro hybrid composites are studied using Thermo Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC).

scholarly journals Comparisons between some composites reinforced with corn leaves and different matrices

2021 ◽  
Vol 343 ◽  
pp. 01002
Author(s):  
Alexandru Ioan Rădoi ◽  
Cosmin Mihai Miriţoiu ◽  
Claudiu Nicolicescu
Keyword(s):  
Tensile Test ◽  
Mechanical Characteristics ◽  
Breaking Strength ◽  
Testing Machine ◽  
Young Modulus ◽  
Rectangular Section ◽  
Polyester Resins ◽  
Elongation At Break ◽  
Universal Testing ◽  
The Matrix

In this paper we build some composite materials reinforced with corn leaves. In order to build the samples, we have firstly created some strips in this way: we put the corn leaves, continuously, on a sheet of paper where we apply a this layer of resin (we have used epoxy and polyester ones). We have waited for the resin polymerization 48 hours, recommended by the producer. We have put the corn leaves layers in the director of the tensile test (because we will test the samples to tensile). We have made 10 strips and we have glued them together by using the same synthetic resins (epoxy and polyester). In the end we have obtained some composites reinforced with strips from corn leaves and paper sheet, and the matrix is made from epoxy and polyester resins. From the obtained plate, we have cut some samples in order to study their statically mechanical characteristics by tensile test. The samples were tested on an universal testing machine INSTRON 1000 HDX which is assisted by a software called Bluehill. The samples have a rectangular section We have determined: the elongation at break, the breaking strength and the Young modulus. We have also studied the samples breaking area..

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