scholarly journals NUMERICAL INVESTIGATION ON THE FUSELAGE AIRFRAME OF LSU 05 NG AIRCRAFT

2020 ◽  
Vol 18 (2) ◽  
pp. 93
Author(s):  
M Hafid ◽  
Abian Nurrohmad ◽  
Redha Akbar Ramadhan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Investigation ◽  
Maximum Stress ◽  
Failure Criteria ◽  
Load Case ◽  
Hill Criterion ◽  
Simulation Results ◽  
Ground Condition

In this paper, numerical investigation on the fuselage structure of LSU 05 NG was carried out. This fuselage is designed to carry the payload up to 30 kg. Statical numerical analysis using finite element method was done using Simulia Abaqus. The fuselage structure that has been design consists of frame, longeron, and skin that can also be semi-monocoque structure. This airframe use combination of balsa and GFRP type of composite as the material. There are three load case: take-off condition, cruise condition, and landing condition. Tsai-hill failure criteria is used to investigate the strength of the composite structure due to the load that applied. Maximum stress from this calculation is 48 Mpa at the ground condition (take-off and landing) while the cruise stress analysis is 16 Mpa. The maximum tsai-hill criterion is 0,83. With such simulation results it can be said that the fuselage structure is still safe when operated and can also be optimized for several components so that the weight of the aircraft can be reduced. 

Numerical Study on Solidification Process and Shrinkage Porosity for Engine Block Casting

2010 ◽  
Vol 37-38 ◽  
pp. 753-756
Author(s):  
Jin Xiang Liu ◽  
Ri Dong Liao ◽  
Zheng Xi Zuo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Cylinder Head ◽  
Numerical Study ◽  
Solidification Process ◽  
Shrinkage Porosity ◽  
Temperature Distributions ◽  
Simulation Results ◽  
Casting Design

The latent heat releasing and the criterion for shrinkage porosity in solidification progress of casting are studied. A numerical analysis is presented for solidification progress of the cylinder head casting using finite element method. The temperature distributions of the casting in different solidification phases are solved, and the shrinkage porosity is predicted. Based on this, the solidification progress of casting is evaluated. The simulation results can offer a helpful reference for casting design of cylinder head casting.

scholarly journals Comparison Study of Analysis of Water Tower Structure Using Finite Element Method and Engineering Equation Solver

2018 ◽  
Vol 4 (1) ◽  
Author(s):  
Nanang Qosim ◽  
Putra M Pamungkas ◽  
Barkah Fitriyana ◽  
Wanda Pratomo ◽  
Marthan Lassandy
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Maximum Stress ◽  
Water Structure ◽  
Comparison Study ◽  
Maximum Deformation ◽  
Structure Of Water ◽  
Tower Structure ◽  
Simulation Results ◽  
Element Method

This study aims to compare the analysis results of the maximum deformation and maximum stress on water structure using finite element method and engineering equation solver (EES). Simulation results show that verification successfully performed, with deformation value obtained is convergent to certain value with maximum percentage of 0,40%. Further, the maksimum stress value is still under the allowable stress of material 160 MPa. Hence, the structure of water tower with a capacity of 500 liters is safe to use. The result of calculation using EES shows that the deformation value is 1.70 mm. This value is different about 0.31 or 18.24% compared to the deformation value of 2.01 mm using fine meshing on ANSYS.

scholarly journals The design method of rubber-metallic expansion joint

2018 ◽  
Vol 8 (1) ◽  
pp. 532-538
Author(s):  
Przemysław Jaszak ◽  
Janusz Skrzypacz ◽  
Konrad Adamek
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Experimental Test ◽  
Design Method ◽  
The Finite Element Method ◽  
Load Case ◽  
Expansion Joint ◽  
Expansion Joints ◽  
Hyperelastic Model

Abstract The paper present the method of designing a rubber expansion joints, intended for operation in the pressure class 25 bar. During the design used a numerical analysis,which based on the finite element method (FEM). The results from experimental test were used to correctly modeled the rubber or polyamide reinforcement. Basis on the obtained results, the hyperelastic model of the rubber was prepared, then the design of the rubber expansion joint was tested in different load case, i.e tensile or compressive deflection and pressurization.

