scholarly journals Determining Tensile Strength of Rock by the Direct Tensile, Brazilian Splitting, and Three-Point Bending Methods: A Comparative Study

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Zhengjun Huang ◽  
Ying Zhang ◽  
Yuan Li ◽  
Dong Zhang ◽  
Tong Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Tensile Strength ◽  
Damage Evolution ◽  
Failure Modes ◽  
Bending Test ◽  
Evolution Process ◽  
Internal Crack ◽  
Three Point Bending ◽  
Direct Tensile ◽  
Brazilian Splitting

To accurately obtain the tensile strength of rock and fully understand the evolution process of rock failure is one of the key issues to the research of rock mechanics theories and rock mass engineering applications. Using direct tensile, Brazilian splitting, and three-point bending test methods, we performed indoor and numerical simulation experiments on marble, granite, and diabase and investigated the tensile strength and damage evolution process of several typical rocks in the three different tests. Our experiments demonstrate that (1) the strength is about 10% greater in the Brazilian splitting than in the direct tensile, while the tensile modulus is lower; it is the highest in the three-point bending, which is actually subjected to the bending moment and suggested as one of the indexes to evaluate the tensile strength of rock; (2) the strength in splitting tests is strikingly different, while the strain law is basically similar; the direct tensile test with precut slits is more attainable than that with no-cut slits, with an uninfluenced strength; (3) the failure modes of rocks using different methods are featured by different lithology, while their final modes are basically the same under the same method; (4) PFC and RFPA numerical simulation tests are effective to analyze the internal crack multiplication and acoustic emission changes in the rock as well as the damage evolution process of rock in different tests.

scholarly journals Experimental and Numerical simulation of a Three Point Bending Test of a Stainless Steel Beam

2021 ◽  
Vol 55 ◽  
pp. 1114-1121
Author(s):  
Daniel Jindra ◽  
Zdeněk Kala ◽  
Jiří Kala ◽  
Stanislav Seitl
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Bending Test ◽  
Steel Beam ◽  
Three Point Bending

An Experimental Study of Nonlinear Behavior of Graphite/Epoxy Laminate under a Three-Point Bending Test

2021 ◽  
Vol 900 ◽  
pp. 9-15
Author(s):  
Mouad Bellahkim ◽  
Youssef Benbouras ◽  
Aziz Maziri ◽  
El Hassan Mallil ◽  
Jamal Echaabi
Keyword(s):  
Experimental Study ◽  
Failure Modes ◽  
Nonlinear Behavior ◽  
Bending Test ◽  
Three Point Bending ◽  
Digital Microscope ◽  
Layer Orientation ◽  
Bending Behavior ◽  
The Relationship ◽  
Geometrical Dimensions

In this work, an attempt has been made to study the experimental of behavior for carbon/epoxy woven laminates under a three-point bending test by varying the support span and the geometrical dimensions of the specimens. Two principles stacking sequences are studied ([45 / 0]2s & [90 / 0]6 ) to observe the effect of the layer orientation in the failure modes. This study has allowed us to confirm the relationship between the bending behavior of the specimens and the span-to-thickness ratio (l/h). Finally, a digital microscope was selected in order to characterize the succession of the failure and the failure modes, mainly the delamination damage.

scholarly journals Results verification of numerical simulation of the side impact of a vehicle in a three-point bending test

2021 ◽  
Vol 1199 (1) ◽  
pp. 012055
Author(s):  
E Evin ◽  
S Nemeth
Keyword(s):  
Numerical Simulation ◽  
Material Model ◽  
Alloyed Steel ◽  
Side Impact ◽  
Bending Test ◽  
Two Phase ◽  
Three Point Bending ◽  
Deformation Work ◽  
Deformation Force ◽  
Micro Alloyed Steel

Abstract The research objective was to use numerical simulation to verify safety characteristics of deformation zone reinforcements subjected to bending, obtained from experimental results of the stretch-bending test. The methodology proposed for result verification by means of numerical simulation using a three-point bending test was verified on a sheet metal strip made of micro alloyed steel H 220 PD and a two-phase ferritic-martensitic steel DP 600. Material data for the material model according to Krupkovsky were determined in the tensile test. The measured data were processed tabularly and graphically. A comparison of the deformation work constant and the stiffness and deformation force constants shows that a very good match between the measured and the calculated characteristics has been achieved. Based on the data obtained, it can be assumed that it is possible to reduce the weight of deformation elements while maintaining the required safety characteristics by replacing micro alloyed steel H 220PD with the two-phase DP steel.

Numerical Simulation of Three-Point Bending Test for Asphalt Mixtures

2022 ◽  
Author(s):  
Hongyan Ma ◽  
Peiyuan Cheng ◽  
Mengxi Lv ◽  
Liangliang Chen ◽  
Canlin Zhang
Keyword(s):  
Numerical Simulation ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Three Point Bending

scholarly journals Study on Mechanical Features of Brazilian Splitting Fatigue Tests of Salt Rock

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Weichao Wang ◽  
Mengmeng Wang ◽  
Xiliang Liu
Keyword(s):  
Tensile Strength ◽  
Failure Modes ◽  
Splitting Method ◽  
Fatigue Tests ◽  
Test Machine ◽  
Salt Rock ◽  
Tablet Splitting ◽  
Splitting Test ◽  
Fracturing Process ◽  
Brazilian Splitting

The microtest, SEM, was carried out to study the fracture surface of salt rock after the Brazilian splitting test and splitting fatigue test were carried out with a servo-controlled test machine RMT-150B. The results indicate that the deviation of using the tablet splitting method is larger than that of using steel wire splitting method, in Brazilian splitting test of salt rock, when the conventional data processing method is adopted. There are similar deformation features in both the conventional splitting tests and uniaxial compression tests. The stress-strain curves include compaction, elasticity, yielding, and failure stage. Both the vertical deformation and horizontal deformation of splitting fatigue tests under constant average loading can be divided into three stages of “loosening-tightness-loosening.” The failure modes of splitting fatigue tests under the variational average loading are not controlled by the fracturing process curve of the conventional splitting tests. The deformation extent of fatigue tests under variational average loading is even greater than that of conventional splitting test. The tensile strength of salt rock has a relationship with crystallization conditions. Tensile strength of thick crystal salt rock is lower than the bonded strength of fine-grain crystals.

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 Calculation for tensile strength and fracture toughness of granite with three kinds of grain sizes using three-point-bending test

PLoS ONE ◽  
2018 ◽  
Vol 13 (3) ◽  
pp. e0180880 ◽  
Author(s):  
Miao Yu ◽  
Chenhui Wei ◽  
Leilei Niu ◽  
Shaohua Li ◽  
Yongjun Yu
Keyword(s):  
Fracture Toughness ◽  
Tensile Strength ◽  
Bending Test ◽  
Three Point Bending ◽  
Grain Sizes

Numerical Simulation on Ultimate Bearing Capacity of FRP Reinforced Concrete Notched Beams

2010 ◽  
Vol 452-453 ◽  
pp. 337-340
Author(s):  
Pei Xiu Xia ◽  
Guang Ping Zou ◽  
Jie Lu
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Fracture Mechanism ◽  
Failure Modes ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Three Point Bending ◽  
Extreme Load ◽  
Simulation Results

: In this research, some concrete three-point bending specimens (beams) reinforced by FRP are used in numerical simulation to study the influence of the reinforcement on fracture mechanism and the extreme load-bearing capacity of the specimens. The numerical simulation results show the propagation of the crack in concrete is controlled by using FRP. Meanwhile the load-bearing capacity is increased greatly and failure modes are changed.

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.

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