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.

scholarly journals Geometry Effects in Four-Point Bending Test for Thin Sheet Studied by Finite Element Simulation

2016 ◽  
Vol 57 (3) ◽  
pp. 335-343 ◽  
Author(s):  
Xiaolong Dong ◽  
Hongwei Zhao ◽  
Lin Zhang ◽  
Hongbing Cheng ◽  
Jing Gao
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Thin Sheet ◽  
Bending Test ◽  
Four Point Bending ◽  
Element Simulation ◽  
Four Point Bending Test ◽  
Geometry Effects

Finite Element Method Simulating the Pipeline Mechanical Response During Reel-Lay Installation

2013 ◽  
Author(s):  
Ali A. Dawood ◽  
S. Kenny
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Continuum Model ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bending Test ◽  
Four Point Bending ◽  
Physical Tests ◽  
Test Frame ◽  
Four Point Bending Test

Finite element modelling procedures to simulate the pipeline mechanical response during reel lay installation are calibrated from the available literature. A three-dimensional continuum model was developed to simulate the bending and straightening processes during reel lay installation and was compared with physical tests conducted within a bending rig and four-point bending test frame. A range of pipeline diameters, wall thicknesses, material grades and weld offsets are examined.

An Analysis of the Local Buckling Collapse Behavior of an Aluminum Square Tube under Concentrated Bending Moment Loads

2004 ◽  
Vol 261-263 ◽  
pp. 633-638 ◽  
Author(s):  
Sung Hyuk Lee ◽  
Nak Sam Choi
Keyword(s):  
Finite Element ◽  
Local Buckling ◽  
Bending Moment ◽  
Bending Test ◽  
Aluminum Tube ◽  
Four Point Bending ◽  
Element Simulation ◽  
Steel Bars ◽  
Four Point Bending Test ◽  
Collapse Behavior

To analyze the bending collapse behavior of an aluminum square tube under the bending moment load, a finite element simulation for the four-point bending test has been performed. Using an aluminum tube beam specimen partly inserted with two steel bars, local buckling deformation near the center of the tube beam was induced. Simulated moment-rotation angle curve obtained during the post-collapse period of the aluminum tube with steel bars were in good agreement with experimental result, which was comparable to the result obtained from Kecman's theory. Using a combination of the four-point bending test and its finite-element simulation, analysis of the local buckling and the bending collapse behavior of an aluminum tube beam could be quantitatively accomplished.

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.

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