Fabrication of medical footwear for suitable distribution of stress and strain and reduction of plantar pressure by numerical and experimental approaches

2019 ◽  
Vol 233 (10) ◽  
pp. 1051-1063 ◽  
Author(s):  
Ehsan Shakouri ◽  
Alireza Mossayebi ◽  
Payam Saraeian
Keyword(s):  
Strain Distribution ◽  
Styrene Butadiene Rubber ◽  
Stress And Strain ◽  
Butadiene Rubber ◽  
Element Analysis ◽  
Kevlar Fiber ◽  
Plantar Region ◽  
Distribution Of Stress ◽  
Styrene Butadiene ◽  
Stress And Strain Distribution

Medical insoles and orthopedic shoes are responsible for reducing the force exerted by the ground to the plantar region of the feet. This combination is designed to develop a suitable distribution of stress and strain in the plantar region. In the present study, attempts have been made to design a prototype of medical footwear which can provide a proper stress and strain distribution in the plantar region while reducing pressure in comparison with current orthopedic footwear. For this purpose, the hyper-elastic behavior materials, including styrene-butadiene rubber, silicon, Plastazote foam, polyfoam, ethylene-vinyl acetate foam, polyurethane foam, and polyurethane, have been investigated, with different degree of hardness as well as one layer of composite with Kevlar fiber, whose effect is reducing the pressure exerted to the feet. A combination of materials was used to construct an insole sample, and uniaxial pressure tests were performed for testing its mechanical properties. Then, these properties were used in finite element analysis, whereby the best type of insole for the footwear was chosen and fabricated. The results of finite element analysis were validated using Pedar system and after performing the experimental tests both statically and dynamically. Experimental and numerical investigations suggested that the sole material of orthopedic shoe should be selected as styrene-butadiene rubber. The internal layers of styrene-butadiene rubber frame from top to bottom should be comprised of Plastazote-polyurethane with Kevlar fiber-silicon shore A6, which can be a suitable orthopedic boot in terms of proper stress and strain distribution. Generally, it could reduce the pressure exerted to the sole by 79% compared with barefoot.

Finite Element Analysis of Metal Flow of Finishing Groove in Hot Continuous Rolling Bar

2012 ◽  
Vol 510 ◽  
pp. 667-672
Author(s):  
Jia Lin Zhou ◽  
Chen Gang Pan ◽  
Xiao Yong Zhang
Keyword(s):  
Strain Distribution ◽  
Metal Flow ◽  
Dimensional Accuracy ◽  
Stress And Strain ◽  
Fe Model ◽  
Element Analysis ◽  
Iron And Steel ◽  
Expansion Angle ◽  
The Stability ◽  
Stress And Strain Distribution

This article established 3D FE model of dual-radius arc finishing groove and tangent expansion angle finishing groove using ANSYS / LS-DYNA software for Wuhan Iron and Steel plant Ф16 hot continuous bar, and analyzed metal flow pattern, stress and strain distribution of two types finishing grooves. The results show that surface stress and strain distribution of dual-radius arc finishing groove have better uniform than them of tangent expansion angle finishing groove, and dual-radius arc finishing groove ensures the stability of the rolled piece in finishing groove, improve the dimensional accuracy and surface quality of rolled finishing product.

The Strength Analysis of Aircraft Landing Gear Strut Based on ANSYS

2012 ◽  
Vol 490-495 ◽  
pp. 2686-2690 ◽  
Author(s):  
Fei Chen ◽  
Yong Lv ◽  
Zhi Wei Xing
Keyword(s):  
Strain Distribution ◽  
Landing Gear ◽  
Strength Analysis ◽  
Stress And Strain ◽  
Element Analysis ◽  
Damage Prediction ◽  
Aircraft Landing ◽  
Aircraft Landing Gear ◽  
Stress And Strain Distribution ◽  
Accurate Stress

Because the landing gear structure is complicated, it is difficult to draw accurate stress and strain distribution through the theoretical calculation. In this paper, based on the modeling and stress analysis of the buffer mechanism of aircraft landing gear, by converting the stress of a dynamic system into a static stress, the force of the landing gear struts are calculated. This paper analyzes the strength of the aircraft main landing gear by using computer simulation technology and finite element analysis, it provides an effective basis for maintenance and the damage prediction

Evaluation of Crosslink Density Using Material Constants of Ethylene-Propylene-Diene Monomer/Styrene-Butadiene Rubber with Different Nanoclay Loading: Finite Element Analysis-Simulation and Experimental

