Week - 5 - Modelling Spotwelds

Objective: Understanding the contact modelling by performing impact analysis on the crash tube. Procedure:  1)Mesh the given model with appropriate size, in this case the components were meshed with 6mm. Before proceding make sure the units system is properly given. 2) Assign part to each component individully. 3)…

  Python code:   import math import numpy as np import matplotlib.pyplot as plt   line_count = 1 crank = [] pressure = [] volume = []   for line in open('engine_data.out'):     if '#' not in line:         data = line.split()         crank.append(float(data[0]))…

1) popt means parameters optimised, arbitary constants of functions are optimised using curve fitting. For example: import numpy as np from scipy.optimize import curve_fit import matplotlib.pyplot as plt   # Example data x_data = np.array([1, 2, 3, 4, 5]) y_data = np.array([2.1, 4.1, 6.2, 8.2, 10.1])   def fit_curve(x,a,b,c):…

Objective: write a program that solve the given ODE. code: import math import numpy as np import matplotlib.pyplot as plt from scipy.integrate import odeint   def system(theta_init,time,b,g,l,m):     theta_1 = theta_init[0]     theta_2 = theta_init[1]     dtheta1_dt = theta_2    …

Objective: Write code that can solve an otto cycle and make plots for it. 1. Your code should create a PV diagram 2. You should output the thermal efficiency of the engine.   Syntax: import math import matplotlib.pyplot as plt   def engine_kinematics(bore,stroke,con_rod,cr,start_crank,end_crank):    …

Aim: Aluminium Tube is placed between one rigid wall and fixed at the bottom end. The moving rigid wall is made up of Steel material. Tube is assigned property of Aluminium non-linear alloy. Both the components are meshed appropriately and assigned proper contacts. Tube is having dimension 30mm diameter, 1 mm thickness…

Objective:A rigid ball impacting on a plate of Non-linear aluminium alloy of dimensions 100x100x5 mm is impacted with a ball of diameter 10 mm of steel material with a velocity of 50 m/s, 250 m/s and 500 m/s respectively. Mesh the model properly and assign the contact properties as required for development of the model.…

Aim: Study of cantilever beam with different cross_section: (circular, rectangular & I-section). Procedure: Maximum Deflection of the cantilever beam using analytical approach:     Max deflection = W*L^3/3*EI (mm) Numerical Approach: a)To perform analysis of static structures (load is constant w.r.t time);…

Aim:Simulate the component under different conditions and material cards. Observe the changes. Procedure: 1)Firstly, use the Law2 card which describe about elasto-plastic material. This card has many parameters, one of them is IXFEM, (this parameter talks abput the element deletion or crack propagation after the breaking)…

 Aim: Observe the effect of hourglass when the beam is deformed. Procedure: 1)Initially, simulate the beam model as Ishell=0, from the results it can be seen energy error is -13%, which means some energy is desipated and from the plots, the hourglass is not stabilized. (Hourglass effect is seen because of reduced…

1)Calculate the speed of sound in steel rail: Given- Density = 0.0078 (g/mm3), Young's Modulus = 210000 (MPa) Formula for speed of sound c = sqrt(E/RHO)  c = 5.1 e3 (mm/ms) 2) Given; l=1000 mm  Time taken for the shock wave t = d/c  t = 0.2 (ms) 3) Time for sound to travel length of rail = 0.2…

Aim: Create 2D meshing for the given components.  Procedure: 1)2D meshing means, extraction of midsurface, creating a mesh on the surface and assigning proper thickness to replicate the original component. 2)To extract the midsurface, the component must be a closed one. So all the free edges and yellow edges are eliminated.…

Aim: Perform the Brid strike simulation and arrange the file using *include keyword. Procedure: 1)Initially, the given .k file is opened in the LS-prepost. MAT card and SECTION cards are assigned to the parts. 2)Contact are created between the blades, hub and also between bird and the blades, using *contact_spotweld and…

Aim: Use mass scaling to reduce the runtime of a model and ensure the stability of mass scaling. The hard limit on mass scaling is 8% and stability should be completely intact. This means that two simulations, one with mass scaling and one without should behave exactly the same way. The submission should contain the trials…

 Aim: Using the manual (*CONSTRAINED_JOINT keyword) demonstrate spherical, revolute, cylindrical, and translational joints between two rigid bodies and two deformable bodies. Revolute Joint: Revolute joint also called a hinge joint has one degree of freedom. This joint has pure rotation motion along a common axis.…

Aim:Calculate the Mooney Rivlin and Ogden material constants and compare the both using stress-strain data from a Dogbone specimen tensile test with 100 percent strain for the given material data. Procedure: 1)To calculate the material contants, the given data has to be assigned to the material card. 2)Based on different…

Aim: Use the diagram of the true stress-strain curve of graphite iron casting. Two curves are there for different material structures. Students need to pick any one of them and use the data to create either a MAT_024 or MAT_018 material model and then validate it.  Procedure: In this problem, the experimental data…

Aim: Calculate the Stretch Ratio by comparing the ELFORM (-2, -1,1,2) with Ogden Material Model. Procedure: 1)Firstly, Cube with 10*10*10 is created using the Box command from the solid tool in the reference geometry group. Later a mesh with element size of 1 is applied to the cube using auto Mesher command in the element…

Aim: In this project, a children's headform model is provided. You are supposed to replicate a scenario where this headform will impact on a car bonnet. The bonnet should be considered as a rigidwall for the 1st case and while using the meshed hood model an elasto-plastic material card has to be used. From the simulation,…

