scholarly journals Estimating Young’s Modulus of Materials by a New Three-Point Bending Method

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Xiaohu Zeng ◽  
Shifeng Wen ◽  
Mingxi Li ◽  
Gongnan Xie
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Test Method ◽  
Bending Test ◽  
Contact Friction ◽  
Specimen Preparation ◽  
Test Accuracy ◽  
Theoretical Derivation ◽  
Three Point Bending ◽  
Aluminum Alloy 2024

A new test method based on the three-point bending test is put forward to measure Young’s modulus of materials. The simplified mechanical model is established to make theoretical derivation. This method has not only the advantages of simple specimen preparation and convenient loading device, but also higher precision than the traditional three-point bending method. The method is adopted to obtain Young’s modulus of the aluminum alloy 2024. The feasibility of the method has been demonstrated by comparisons with the corresponding results obtained from the finite element method and experiment method. And the influence of contact friction on the test accuracy is analyzed.

Elastic Strain Energy of a Nanowire in Three-Point Bending Test with the Consideration of Surface Effects

2011 ◽  
Vol 268-270 ◽  
pp. 67-71
Author(s):  
Xian Wei Zeng ◽  
Jia Quan Deng
Keyword(s):  
Young’S Modulus ◽  
Elastic Strain ◽  
Strain Energy ◽  
Young's Modulus ◽  
Elastic Strain Energy ◽  
Theoretical Models ◽  
Bending Test ◽  
Three Point Bending ◽  
Force Microscopy ◽  
Atomic Force

Three-point bending tests of nanowires with Contact atomic force microscopy reveal that the Young’s modulus of a nanowire is size-dependent. The modulus changes with the diameter of a nanowire. This size dependency can be explained within the framework of classical continuum mechanics by including the effects of surface stress. In this study, an analytical solution has been derived for the elastic strain energy of a nanowire with both ends clamped and contacted by an AFM tip at its midpoint. Different from previous theoretical models, the present model can handle the case of large deflection, where the displacement of the nanowire is in the same order of the diameter. Based on the equivalence of elastic strain energy, the apparent Young’s modulus of a nanowire is expressed as a function of the elastic modulus of the bulk and that of the surface, and the dimensions of a nanowire.

Dynamic Properties of Wood-Plastic Composites

2011 ◽  
Vol 101-102 ◽  
pp. 1078-1081
Author(s):  
Gui Wen Yu ◽  
Shuang Lan ◽  
Jian Yuan Feng ◽  
Zhuang Liu
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Dynamic Properties ◽  
Bending Test ◽  
Wood Plastic Composites ◽  
Three Point Bending ◽  
Dynamic Young’S Modulus ◽  
Bending Modulus ◽  
Plastic Composites ◽  
Dynamic Young's Modulus

Wood-plastic composites (WPC) , which were made of virgin high-density polyethylene (HDPE) with poplar fibers as filler, were measured by three vibration nondestructive testing (NDT) methods. The values of dynamic Young’s modulus of specimens were measured by different vibration NDT methods, and the values of static bending modulus of elasticity (MOE) were also determined by three point bending test according to ASTM D790-03. The paper analyzed the variability of the dynamic young’s modulus of WPC based on virgin HDPE obtained with different NDT methods, and the correlativity was also estimated between the dynamic Young’s modulus and the static MOE of WPC based on virgin HDPE. These results suggest that WPC can be made of virgin HDPE, and the NDT methods are appropriate to estimate the dynamic Young’s modulus of WPC based on virgin HDPE.

Nondestructive Testing of Wood-Plastics Structural Plates with Stiffener

2011 ◽  
Vol 314-316 ◽  
pp. 2087-2090
Author(s):  
Gui Wen Yu
Keyword(s):  
Nondestructive Testing ◽  
Young’S Modulus ◽  
High Density Polyethylene ◽  
Young's Modulus ◽  
Bending Test ◽  
Three Point Bending ◽  
Dynamic Young’S Modulus ◽  
Bending Modulus ◽  
Dynamic Young's Modulus ◽  
Set Up

In order to set up a new effective method for measuring mechanical properties of the wood-plastics structural plates with stiffener, three different nondestructive testing (NDT) methods were used on the specimens with stiffener, which were made of virgin high-density polyethylene (HDPE) with poplar fibers as filler. The values of dynamic Young’s modulus of the specimens were measured by a FFT system. And the values of static bending modulus of elasticity (MOE) were also determined by three point bending test according to ASTM D790-03. The paper analyzed the variability of the dynamic Young’s modulus of specimens with stiffener obtained with different NDT methods, and the correlativity was also estimated between the dynamic Young’s modulus and the static MOE of all specimens. The results suggested that the intensity of the wood-plastics structural plates could be enhanced by stiffener, and the NDT methods could be appropriate to estimate the dynamic Young’s modulus of the wood-plastics structural plates with stiffener.

