scholarly journals Evaluation of FRP Bars under Compression and Their Performance in RC Columns

Materials ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 4541 ◽  
Author(s):  
Laith AlNajmi ◽  
Farid Abed
Keyword(s):  
Mechanical Properties ◽  
Cross Sections ◽  
Total Force ◽  
Compression Tests ◽  
Rc Columns ◽  
Static Compression ◽  
Compression Members ◽  
Different Diameters ◽  
Glass Frp ◽  
Frp Bars

The behavior of fiber-reinforced polymer (FRP) bars under compression is not fully understood yet due to the limited research in this area. However, the long-term durability, weathering resistance, and exceptional mechanical properties of FRP bars justify the need for their use in compression members. The main objectives of this study are to evaluate the mechanical properties of glass FRP (GFRP) and basalt FRP (BFRP) bars under compression and examine their performances as main longitudinal reinforcements in reinforced concrete (RC) columns. In the first part of this research, a series of static compression tests were conducted on GFRP and BFRP bars of different diameters. The second part of this research numerically investigated the behavior of FRP-RC columns under concentric and eccentric loading using the mechanical properties of the FRP bars obtained experimentally. Nonlinear finite element models were developed to simulate the compressive behavior of the concrete columns reinforced with GFRP and BFRP bars. The FE models were verified with the experimental results conducted previously. The verified FE models are then utilized to conduct a parametric analysis considering two different column geometries and cross-sections, five reinforcement ratios, two concrete compressive strengths, three types of ties materials, and several loading eccentricities to develop a set of interaction diagrams that may provide valuable data for design purposes. The results indicated that the FRP bars could have a significant contribution to the overall capacity of FRP-RC columns by up to 35% of the total force at failure, depending on the reinforcement ratio. The performance of both the GFRP- and BFRP-RC columns was almost similar in terms of capacity, deflection, and bar strength contribution.

The Influence of Processing Parameters on the Mechanical Properties of Selectively Laser Melted Stainless Steel Microlattice Structures

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
S. Tsopanos ◽  
R. A. W. Mines ◽  
S. McKown ◽  
Y. Shen ◽  
W. J. Cantwell ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Cross Sections ◽  
Processing Parameters ◽  
Full Density ◽  
Laser Exposure ◽  
Compression Tests ◽  
Stainless Steel 316L ◽  
The Individual ◽  
Block Structures

The rapid manufacturing process of selective laser melting has been used to produce a series of stainless steel 316L microlattice structures. Laser power and laser exposure time are the two processing parameters used for manufacturing the lattice structures and, therefore, control the quality and mechanical properties of microlattice parts. An evaluation of the lattice material was undertaken by manufacturing a range of struts, representative of the individual trusses of the microlattices, as well as, microlattice block structures. Low laser powers were shown to result in significantly lower strand strengths due to the presence of inclusions of unmelted powder in the strut cross-sections. Higher laser powers resulted in struts that were near to full density as the measured strengths were comparable to the bulk 316L values. Uniaxial compression tests on microlattice blocks highlighted the effect of manufacturing parameters on the mechanical properties of these structures and a linear relationship was found between the plateau stress and elastic modulus relative to the measured relative density.

scholarly journals Investigation and Statistical Modeling of the Mechanical Properties of Additively Manufactured Lattices

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3962
Author(s):  
Derek G. Spear ◽  
Anthony N. Palazotto
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Design Parameters ◽  
Statistical Experimental Design ◽  
Lattice Structures ◽  
Compression Tests ◽  
Static Compression ◽  
Interaction Terms ◽  
Cell Densities ◽  
The Impact

This paper describes the background, test methodology, and experimental results associated with the testing and analysis of quasi-static compression testing of additively manufactured open-cell lattice structures. The study aims to examine the effect of lattice topology, cell size, cell density, and surface thickness on the mechanical properties of lattice structures. Three lattice designs were chosen, the Diamond, I-WP, and Primitive Triply Periodic Minimal Surfaces (TPMSs). Uniaxial compression tests were conducted for every combination of the three lattice designs, three cell sizes, three cell densities, and three surface thicknesses. In order to perform an efficient experiment and gain the most information possible, a four-factor statistical experimental design was planned and followed throughout testing. A full four-factor statistical model was produced, along with a reduced interactions model, separating the model by the significance of each factor and interaction terms. The impact of each factor was analyzed and interpreted from the resulting data, and then conclusions were made about the effects of the design parameters on the resultant mechanical performance.

