scholarly journals Introduction to Finite Element Methods in Engineering

2020 ◽  
Vol 06 (09) ◽  
pp. 167-174
Author(s):  
Gomasa Ramesh Mandala Sheshu Kumar and Palakurthi Manoj Kumar
Keyword(s):  
Applied Sciences ◽  
Finite Element ◽  
Structural Engineering ◽  
Numerical Technique ◽  
Structural Members ◽  
Large Problem ◽  
Sufficient Time ◽  
Structural Behaviour ◽  
Flow Heat ◽  
Transfer Problems

Finite Element Method is very useful powerful technique. FEM is espescially used in civil and structural engineering disciplines, and other branch disciplines and applied sciences are also used. The main aim of FEM is reducing the time for large problem calculations. It is a numerical method, so easy to solve with sufficient time and accurately. By using FEM analyse the structural behaviour of structures and it is also useful for non-structural members also. It is one of the important numerical technique. It is used to solve problems in engineering disciplines in a mathematical way. It is used for structural analysis, fluid flow, heat transfer and mass transfer problems etc. there are number of softwares are available for FEM. In this some important are Ansys, Cosmos, Nisa, Nastran, Sap etc. there are most important principles are there. Which are really useful. In this paper, we discuss about introduction to FEM, dicretization, element and node, types of elements in FEM, some important equations.

Numerical Analysis of Thin Plates with Holes

2016 ◽  
Vol 857 ◽  
pp. 154-158 ◽  
Author(s):  
P.V. Gokul ◽  
Bennet Kuriakose ◽  
Salini Theres N. Kurian
Keyword(s):  
Finite Element ◽  
Pitting Corrosion ◽  
Structural Engineering ◽  
Aerospace Engineering ◽  
Steel Plates ◽  
Thin Plates ◽  
Structural Members ◽  
Strength Assessment ◽  
Finite Element Software ◽  
Shape And Size

Plates are the important structural members finding applications in the field of structural engineering, ship technology and aerospace engineering. Holes are often provided in the plates for the purpose of services and aesthetics. Pitting corrosion can also induce holes on the plates, thereby inducing stress concentration and redistribution of stress around the hole. In this paper, the popular finite element software ANSYS is used for the static analysis of thin plates with holes. The influence of shape and size of the hole on the stress distribution of plate is also analysed. The study can form foundation for strength assessment of steel plates with holes, especially residual strength of plates subjected to pitting corrosion.

scholarly journals The Structural Behaviour of a Ship‟s Sub-Block During Lifting Operation

2019 ◽  
Vol 8 (12) ◽  
pp. 5566-5571
Keyword(s):  
Finite Element ◽  
Structural Members ◽  
Structural Behaviour ◽  
Acceptance Criteria ◽  
Element Analysis ◽  
Utilization Factor ◽  
Plate Deformation ◽  
Deflection Analysis ◽  
Block Based

The process of lifting a ship’s block is one of the important process in shipbuilding. The purpose of lifting or transfering of the blocks is to relocate the block to a new position before joining with other blocks. Prior to the lifting operation of ship’s sub-block, some stress and deflection analysis shall be done, in order to assess the magnitude of the deformation and the stresses acting on the structural members of the block. Based on the assessment, some changes in lifting operation can be intiated for example changing the lifting eye pad location to minimize plate deformation and bucking of structural members. In this study, the structural behaviour of a block was investigated using basic finite element method in order to simulate the deflections and stresses during the lifting operation. The initial dimension of the sub-block that was being investigated are with its dimensions: 21 meters in length, 16 meters in width, 4 meters in height. The type of material of all the structural components used in the sub-block is High Tensile Steel DH36. The investigation used Multiframe software. There are four case studies conducted with varying padeye location and number of lifting eye pads used in a single lifting. The sub block is approximately at 160 tonnes. These results were assessed with the DNV-GL acceptance criteria which can be found in DNV-GL Rules for finite element analysis. The highest yield ulitilization factor was found in case study 3 at 0.864, where it did not comply with the permissible coarse mesh yield utilization factor which is limited to 0.80. The lowest yield utilization factor was found in case study 2 at 0.278. Using the DNV-GL acceptance criteria it is concluded that case study 2 is the best configuration in lifting the sub-block.

scholarly journals Improvement of Structural Behaviour of Bubble Slab by Changing Bubble Thickness

2020 ◽  
Vol 9 (1) ◽  
pp. 372-379
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Load Transfer ◽  
Middle Layer ◽  
Structural Members ◽  
Analysis Method ◽  
Structural Behaviour ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Force Reaction

