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lab report fea bachelor engineering
Typology: Lab Reports
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There are three basic primary steps involved in developing a 3D static structural analysis. The first step is the creation of the structure geometry. ANSYS Workbench have its own geometry builder. Otherwise, the structure geometry can be created in any computer aided design (CAD) software and then imported into the ANSYS module.Then choose material from library or provide basic properties of own material. Next is to apply loads (forces, moments, pressure), set boundary conditions. The second step is creating the mesh. Meshing is the process of describing the structure using mesh of different shapes and sizes, as cubes, prism, tetrahedral, hexacore, or hybrid volumes. For each of these mesh units, the solid particulars are computed using the numerical method in the ANSYS. The developed mesh is then imported into the ANSYS and the solution is obtained using different solvers depending on the type of analysis. Finally, the results are ready to analyzed using a analysis tool in ANSYS such as to find total deformation ,equivalent stress (von-mises) and safety factor. Plotting a model’s deformation often provides a “reality check” in structural analysis. Verifying the general nature (direction and amount) of deflection can help avoid obvious mistakes in model setup. Animations are often used as well. 3
Based on the result , we will focusing on analysis the 3 figure above where is our output from the ANSYS. First and foremost we are using aluminum alloy with apply load of 1Mpa at the upper surface of the control box. The Equivalent of stress through the control cover box is shown in figure 1. The Equivalent stress occurs at the center of the control cover box as shown by turquoise color. The magnitude of the maximum equivalent stress is a range of 24.988 Mpa and below 49.846 Mpa , the average from the equivalent stress is 19.076 Mpa as stated in the ANSYS generate report .There are two major reasons for the maximum equivalent stress is occur at this center , first it is because the thickness of the plate at the center is less than the edge. Secondly due to stress concentration factor at the center. Figure 1 : Equivalent result
Figure 3 : Total deformation result 5 CONCLUSISON Control cover box has been selected as the laboratory report. In order to produce an appropriate design for the object, some assumptions are made for the object, in term of material type, boundary conditions and load values. From the assumption made, the largest displacement and the weakest point gathered from the Von Mises stress plot of the object were obtained. The meshing process are done for a few times with different element size. This procedure is done in order to obtain a more accurate result from the model. Finer mesh enables the ANSYS software to give out more accurate data. However, when the reduced element size mesh does not bring any huge difference in the values obtained , we can conclude that the value obtained is adequate enough for the model and that having more finer mesh will not bring any better result since the mesh independence has already been determined. Hence, through this report , the behaviour of the material for the control cover box has been predicted. From this lab, we find out that the total deformation of the
object will occur at the point where the load is applied and will have a value range between 2.881e-007 mm ~ 5.8879e-002 mm While the weakest point on the object can be determined by knowing the point where the maximum Von Mises stress occur, which on this object, it will range between 24.988 Mpa and below 49.846 Mpa 6
Project First Saved Tuesday, April 6, 2021 Last Saved Tuesday, April 6, 2021 Product Version 19.0 Release Save Project Before Solution No Save Project After Solution No Contents Units Model (A4)
o Geometry 1 o Coordinate Systems o Mesh o Static Structural (A5) Analysis Settings Loads Solution (A6) Solution Information Results Stress Tool Safety Factor Material Data o Aluminum Alloy Units TABLE 1 Unit System Metric (mm, kg, N, s, mV, mA) Degrees rad/s Celsius Angle Degrees Rotational Velocity rad/s Temperature Celsius Model (A4) Geometry TABLE 2 Model (A4) > Geometry Object Name Geometry State Fully Defined Definition Source C:\Users\Administrator\Desktop\Cap_fillets.stp Type Step Length Unit Meters Element Control Program Controlled Display Style Body Color Bounding Box Length X 80. mm Length Y 50. mm Length Z 20. mm Properties Volume 19819 mm³
Bounding Box Length X 80. mm Length Y 50. mm Length Z 20. mm Properties Volume 19819 mm³ Mass 5.4898e-002 kg Centroid X 39.992 mm Centroid Y 25.02 mm Centroid Z 4.9507 mm Moment of Inertia Ip1 16.424 kg·mm² Moment of Inertia Ip2 35.625 kg·mm² Moment of Inertia Ip3 49.241 kg·mm² Statistics Nodes 25006 Elements 13795 Mesh Metric None Coordinate Systems TABLE 4 Model (A4) > Coordinate Systems > Coordinate System Object Name Global Coordinate System State Fully Defined Definition Type Cartesian Coordinate System ID 0. Origin Origin X 0. mm Origin Y 0. mm Origin Z 0. mm Directional Vectors X Axis Data [ 1. 0. 0. ] Y Axis Data [ 0. 1. 0. ] Z Axis Data [ 0. 0. 1. ] Mesh TABLE 5 Model (A4) > Mesh Object Name Mesh State Solved Display Display Style Body Color Defaults Physics Preference Mechanical Relevance 0
Element Order Program Controlled Sizing Size Function Adaptive Relevance Center Coarse Element Size Default Mesh Defeaturing Yes Defeature Size Default Transition Fast Initial Size Seed Assembly Span Angle Center Coarse Bounding Box Diagonal 96.4370 mm Average Surface Area 103.240 mm² Minimum Edge Length 0.50 mm Quality Check Mesh Quality Yes, Errors Error Limits Standard Mechanical Target Quality Default (0.050000) Smoothing Medium Mesh Metric None Inflation Use Automatic Inflation None Inflation Option Smooth Transition Transition Ratio 0. Maximum Layers 5 Growth Rate 1. Inflation Algorithm Pre View Advanced Options No Advanced Number of CPUs for Parallel Part Meshing Program Controlled Straight Sided Elements No Number of Retries Default (4) Rigid Body Behavior Dimensionally Reduced Triangle Surface Mesher Program Controlled Topology Checking Yes Pinch Tolerance Please Define Generate Pinch on Refresh No Statistics Nodes 25006 Elements 13795 Static Structural (A5) TABLE 6 Model (A4) > Analysis Object Name Static Structural (A5) State Solved Definition
Future Analysis None Scratch Solver Files Directory Save MAPDL db No Contact Summary Program Controlled Delete Unneeded Files Yes Nonlinear Solution No Solver Units Active System Solver Unit System nmm TABLE 8 Model (A4) > Static Structural (A5) > Loads Object Name Pressure Frictionless Support Frictionless Support 2 Frictionless Support 3 State Fully Defined Scope Scoping Method Geometry Selection Geometry 17 Faces 4 Faces 8 Faces 1 Face Definition Type Pressure Frictionless Support Define By Normal To Applied By Surface Effect Magnitude
Solution (A6) TABLE 9 Model (A4) > Static Structural (A5) > Solution Object Name Solution (A6) State Solved Adaptive Mesh Refinement Max Refinement Loops 1. Refinement Depth 2. Information Status Done MAPDL Elapsed Time 43. s MAPDL Memory Used 342. MB MAPDL Result File Size 11.625 MB Post Processing Beam Section Results No On Demand Stress/Strain No TABLE 10 Model (A4) > Static Structural (A5) > Solution (A6) > Solution Information Object Name Solution Information State Solved Solution Information Solution Output Solver Output Newton-Raphson Residuals 0
Model (A4) > Static Structural (A5) > Solution (A6) > Total Deformation TABLE 12 Model (A4) > Static Structural (A5) > Solution (A6) > Total Deformation Time [s] Minimum [mm] Maximum [mm] Average [mm]
Model (A4) > Static Structural (A5) > Solution (A6) > Equivalent Stress Time [s] Minimum [MPa] Maximum [MPa] Average [MPa]
