Week - 9 Material modeling from raw data

Objective: To analyze and compare different cases with various contact types and different parameters as well as notch positions and compare the results for the same boundary conditions. Given model is a crash tube with hollow square configuration meshed with all Quad QEPH 24 shell elements. Two halves of the tube are…

Project – 1 CHT Analysis on a Graphics Card. Objective: To perform Conjugate Heat transfer Analysis on a graphics card which consists 1.GPU which is the only heat source and is in contact with the 2.cooling fins which loose the heat to incoming air stream via convection, 3.other electronics components and a PCB on…

Objective: To analyse and compare results for different types of materials/material properties with the same boundary conditions. #The results are discussed in ppt attched   Case 1:Law 2-M2_Plas_Johns_Zeril – Elasto-plastic: In this case the material is considered to be an elasto-plastic with input parameters…

Objective: To perform side impact analysis on a BIW model minimised as per the Euro NCAP standards for velocity, positioning and dimensions   The Setup: A 10 Inches thick pole is used as a rigid wall, impact occurs with the BIW model travelling at 32Km/hr or 8.9mm/ms such that the horizontal centreline of the model…

## Comments by grader Hi Sandesh, good to see your submission.    Objective: To mesh and edit given geometries and engine files as per conditions provided.   Question 1:Find the speed of sound in the steel rail component. Answer: Speed of sound in a material in this case AISI 1018 Steel considering 1 DOF…

Objective: To compare Results for shell element with base and improved element properties for the same inputs. Case 1: Impact analysis of crumble box with a rigid wall at Initial velocity of 15.6 m/s. The element formulations are kept to default values. Analysis end time of 55 milliseconds. Case 2:Impact analysis of the…

Objective: To perform a Front Impact analysis of non-linear explicit nature on a partial BIW model to study how the impact forces are distributed through the structure to prevent damage to the occupants.   Analysis Setup: A Partial BIW model is checked for necessary inputs with recommended parameters. Contact interfaces…

    Objective: To clean the given geometries and apply 2D meshing as per required criteria for element length.  Steps Followed: The .hm files containing the models were imported in hyperworks (Optistruct profile). The model is made sure to have a closed volume for 'midsurface' option to use. Toggle edge…

Introduction to 2DOF transient handling model:     The cornering behaviour of vehicle is termed as handling. 'Handling' implies the responsiveness of a vehicle to driver input or the ease of control. It is essentially a measure of a vehicle-driver combination meaning that the driver observes the vehicle direction…

A car has a weight of 1900 lb front axle and 1552 lb on the rear with a wheelbase of 100.6 inches. The tires have the following cornering stiffness values Determine the following: (2 points each except for the first question)  Ackermann steer angles for 500, 200 and 50 ft radius(3 points) Under-steer gradient Characteristic…

Aim: Development of chassis for given targets and constraints of a Light-weight sports vehicle for optimum handling and feel. Objective: To select anti-roll bars, and prepare Under-steer budget sheet by determining the contribution of each of the target components, for given vehicle level targets and making sure…

Aim: To understand and demonstrate how different types of joints can be simulated using rigid and deformable bodies in LS Dyna.   Simulation setup: There are various types of joints which can be simulated in LS Dyna for demonstration purposes as well as FEA analysis where stresses are induced due to motion. Most common…

 Bird Strike Analysis: Aim: To understand and demonstrate a bird strike analysis and the use of ‘Include’ keyword for a professional and structured approach. Objectives: Simulate a bird strike situation using given models with appropriate material models as required. Establish a numbering system for the…

 Pedestrian Head impact Analysis according to Euro NCAP regulations: EC 78/2009 Objective: To study pedestrian head impact by simulating it using a given child headform model for the impact analysis as per Euro NCAP standards for impact velocity and positioning of the headform model as well as the hood model to get…

 Hyper-elastic material modelling and validation usin un-axial tensile test simulation: Aim: To build a material model for a hyper-elastic material using data gathered from experimental tensile test and compare the results for a simulation of a tensile test using a dog-bone specimen model with the actual experimental…

Material Modelling and Validation exercise: 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.  Use a data…

Objective: To study and understand ‘mass scaling’ technique used in explicit analysis and how it affects the time-step and overall simulation time for a given analysis using trial and error method.   Analysis Setup: In an explicit dynamic analysis, the time step is computed using the stress wave propagation…

Create a block of 10mmx10mmx10mm dimension with 10 elements for each direction and use the material card attached (Ogden_Material.k) that is representative of the material properties from the above figure. Use appropriate boundary conditions to simulate tensile behavior for the model and finally compare the results…

  Spot-welds Simulation and study:    Objective: To study and simulate how a spot-weld joint is formed and used in a crash analysis by comparing results for a solid element spot-welded crush box with a beam element spot-welded crush box. Analysis Setup: Spot-weld joints:  Used to model a spot-welded…

Crash box impact analysis: In this assignment, the student needs to simulate a crash test for a crash box for which mesh is given. A crash box is a highly energy absorbing structure that crashes on application of loads and reduces impact on other components nearby. A full-fledges crashbox is a highly sophisticated design…

Drop test analysis:   Aim: To perform a drop test analysis on a given model of a cell-phone using LS-Dyna to study and understand how to setup an analysis case and assess the results.   Analysis Setup: Drop test: Drop testing is one of the impact tests a manufacturer performs as a set of torture test for a mass…

Explicit and Implicit Analysis:   Aim: To use implicit and explicit analysis methods numerically to solve a simple problem for better understanding and drawing conclusion for which method is better in what case.   Solution: Both Implicit and explicit methods are widely used for numerical analysis such as in FEA.…

Unit Consistency challenge: Aim: To practice unit consistency and make a chart of different unit system used in CAE applications showing relation between them.   In CAE there are various applications for FEA and as per the scale of components the unit system should be adaptable. For instance the unit system for crashworthiness…

