Performance of concrete beam reinforced with 3D printed Bioinspired primitive scaffold subjected to three-point bending

2022 ◽  
Vol 134 ◽  
pp. 104060
Author(s):  
Vuong Nguyen-Van ◽  
Niranjan Kumar Choudhry ◽  
Biranchi Panda ◽  
H. Nguyen-Xuan ◽  
Phuong Tran
Keyword(s):  
Concrete Beam ◽  
Three Point Bending ◽  
3D Printed

scholarly journals Knitted Meshes for Reinforcing Building Composites

2019 ◽  
Vol 27 (4(136)) ◽  
pp. 102-111
Author(s):  
Zbigniew Mikołajczyk ◽  
Katarzyna Pieklak ◽  
Aleksandra Roszak
Keyword(s):  
Concrete Beam ◽  
Bending Strength ◽  
Relative Elongation ◽  
Testing Machine ◽  
Strength Analysis ◽  
Knitted Fabrics ◽  
Three Point Bending ◽  
Concrete Mass ◽  
Frp Composites ◽  
Technical Textiles

Modern technical textiles, including knitted fabrics, are widely used in the construction industry. Regarding textiles in concrete reinforcement, methods based on shredded fibres, meshes, reinforcing mats, woven textiles and knitted DOStapes are frequently used as underlays of concrete constructions. Textiles are also used in the reinforcement of fibrous FRP composites. The research presented focused on producing composites made of MapeiMapefill concrete mass with reinforcement in the form of three variants of knitted meshes made of 228 tex polyamide threads, polypropylene threads of 6.3 tex and 203 tex glass threads, as well as identification of their mechanical properties. The mesh variant made of glass fibre is especially noteworthy, as its strength is more than three times higher than that of polyamide meshes. At the same time, a very small relative elongation of 3% is observed for this variant of knitted fabric, which is a desired property regarding the comparatively low stretching extension of concrete. In the process of making the composites, the adhesion of the concrete mass to the surface of the threads was analyzed. For this purpose, a "Sopro HE449" type agent was used. Composite beams were subjected to a three-point bending strength analysis on a testing machine. The results of strength measurements of the composites obtained prove that those with glass fibres demonstrate a threefold increase in strength compared to the original concrete beam.

Numerical Fracture Analysis of Foamed Concrete Beam Using XFEM Method

2016 ◽  
Vol 837 ◽  
pp. 183-186 ◽  
Author(s):  
Marcin Kozlowski ◽  
Marta Kadela ◽  
Monika Gwozdz-Lason
Keyword(s):  
Concrete Beam ◽  
Extended Finite Element Method ◽  
Fracture Behaviour ◽  
Numerical Models ◽  
Extended Finite Element ◽  
Three Point Bending ◽  
Damage And Fracture ◽  
Structural Applications ◽  
Foamed Concrete ◽  
Loading Tests

The paper presents results of numerical investigation of fracture behaviour of initially notched beams made of foamed concrete. Extended Finite Element Method (XFEM) was used to simulate the damage and fracture process of the beams subjected to three-point bending. Subsequently, the numerical models were validated by a series of static loading tests. Numerical models simulate correctly the fracture behaviour of beams observed during testing. XFEM method and computer simulation technologies allow for reliable approximation of load–bearing capacity and damage mechanisms of beams made of foamed concrete, which provides some foundations for realistic structural applications.

