scholarly journals Design and Analysis of The Energy Storage and Return (ESAR) Foot Prosthesis Using Finite Element Method

2022 ◽  
Vol 1 (2) ◽  
pp. 59-64
Author(s):  
Alfiana Fitri Istiqomah ◽  
Rifky Ismail ◽  
Deni Fajar Fitriyana ◽  
Sulistyo Sulistyo ◽  
Akmal Putra Fardinansyah ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Decision Making ◽  
Finite Element ◽  
Energy Storage ◽  
Gait Cycle ◽  
Metabolic Energy ◽  
Von Mises Stress ◽  
Heel Strike ◽  
Abnormal Gait ◽  
Element Method

ABSTRACT. Disability issue has increased in recent years due to the high number of accidents and vascular disease. Loss of limb function for people with amputations often results in an abnormal gait. Energy Storage And Return (ESAR) foot prostheses provide an alternative to help improve gait and minimize metabolic energy expenditure during the walking phase of amputees. This study used 3 designs with models from the Catia V5 Software. The finite element method analysis used Ansys Workbench 18.1 software to evaluate the three designs with a loading of 1.2 times the user's body weight with a maximum weight of 70 kg in normal walking activities. The simulated material is carbon fiber prepreg which has tensile strength, Young's modulus, Poisson ratio, and density of 513.72 MPa, 77.71 GPa, 0.14, and 1.37 g/cm3. The decision-making matrix method is used to determine the best foot prosthesis design according to predetermined criteria. The highest value in the decision-making matrix is 76 in Design 3. The chosen design (Design 3) after gait cycle analysis has a maximum von Mises stress value of 76.956 MPa and the safety factor value for each gait cycle heel strike loading model is 1.0762; foot flat 3.2509; toe-off 6.6263.

scholarly journals Simulation-based Prediction of Structural Design Failure in Fishing Deck Machinery a Hydraulic Type with Finite Element Method

2019 ◽  
Vol 130 ◽  
pp. 01001
Author(s):  
Agri Suwandi ◽  
Dede Lia Zariatin ◽  
Bambang Sulaksono ◽  
Estu Prayogi ◽  
I Made Widana
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Tensile Strength ◽  
Ultimate Tensile Strength ◽  
Structural Design ◽  
Simulation Analysis ◽  
Poisson Ratio ◽  
Von Mises Stress ◽  
Material Base ◽  
Element Method

The fishing deck machinery is the tools used to collect fish in fishing activities. Fishing deck machinery is intended to improve the effectiveness of fishing operations. The mission of the Ministry of Marine Affairs and Fishery Year 2015-2019 in the Regulation of the Minister of Marine and Fisheries No. 45/PERMEN-KP/2015 which is a priority is to provide assistance for fishing facilities for fishermen; it is necessary to develop and optimize fishing deck machinery. To assure the safety and dependability of these fishing deck machinery, calculations, simulation and functional tests are needed. This paper discusses the prediction of structural failure in the design of fishing deck machinery a hydraulic type with finite element method simulation approach. The results of the FEM simulation analysis are (i) the maximum value of von-Mises stress is greater than the ultimate tensile strength of the material; (ii) 1st principal stress value minimum is smaller than the ultimate tensile strength of material; (iii). the Poisson ratio value higher than the Poisson ratio value of the material. Base on the simulation result, the structural design of fishing deck machinery is safety.

New Specimen for Determination of the State of Plane Stress

2013 ◽  
Vol 486 ◽  
pp. 227-232 ◽  
Author(s):  
Vladimir Goga
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Plane Stress ◽  
Testing Machine ◽  
Von Mises Stress ◽  
Special Equipment ◽  
Tensile Testing Machine ◽  
Principal Axes ◽  
Element Method

This paper presents new design of the structural specimen for plane stress analysis. Requirement was that the specimen is loaded by universal tensile testing machine without any special equipment. Specimen was analyzed using finite element method in ANSYS Workbench software. Finite element method was also used for simulation of strain gauge measurement to determine principal stresses, equivalent von Mises stress and orientation of the principal axes in the center of specimen. Finally, experimental stress analysis using strain gauges was performed on real specimen. Results from experimental measurements and numerical simulations were compared.

Design Optimization of Electrical Power Contact Using Finite Element Method

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Amine Beloufa
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Resistance ◽  
Electrical Contact ◽  
Electrical Power ◽  
Experimental Tests ◽  
Contact Temperature ◽  
Von Mises Stress ◽  
Electrical Contact Resistance ◽  
Element Method

Automotive connectors in modern car generations are submitted to high current; this can cause many problems and requires the minimization of their electrical contact resistances. The new major contribution of this work is the optimization by finite element method of contact resistance, contact temperature, design, and mechanical stress of sphere/plane contact samples. These contact samples were made with recent high-copper alloys and were subjected to indentation loading. Experimental tests were carried out in order to validate the developed numerical model and to select the material which presents a low contact temperature and contact resistance. Another model with multipoint contacts was developed in order to minimize electrical contact resistance and contact temperature. Shape optimization results indicate that the volume of contact samples was reduced by 12%. The results show also for the model with multipoint contacts that the contact resistance was reduced by 41%, contact temperature by 22% and maximum Von Mises stress by 49%. These several gains are more interesting for the connector designers.

scholarly journals Finite element analysis of the tibial component alignment in frontal and sagittal plane in total knee arthroplasty