Aim: Modelling Spotwelds using beam and solid elements by *MAT_SPOTWELD card. Procedure: 1)Create the beam element between the parts. The beam elements are created by using the element generation command in the element and mesh section. In element generation option we have three options: beam, shell and solid, we will…

Aim: Create the solver deck and perform the Carsh box simulation. Procedure: 1)Given, the keyword file extracted from the meshing.( Hypermesh) 2)First add a material to the part. So, using the 001_elastic in the MAT group, Rho=7.83e-3, E=2.07e5, PR=0.3. (Units: g, mm, ms) 3)Initially a Shell section thickness of 1.2mm…

Aim: Create the solver deck and perform the simulation of the phone falling on the ground vertically. Procedure: 1)Given the keyword file extracted from the meshing.( Hypermesh) 2)First add a material to the part. So, using the 001_elastic in the MAT group, Rho=7.83e-3, E=2.07e5, PR=0.3. (Units: g, mm, ms) 3)Shell section…

Report about Implicit and explicit methods: Explicit: a)No iterations b)Conditionally stable, CFL criteria. c)Need low Memory d)relatively smaller time steps e)Spatical derivative evaluated at n time interval   Implicit: a)Iteration occurs b)Needs high memoty c)Large time steps and may change due to nonlinearities…

Aim:Write the given measurements in the above different system of units. Also, mention the conversion factors. The assignment should show detailed calculation for conversion from SI unit to gm/mm/ms unit system Procedure: 1)Mass-1Kg=1000 gm 2)Length- 1m=1000 mm 3)Time-1sec=1000 ms 4)Force- F=Mass*Acceleration  …

Model-1: Aim: For the given MODEL 1, Create a Teramesh for Housing component with the given quality criteria. Procedure: 1)Initially geometry cleanup is performed to avoid the minimum size failures. 2)2D surface mesh is generated using the tria elements with average element size of 5 units. 3)The 3D tetra mesh is…

 AIm:   The objective of the project is to execute meshed side door component with proper mesh flow, following the quality criteria and finally assigning the thickness. Procedure: 1)The given geometry model is as follows:  2) Generating a midsurface using automidsurface option cant be proper, because…

AIM: To perform meshing on the given pillar model with the following quality criteria. PROCEDURE: 1)Firstly, the geometry clean up is performed to remove if any red and yellow edges on the component. 2)Now, midsurface is ectracted using the automidsurface command 3) 2D meshing can be perform on the midsurface. Part by…

Aim: The given component has to be meshed using the hypermesh with the following quality criteria. Procedure: 1)Initially, the geometry cleanup is to be performed. To extract the midsurface of the geometry it should be a closed component, so it must be free from red edges (free edges) and yellow edges( more than two surface…

Aim:The backdoor meshing has to be done, following the quality criteria. Procedure: 1)Backdoor contains three components, so the given geometry seperated and assigned three components seperatly. 2)Geometrical checks are performed. Only the green lines has to exist, because it represents closed component. For a midsurface…

Aim: Inner hood panel has to be meshed with the given quality criteria and assiging the thickness value to the property. Procedure: 1)Firstly, the autoclean up command is used to aviod unwanted errors is any. 2)Later on, midsurface is extracted using the auto midsurface by selecting the offset option during extraction.…

Aim: Mesh the given component with size of 5 units and create 1D elemets on the following component with given cross-section and DOF. Procedure: 1)Firstly, import the geometry model using import geometry command. 2)To understand the 3D component, 2D mid -surface has to be created and meshing of the mid-surface is to be…

AIM:   The aim of the challenge is to deploy connections to the FE model using DECK (NASTRAN) module. Procedure: 1) Initially, the preprocesssor for structural analysis was started with, extracting the mid-surface for the individual components (Sheet metal and plastic components). Post which, meshing was applied to…

Aim:   The given instrumental panel has to be meshed with the given quality criteria. Procedure: 1)A length of 1mm is assigned for proper cons resolution and geometrical checks is performed. 2)After correcting the geometrical errors, random thickness measurments are done to the component at different positions.…

Aim:   The solid meshing is to performed for the given rear view component, geometrical errors and meshing the surface with the 2D element quality criteria. Procedure: 1)Solid meshing is to be done on the part which has no thickness (i.e, hollow parts) or if the component has a thickness value greater than 5mm. 2)Assigning…

Objective:   Meshing for the symmetry Bottle cap has to be generated with good quality criteria. Cad model: Procedure: 1)Initially, for proper cons resolution an element length of 1mm is provided, after which a topo operation is performed. 2)Geometry checks has to be performed, so that the design model is ready…

Objective:  Create proper mesh for the floor panel model following the quality criteria parameters. Cad model: Procedure: 1)Target length of 5mm is assignbed to the model and performed the topo operation on the complete model.   2)Firstly, geometry checks are done so that the geometry is good with zero errors…

Objective: Generate the Mesh for the given CCB CAD model,by following proper procedure like, Check for the Geometry errors, take the mid surface, perform gepmetry cleanup and implement 2D element Quality criteria to the mesh model.  Cad Model: The following design model has to be checked for geometry errors, create…

Objective: Generate a mesh on the given Hood model using ANSA tool and also check the quality criteria for the given parameters. Cad Model: Procedure: 1. Firstly, import the design model into ansa. Understand the geometry and perform geometry checks.     Tools>>Checks>>>Geometry  So, the geometry…