Simulation of Crack Propagation in Concrete Based on Extended Finite Element Method

2018 ◽  
Vol 783 ◽  
pp. 165-169 ◽  
Author(s):  
Yu Xiang Tang ◽  
Hong Niao Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Concrete Beam ◽  
Extended Finite Element Method ◽  
Peak Load ◽  
Experimental Tests ◽  
Extended Finite Element ◽  
Three Point Bending ◽  
Fracture Behaviors ◽  
Element Method

Fracture behaviors in concrete beam subjected to three-point bending was numerically simulated using extended finite element method (XFEM). The entire load-displacement curves and crack path obtained by numerical simulation were compared with that measured from experimental tests. Compared with the experimental results, the errors of numerical Pc and δc were smaller than 10% and the error of CMODc was lower than 2%, verifying the validity and accuracy of XFEM model. Whether a XFEM simulation or a test, the propagation direction of the main crack is toward to the upper loading point. At the peak load, the crack lengths measured by ESPI and XFEM were 93 μm and 97 μm respectively.

scholarly journals Strengthening and Strain Sensing of Rectangular Concrete Beam Using Composites and Fbg Sensors

1999 ◽  
Vol 8 (6) ◽  
pp. 096369359900800 ◽  
Author(s):  
Kin-tak Lau ◽  
Li-min Zhou ◽  
Li Ye
Keyword(s):  
Concrete Beam ◽  
Concrete Beams ◽  
High Strain ◽  
Concrete Surface ◽  
Surface Strain ◽  
Woven Composites ◽  
Strain Sensing ◽  
Three Point Bending ◽  
Bending Load ◽  
Fbg Sensors

In this paper, a state-of-art report of an experimental investigation on the mechanical properties of the laboratory size notched-concrete beams strengthened by using fibre woven composites is presented. Fibre-optic Bragg grating (FBG) sensors have been adhered on the concrete surface before laying up the composites to monitor the strain changes at the interface when the concrete beam was subjected to three-point bending load after strengthening. The electrical strain gauges were also used to measure the surface strain of the composites and compare the results from the internal sensors. The results show that the overall flexural strengths of the strengthened specimens are increased compared with its un-strengthened status. Concrete and bonding failures were observed when the thick reinforcement was used. In addition, the results obtained from the sensor reveal that the strain at the interface of bond was higher than that measured on the surface of the composite reinforcement. High strain was measured from the sensor when debond at the interface occurred.

scholarly journals Microseismic Signal Characterization and Numerical Simulation of Concrete Beam Subjected to Three-Point Bending Fracture

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Nuwen Xu ◽  
Feng Dai ◽  
Chun Sha ◽  
Yingcheng Lei ◽  
Biao Li
Keyword(s):  
Concrete Beam ◽  
Process Analysis ◽  
Failure Process ◽  
Microseismic Monitoring ◽  
Bending Test ◽  
Hydropower Station ◽  
Mass Concrete ◽  
Physical Test ◽  
Deformation And Failure ◽  
Three Point Bending

To study the generation mechanism and failure mode of cracks in mass concrete, microseismic monitoring is conducted on the fracture processes of the three-point bending roller compacted concrete (RCC) beam of Guanyinyan hydropower station. The spectrum characteristics of microseismic signals in different deformation and failure stages of the concrete beam are analyzed, and the identification method of the fracture stages and crack propagation precursors of concrete beam is established. Meanwhile, the Realistic Failure Process Analysis code (RFPA) is adopted to simulate and analyze the entire failure processes of concrete beam from its cracks initiation, development, propagation, and coalescence, until macroscopic fractures formation subjected to three-point bending test. The relation curve of the load, loaded displacement, and acoustic emission (AE) of concrete beam in the three-point bending test is also obtained. It is found that the failure characteristics of concrete beam obtained from numerical experiments agree well with the field physical test results. The heterogeneity of concrete is the major cause of zigzag propagation paths of beam cracks subjected to three-point bending tests. The results lay foundation for further exploring the formation mechanism of dam concrete cracks of Guanyinyan hydropower station.