scholarly journals Effect of addition of HTa to Al/PTFE under quasi-static compression on the properties of the developed energetic composite material

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8540-8545
Author(s):  
Xinxin Ren ◽  
Yuchun Li ◽  
Junyi Huang ◽  
Jiaxiang Wu ◽  
Shuangzhang Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Compression Tests ◽  
Static Compression ◽  
Reactive Materials ◽  
Reaction Characteristics ◽  
Quasi Static Compression

To study the mechanical properties and reaction characteristics of Al/HTa/PTFE reactive materials under quasi-static compression, five types of Al/HTa/PTFE specimens with different HTa contents were prepared for quasi-static compression tests.

Microstructure and Mechanical Properties Change with Cold Deformation of the Biomedical Ti-17Nb-6Ta-3Zr Alloy

2018 ◽  
Vol 780 ◽  
pp. 15-19 ◽  
Author(s):  
Kudakwashe Nyamuchiwa ◽  
Mohamed Abdel Hady Gepreel ◽  
Atef Hamada ◽  
Koichi Nakamura
Keyword(s):  
Mechanical Properties ◽  
Cold Deformation ◽  
Young Modulus ◽  
Xrd Analysis ◽  
Structure Characterization ◽  
Compression Tests ◽  
Static Compression ◽  
Bcc Structure ◽  
Cold Worked ◽  
The Stability

This study is to investigate the phase stability, cold deformation, elastic strain recovery and mechanical properties of a new Ti-17Nb-6Ta-3Zr, at. %, alloy for biomedical applications. The alloy was produced by arc melting. A heavy cold-working up to 90 % was applied to the alloy to investigate the stability of the predominant β-bcc structure. Characterization of the deformed structures was performed by X-ray diffraction (XRD), hardness measurements and optical microscopy. Quasi-static compression testing was conducted to determine the yield stress for stress induced martensitic (SIM) transformation and the Young modulus. XRD analysis of the cold-worked structures revealed that α-martensite was induced after less than 5 % deformation. An outstanding combination of strength-elasticity properties with the yield strength of 600 MPa and a Young modulus of 37 GPa was achieved during the compression tests.

The Effect of Magnetic Field on Magnetorheological Composites - Artificial Neural Network Based Modelling and Experiments

2015 ◽  
Vol 816 ◽  
pp. 327-336 ◽  
Author(s):  
Mateusz Kukla ◽  
Paweł Tarkowski ◽  
Jan Górecki ◽  
Ireneusz Malujda ◽  
Krzysztof Talaśka
Keyword(s):  
Neural Network ◽  
Magnetic Field ◽  
Mechanical Properties ◽  
Magnetic Flux ◽  
Design Parameters ◽  
Compression Tests ◽  
Static Compression ◽  
Magnetorheological Elastomers ◽  
Magnetic Strength ◽  
Set Up

Looking for new applications of the available materials, such as magnetorheological elastomers (MERs) is an important element of machine design process. To this end it is necessary to determine their fundamental mechanical properties, including Young’s modulus and shear modulus. These properties are determined experimentally by testing the material in compression, tension and shear. In the case of the analysed group of materials the above-mentioned constants depend, inter alia, on the parameters of magnetic field acting on them. Therefore, it is necessary to determine the character and the extent of variation of the mechanical properties as a function of the physical constants characterising the active magnetic field, namely magnetic flux and magnetic intensity (field strength).This paper presents the results of static compression tests carried out on magnetorheological elastomers. The parameters measured during the static compression test were force and displacement at a pre-set magnetic flux. The maximum strength of the induced magnetic field was limited by the design parameters of the test set-up. In order to determine the behaviour of the material at greater values of magnetic strength and flux the properties of a real material were modelled with a neural network. The simulation was carried out using a simple, one-layer neural network. The chosen network training approach was error backpropagation. This approach enables approximation and predicting of changes of the properties of the tested material. The output results will enable deriving an analytical model of the tested MREs.