Numerical investigation of ground tanks for storage subjected near-fault earthquakes

2021 ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Analysis ◽  
Numerical Investigation ◽  
Seismic Retrofitting ◽  
Physical Parameters ◽  
Dynamic Effects ◽  
Near Fault ◽  
Full State ◽  
Near Fault Earthquakes

Abstract Finite element method is known as the most common methods in a numerical analysis of reservoirs subjected to the influence of an earthquake. Investigating the effects of interaction between structures and fluid during the earthquake is among the major objectives of the present research. In this article, by selecting a variety of conventional modes of fluid storage, the dynamic effects of the reservoir and their mutual effects based on changes in physical parameters are analyzed. Unexpectedly, based on the results of this study, it was observed that the crisis situation always does not occur in the full state of the tank. Moreover, the filled and semi-filled reservoirs require seismic retrofitting for mode 10% below the tank height.

scholarly journals Application of Failure Criteria on Plywood under Bending

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4449
Author(s):  
Miran Merhar
Keyword(s):  
Mechanical Properties ◽  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Maximum Stress ◽  
Failure Criteria ◽  
The Finite Element Method ◽  
Stress Criterion ◽  
Composite Modulus ◽  
Element Method

In composite materials, the use of failure criteria is necessary to determine the failure forces. Various failure criteria are known, from the simplest ones that compare individual stresses with the corresponding strength, to more complex ones that take into account the sign and direction of the stress, as well as mutual interactions of the acting stresses. This study investigates the application of the maximum stress, Tsai-Hill, Tsai-Wu, Puck, Hoffman and Hashin criteria to beech plywood made from a series of plies of differently oriented beech veneers. Specimens were cut from the manufactured boards at various angles and loaded by bending to failure. The mechanical properties of the beech veneer were also determined. The specimens were modelled using the finite element method with a composite modulus and considering the different failure criteria where the failure forces were calculated and compared with the measured values. It was found that the calculated forces based on all failure criteria were lower than those measured experimentally. The forces determined using the maximum stress criterion showed the best agreement between the calculated and measured forces.

scholarly journals Numerical Simulation on The Onion Dryer Frame Capacity of 5 kg/hour

2018 ◽  
Vol 2 (2) ◽  
pp. 86
Author(s):  
Zulfikar Zulfikar
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Maximum Stress ◽  
Fem Simulation ◽  
Failure Criteria ◽  
Frame Structure ◽  
Maximum Deflection ◽  
Machine Structure ◽  
Element Method

<h1>Typical technology for processing red onion affects the quality of red onion produced. The process of drying red onion is one of the important factors in producing the best quality of red onion. Environmentally friendly and easy operation and maintenance technology is the desired technology. In the process of engine design, the strength of the material and structure are the main factors of the building of the machine. Calculation with finite element method (FEM) is the best choice to obtain information on stress distribution on a machine structure. In this study, the calculation of the FEM method was assisted by Ansys APDL 15.0 software. The objectives of this study were: (1) calculation of the load on the tray structure, (2) the distribution of stress on the tray structure, seat, and frame for red onion dryers, and (3) analyzing the strength of the material using the Tresca and Energy Distortion methods. The input load comes from the weight of the tray and red onion. The analytical method used is the finite element method with the type of structural analysis and Beam 3Node 189 element type. Based on the FEM simulation results, the maximum stress that occurs in the tray is 1.22 MPa and the maximum deflection is 0.0055 mm. The maximum stress in the tray support structure is 33.25 MPa and the maximum deflection is 0.014 mm. The maximum stress on the frame structure of the onion drying machine is 0.89 MPa and the maximum deflection is 0.000235 mm which occurs in the middle of the machine structure. Using the Tresca and Distortion Energy theories, it is found that the stresses that occur are still far from the failure criteria for all structures. Likewise, the deflection that occurs is very small so that the construction of the onion drying machine is safe to use.</h1>

