scholarly journals Measurment of bending properties of rhizophora tropical wood

2017 ◽  
Vol 26 (2) ◽  
pp. 73-84
Author(s):  
Sinin Hamdan ◽  
Mahbub Hasan ◽  
Yoann Nohe
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Bending Test ◽  
Proportional Limit ◽  
Bending Properties ◽  
Bending Tests ◽  
Four Point Bending ◽  
Limit Stress ◽  
Four Point Bending Test ◽  
Proportional Limit Stress

The Young’s modulus, load at the yield point and proportional limit stress from the compression bending (cb) test were compared with the four point bending tests (4pb). The theoretical Young’s modulus are larger than the real reading for 5mm and 10mm thick specimens, except for 200mm long specimens due to specimen nonlinearity. The experimental results for the short specimens are slightly high compared to the theory due to uniaxial compression in both tensile and compressive planes. Since the additional deflection produced by the shearing force and the stress concentration at the loading point was smaller with the compression bending test compared to the conventional four point bending test the values of Ecb are larger than E4pb. It is noted that when length/thickness (l/t)>80, the values of Ecb are scattered. In addition, Ecb decrease sharply when l/t<30. In order to obtain a stable Young’s modulus value, it is suggested that the l/t should be 30~80.

scholarly journals MEASURMENT OF BENDING PROPERTIES OF RHIZOPHORA TROPICAL WOOD

2017 ◽  
Vol 27 (2) ◽  
pp. 73-84
Author(s):  
Sinin Hamdan ◽  
Mahbub Hasan ◽  
Yoann Nohe
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Bending Test ◽  
Proportional Limit ◽  
Bending Properties ◽  
Bending Tests ◽  
Four Point Bending ◽  
Limit Stress ◽  
Four Point Bending Test ◽  
Proportional Limit Stress

The Young’s modulus, load at the yield point and proportional limit stress from the compression bending (cb) test were compared with the four point bending tests (4pb). The theoretical Young’s modulus are larger than the real reading for 5mm and 10mm thick specimens, except for 200mm long specimens due to specimen nonlinearity. The experimental results for the short specimens are slightly high compared to the theory due to uniaxial compression in both tensile and compressive planes. Since the additional deflection produced by the shearing force and the stress concentration at the loading point was smaller with the compression bending test compared to the conventional four point bending test the values of Ecb are larger than E4pb. It is noted that when length/thickness (l/t)>80, the values of Ecb are scattered. In addition, Ecb decrease sharply when l/t<30. In order to obtain a stable Young’s modulus value, it is suggested that the l/t should be 30~80.

scholarly journals Influence of substrate twisting on Young's modulus measured by four-point bending test for thermal barrier coatings

2017 ◽  
Vol 4 (5) ◽  
pp. 16-00714-16-00714
Author(s):  
Masahiko KATO ◽  
Yuuki MATSUO ◽  
Hiroyuki WAKI ◽  
Satoru TAKAHASHI ◽  
Hiroyuki AKEBONO ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Thermal Barrier Coatings ◽  
Young's Modulus ◽  
Bending Test ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Four Point Bending ◽  
Four Point Bending Test ◽  
Influence Of Substrate

Comparison of results obtained by static 3- and 4-point bending and flexural vibration tests on solid wood, MDF, and 5-plywood

Holzforschung ◽  
2013 ◽  
Vol 67 (8) ◽  
pp. 941-948 ◽  
Author(s):  
Hiroshi Yoshihara
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Medium Density Fiberboard ◽  
Flexural Vibration ◽  
Solid Wood ◽  
Bending Tests ◽  
Four Point Bending ◽  
Flexural Vibration Test ◽  
The Difference ◽  
Vibration Tests

Abstract The flexural Young’s modulus of western hemlock, medium-density fiberboard, and 5-plywood (made of lauan) has been determined by conducting three- and four-point bending tests with various span lengths and by flexural vibration test. The Young’s modulus was significantly influenced by the deflection measurement method. In particular, the Young’s modulus was not reliable based on the difference between the deflections at two specific points in the specimen, although this test is standardized according to ISO 3349-1975 and JIS Z2101-2009.

Research on Damage and Bending Properties of AZ31 Magnesium Alloy

2012 ◽  
Vol 184-185 ◽  
pp. 1163-1166
Author(s):  
Xi An Xie ◽  
Gao Feng Quan
Keyword(s):  
Magnesium Alloy ◽  
Applied Load ◽  
Bending Strength ◽  
Az31 Magnesium Alloy ◽  
Bending Test ◽  
Bending Properties ◽  
Four Point Bending ◽  
Heat Treated ◽  
Four Point Bending Test ◽  
Initial Cracks

Through the four-point bending test of lath-shaped heat treated AZ31 magnesium alloy, the bending properties and damage characteristics were explored. The results show that the optimal bending strength of the magnesium alloy were 355.1MPa and 259.2MPa for extruded and cast samples, respectively, after corresponding heat treatment with 350°C, 90min and 400°C, 30min. The initial cracks both occurred at the loading point after applied load exceeded the yield limit of AZ31 magnesium alloy. Surface bump, cracks and other damage morphology accompanied by a large number of twinning organizations were found on the surface of the samples.

scholarly journals Four-Point Bending Tests to Study the So-Called Plasticity Effect on the Residual Stress Results Determined by the Hole-Drilling and Ring-Core Methods

2014 ◽  
Vol 996 ◽  
pp. 319-324
Author(s):  
David von Mirbach
Keyword(s):  
Residual Stress ◽  
Bending Test ◽  
Hole Drilling ◽  
Test Machine ◽  
Bending Tests ◽  
Hole Drilling Method ◽  
Four Point Bending ◽  
Drilling Method ◽  
Four Point Bending Test ◽  
Ring Core

The hole-drilling method (HDM) and ring core method (RCM) are limited to low residual stresses under 60% of the yield stress. This issue will experimentally analyze the method of adaptive calculation function, presented by the author on the ICRS9. With a four-point-bending test machine, a defined stress can be triggered between the middle bending. In this defined loading area, the strains in two load cases with the HDM and the RCM configuration were measured. With these measured strains the residual stress calculation will be analysed.