Deflection of slab is the most important parameter by which we can calculate the depth of slab which is depend on total loads applied on the slab and span of slab between two column. The concept of bubble slab in which middle layer concrete is replaced by HDPE bubble which will helps to reduced its self-weight, deflection, moments & force reactions. The criteria of choosing suitable thickness of HDPE bubble are well mentioned in this paper with suitable examples so we can easily use that thickness value in practical on site. Static analysis of several models is done by finite element analysis method with tetra meshing by using Ansys ver. 15.0 as an analyzing tool. In this paper, results clearly specifies the structural behaviour change of bubble slab by changing its HDPE bubble thickness as well as its also specify the best thickness value of HDPE bubble. Bubble slab will be more useful on those structures in which intermediates columns is not required when the span of conventional slab is large then its deflection, moments & force reaction values is greater by which its depth is increased which makes conventional slab heavy so its total self-weight loads are transfer to column to footing which makes both increases in size & uneconomical. If we used the concept of bubble slab our nearly 35% self-weight of slab is reduced which positively effect on load transfer to other structural members and by this procedure whole structure will be more stable, durable & economical.

scholarly journals STUDY OF THE FIRE PERFORMANCE OF HYBRID STEEL-TIMBER CONNECTIONS WITH FULL-SCALE TESTS AND FINITE ELEMENT MODELLING

2016 ◽  
Author(s):  
Aaron O. Akotuah ◽  
Sabah G. Ali ◽  
Jeffrey Erochko ◽  
Xia Zhang ◽  
George V. Hadjisophocleous
Keyword(s):  
Finite Element ◽  
Load Ratio ◽  
Full Scale ◽  
Test Results ◽  
Structural Members ◽  
Fire Performance ◽  
Shear Connection ◽  
Timber Connections ◽  
Full Scale Tests ◽  
Connection Design

Connection design is critical in timber buildings since the connections tend to have lower strength than the structural members themselves and they tend to fail in a brittle manner. The effect of connection geometry on the fire performance of a hybrid steel-timber shear connection is investigated by full-scale testing. These tests were conducted by exposing the test specimens to the standard time-temperature curve defined by CAN/ULC-S101 (CAN/ULC-S101, 2007). Test results showed that the fire resistance of these connections depends on the load ratio, the type of connection and the relative exposure of the steel plate to fire. Finite element models of the connections under fire were constructed using ABAQUS/CAE and these were validated using the test results. These numerical model results correlate well with test results with ±8.32% variation.

scholarly journals Efficient Alternative for Construction of the Linear System Stemming from Numerical Solution of Heat Transfer Problems via FEM

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Estaner Claro Romão
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Linear System ◽  
Numerical Solution ◽  
The Finite Element Method ◽  
Numerical Application ◽  
System Building ◽  
Efficient Alternative ◽  
Transfer Problems

This paper proposes an efficient alternative to construction of the linear system coming from a solution via the Finite Element Method that is able to significantly decrease the time of construction of this system. From the presentation of the methodology used and a numerical application it will be clear that the purpose of this work is to be able to decrease 6-7 times (on average) the linear system building time.

DQFEM Analyses of Static and Dynamic Nonlinear Elastic-Plastic Problems Using a GSR-Based Accelerated Constant Stiffness Equilibrium Iteration Technique

2001 ◽  
Vol 123 (3) ◽  
pp. 310-317 ◽  
Author(s):  
Chang-New Chen
Keyword(s):  
Finite Element ◽  
Numerical Technique ◽  
Time Integration ◽  
Differential Quadrature ◽  
Element Discretization ◽  
Constant Stiffness ◽  
Structural Problems ◽  
Nonlinear Structural ◽  
Numerical Time Integration ◽  
Nonlinear Elastic

An integrated numerical technique for static and dynamic nonlinear structural problems adopting the equilibrium iteration is proposed. The differential quadrature finite element method (DQFEM), which uses the differential quadrature (DQ) techniques to the finite element discretization, is used to analyze the static and dynamic nonlinear structural mechanics problems. Numerical time integration in conjunction with the use of equilibrium iteration is used to update the response history. The equilibrium iteration can be carried out by the accelerated iteration schemes. The global secant relaxation-based accelerated constant stiffness and diagonal stiffness-based predictor-corrector equilibrium iterations which are efficient and reliable are used for the numerical computations. Sample problems are analyzed. Numerical results demonstrate the algorithm.

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