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 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.

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.

Comparison of a standardized four-point bending test to an implant system test of an osteosynthetic system under static and dynamic load condition

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Christian Halbauer ◽  
Hendrik Schorler ◽  
Laura Liberto ◽  
Felix Capanni
Keyword(s):  
Load Condition ◽  
Bending Moment ◽  
Secondary Phase ◽  
Mechanical Analysis ◽  
Test Method ◽  
Bone Plate ◽  
Bending Test ◽  
Four Point Bending ◽  
Four Point Bending Test ◽  
Implant System

Abstract Current test standards of osteosynthetic implants examine the bone plate and screw separately leading to unrealistic load scenarios and unknown performance of the system as a whole, which prevents the identification of characteristic failures in clinical use. A standardized static and dynamic four-point bending test (ASTM F382) was performed on a bone plate. Based on that standard, an advanced implant system test (IST) was designed and performed to test a mechanical construct consisting of a bone plate, screws and an artificial bone substitute out of Polyoxymethylene (POM). The test object was an osteosynthetic system to treat fractured ulna bones. Both results of the conventional and advanced test method were analyzed and compared to one another. The static results show a similar yield point (YP) relative to the bending moment with just 9% difference. Dynamic results show a bi-phasic behavior of the displacement vs. cycle data for the IST. The secondary phase can be defined as a constantly increasing plastic deflection or ratcheting effect quantified by its slope in mm per one million cycles, leading to a 10 times higher slope for the IST than the conventional test. The IST has a high impact on the test results and the resultant interpretation of the mechanical behavior of the osteosynthetic system. A constantly increasing plastic deflection might lead to fatigue failures and to a loss of the mechanical durability. The development of new standardizations referring to the whole system within reasonable boundary conditions of individual biomechanical applications is crucial for high quality mechanical analysis.

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