scholarly journals Structural analysis of deep soil loosening machine MAS-65

2019 ◽  
Vol 112 ◽  
pp. 03034 ◽  
Author(s):  
Mihai Gabriel Matache ◽  
Remus Marius Oprescu ◽  
Dragos Nicolae Dumitru ◽  
Gabriel Valentin Gheorghe ◽  
Dan Cujbescu ◽  
...  
Keyword(s):  
Structural Analysis ◽  
3D Model ◽  
Structural Integrity ◽  
Field Tests ◽  
Von Mises Stress ◽  
Strain Gages ◽  
Structural Failure ◽  
Deep Soil ◽  
Distribution Maps ◽  
Von Mises

Deep soil loosening machine MAS 65 is destined to work soil at depths exceeding 45 cm, thus the machine’s frame is subjected to loads which could affect its structural integrity. Within this paper a static structural analysis was performed on the machine’s 3D model using finite element method and strain and stress distribution maps were created. Using the Von Mises stress map there were identified several critical points which could fail during normal exploitation conditions and which should be monitored by strain gages during field tests in order to prevent structural failure.

scholarly journals Mechanical Strength Study of a Cranial Implant Using Computational Tools

2022 ◽  
Vol 12 (2) ◽  
pp. 878
Author(s):  
Pedro O. Santos ◽  
Gustavo P. Carmo ◽  
Ricardo J. Alves de Sousa ◽  
Fábio A. O. Fernandes ◽  
Mariusz Ptak
Keyword(s):  
Structural Integrity ◽  
Mechanical Performance ◽  
Skull Fracture ◽  
Human Head ◽  
Element Model ◽  
Von Mises Stress ◽  
Cranial Implant ◽  
Von Mises ◽  
Two Parameters ◽  
The Brain

The human head is sometimes subjected to impact loads that lead to skull fracture or other injuries that require the removal of part of the skull, which is called craniectomy. Consequently, the removed portion is replaced using autologous bone or alloplastic material. The aim of this work is to develop a cranial implant to fulfil a defect created on the skull and then study its mechanical performance by integrating it on a human head finite element model. The material chosen for the implant was PEEK, a thermoplastic polymer that has been recently used in cranioplasty. A6 numerical model head coupled with an implant was subjected to analysis to evaluate two parameters: the number of fixation screws that enhance the performance and ensure the structural integrity of the implant, and the implant’s capacity to protect the brain compared to the integral skull. The main findings point to the fact that, among all tested configurations of screws, the model with eight screws presents better performance when considering the von Mises stress field and the displacement field on the interface between the implant and the skull. Additionally, under the specific analyzed conditions, it is observable that the model with the implant offers more efficient brain protection when compared with the model with the integral skull.

scholarly journals UNCONVENTIONAL MATERIAL PART FEM ANALYSIS

2016 ◽  
Vol 2 (1) ◽  
pp. 20-25
Author(s):  
Michal Tropp ◽  
Michal Lukac
Keyword(s):  
3D Model ◽  
Fem Analysis ◽  
Carbon Composite ◽  
Von Mises Stress ◽  
Composite Component ◽  
Fem Model ◽  
Material Part ◽  
Alternative Materials ◽  
Von Mises ◽  
Ansys Workbench

The article covers the usability of alternative materials in vehicle construction. The paper elaborates upon the setup of the process and analysis of the results of the carbon composite component FEM model. The 3D model, used for the examination, is a part of axle from an alternative small electric vehicle. The analysis was conducted with the help of MSC Adams and Ansys Workbench software. Color maps of von Mises stress in material and total deformations of the component are the results of calculation.