2021 ◽  
Vol 68 (3) ◽  
pp. 374-378
Author(s):  
Roman Popescu ◽  
◽  
Stefan Cristea ◽  
Adrian Marius Pascu ◽  
Valentin Oleksik ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Tibial Component ◽  
Sagittal Plane ◽  
Frontal Plane ◽  
Von Mises Stress ◽  
The Finite Element Method ◽  
Tibial Resection ◽  
Von Mises ◽  
Element Method

Background. This study aims to analyze the tibial component using the finite element method by cutting the tibial in frontal and sagittal planes at an angle between 1.5° (valgus and anterior tilt) and -1.5° (varus and posterior tilt). Methods. This experimental study used the finite element method as an useful tool for simulating the positioning of the tibial component in order to create a personal pre-operative planning. For the finite element method analysis, a geometrical model of a tibia from a cadaver was three – dimensionally scanned and the tibial component, polyethylene and cement, were three-dimensionally shaped in Computer-Aided Design program using material data such as Young modulus (gigapascal – GPa) and the Poisson coefficient. The analysis determined the equivalent von Mises stress, the maximum displacement of the components and the equivalent von Mises deformation. The results showed that equivalent tension and deformation have higher values in the tibia and the polyethylene, which deform faster than cement and the tibial component. In our study, we chose to simulate the tibial resection at a cutting angle ± 1.5° from neutral positioning (which is represented in frontal plane by the perpendicular on the mechanical axis and in sagittal plane by the posterior slope of 7 degree) in frontal and sagittal plane in order to find the minimum threshold from which the tibial component malalignment may begin to determine unfavorable effects. Results. Our results have shown detrimental effects begin to appear for the polyethene component at -1.5° in frontal plane, and the rest of the components at 1.5° in sagittal plane. Conclusion. This finding leads us to propose preoperative planning based on personal calculus of predefined angles, which may show the surgeon the optimal implantation position of the tibial component.

Discharging of Nano-Enhanced PCM via Finite Element Method

2018 ◽  
pp. 234-267
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Energy Storage ◽  
Liquid Phase ◽  
Phase Change ◽  
Thermal Energy ◽  
Supply And Demand ◽  
Storage And Retrieval ◽  
Solid Liquid ◽  
Element Method

Latent heat thermal energy storage systems (LHTESS), which work based on energy storage and retrieval during solid-liquid phase change, is used to establish balance between energy supply and demand. LHTESS stores and retrieves thermal energy during solid-liquid phase change, while in SHTESS phase change doesn't occur during the energy storage and retrieval process. LHTESS has a lot of advantages in comparison to SHTESS. The most important one is storing a large amount of energy during phase change process, which makes the energy storage density in LHTESS much higher than SHTESS. Because of this property, LHTESS have a wide application in different cases, such as solar air dryer, HVAC systems, electronic chip cooling, and engine heat recovery. The main restriction for these systems is thermal conductivity weakness of common PCMs. In this chapter, the method of adding nanoparticles to pure PCM and making nano-enhanced phase change material (NEPCM) and using fin with suitable array are presented to accelerate solidification process. The numerical approach which is used in this chapter is standard Galerkin finite element method.

scholarly journals The Mechanical Behavior of Bone Cement in THR in the Presence of Cavities

2014 ◽  
Vol 4 (3) ◽  
pp. 625-630
Author(s):  
A. Benouis ◽  
B. Serier ◽  
B. Bachir Bouiadjra
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Bone Cement ◽  
Von Mises Stress ◽  
Lateral Part ◽  
The Finite Element Method ◽  
Breaking Strain ◽  
Von Mises ◽  
Element Method

In this work we analyze three-dimensionally using the finite element method, the level and the Von Mises stress equivalent distribution induced around a cavity and between two cavities located in the proximal and distal bone cement polymethylmethacrylate (PMMA). The effects of the position around two main axes (vertical and horizontal) of the cavity with respect to these axes, of the cavity - cavity interdistance and of the type of loading (static) on the mechanical behavior of cement orthopedic are highlighted. We show that the breaking strain of the cement is largely taken when the cement in its proximal-lateral part contains cavities very close adjacent to each other. This work highlights not only the effect of the density of cavities, in our case simulated by cavity-cavity interdistance, but also the nature of the activity of the patient (patient standing corresponding to static efforts) on the mechanical behavior of cement.

Stochastic Finite Element Method (FEM) and Design of Experiments for Pressure Vessel and Piping (PVP) Decision Making

2006 ◽  
Author(s):  
Jeffrey T. Fong ◽  
James J. Filliben ◽  
Roland deWit ◽  
Barry Bernstein
Keyword(s):  
Finite Element Method ◽  
Decision Making ◽  
Finite Element ◽  
Design Of Experiments ◽  
Single Crystal Silicon ◽  
Quantitative Measure ◽  
Crystal Silicon ◽  
Stochastic Fem ◽  
Anisotropic Elastic ◽  
Element Method

Using an example from a recent study of the finite element method (FEM) solutions of the natural frequencies of single-crystal silicon cantilevers in atomic force microscopy (AFM), we present the results of an analysis using two powerful tools of engineering statistics, namely, (a) stochastic FEM, and (b) design of experiments. The analysis of the FEM results using ABAQUS, ANSYS, and LS-DYNA anisotropic elastic element types yields conclusions that engineers can use to justify decisions with quantitative measure of uncertainties. For PVP engineers, we show with an example that this methodology is equally applicable to their decision making process and the appropriate risk assessment.

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