Analysis of iron aluminide coated beams under creep conditions in high-temperature four-point bending tests

2018 ◽  
Vol 53 (4) ◽  
pp. 255-265 ◽  
Author(s):  
Joachim Nordmann ◽  
Philipp Thiem ◽  
Nuria Cinca ◽  
Konstantin Naumenko ◽  
Manja Krüger
Keyword(s):  
High Temperature ◽  
Creep Behaviour ◽  
Substrate Material ◽  
Iron Aluminide ◽  
Bending Test ◽  
Bending Tests ◽  
Four Point Bending ◽  
Wear And Corrosion ◽  
Four Point Bending Test ◽  
Wear And Corrosion Resistance

Recent research is focused on the possibility to coat a metallic alloy with intermetallics or ceramics to improve wear and corrosion resistance, as well as creep behaviour at high temperatures, next to other properties of the alloy. Nowadays, this gains importance due to stricter environment guidelines. Here, we present a model to describe a non-symmetric compound in a high-temperature four-point bending test, performed at [Formula: see text]. The substrate material is an aluminium alloy AlSi10MgT6, and the coating material is the iron aluminide Fe24Al0.6Nb. Up next, a layer-wise theory is introduced to calculate the forces between substrate and coating. Furthermore, required material parameters are identified, and a new procedure to determine Young’s modulus of a coating is presented. Finally, simulation results are compared to experimental data, illustrating that the presented model is able to describe the material behaviour accurately.

Shear properties of wood measured by the asymmetric four-point bending test of notched specimen

Holzforschung ◽  
2009 ◽  
Vol 63 (2) ◽  
Author(s):  
Hiroshi Yoshihara
Keyword(s):  
Finite Element ◽  
Pure Shear ◽  
Solid Wood ◽  
Tsuga Heterophylla ◽  
Bending Test ◽  
Shear Properties ◽  
Notched Specimen ◽  
Four Point Bending ◽  
Four Point Bending Test ◽  
Proportional Limit Stress

Abstract The asymmetric four-point bending test for obtaining shear properties of wood was examined. Rectangular bars with various notches on top and bottom surfaces of western hemlock (Tsuga heterophylla Sarg.) were prepared as a specimen. The shear modulus, proportional limit stress, and shear strength were measured. The influence of notch configuration on the shear properties was examined independently by finite element calculations. The influence of notch configuration was not significant in experiments, while it was found relevant in finite element analyses. Although the pure shear stress condition could not be realized after the initiation of failure, the measurement of shear properties of solid wood simply by the asymmetric four-point bending test was feasible.

Coupled Nanoscratch and 4-Point Bending Evaluations of Adhesion in SiCN/Cu/Ta/TaN/SiO2/Si Stacked Layers

2008 ◽  
Vol 1086 ◽  
Author(s):  
Kouji Yoneda ◽  
Satoshi Shimizu ◽  
Nobuo Kojima ◽  
Chikai Sato ◽  
Jiping Ye
Keyword(s):  
Thin Film ◽  
Plastic Deformation ◽  
Small Area ◽  
Bending Test ◽  
Adhesion Properties ◽  
Bending Tests ◽  
Four Point Bending ◽  
Quantitative Measurements ◽  
Similarities And Differences ◽  
Four Point Bending Test

AbstractNanoscratch test used for small area measurements and four-point bending test applied for quantitative measurements were coupled to evaluate the adhesive strengths of SiCN/Cu/Ta,/TaN/SiO2/Si stacked layers. The similarities and differences of the two methods concerning adhesion, position of the delamination interface, and plastic deformation of the delaminated film were estimated. It was found that the nanoscratch test gave similar adhesion properties when the delamination interface was the same as that formed by the four-point bending test. The four-point bending test displayed clearer results compared to the nanoscratch test because energy for delamination was not used in plastic deformation and the crack could propagate further. These results suggest that coupling the nanoscratch and four-point bending tests is powerful way to estimate and understand adhesion of thin film materials.

Cement Composite Reinforced with Synthetic Fibers: Comparison of Three-Point and Four-Point Bending Test Results

2016 ◽  
Vol 827 ◽  
pp. 332-335 ◽  
Author(s):  
Jaroslav Topič ◽  
Jan Bartoš ◽  
Lubomír Kopecký ◽  
Karel Šeps ◽  
Zdeněk Prošek ◽  
...  
Keyword(s):  
Bending Strength ◽  
Cement Composite ◽  
Bending Test ◽  
Test Results ◽  
Recycled Pet ◽  
Bending Tests ◽  
Synthetic Fibers ◽  
Four Point Bending ◽  
Pet Fibers ◽  
Four Point Bending Test

Presented article deals with the influence of PET fiber production on the bending strength of cement-based composite when incorporated into the fresh mortar, and comparison of results of 3-point and 4-point bending test. Cement paste samples were reinforced with 2 wt. % of primary or recycled PET fibers. The bending test was performed on prismatic samples with dimension of 40 × 40 × 160 mm. It was found that samples with recycled PET fibers, compared to primary ones, exhibit a decrease in bending strength. In the case of 4-point bending tests, the samples with recycled PET fibers exhibited higher bending strength than reference samples without any fibers. However, in the case of 3-point bending tests, the samples with recycled PET fibers had lower bending strength than the reference ones. The results suggest that recycled PET fibers could be used as an alternative to reinforce cement-based composites.

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