Use of Finite-Element Stress Analysis in the Design of a Tank-Cannon-Launched Training Projectile

1994 ◽  
Author(s):  
Michael S. L. Hollis
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Structural Integrity ◽  
Compressive Loading ◽  
Structural Failure ◽  
Finite Element Stress Analysis ◽  
Von Mises ◽  
Current Kinetic ◽  
A Current ◽  
Stress Analyses

Abstract The U.S. Army Armament Research. Development, and Engineering Center (ARDEC) recently expressed a need for a tank-cannon-launched training projectile with reduced penetration capability. The expressed primary design goals for this projectile were to minimize the probability of personnel injury and materiel loss in the event of an accidental impact during a training exercise. In order to meet these design goals, the solid-steel flight body of a current kinetic energy (KE) training projectile, the M865IP, was replaced with a hollow aluminum configuration. Because of the incorporation of aluminum, the structural integrity of the entire projectile during launch was put in question. Thus, a thorough stress analysis of the new design was conducted to alleviate concerns about its structural integrity. Two-dimensional, axisymmetric, quasi-static stress analyses were performed on two new KE training projectile designs. The first analysis indicated that structural failure was possible in the aft portion of the projectile due to compressive loading by the gun gases. Structural failure in this case would be circumferential yielding of the hollow flight body. The aft portion of the round was redesigned, and subsequent stress analysis showed the possibility of structural failure to be resolved. The finite-element modeling approach, the applied boundary conditions, and the results of the stress analyses conducted, based on use of the von Mises failure criterion, will be discussed in detail.

scholarly journals Mixing Chamber for Preparation of Nanorefrigerant

2020 ◽  
Vol 21 (1) ◽  
pp. 32-40
Author(s):  
Nur Fazlin Che Halim ◽  
Nor Azwadi Che Sidik
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Structural Analysis ◽  
Yield Strength ◽  
Wall Thickness ◽  
Von Mises Stress ◽  
Chamber Design ◽  
Mixing Chamber ◽  
Von Mises ◽  
Material Mixing

The last decade has seen the rapid advancement of nanofluid in several ways. Nanofluid based on the refrigerant have been introduced as nanorefrigerant in recent years due to their significant effects on the efficiency of heat transfer. Previous studies showed some limitation in ways of dispersing nanoparticles into refrigerant. Hence, a new idea of adding nanoparticles into refrigerant has been presented. A mixing chamber has been designed to mix nanoparticles into high pressure refrigerant. The mixing chamber design is drawn with five different wall thickness which are 2 mm, 4 mm, 6 mm, 8 mm and 10 mm to investigate the sturdiest design that can withstand high pressure. Static structural analysis is performed to all designs with different wall thickness on SolidWorks Simulation. The maximum values of von Misses stress and displacement has been presented in this paper. Validation of the results are made by comparing the maximum values of von Mises stress with yield strength of the material. Mixing chamber with wall thickness of 10 mm showed the best results.

scholarly journals Multiaxial fatigue criteria applied to motor crankshaft in thermoelectric power plants

2019 ◽  
Vol 300 ◽  
pp. 04003
Author(s):  
Marcos Venicius S. Pereira ◽  
Fathi Aref Darwish ◽  
André Feiferis ◽  
Tiago Lima Castro
Keyword(s):  
Thermoelectric Power ◽  
Power Plants ◽  
Structural Integrity ◽  
Fatigue Behavior ◽  
Multiaxial Fatigue ◽  
Stress Fields ◽  
Von Mises Stress ◽  
Thermoelectric Power Plants ◽  
Octahedral Shear Stress ◽  
Von Mises

Fatigue failures of motor crankshafts operating in thermoelectric power plants have recently been reported. Stress fields provided by finite element calculations at critical points of a crankshaft that failed in service are used to test the structural integrity of the component. Taking into account the fact that the stresses acting at a given point are most likely out of phase, multiaxial fatigue criteria based on the von Mises stress are considered to be most suitable for predicting the fatigue behavior of the crankshaft. Using the von Mises stress, it was also possible to apply octahedral shear stress-based criteria and the results obtained have indicated that the crankshaft made of DIN 34CrNiMo6 steel should not suffer fatigue failure under the action of the stress fields in question. However, such failures have been occurring and this apparent discrepancy is presented and briefly discussed in the present study.

