Assignment 6

Aim: To validate the material model with a dogbone specimen Case setup: We are going to use mm, ms, g units. The given Material curve image (True stress vs strain %) is digitized using a software and the data is copied to excel. Stress and strain units are in ksi and % respectively. Stress units are converted to MPa and…

Aim: To understand mass scaling parameters and to compare Implcit and explicit runtime with hardlimit on mass scaling (8%) Case setup: These are the keywords already present in the LS Dyna file. CONTROL_TIMESTEP card is used. DT2MS and TSSFAC are set at -3.5e-5 and 0.9 respectively. Negative TSSFAC brings all the nodes…

Aim: To perform head Impact simulation and calculate HIC values for 3 cases Simple Head with rigid wall Headform rotated with rigid wall Headform rotated with meshed Hood Case setup: There are 3 files provided  in the model - Simple head, headform and meshed Hood. These files should not be edited and should be included…

Aim:  To compare various ELFORMS against the Uniaxial Plot given and the Stress/strain developed in the uniaxial tension test  Explanation: The given material card is opened into the LS PrePost application. To develop Solid Cube mesh, go to Mesh -> ShapeMesh -> Provide values such that a cube of 10x10x10…

Aim: To model spotweld for the given assembly using beam and solids and to analyse the differences in the crash test result Explanation: Spotwelds can be modelled using 4 methods Beam element and Tied contact Solid element and spotweld contact Using constrained spotweld Using constrained generalized We will be using the…

Question: 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 but in this case…

Question: In this assignment, we provide you with a file having just nodes and elements of two parts, a simplified cellphone and a plate mimicking ground. You need to create a complete simulation file from this to perform a drop test. *INITIAL_VELOCITY card is to be used to give velocity specifications for the cellphone.…

Aim: To give detailed report about Explicit and Implicit methods and to solve F(u)=u3+9u2+4u using both Explicit and Implicit methods (with a tolerance of 10-2)   Explicit and Implicit Method: Implicit and Explicit analysis differ in the approach to time incrementation. In Implicit analysis each time increment has…

Aim:  To convert measurements in one system of units to another and explain the detailed conversion for SI to gm/mm/ms unit.     Conversion Table:   Mass Length Time Force Stress Energy Density Young's modulus Velocity Gravity   1Kg 1m 1s 1N 1Pa 1Nm 1Kg/m3 210 Gpa 56.33Kmph 9.8m/s2 Conversion…

Objective:  To mesh the given Door component using given Quality criteria and assign thickness   Target Element Length = 4mm S.N Quality Criteria  Value  1 Aspect Ratio  5 2 Skewness 45 3 Warping 15 4 Taper      0.5 5 Min. Length 2mm 6 Max. Length 6mm 7 Min angle Quad 45 8 Max angle…

  Objective:  To create connectors and attach various parts of the given model Right_Rail_2 & Front_truss_1:- Seam-Quad(angled+capped+L) Left_Rail_2 & Front_truss_1:- Quad elements Front_truss_2, Front_truss_1 & Right_Rail_1:- Spot weld with 3 Layers and 5 mm Diameter Front_truss_2, Front_truss_1…

Objective:  To generate 3D mesh on the given components and should pass all the given quality parameters.   Procedure and result Geometry cleanup The given 3D CAD models are imported into Hypermesh. To separate the components from the assembly. We can use Tool-> Organize -> surfaces (select attached and…

Objective:  To mesh the given Hood component using given Quality criteria and assign thickness   Target Element Length = 5mm S.N Quality Criteria  Value  1 Aspect Ratio  5 2 Skewness 45 3 Warping 15 4 Taper      0.5 5 Min. Length 2mm 6 Max. Length 8mm 7 Min angle Quad 45 8 Max angle…

Objective:  To create 1D elements on the bracket with given cross section and DOF   Case setup and execution:  Mesh generation 2D->Automesh is used to mesh the geometry. Min element size is set as 2mm, Max element size as 7mm and Target element size is 5mm. Only Quads option is used to generate mesh.…

Side Crash Analysis of BIW Objective: To perform Side crash analysis on BIW and obtain output requests at the following sections: Sectional force in the cross member Intrusions at B pillar, hinge pillar and fuel tank region and countermeasures Peak velocity of inner node of the door 337773 Case setup and execution: The…

Frontal Crash Analysis of BIW Objective: To perform Frontal crash analysis on BIW and obtain output requests at the following sections: Sectional force in the rails at location of indicated node 174247. Axial force received on the rails from bumper. Shotgun cross sectional forces. A pillar cross section. Acceleration curve…

Objective: To create mesh for bumper assembly with target mesh size of 6mm To compare forces and energies in the crash result obtained from altering properties of contact interfaces of crush tube Case setup and execution: Bumper assembly meshing The assembly is checked for geometry errors by selecting mixed from Geometry…

Objective: To compare 7 material cases and analyse the models for rupture Case setup and execution: The models are imported into Hypermesh and properties of the model are changed according to the question and analysed Case 1: Run as it is Case 2: Change Ifail_sh=1, Dadv=1, Ixfem=1 in /FAIL/Hohnson Case 3: Delete /FAIL/JOHNSON…

Objective: To compare simulation results of a crash beam (base property and modified property) Case setup and Execution: The engine RAD file is opened, and following changes are made: The runtime is changed to 55ms. Animation DT is changed to 1.375 in order to have 40 animation steps. The starter rad file is imported into…

1. Check the material properties of the rail component and calculate the speed of sound in steel rail Ans: c=sqrt(E/ρ) = sqrt(21x1010/0.0078)=sqrt(21x1010/0.0078)=105xsqrt(2692.3)=51.88x105mm/s or 5188m/s   2. The length of the rail is about 1000 mm.calculate the time takes for a shock wave to travel…

Objective:                  To clean geometry from irregularities and to extract and mesh the mid surface with optimum element size   Case setup and execution:                 …