scholarly journals Microstructures and Mechanical Properties of Two-Phase Alloys Based on NbCr2

1998 ◽  
Vol 552 ◽  
Author(s):  
Katherine C. Chen ◽  
Paul G. Kotula ◽  
Carl M. Cady ◽  
Michael E. Mauro ◽  
Dan J. Thoma
Keyword(s):  
Mechanical Properties ◽  
Hot Isostatic Pressing ◽  
Processing Technique ◽  
Compression Tests ◽  
Two Phase ◽  
Static Compression ◽  
Precursor Phase ◽  
Microstructures And Mechanical Properties ◽  
Novel Processing ◽  
Quasi Static Compression

ABSTRACTA two-phase, NbCrTi alloy (bce + C15 Laves phase) has been developed using several alloy design methodologies. In efforts to understand processing-microstructure-property relationships, different processing routes were employed. The resulting microstructures and mechanical properties are discussed and compared. Plasma arc melted (PAM) samples served to establish baseline, as-cast properties. In addition, a novel processing technique, involving decomposition of a supersaturated and metastable precursor phase during hot isostatic pressing (HIP), was used to produce a refined, equilibrium two-phase microstructure. Quasi-static compression tests as a function of temperature were performed on both alloy types. Different deformation mechanisms were encountered based upon temperature and microstructure.

Static Compression Tests of Concentrated Crystallized Carbon Dioxide

2015 ◽  
Vol 816 ◽  
pp. 490-495 ◽  
Author(s):  
Jan Górecki ◽  
Ireneusz Malujda ◽  
Krzysztof Talaśka ◽  
Mateusz Kukla ◽  
Paweł Tarkowski
Keyword(s):  
Mechanical Properties ◽  
Carbon Dioxide ◽  
Test Methods ◽  
Test Results ◽  
Compression Tests ◽  
Static Compression ◽  
Starting Point ◽  
Ratio Limit ◽  
Limit Stress ◽  
The Relationship

This paper presents the results of static compression tests of concentrated crystallized carbon dioxide. The test results obtained under this research describe the relationship between the compressive stress and strain allowing to estimate the proportionality ratio, limit stress and critical stress values. Special test methods were used due to low temperature of crystallized carbon dioxide (minus 78.5°C) and its sublimation under standard testing conditions. The results of the mechanical properties of agglomerated CO2 were compared with the mechanical properties of other known materials. This allowed us to derive assumptions, which can become the starting point of the process to build a mathematical model describing the dry ice compaction and granulation processes.

scholarly journals Compressive Properties of Functionally Graded Bionic Bamboo Lattice Structures Fabricated by FDM

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4410
Author(s):  
Zhou Wen ◽  
Ming Li
Keyword(s):  
Mechanical Properties ◽  
Energy Absorption ◽  
Honeycomb Structure ◽  
Absorption Capacity ◽  
Functionally Graded ◽  
Honeycomb Lattice ◽  
Lattice Structures ◽  
Compression Tests ◽  
Uniform Lattice ◽  
Static Compression

Bionic design is considered a promising approach to improve the performance of lattice structures. In this work, bamboo-inspired cubic and honeycomb lattice structures with graded strut diameters were designed and manufactured by 3D printing. Uniform lattice structures were also designed and fabricated for comparison. Quasi-static compression tests were conducted on lattice structures, and the effects of the unit cell and structure on the mechanical properties, energy absorption and deformation mode were investigated. Results indicated that the new bionic bamboo structure showed similar mechanical properties and energy absorption capacity to the honeycomb structure but performed better than the cubic structure. Compared with the uniform lattice structures, the functionally graded lattice structures showed better performance in terms of initial peak strength, compressive modulus and energy absorption.

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