An Analytical Study of the Structural Integrity of an LPG Storage Tank under Wind Load

2015 ◽  
Vol 741 ◽  
pp. 115-118 ◽  
Author(s):  
Bong Kwan Park ◽  
Jae Min Kim ◽  
Chang Min Keum ◽  
C. Kim ◽  
Heon Oh Choi
Keyword(s):  
Storage Tank ◽  
Structural Integrity ◽  
Element Model ◽  
Wind Load ◽  
Von Mises Stress ◽  
Shell Elements ◽  
Analytical Technique ◽  
Von Mises ◽  
Design Factors ◽  
Important Design

Since the wall thicknesses of most large LPG storage tanks are thin while their diameters are large, their structural integrity is one of the most important design factors. The tanks are mainly located near the waterfront for efficient transport and accessibility. This leads to exposure to wind loads, which should be considered in the design of the tanks. This paper describes an analytical technique for determining the structural integrity of a 45m diameter-LPG storage tank in the case of a wind load based on API 620 code. A finite element model for the tank was made using shell elements and analyzed under 50 m/s wind. The calculated maximum von-Mises stress was 103 MPa whereas the yield strength of tank’s material is 222 MPa. This result shows that the structural integrity of the tank is assured.

scholarly journals Patient-Specific Static Structural Analysis of Femur Bone of different lengths

2018 ◽  
Vol 12 (1) ◽  
pp. 108-114 ◽  
Author(s):  
K.N. Chethan ◽  
Shyamasunder N. Bhat ◽  
Mohammad Zuber ◽  
Satish B. Shenoy
Keyword(s):  
Body Weight ◽  
Structural Analysis ◽  
Anatomical Variation ◽  
The Body ◽  
Von Mises Stress ◽  
Patient Specific ◽  
Element Analysis ◽  
Load Bearing ◽  
Femur Bone ◽  
Von Mises

Background:The femur bone is an essential part of human activity, providing stability and support in carrying out our day to day activities. The inter-human anatomical variation and load bearing ability of humans of different heights will provide the necessary understanding of their functional ability.Objective:In this study, femur bone of two humans of different lengths (tall femur and short femur) were subjected to static structural loading conditions to evaluate their load-bearing abilities using Finite Element Analysis.Methods:The 3D models of femur bones were developed using MIMICS from the CT scans which were then subjected to static structural analysis by varying the load from 1000N to 8000N. The von Mises stress and deformation were captured to compare the performance of each of the femur bones.Results:The tall femur resulted in reduced Von-Mises stress and total deformation when compared to the short femur. However, the maximum principle stresses showed an increase with an increase in the bone length. In both the femurs, the maximum stresses were observed in the medullary region.Conclusion:When the applied load exceeds 10 times the body weight of the person, the tall femur model exceeded 134 MPa stress value. The short femur model failed at 9 times the body weight, indicating that the tall femur had higher load-bearing abilities.

scholarly journals Finite Element Analysis of External Fixator for Treating Femur Fracture: Analysis on Stainless Steel and Titanium as Material of External Fixator

2021 ◽  
Vol 17 (3) ◽  
pp. 274-284
Author(s):  
Nurnedilah Mohammad Kata ◽  
Nur Afikah Zainal Abidin ◽  
Aishah Umairah Abd Aziz ◽  
Abdul Halim Abdullah ◽  
Ng Bing Wui ◽  
...  
Keyword(s):  
Stainless Steel ◽  
External Fixator ◽  
3D Model ◽  
Femur Fracture ◽  
Von Mises Stress ◽  
External Fixators ◽  
Element Analysis ◽  
Suitable Material ◽  
Medical Software ◽  
Von Mises

An external fixator device is a medical implant used to keep fractured bones stabilized and in alignment. It consists of pins which are placed into the bone, extending outside the surface of the skin, and attached to a rigid external rod to keep it in place. The aim of this study is to investigate the most suitable material used for the external fixator. Firstly, the 3D model of two unilateral uniplanar external fixator with the properties of titanium and stainless steel were constructed at Solidworks software with all the other parameters set to constant. Meanwhile, CT images of the lower limb were used to reconstruct a 3D model of the femur fracture at Mimics Medical software. Positioning and meshing of both the external fixator and the femur done at 3-Matics Medical and export as Patran for simulation at Marc Mentat software. 375 N load was applied at the most proximal femur to simulate stance phase of a gait cycle. From the findings, external fixator by using stainless steel as material properties have lower maximum von Mises Stress (18.40 MPa) at the femur and (103.69 MPa) at the fixator compared to the titanium (32.38 MPa) at the femur and (182.93 MPa) at the fixator. The result shows a difference of 75% of maximum von Mises Stress at the femur and the external fixator. Configuration by using stainless steel displaced 1.15 mm at the femur and 1.01 mm at the fixator which almost double value of displacement for titanium material for both femur (2.35 mm) and external fixator (2.11 mm). In conclusion, stainless steel external fixators provide better stability when compared to titanium external fixators. 

