scholarly journals A New Measuring Method of Young's Modulus for Flexible Materials using Three Point Bending Test

2002 ◽  
Vol 2002.51 (0) ◽  
pp. 283-284
Author(s):  
Atsumi OHTSUKI ◽  
Hitoshi TAKADA
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Measuring Method ◽  
Bending Test ◽  
Three Point Bending ◽  
Flexible Materials

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.

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.

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.

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.

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