Effect of the Porosity on Thermal Stress within TBCs Using Finite Element Method

2016 ◽  
Vol 849 ◽  
pp. 689-694
Author(s):  
Hui Hui Zhou ◽  
Peng Song ◽  
Hong Xing Liao ◽  
Tai Hong Huang ◽  
J.S. Lu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Thermal Barrier Coatings ◽  
Maximum Stress ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Bond Coats ◽  
Finite Element Software ◽  
Simulation Results ◽  
Thermal Tensile Stress

Thermal barrier coatings (TBCs) with NiCoCrAlY bond-coats (BC) and ceramic top coats (TBC) were prepared on IN738 superalloy by plasma spraying technology. Effect of porosity on the maximum stress under thermal cycling conditions was carried out by using finite element software ANSYS. The results showed that maximum axial thermal tensile stress in TBCs decreases from 868MPa to 498MPa with the increase of bond-coats porosity near the TGO/BC interface, and the maximum axial thermal compressive stress decreases from 1060MPa to 711MPa. The stress distribution changes with increasing bond-coats porosity near the TGO/BC interface. The simulation results are in agreement with the experiments, exhibiting a clearly evidence that the porous TBCs have a longer lifetime.

Upon Impact Numerical Modeling of Foam Materials

2017 ◽  
Vol 54 (2) ◽  
pp. 195-202
Author(s):  
Vasile Nastasescu ◽  
Silvia Marzavan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Modeling ◽  
Numerical Analysis ◽  
Numerical Methods ◽  
Boundary Conditions ◽  
General Character ◽  
Foam Material ◽  
Various Boundary Conditions ◽  
Specific Behaviour

The paper presents some theoretical and practical issues, particularly useful to users of numerical methods, especially finite element method for the behaviour modelling of the foam materials. Given the characteristics of specific behaviour of the foam materials, the requirement which has to be taken into consideration is the compression, inclusive impact with bodies more rigid then a foam material, when this is used alone or in combination with other materials in the form of composite laminated with various boundary conditions. The results and conclusions presented in this paper are the results of our investigations in the field and relates to the use of LS-Dyna program, but many observations, findings and conclusions, have a general character, valid for use of any numerical analysis by FEM programs.

The influence of infill density gradient on the mechanical properties of PLA optimized structures by additive manufacturing

2021 ◽  
pp. 146442072110071
Author(s):  
AIL Pais ◽  
C Silva ◽  
MC Marques ◽  
JL Alves ◽  
J Belinha
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Additive Manufacturing ◽  
Structural Optimization ◽  
Meshless Method ◽  
Load Case ◽  
Fused Filament Fabrication ◽  
Ductile Metals ◽  
Four Point Bending ◽  
Bending Load

The aim of this work is the development of a novel framework for structural optimization using bio-inspired remodelling algorithm adapted to additive manufacturing. The fact that polylactic acid (PLA, E = 3145 MPa (Young’s modulus) according to the supplier for parts obtained by injection) shows a similar parameterized behavior with ductile metals, in the sense that both materials are characterized by a bi-linear elastic-plastic law, allows to simulate and prototype parts to be further constructed in ductile metals at a lower cost and then be produced with more expensive fabrication processes. Moreover, cellular materials allow for a significant weight reduction and therefore reduction of production costs. Structural optimization algorithms based on biological phenomena were used to determine the density distribution of the infill density of the specimens. Several simple structures were submitted to distinct complex load cases and analyzed using the mentioned optimization algorithms combined with the finite element method and a meshless method. The surface was divided according to similar density and then converted to stereolitography files and infilled with the gyroid structure at the desired density determined before, using open-source slicing software. Smoothing functions were used to smooth the density field obtained with the remodeling algorithms. The samples were printed with fused filament fabrication technology and submitted to mechanical flexural tests similar to the ones analyzed analytically, namely three- and four-point bending tests. Thus, the factors of analysis were the smoothing parameter and the remodeling method, and the responses evaluated were stiffness, specific stiffness, maximum force, and mass. The experimental results correlated (obtaining accuracy of 35% for the three-point bending load case and 5% for the four-point bending load case) to the numerical results in terms of flexural stiffness and it was found that the complexity of the load case is relevant for the efficiency of the functional gradient. The fused filament fabrication process is still not accurate enough to be able to experimentally compare the results based of finite element method and meshless method analyses.

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