scholarly journals Streamlining Metal Poles

2000 ◽  
Vol 122 (04) ◽  
pp. 68-70
Author(s):  
Ioan Giosan ◽  
Ted Brockman
Keyword(s):  
Transmission Lines ◽  
Structural Integrity ◽  
Base Plate ◽  
Von Mises Stress ◽  
Roll Forming ◽  
Forming Process ◽  
Pole Type ◽  
Von Mises ◽  
The Impact ◽  
Stress Analyses

This article discusses that an engineering firm is using software to ensure the structural integrity of all types of pole designs. West Coast Engineering (WCE) Group in Delta, British Columbia, Canada, performed several linear stress analyses using software to optimize the insulator bracket, which supports the transmission lines on the tangent poles. Physical testing was used to verify the accuracy of the analysis results. WCE began the structural analyses by analyzing the shafts of each pole type under ultimate loading, which was determined by Ian Hayward International using standard industry calculations. WCE performed linear static stress analyses on the models and evaluated the von Mises stress criteria for ductile materials to assess the stress results. With the pole shaft and base plate structures verified, engineers focused the next analysis on the insulator brackets of the tangent structure to optimize the load bearing capability and material thickness. With the predictable loading capacity requirements confirmed for the designs, WCE expanded the study to include a simulation of the impact loading that can result from a head-on vehicle collision. WCE is continuing the use of Algor software in the design of poles and in the development of new pole manufacturing equipment. Currently, the company is using it to simulate and optimize a roll forming process.

scholarly journals Efficient Mounting of a Tank for the Transport of Flammable Liquids on a Freight Vehicle

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8385
Author(s):  
Dimitrios Koulocheris ◽  
Clio Vossou
Keyword(s):  
Dynamic Behavior ◽  
Structural Integrity ◽  
Load Sharing ◽  
Von Mises Stress ◽  
Efficient Design ◽  
Fe Method ◽  
Liquid Material ◽  
Von Mises ◽  
Supporting Structures

The design and construction of tanks used for the carriage of dangerous liquid materials fall within strict standards (i.e., EN13094:2015, R111). According to these standards, their supporting structures (Ss), used for the mounting of the tank on the freight vehicle, need to be able to sustain the developed stresses. Optimizing the number of supporting structures can lead to more efficient tank designs that allow the tank to transport more liquid material and need less time to be manufactured. In the present paper, the effect of the reduction of the number of supporting structures in (a) the structural integrity of the tank construction, (b) its dynamic behavior and (c) the load-sharing of the tank to the axles of the freight vehicle is investigated using the finite element (FE) method. As a case study a box-shaped tank mounted on a four-axle freight vehicle with a technical permissible maximum laden mass of 35 tn, five Ss are used. Four FE models with a decreasing number of Ss were built in ANSYS® 2020R1 CAE Software and their structural integrity was investigated. For each design, a feasible design was developed and evaluated in terms of structural integrity, dynamic behavior and axle load distribution. The results of the FE analysis were reviewed in terms of maximum equivalent Von Mises stress and stress developed on the welding areas. Additionally, the axle-load sharing was qualitatively assessed for all feasible designs. The main outcome of this work is that, overall, the use of two Ss leads to a more efficient design in terms of the manufacturing and the mounting of the tank construction on the vehicle and on a more efficient freight vehicle. More specifically, the reduction of the number of Ss from five to two lead to reduction of the tank tare weight by 9.6% with lower eigenfrequencies.

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