Optimal Design for the Maximum Load of Three-Point Bending Concrete Beam Based on the Analyzing of Critical Crack-Mouth Opening Displacement

2012 ◽  
Vol 193-194 ◽  
pp. 954-957
Author(s):  
Xue Qin Wang ◽  
Lin Wang
Keyword(s):  
Optimal Design ◽  
Concrete Beam ◽  
Mouth Opening ◽  
Maximum Load ◽  
Least Square ◽  
Crack Mouth Opening Displacement ◽  
Engineering Practice ◽  
Unstable Fracture ◽  
Resistance Curve ◽  
Three Point Bending

An optimal design method for the maximum load of three-point bending concrete beam is proposed in this study. The statistics model is built according to the theory of GR resistance curve. With the help of least square method and Matlab® computing platform, the optimal design results are very similar of the experimental results, and thus a new criterion for unstable fracture in crack extension resistance curve theories is constructed. It can able to monitor safety and stability of specimens in engineering practice at any time.

Crack Propagation Analysis of Concrete Beam Subjected to Three-Point Bending Using XFEM

2011 ◽  
Vol 94-96 ◽  
pp. 1655-1658 ◽  
Author(s):  
Zhong Liang Ru ◽  
Hong Bo Zhao ◽  
Chuan Rui Zhu
Keyword(s):  
Crack Propagation ◽  
Concrete Beam ◽  
Extended Finite Element Method ◽  
Partition Of Unity ◽  
Partition Of Unity Method ◽  
Extended Finite Element ◽  
Three Point Bending ◽  
Crack Propagation Direction ◽  
Propagation Analysis ◽  
Model Crack

Extended finite element method (XFEM) has been applied to the crack propagation problems. A standard displacement-base approximation is enriched near a crack by incorporating both a discontinuous field and the near crack front asymptotic fields through a partition of unity method. This technique allows the entire crack to be represented independently of the mesh, so remeshing is not necessary to model crack growth. Applications of the proposed technique to beam subjected to three-point bending have been presented, results shown the location of the crack imposes important effect on the crack propagation direction.

scholarly journals Mechanical Properties of FDM Printed PLA Parts before and after Thermal Treatment

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1239
Author(s):  
Ali Chalgham ◽  
Andrea Ehrmann ◽  
Inge Wickenkamp
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Process Parameters ◽  
Fused Deposition Modeling ◽  
Poly Lactic Acid ◽  
Three Point Bending ◽  
Fused Deposition ◽  
Before And After ◽  
Deposition Modeling ◽  
3D Printed

Fused deposition modeling (FDM) is one of the most often-used technologies in additive manufacturing. Several materials are used with this technology, such as poly(lactic acid) (PLA), which is most commonly applied. The mechanical properties of 3D-printed parts depend on the process parameters. This is why, in this study, three-point bending tests were carried out to characterize the influence of build orientation, layer thickness, printing temperature and printing speed on the mechanical properties of PLA samples. Not only the process parameters may affect the mechanical properties, but heat after-treatment also has an influence on them. For this reason, additional samples were printed with optimal process parameters and characterized after pure heat treatment as well as after deformation at a temperature above the glass transition temperature, cooling with applied deformation, and subsequent recovery under heat treatment. These findings are planned to be used in a future study on finger orthoses that could either be printed according to shape or in a flat shape and afterwards heated and bent around the finger.

scholarly journals Material Consuption Reduction and the Influence on the Mechanical Properties of the 3D Printed Parts for ABS Silver

2021 ◽  
Vol 58 (3) ◽  
pp. 99-108
Author(s):  
Tibor Bedo ◽  
Mihai Alin Pop ◽  
Virgil Geaman ◽  
Irinel Radomir ◽  
Augustin Semenescu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Three Point Bending ◽  
3D Printed

The main objective was to reduce the consumption of material when obtaining 3D printed parts (different empty shapes inside) and the secondary one was to maintain the mechanical properties closer to the full printed version. In order to achieve these objectives, two internal configurations were designed - a configuration with hexagonal gaps (material reduction was 30%) and a configuration with sinuous gaps (material reduction was 15%). The specimens thus obtained were tested for traction, three-point bending and shock (resilience). Hexagonal hollow configuration has a resistance values close to those of solid specimens but with the advantage of consuming with 30% less material.

Sign in / Sign up

Export Citation Format

Share Document