Young-modulus determination of an orthotropic thin plate in the through-thickness direction

1999 ◽  
Vol 85 (12) ◽  
pp. 8490-8491 ◽  
Author(s):  
Sudook Kim ◽  
Hassel Ledbetter
Keyword(s):  
Thin Plate ◽  
Young Modulus ◽  
Thickness Direction ◽  
Orthotropic Thin Plate

Comparison of the viscoelastic penetration and tensile behaviour of poly(methyl acrylate) and poly(ethyl acrylate)

1979 ◽  
Vol 44 (6) ◽  
pp. 1942-1948 ◽  
Author(s):  
Jaroslav Hrouz ◽  
Michal Ilavský ◽  
Ivan Havlíček ◽  
Karel Dušek
Keyword(s):  
Methyl Acrylate ◽  
Poisson Ratio ◽  
Young Modulus ◽  
Ethyl Acrylate ◽  
Sample Volume ◽  
Viscoelastic Behaviour ◽  
Tensile Behaviour ◽  
Temperature Superposition ◽  
Main Transition

The viscoelastic penetration and tensile behaviour of poly(methyl acrylate) and poly(ethyl acrylate) in the main transition region have been investigated. It was found that the time-temperature superposition could be carried out in the case of the penetration viscoelastic behaviour; the temperature dependence of the penetration and tensile shift factors was the same. The superimposed curves of the penetration and Young modulus allowed us to calculate the dependence of the Poisson ratio and thus to characterize the change in sample volume with deformation. It was demonstrated that the penetration method of determination of the viscoelastic behaviour is equivalent to the tensile method.

scholarly journals State space approach with FEM for the determination of structural behaviour of composite plates

2017 ◽  
Vol 8 (4) ◽  
pp. 468-483
Author(s):  
Asad Shukri Albostami ◽  
Zhangjian Wu ◽  
Zhenmin Zou
Keyword(s):  
Plate Thickness ◽  
Composite Plates ◽  
Thickness Direction ◽  
Middle Plane ◽  
Structural Behaviour ◽  
State Space Approach ◽  
Content Type ◽  
Simply Supported ◽  
Space Approach

Purpose An analytical investigation has been carried out for a simply supported rectangular plate with two different loading conditions by using 3D state space approach (SSA). Also, the accurate location of the neutral plane (N.P.) through the thickness of the plate can be identified: the N.P. is shifted away from the middle plane according to the loading condition. The paper aims to discuss these issues. Design/methodology/approach SSA and finite element method are used for the determination of structural behaviour of simply supported orthotropic composite plates under different types of loading. The numerical results from a finite element model developed in ABAQUS. Findings The effect of the plate thickness on displacements and stresses is described quantitatively. It is found that the N.P. of the plate, identified according to the values of the in-plane stresses through the thickness direction, is shifted away from the middle plane. Further investigation shows that the position of the N.P. is loading dependant. Originality/value This paper describe the effect of the plate thickness on displacements and stresses quantitatively by using an exact solution called SSA. Also, it is found that the N.P. of the plate, identified according to the values of the in-plane stresses through the thickness direction, is shifted away from the middle plane. Further investigation shows that the position of the N.P. is loading dependant.

Influence of Transverse Anisotropy on the Plastic Collapse of Plates and Shells

1975 ◽  
Vol 97 (1) ◽  
pp. 125-130 ◽  
Author(s):  
J. Chakrabarty
Keyword(s):  
Yield Stress ◽  
Plane Stress ◽  
Carrying Capacity ◽  
Yield Criterion ◽  
Anisotropic Materials ◽  
Plastic Collapse ◽  
Thickness Direction ◽  
Transverse Anisotropy ◽  
Plates And Shells

A modification of Tresca’s yield criterion is discussed for plane stress in anisotropic materials, when the yield stress in the thickness direction is higher than in any direction perpendicular to it. Special consideration is given to the determination of collapse loads for symmetrically loaded plates and shells having this kind of anisotropy. It is found that the carrying capacity significantly increases with the degree of transverse anisotropy represented by a single parameter μ.

scholarly journals Flexural Vibration Test of a Beam Elastically Restrained at One End: A New Approach for Young’s Modulus Determination

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Rafael M. Digilov ◽  
Haim Abramovich
Keyword(s):  
Young Modulus ◽  
Flexural Vibration ◽  
Force Sensor ◽  
Frequency Equation ◽  
Bending Vibrations ◽  
Flexural Vibration Test ◽  
Elastically Restrained ◽  
Fixed End ◽  
Partially Restrained

A new vibration beam technique for the fast determination of the dynamic Young modulus is developed. The method is based on measuring the resonant frequency of flexural vibrations of a partially restrained rectangular beam. The strip-shaped specimen fixed at one end to a force sensor and free at the other forms the Euler Bernoulli cantilever beam with linear and torsion spring on the fixed end. The beam is subjected to free bending vibrations by simply releasing it from a flexural position and its dynamic response detected by the force sensor is processed by FFT analysis. Identified natural frequencies are initially used in the frequency equation to find the corresponding modal numbers and then to calculate the Young modulus. The validity of the procedure was tested on a number of industrial materials by comparing the measured modulus with known values from the literature and good agreement was found.

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