  Questions: Take a look at the data analysis video before you attempt this challenge. Your task is to write a script that does the following. NOTE: such scripts are quite commonly used in companies for data analysis Link to data file Data visualizer (100 points) Your script should take column numbers as the…

Questions: What does popt and pcov mean? (Watch the video to get some context) Curve fit option works by taking a polynomial function with constants/arguments, and the input data points as ‘x-data’ and ‘y-data’, then it calculates the optimum values for the constants/arguments using ‘popt’…

Question: Write a program in Python that will simulate the pendulum motion, just like the one shown in the start of this challenge. Use, L=1 metre, m=1 kg, b=0.05. g=9.81 m/s2. Simulate the motion between 0-20 sec, for angular displacement=0, angular velocity=3 rad/sec at time t=0. When you do this you will get the position…

Question: Based on the concepts you have learnt during the forward kinematics routine, go ahead and write code that can solve an Otto cycle and make plots for it. Here are the requirements Your code should create a PV diagram You should output the thermal efficiency of the engine.   Objective: To write a python program…

Sprung Mass [Ws]   Lbs 4500 Kg 2043 Newtons 20041.83 Rolling moment by Ws (lateral component)   ft-lb 7241.25 Nmm/g 1002038 Nmm 9829997 Total front roll stiffness [Kφf] ft-lb/deg 1300 Nm/deg 1738.697 Nmm/deg 1736959 Total rear roll stiffness [Kφr] ft-lb/deg 1100 Nm/deg 1471.205 Nmm/deg 1471205 Total roll…

Total weight   lbs 3750   Kg 1702.5 Newtons 16462.61 F/R ratio   55% front 2062.5   Kg 936.375 Newtons 9054.437 Weight Rear      1687.5   Kg 766.125 Newtons 7408.176 Wheelbase   Inches 98   mm 2489.2     C.G. Height   In. 17   mm 431.8 0.173469  …

Combustion simulation of a Methane-Air mixture: Objectives: 1.To perform a combustion simulation using the given inputs on a combustor model using axi-symmetric condition for a steady state analysis to study and understand how chemical kinetics and combustion modelling works. 2.To measure the mass fraction of various chemical…

Cyclone efficiency empirical models: 2. Iozia and Leith Model: Developed based on force balance this model assumes the influence of 2 forces on the particle while its carried by the vortex- Centrifugal force and flow resistance. The collection efficiency ηi is given by: ηi= 1/1 + (dpc/dpi)^β where,…

Parametric Study of a Gate Valve: Objective: To perform a steady state analysis on a gate valve assembly and do a parametric study for mass flow rate from the pipe at various valve lifts. To compare the results acquired via parametric method with the results acquired by individual simulations.     Geometric Setup:…

Gearbox sloshing effect challenge: Objectives:  To simulate the sloshing of a fluid in this case the lubricant inside a gearbox casing due to the motion of a pair of gears.  To understand and implement the Dynamic Meshing option ad optimise it for accurate result. To use the UDF – User defined function…

Rayleigh Taylor Instability Simulation: Objective: To perform Rayleigh Taylor Instability error simulation to understand the phenomenon, and analyse the effects of different meshes on its representation, find the significance of Atwood Number and the practical applications in CFD modelling. 1. The mathematical analysis…

Conjugate Heat Transfer Analysis Objective: To perform conjugate heat transfer analysis by simulating hot exhaust gas flow through the exhaust manifold placed in free air at room temperature.   Conjugate Heat Transfer: 1.Conjugate Heat transfer is the transfer of Heat energy at the interfaces of solid and fluids.…

Challenge 3 – Ahmed Body Objective: To perform Grid dependancy test on a given model of Ahmed body and analyse the results to understand its importance and use. 1.Ahmed Body and its Importance: Ahmed body can be defined as a device or a dummy which is a representative of a standard passenger car for validation of…

  Elastic section modulus:  It is a geometric property of a particular cross-section and is essential in the design of beams and flexural members. The minimum elastic section modulus is often considered while designing for safety. As given the Elastic Section Modulus (S) is calculated as : S = I/y I - Area Moment…

  Design consideration for a fender:                Fender or Quarter panel of a car is a BIW component of a car. Its purpose is to keep the engine bay or engine compartment protected from the debris and foreign materials such as dust, rain, sand,…

Roof Design Challenge: Objectives: Perform Curvature study to figure out appropriate position for the roof bows using Heat distortion criteria Perform Section modulus study for Front roof rail, Rear roof rail, Roof reinforcement, Bow roofs. Write a detailed report on the same. Roof Design:               …

Answers: 1. The starter file is in the form of \'name_0000.rad\' and usually contains all the defined information about the model. It consists of the unit system material and properties of each of the components, contact interfaces, boundary conditions, added mass etc. As name suggests, it contains all the data to start…

Backdoor Design: Objective: To design an inner panel of a backdoor from the given outer panel geometry.                Back Door also called as ‘Hatch’, or ‘Tailgate’, ‘Trunk-lid’, ‘Boot-door’ is basically…

European standards for Fender Design:     The wheel Arch area of the fender is usually designed as a cover or sheild over the tyre along its perimeter to stop any debris or stones , dirt, sand, snow etc. from getting thrown into the vehicle/ BIW area as well as outside the vehicle and onto other vehicles…

Design of hood or bonnet: A hood or bonnet of a car/vehicle is one of the most important parts in designing BIW. It is designed as a closure to the engine compartment but has many other jobs. A hood provides protection and easy access to the engine compartment components such as radiator, engine, battery, alternator and…

Under Body  Coating (UBC): What:                               Under body coating is a type of automotive coatings like paint, primer protective coatings, etc. Often neglected…