scholarly journals GFRP Bar: Determining Tensile Strength with Bending Test

2015 ◽  
Vol 1083 ◽  
pp. 90-96 ◽  
Author(s):  
Ana Almerich-Chulia ◽  
E. Fenollosa ◽  
I. Cabrera
Keyword(s):  
Tensile Strength ◽  
Flexural Strength ◽  
Small Diameter ◽  
Tensile Tests ◽  
Bending Test ◽  
Bending Tests ◽  
Reliable Test ◽  
Gfrp Bar ◽  
Gfrp Reinforcement ◽  
Gfrp Rebars

In order to obtain GFRP reinforcement bars it is necessary to undertake tests regulated code which require important mechanical tools. This paper presents a method which allows for determining GFRP rebars tensile strength value from their flexural strength value which has been obtained with a simple, inexpensive and reliable test. This method results will be verified by applying it to values obtained in a series of bending tests and comparing these results with values obtained in tensile tests. Values concordance for small diameter GFRP rebars is very good.

The Effects on Tensile Properties of Different Winding Way on GFRP Bar

2013 ◽  
Vol 438-439 ◽  
pp. 357-360
Author(s):  
Yu Yang Pang ◽  
Pu Zhang ◽  
Dan Ying Gao ◽  
Fei Mo
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Modulus Of Elasticity ◽  
Tensile Tests ◽  
Test Results ◽  
Shear Properties ◽  
Gfrp Bars ◽  
Ultimate Elongation ◽  
Gfrp Bar ◽  
Gfrp Reinforcement

The influence of different surface forms on GFRP reinforcement mainly manifest in bonding between reinforcement materials and concrete, especially when the GFRP bars are used in slope, the form of the surface of GFRP bar will affect reinforced materials torsion and shear properties directly. This article made some tensile tests on several different surface forms of GFRP reinforcement, and learned that the form of the surface wound of GFRP bar make the influence on tensile strength, ultimate elongation and modulus of elasticity. Test results show that the surface of the winding way will affect on the tensile strength, ultimate elongation and modulus of elasticity of GFRP bar.

scholarly journals Study of dependence between microstructure and chemical composition of A32, D32, E32 grades steels at bending tests

2019 ◽  
Vol 75 (1) ◽  
pp. 57-67
Author(s):  
L. A. Ryabicheva ◽  
R. E. Velikotskii
Keyword(s):  
Tensile Strength ◽  
Science Studies ◽  
Product Yield ◽  
Negative Influence ◽  
Mechanical Tests ◽  
Bending Test ◽  
Carbon Equivalent ◽  
Metal Science ◽  
Steel Rolling ◽  
Bending Tests

Meeting the high requirements to the whole complex of mechanical characteristics is the main criteria of reliability and long service life of shipbuilding steels. To determine them it is necessary to apply modern methodologies of metal science analysis. Revelation of regularity of influence of alloying, carbon equivalent, microstructure and production technology on results of bending test of low-alloyed grades А32, D32, Е32 shipbuilding steels was the purpose of the study. Production of steel, rolling, thermal treatment, mechanical tests and metal science studies of the low-alloyed shipbuilding steels was made in Alchevsk steel-works. A quantity estimation of the D32 grade sheets microstructure was made as a result of studies, having both satisfactory and not satisfactory results of bending tests. It was determined, that stitch oxides have the most negative influence on the results of bending tests for both hot-rolled and normalized sheets. Sheets with not satisfactory results of bending tests differ from those, which passed the tests by higher value of streakiness points, particular of perlite, and in normalized condition – by higher value of Widmanstatten pattern. Sheets, which did not passed the tests, have yield strength by 5–25 MPa and tensile strength by 14–39 MPa higher, while the tensile strength was by 1.2–4.8% lower. For stable yield in bending tests within 98–100% it is necessary the tensile strength level to be not less than 30%. It is reasonably all the sheets of 10–20 mm thick out of heats with carbon equivalent higher 0.54% to subject compulsory normalization. Further increase of the sheets product yield can be achieved by decreasing of phosphor mass share and increasing of general steel purity, first of all, by decreasing of oxide inclusions