A Novel Determination Method of IPMC Young’s Modulus Based on Cantilever Resonance Theory

2011 ◽  
Vol 66-68 ◽  
pp. 747-752 ◽  
Author(s):  
Li Na Hao ◽  
Jian Chao Gao ◽  
Hont Tao L.
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Displacement Transducer ◽  
Test Method ◽  
Bending Test ◽  
Determination Method ◽  
Resonance Theory ◽  
Ionic Polymer Metal Composites ◽  
Ionic Polymer ◽  
Polymer Metal

The research is aimed at presenting a novel determination method of IPMC (Ionic Polymer Metal Composites) Young’s Modulus. This method would fill up some deficiencies, such as damaging the tested IPMC strip, having low precision and so on, in the traditional method like tensile test and bending test. The paper presents a novel determination method based on cantilever resonance theory. Cantilever resonance theory is one of the methods to determinate the Young’s modulus of metal wire and metal strip. This method adopts Euler-Bernoulli beam to build a vibration differential equation of the beam. Then, by using the separate variable method, the general solution of the equation would be obtained. Considering the boundary conditions, a formula about the relation of the Young’s modulus and the first natural frequency is obtained. Limited by the experimental equipment and test method, this method has not been applied in the composite material. This paper attempts to apply this method in the IPMC material. The laser probing DISP (displacement) technique is applied in the test experiment. The laser displacement transducer is a kind of accurate un-contact laser displacement measurement set. The distance measured, which could be used to measure the change in position of the tested object, is based on the triangle principle.

scholarly journals Claw Characteristics of Culled Sows from Three Farrow-to-Finish Greek Farms. Part 2: Mechanical Indices of Hoof Horn and Their Associations with Length Measurements and Lesion Scores

2021 ◽  
Vol 8 (9) ◽  
pp. 175
Author(s):  
Sofia Chalvatzi ◽  
Georgios A. Papadopoulos ◽  
Fotios Kroustallas ◽  
Mihaela Cernat ◽  
Vassilis Skampardonis ◽  
...  
Keyword(s):  
Yield Stress ◽  
Young’S Modulus ◽  
Maximum Stress ◽  
Young's Modulus ◽  
Mechanical Efficiency ◽  
Bending Test ◽  
Lesion Score ◽  
Three Point Bending ◽  
Length Measurements ◽  
Lesion Severity

The objective of the present study was to investigate the mechanical indices of hoof horn and their association with length measurements and lesion score. The feet of 185 culled sows from three Greek farms (A: 57 sows; B: 64 sows; C: 64 sows) were used. A slice from the dorsal wall of each claw was used to assess by a three-point bending test the Young’s modulus, yield stress and aximum stress values. The available data from a companion study (part 1) on the length measurements and lesion scores of the claws were used to reveal possible relationships. The Young’s modulus values were significantly higher (p < 0.001 or p < 0.01 depending on location of claw) in the sows of farm C compared to those in sows of farms A and B and in sows of farm B compared to those in the sows of farm A. Yield and maximum stress values were significantly higher (p < 0.05 or p < 0.001 depending on the location of the claw) in the sows of farm C compared to those in the sows of farm A and in the sows of farm B compared to those in the sows of farm A. An increase in heel-sole length decreased all mechanical indices. Young’s modulus and yield stress were associated with wall lesion severity while maximum stress with wall and heel lesion severity. Overall, we conclude that mechanical efficiency deteriorates as length and lesion score increases.

scholarly journals Tensile strengths and Young’s modulus of thin copper and copper-nickel (CuNi44) substrates

2008 ◽  
Vol 6 (4) ◽  
pp. 535-541 ◽  
Author(s):  
Oliver Staller ◽  
Christina Mitterbauer ◽  
Katharina Mayr
Keyword(s):  
Yield Strength ◽  
Young’S Modulus ◽  
Pole Figure ◽  
Vickers Hardness ◽  
Young's Modulus ◽  
Coated Conductors ◽  
Test Method ◽  
Tensile Yield Strength ◽  
Reducing Atmosphere ◽  
Cold Worked

AbstractIn this paper we report a method to determine tensile strengths and Young’s modulus of cubic biaxial textured metal tapes used as substrate materials for coated conductors (CC). Simplicity, rapidity and reproducibility of the procedure are important for the evaluation of continuous in-house productions. Our approach is based on the EN 10002-1 B tensile test method. A key role for satisfactory results is the sample preparation of 100–250 μm thick tapes, which will be described in detail. Copper (E-Cu57) can be successfully transformed to cubic biaxial textured substrates. Best results were achieved by annealing between 750°C and 850°C in reducing atmosphere. Best FWHM values for the ψ scan are 5.51° and for the ϕ scan are 4.5°. Pole figure analysis verified the sharp {001} texture of the tape. Vickers hardness measurements (HV 0.1) for the cold worked material yielded values of 135 and for the annealed tape, values of 37. The ultimate tensile yield strength Rm of the textured substrate is 150 MPa and thus significantly lower than that for the cold worked material (413 MPa). Cubic biaxial substrates could be manufactured from Isotan CuNi44 (WM49) bars. Best results were achieved by annealing at 1200°C in reducing atmosphere. Pole figure analysis verified the {001} texture with other low intensity texture components. Vickers hardness measurements (HV 0.1) for the cold worked material yielded values of 236 and for the annealed tape values of 92. The ultimate tensile yield strength R m of the textured substrate is 300 MPa and thus significantly lower than that for the cold worked material (723 MPa).

Evaluation of Young’s modulus of RE123 bulk superconductors by three point bending tests

2006 ◽  
Vol 445-448 ◽  
pp. 422-426 ◽  
Author(s):  
T. Sato ◽  
K. Katagiri ◽  
T. Hokari ◽  
Y. Hatakeyama ◽  
A. Murakami ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Bending Tests ◽  
Three Point Bending ◽  
Bulk Superconductors
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