Stress Analysis of Photo-Elastic Orthotropic Composite Material and Measurement Fringe Value of Shear Material

2013 ◽  
Vol 330 ◽  
pp. 12-17
Author(s):  
Yun Jiang ◽  
Hua Dong Zhang ◽  
De Ben Hu ◽  
Xiao Chun Fan
Keyword(s):  
Composite Material ◽  
Cross Section ◽  
Orthotropic Material ◽  
Rectangular Cross Section ◽  
Pure Shear ◽  
Orthotropic Composite ◽  
Orthotropic Composite Material ◽  
Elastic Composite ◽  
Tensile Experiment ◽  
Elastic Shear

Based on the analysis characteristics of orthotropic composite material under antisymmetric force, a new measurement method is established which can independently measure the fringe value of optical shear orthotropic material by pure-shear experiment. Two orthotropic photo-elastic composite material beams with rectangular cross-section which fiber orientation is 0 °, 90 ° respectively are loaded anti-symmetric force, so that the anti-symmetric section is in a pure shear stress state. The fringe value of orthotropic photo-elastic shear composite material is measured . The results agree with three stripe specimens tensile experiment.

Displacement potential solution of a deep stiffened cantilever beam of orthotropic composite material

2007 ◽  
Vol 42 (7) ◽  
pp. 529-540 ◽  
Author(s):  
S. K Deb Nath ◽  
A M Afsar ◽  
S Reaz Ahmed
Keyword(s):  
Composite Material ◽  
Cantilever Beam ◽  
Numerical Solutions ◽  
Elastic Field ◽  
Shear Loading ◽  
Order Partial Differential Equation ◽  
Orthotropic Composite ◽  
Displacement Potential ◽  
Orthotropic Composite Material ◽  
Present Solution

An analytical solution of the elastic field of a deep stiffened cantilever beam of orthotropic composite material is presented in the paper. The cantilever beam is subjected to a parabolic shear loading at its free lateral end and the two opposing longitudinal edges are stiffened. Unidirectional fibre-reinforced composite is considered for the present analysis where the fibres are assumed to be directed along the beam length. Following a new development, the present mixed-boundary-value elastic problem is formulated in terms of a single potential function defined in terms of the associated displacement components. This formulation reduces the problem to the solution of a single fourth-order partial differential equation of equilibrium and is capable of dealing with mixed modes of boundary conditions appropriately. The solution is obtained in the form of an infinite series. Results of different stress and displacement components at different sections of the composite beam are presented numerically in the form of graphs. Finally, in an attempt to check the reliability as well as the accuracy of the present solution, the problem is solved by using two standard numerical methods of solution. A comparison of the results shows that the analytical and numerical solutions of the present problem are in good agreement and thus establishes the soundness as well as the reliability of the present displacement potential approach to solution of the elastic field of orthotropic composite structures.

scholarly journals The distribution of slide in a right six-face subject to pure shear

1911 ◽  
Vol 85 (580) ◽  
pp. 448-461 ◽  
Keyword(s):  
Cross Section ◽  
De Novo ◽  
Rectangular Cross Section ◽  
Water Pressure ◽  
Pure Shear ◽  
Engineering Practice ◽  
Mathematical Treatment ◽  
Horizontal Section ◽  
Rigid Plane ◽  
Forced Distribution

The question of the exact distribution of slide in the cross-section of a body subjected to transverse force has recently attracted considerable attention in connection with the much-discussed problem of the stability of dams. the experiments to be described were undertaken with a view to ascertaining this distribution in the simple case of a right six-face, one face of which is everywhere fastened to a fixed rigid plane, while the opposite face, also fastened to a rigid plane, is slid parallel to itself, all the other faces being free. The slide was measured over a free face parallel to the direction of traction by an optical method described in the experimental section. Engineering practice assumes the distribution to be parabolic, but this is generally discredited. The experimental work of Pearson and Pollard indicated that when the shear was due to water pressure only, the distribution over a horizontal section had two maxima, and a minimum rather than a maximum at the centre. The experiments of Wilson and Gore indicated a double maximum with certain forced distribution of shear over the base, but not with others. Hence it appeared desirable to test the matter de novo with a simpler load than occurs in a model dam, and a simpler contour; the rectangular contour was adopted as being of considerable theoretical interest, and possibly amenable to detailed mathematical treatment. The result has been to obtain experimentally curves which leave no doubt as to the real existence of a double maximum distribution of slide; the double maximum is very marked over the central section, but, as would be expected, less strongly marked over the sections nearer to the faces constrained to remain plane. The curves resemble somewhat those obtained theoretically by Filon for a different system of loading, viz., a bar of rectangular cross section, pressed on two parallel sides by two knife-edges not opposite to one another, and equilibrated by two shears over the free ends, which are at distances such that the principle of equipollent loading applies.

Failure analysis of orthotropic composite material under thermo-elastic loading by XFEA

2020 ◽  
Vol 26 ◽  
pp. 2163-2167
Author(s):  
Pankaj Kumar ◽  
Himanshu Pathak ◽  
Akhilendra Singh ◽  
Indra Vir Singh
Keyword(s):  
Composite Material ◽  
Failure Analysis ◽  
Orthotropic Composite ◽  
Orthotropic Composite Material ◽  
Elastic Loading
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