Aspects of Testing and Material Properties of Fiber Concrete

2019 ◽  
Vol 292 ◽  
pp. 9-14 ◽  
Author(s):  
Oldrich Sucharda ◽  
Vlastimil Bilek
Keyword(s):  
Tensile Strength ◽  
Material Properties ◽  
Bending Test ◽  
Test Results ◽  
Functional Dependencies ◽  
Split Tensile Strength ◽  
Bending Tests ◽  
Fibre Concrete ◽  
Fiber Concrete ◽  
Concrete Mixer

Concrete is typical composite material and its properties can be very variable. Material properties are also influenced with the technology of processing, manufacturing and treatment after concreting. Reinforcement in form of fibers is often added for improving tensile strength. This paper deals with specific testing of fibre concrete. Test results of series of specimens are presented for selected transport concrete composition, which is reinforced with amount of fibers 25, 50, 75 kg / m3. Fibers were added directly into the into the concrete mixer in the factory. Each series includes more than 25 test samples. The tests include the compressive strength of a cube and cylindrical, testing of modulus of elasticity, and the split tensile strength in the direction perpendicular to and parallel to the filling. Within the research project also a few types of bending tests were performed. Four variants of bending test that vary in span of 500 or 600 mm, samples with and without a notch, and in a three- / four-point configuration. As a summary, broader evaluation and functional dependencies are derived.

scholarly journals Report on laboratory tests of sandstone and porphyry for rock fracture analysis

2020 ◽  
Vol 19 (2) ◽  
pp. 087-100
Author(s):  
Jakub Gontarz ◽  
Jacek Szulej
Keyword(s):  
Tensile Strength ◽  
Rock Fracture ◽  
Strain Energy Release ◽  
Mechanical Tests ◽  
Bending Test ◽  
Compression Tests ◽  
Bending Tests ◽  
Three Point Bending ◽  
Bending Of Beams ◽  
Brazilian Method

The paper presents the results of mechanical tests of three types of rocks from stone mines in Poland. Compression tests of cubic samples, three-point bending tests of beams, bending of beams with notch and testing of tensile strength using the quasi-Brazilian method were performed. Based on the tests, the compressive strength, tensile strength, Young's modulus, and Poisson's ratios were determined. The stress intensity factor and critical strain energy release rate in mode I were determined from the bending test of the notched beams. The determined values were used as parameters of computer models which are used to verify the authors’ method of predicting the crack propagation in the Abaqus FEA system.

scholarly journals Reliability of Different Bending Test Methods for Dental Press Ceramics

Materials ◽  
2020 ◽  
Vol 13 (22) ◽  
pp. 5162
Author(s):  
Daisuke Miura ◽  
Yoshiki Ishida ◽  
Taira Miyasaka ◽  
Harumi Aoki ◽  
Akikazu Shinya
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
Test Methods ◽  
Bending Test ◽  
Biaxial Bending ◽  
Bending Tests ◽  
Four Point Bending ◽  
Biaxial Tests ◽  
Biaxial Flexural Strength ◽  
Flexural Tests

Objective: This study investigates the reliability of different flexural tests such as three-point-bending, four-point bending, and biaxial tests, in strengthening the dental pressed ceramics (DPCs) frequently used in clinical applications. Methods: The correlations between the three types of bending tests for DPCs were investigated. Plate-shaped specimens for the three-point and four-point bending tests and a disc-shaped specimen for the biaxial bending test were prepared. Each bending test was conducted using a universal testing machine. Results: The results for six DPCs showed that the flexural strength in descending order were the three-point flexural strength, biaxial flexural strength, and four-point flexural strength, respectively. Then, a regression analysis showed a strong correlation between each of the three test methods, with the combination of four-point and biaxial flexural strength showing the highest values. The biaxial flexural strength was not significantly different in the Weibull coefficient (m) compared to the other tests, with the narrowest range considering the 95% interval. The biaxial bending test was found to be suitable for materials with small plastic deformation from the yield point to the breaking point, such as DPCs.

scholarly journals Basalt reinforced concrete structures for retrofitting concrete surfaces