2020 ◽  
Vol 12 (5) ◽  
pp. 632-642 ◽  
Author(s):  
S. Vishvanathperumal ◽  
V. Navaneethakrishnan ◽  
G. Anand ◽  
S. Gopalakannan
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Energy ◽  
Tension Test ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Element Analysis ◽  
Strain Behavior ◽  
Styrene Butadiene

Nanoclay is used to enhance the mechanical properties of ethylene-propylene-diene rubber (EPDM)/styrene-butadiene rubber (SBR) blends. Sulphur (S), dicumyl peroxide (P), and mixed systems (S + P) were used as crosslinking or vulcanizing agents for the EPDM/SBR nanocomposites. The experimental data of the stress–strain behavior of EPDM/SBR blends with different nanoclay loading have been determined through a tension test. Nonlinear mechanical behaviors of the rubbers are described by strain energy functions in order to assurance that rigid body motions play no role in the constitutive law. The mathematical model such as the Mooney-Rivlin model based on the existence of strain energy density functions depends on the right Cauchy-Green's deformation tensor or Green's strain tensor. The experimental data are fitted to the Mooney-Rivlin model in order to find the rubber material constants. These constants are used to find the crosslinking density. A comparison between the experimental stress–strain behavior and finite element analysis of a uniaxial tension test at different nanoclay loading is presented.

Intensity Analysis on Heat Transfer of the Jet Plug-in Hot Blast Furnace

2011 ◽  
Vol 396-398 ◽  
pp. 1856-1859
Author(s):  
Xue Ping Wang ◽  
Ying Zhang ◽  
Pan Li ◽  
Zhen Wei Zhang
Keyword(s):  
Heat Transfer ◽  
Blast Furnace ◽  
Strain Distribution ◽  
High Heat ◽  
Structure Design ◽  
Large Temperature ◽  
Stress And Strain ◽  
Element Analysis ◽  
Hot Blast ◽  
Stress And Strain Distribution

This paper primarily focuses on the analysis on temperature, stress and strain distribution of the heat transfer in the jet plug-in hot blast furnace aiming at obtaining the parts of the heat transfer with relatively high heat stress according to the stress and strain distribution. The authors took advantage of the method of the finite element analysis to study the temperature field. Through the analysis, the authors can figure out that thermal stress can not be found in the highest temperature part, but in the parts with large temperature difference, and meanwhile this thesis puts forward the reasons causing these situations. The conclusion of this paper provides the basis for the further enhancement of the machine life and optimization of the structure design.

Performance Analysis of the Multi U-Shaped Bellows Based on CAE

2014 ◽  
Vol 800-801 ◽  
pp. 390-393
Author(s):  
Liang Zhou ◽  
Liang Li ◽  
Chen Yang Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Distribution ◽  
Elastic Stiffness ◽  
Constant Thickness ◽  
Axial Stiffness ◽  
Stress And Strain ◽  
Element Analysis ◽  
Number Of Layers ◽  
Stress And Strain Distribution

A certain thickness of two, three and four layers of axisymmetric finite element bellows model were built by Abaqus firstly. Then the axial stiffness and stress and strain distribution of multi U-shaped bellows were simulated by finite element analysis. The results showed that in the case of a constant thickness, with the increase of the number of layers of the bellows, the stiffness of the bellows would be significantly reduced, and in the case of large deformation, the overall stiffness of the bellows would change significantly and was divided into elastic stiffness and plastic stiffness.

Simulation and Optimal Design of Cylinder Block of Axial Piston Pump Based on ANSYS

2011 ◽  
Vol 186 ◽  
pp. 368-372 ◽  
Author(s):  
Hui Wang ◽  
Fan Long Meng
Keyword(s):  
Finite Element Analysis ◽  
Strain Distribution ◽  
Structure Optimization ◽  
Piston Pump ◽  
Cylinder Block ◽  
Stress And Strain ◽  
Axial Piston Pump ◽  
Element Analysis ◽  
Axial Piston ◽  
Stress And Strain Distribution

To study the stress and strain distribution of cylinder block of axial piston pump in the actual conditions，the entity model of cylinder block is established with Pro/E and Static Finite Element Analysis on the cylinder block model is applied with ANSYS after formulas deduction and calculation in MATLAB in this paper. The stress and strain distribution of the cylinder block in the actual conditions is obtained by simulation. Analyzed results provide a reference basis for structure optimization, finding failure reasons of the axial piston pump and prolonging the pump’s service life.

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