Determining elastic modulus of the material by measuring the deflection of the beam loaded in bending

Miljojković, Jasmina; Bijelić, Ivan; Vranić, Nenad; Radovanović, Nikola; Živković, Milutin

doi:10.17559/tv-20170609133537

Cited by 5 publications

(5 citation statements)

References 10 publications

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“…The indentation diameter was measured on a Meiji Techno M-50T optical microscope (Figure 4). The elastic modulus was measured on a specially developed measuring device (Figure 5) [39]. The elastic modulus was determined by measuring the test sample deflection f under the action of force F at a distance L/2 from each support.…”

Section: Methodsmentioning

confidence: 99%

“…Static methods are usually based on bending [21][22][23][24][25][26][27] or tensile testing [28], while dynamic methods include the resonance flexure method [29][30][31], ultrasonic methods [32][33][34][35], or the resonant (vibration) method [36]. Bending is often a preferred static method used to measure the elastic modulus [37,38], and it can be performed on a simple device with an accuracy of 2.6%, according to Miljojkovic et al [39].…”

Section: Introductionmentioning

confidence: 99%

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Investigation into the Effects of Roller Pressing on Hardness, Roughness and Elastic Modulus of Wooden Workpieces

et al. 2022

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The paper investigates the effects of roller pressing on the hardness, roughness, and elastic modulus of wooden workpieces. For research purposes, a roller pressing device based on purely mechanical processing was designed and developed. Four different levels of pressing force have been applied to eight different types of wood: cherry, fir, alder, linden, beech, walnut, oak, and ash. The obtained results indicate that the proposed processing method can significantly improve the hardness, elastic modulus, and surface quality of wooden workpieces. The ash sample exhibited the largest relative increase in hardness (175.9%), while the most significant relative increase in the elastic modulus (66.73%) was measured on the linden sample. The largest relative decrease in surface roughness (54.75%) was achieved on the alder sample. For all types of wood except for fir, in which case an increase in pressing force did not produce the desired reduction of roughness, correlation coefficients indicate a strong relationship between the pressing force as an input variable and the elastic modulus, hardness, and roughness as output variables.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation into the Effects of Roller Pressing on Hardness, Roughness and Elastic Modulus of Wooden Workpieces

et al. 2022

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“…The most known methods are mechanical (static and dynamic), acoustic, ultrasonic, resonant, optic, etc. [3][4][5][6]. Mechanical methods are the most compatible for determining the elastic modulus of thin materials such as rods, wires, and fibers [3].…”

Section: Introductionmentioning

confidence: 99%

“…[3][4][5][6]. Mechanical methods are the most compatible for determining the elastic modulus of thin materials such as rods, wires, and fibers [3]. "The mechanically measured Young's modulus of metals is consistently lower than the physically measured one, particularly after plastic straining.…”

Section: Introductionmentioning

confidence: 99%

Proposing a Design Model for Determining Flexural Bearing Capacity of RC Beams Reinforced by Steel with Reduced Modulus of Elasticity

Dzidic,

Mahmutovic

2023

Civil Engineering

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The design of concrete structures and elements in Europe and wider is conducted according to EN 1992-1-1. Among other design assumptions, the Eurocode 2 assumes the design value of the modulus of elasticity Es of reinforcing steel to be 200 GPa. However, what happens in the RC beam if the actual modulus of elasticity is significantly reduced. Does it affect the flexural bearing capacity of RC beam and to what extent? Another logical question is how to determine the actual flexural bearing capacity of the RC beam reinforced with reinforcing steel with a reduced modulus of elasticity and which design model to use for such determination. This study tries to answer such questions using an experimental approach and assumed calculation model with a comparison of experimental and calculation results. The experimental research from this showed that test RC beams reinforced by steel with reduced modulus of elasticity have significantly reduced flexural capacity in comparison with the designed flexural capacity of beams reinforced by steel with “normal” modulus of elasticity. In this regard, it is recommended to test the mechanical properties of the steel reinforcement prior to the installation at the site and not to rely on the producer’s factory production control certificate only. Additional issues considered in this research are observed effects of the reduced modulus of elasticity of reinforcing bars to Serviceability Limit States (stress limitation, crack width, and deflection control). Answers to such questions can inform decisions if retrofit is needed, is it feasible and if yes—which retrofit method to be used. This study does not discuss the reasons for the reduced modulus of elasticity in reinforcing steel.

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“…Students and teachers test, validate, refine, and upgrade those sets over time, developing them from educational tools to equipment that is successfully implemented in laboratory exercises and scientific research. The examples are: a vibroplatform model [7], a device for determining elastic modulus by bending [8], a high-stiffness tool for ball burnishing [9], a novel modular fixture for a flexible manufacturing system [10], small laboratory tensile testing device [11], tribometer for experimental determination of the kinetic friction coefficient [12].Work on designing the educational and research devices generated the idea of developing didactic sets based on a modular principle.…”

Section: Introductionmentioning

confidence: 99%

Development of a Modular Didactic Laboratory Set for the Experimental Study of Friction

et al. 2022

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The paper presents the results related to the development of a modular didactic laboratory set for the experimental study of friction and its implementation in engineering education. Successfully implemented in laboratory exercises and research, the modular set has been upgraded over time. A newly developed module is presented for investigating the kinetic coefficient of friction based on the differential equation of motion on an inclined plane. The authors deal with the most critical case -a free fall of a shell-shaped pin down the cylindrical guide when, theoretically, the friction force is equal to zero, while the air resistance force has a maximum value. Based on the time data recorded by inductive sensors, measurements were performed to determine the discrepancy between the theoretical and experimental acceleration values. After introducing the calculation model, the authors quantify very small energy "losses" and analyse the relationship between the unknown resistance force, caused primarily by the imperfections of the experiment, and the air resistance force.

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Determining elastic modulus of the material by measuring the deflection of the beam loaded in bending

Cited by 5 publications

References 10 publications

Investigation into the Effects of Roller Pressing on Hardness, Roughness and Elastic Modulus of Wooden Workpieces

Investigation into the Effects of Roller Pressing on Hardness, Roughness and Elastic Modulus of Wooden Workpieces

Proposing a Design Model for Determining Flexural Bearing Capacity of RC Beams Reinforced by Steel with Reduced Modulus of Elasticity

Development of a Modular Didactic Laboratory Set for the Experimental Study of Friction

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