2018 ◽  
Vol 199 ◽  
pp. 09014
Author(s):  
Benjamin Wolf ◽  
Andrea Kustermann ◽  
Christian Schuler ◽  
Christoph Dauberschmidt ◽  
Ömer Bucak
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Load Capacity ◽  
Weather Conditions ◽  
Bending Test ◽  
Basalt Fibre ◽  
Bending Tests ◽  
Three Point Bending ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer

Reinforced concrete facades exist since decades exposed to natural weather conditions. Thus nowadays lot of them are damaged by carbonation induced corrosion and therefor require repairing and retrofitting. The aim of this research project is to investigate the possibilities of basalt fibre reinforced concrete as repairing material and also basalt rebars as additional strengthening reinforcement. Investigations with basalt fibre reinforced mortar prisms showed best results in 3 point bending tests, tensile strength and also compressive strength using 0.3 Vol.-% basalt fibres in mixture. The mechanical properties of basalt rebars made of basalt fibre reinforced polymer were tested, showing higher values in tensile strength and Young´s Modulus than comparable steel reinforcement samples. The basalt rebar reinforced concrete samples achieved higher ultimate loads in three-point bending test compared to SRC samples. But after failure in the bonding area no residual load capacity remained. Finally basalt reinforcement bars seems to be well suited for use as retrofitting material for facade elements, but numerous properties have to be examined in further investigations.

The Influence of an Infill Density, Percent on the Flexural Strength of the 3D

2020 ◽  
Vol 870 ◽  
pp. 73-80
Author(s):  
Nuha Hadi Jasim Al Hasan
Keyword(s):  
Tensile Strength ◽  
3D Printing ◽  
Flexural Strength ◽  
Layer Thickness ◽  
Polylactic Acid ◽  
Fused Deposition Modeling ◽  
Bending Test ◽  
Layer By Layer ◽  
Fused Deposition ◽  
Deposition Modeling

3D printing innovation, as a quick prototyping, utilize plastic or metal as the crude material to print the genuine parts layer by layer. In this way, it is likewise called added substance producing procedure. Contrasted and conventional assembling innovation, 3D printing innovation has evident points of interest in assembling items with complex shapes and structures. Fused deposition modeling (FDM) is one of the most broadly utilized 3D printing advances. Fibers of thermoplastic materials, for example, polylactic acid is for the most part utilized as crude materials. The present examination will concentrate on the effect of the infill density, percent on the flexural strength of polylactic acid. Bending test was performed on different infill density, percent of specimens. According to ASTM D638.14 standards, samples for testing are made in different infill density, percent (20, 30, 40, 50 and 60 %) by using a polylactic acid in 3D machine printing and their tensile tested and the parameters include different fill density, layer high of 0.1 mm , 0.2mm and 0.3 have an effect on the mechanical characterized while the time of printing the sample would be increased with increasing of fill density%. The tensile strength of polylactic acid samples was found at different fill density and a layer thickness. According to test measuring results that the tensile strength, maximum 47.1,47.4, and 48 MPa at 30%,40%,and 50% fill density respectively and 0.1mm height layer and the tensile strength minimum at 60% and 70 % fill density and 0.1 mm height layer thickness. The higher strength results as higher layer thickness 0.3 mm as compared with 0.1 and 0.2 at 30%fill density.

Effect of Dry-Wet Circulation and Temperature Change on Properties of Polyurea Coatings

2010 ◽  
Vol 150-151 ◽  
pp. 1203-1208 ◽  
Author(s):  
Ping Lv ◽  
Xin Mao Li ◽  
Wei Bo Huang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Temperature Change ◽  
Bending Test ◽  
Curing Time ◽  
Bending Tests ◽  
Temperature Changes ◽  
Before And After ◽  
Alternating Temperature ◽  
Changing Rate

This paper mainly studies the mechanical properties and microstructure of polyurea coatings (SPUA) through the experiment of dry-wet circulation. The influence of different curing time of SPUA coating before and after the dry cycle of the mechanical properties and surface morphology changes were researched. Use the alternating temperature and low bending tests to research,the variation of temperature changes to the SPUA of different curing time. The result of the dry-wet circulation experiment shows that the tensile strength of cured 1d, 3d and 7d SPUA coating after 30d dry-wet circulation increased 9.6%、19.2% and 44.7% respectively, the tear strength increased 3.2%、5.6% and 47.3% respectively. The microstructure research shows the 7d cured SPUA coating after 30 times dry-wet circulation will reduce the holes and narrow the hole diameter in a certain degree. The temperature change experimental results show that during -20 ～50 alternating temperature process, the tensile strength of the coating appears to increase, 3d and 7d cured SPUA coating after 40d temperature alternating tensile strength changing rate is -14.2% and 9.8% respectively. Low-temperature bending test shows that the SPUA coating will not appear any cracks cracking phenomena after placed the coating in （-20+2 ）for 168h.

scholarly journals Mechanical Properties of Heat Cured Acrylic Resin Reinforced with Natural Sisal Fibers Powder

2021 ◽  
Vol 2114 (1) ◽  
pp. 012023
Author(s):  
Teba M. Hameed ◽  
Balqees M. Al-Dabbagh ◽  
Ragdaa K. Jasim
Keyword(s):  
Tensile Strength ◽  
Impact Strength ◽  
Flexural Strength ◽  
Acrylic Resin ◽  
Impact Testing ◽  
Bending Test ◽  
Heat Cure ◽  
Significant Difference ◽  
Sisal Fibers ◽  
The Impact

Abstract Materials and Methods: In total, 90 specimens were prepared to be used in the study. The specimens were divided into (3) main groups depended on the presence of sisal fibers powder, first group (30) specimens of heat cure PMMA without additives (control), second and third experimental groups of 60 specimens of heat cure PMMA with salinized sisal fibers powder with two different weight percentages (1 and 3%) wt. Three point bending test was used to measure the flexural strength of the specimens, while the impact strength was done by impact testing Charpy’s machine and tensile test was performed according to ASTM (D-638). Data analysis was performed using (ANOVA) test. The results of this study refer to a highly significant in the flexural strength and tensile strength of specimens reinforced with sisal fibers powder compared with control specimens. Non-significant difference was detected in impact strength among the reinforced groups and control gro. Reinforcement of acrylic resin with natural sisal fibers powder affects its flexural strength and tensile strength with non-significant in impact strength.

Mechanical Behavior of 980MPa NANOHITENTM at Elevated Temperatures and its Effect on Springback in Warm Forming

2014 ◽  
Vol 611-612 ◽  
pp. 11-18 ◽  
Author(s):  
Toru Minote ◽  
Yoshimasa Funakawa ◽  
Naoko Saito ◽  
Mitsugi Fukahori ◽  
Hiroshi Hamasaki ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Stress Relaxation ◽  
Mechanical Behavior ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Tensile Tests ◽  
Warm Forming ◽  
Bending Test ◽  
Uniaxial Tensile ◽  
High Tensile Strength

High tensile strength steel sheets have large springback after being formend at room temperature. Warm forming can be a solution to reduce springback of high tensile strength steel parts. NANOHITENTM is a high strength ferritic steel precipitation-strengthened by nanometer-sized carbides developed by JFE Steel Corporation. Tensile strength of the steel at room temperature does not change before and after deformation at elevated temperatures up to 873K since the carbides in the steel are stable at high temperatures less than 973K. Therefore, the steel is suitable for warm forming. Springback of 980MPa NANOHITENTM parts warm formed at 873K is the same level of that of cold formed conventional 590MPa steel parts. In this study, two kinds of material testing at room temperature and at elevated temperatures between 573K and 937K were performed to understand the mechanical behavior of 980MPa NANOHITENTM: uniaxial tensile tests and bending tests. The steels flow stress depends on not only material temperature but also strain rate in uniaxial tensile tests. After a bending test, the specimen shows springback measured by the change of an angle between the two sides. Stress relaxation happens while a test specimen is held at the bottom dead point after bending. And the stress relaxation could be used to reduce springback of warm formed parts.

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