Consistency of Units

Objective: In this report, I will clean up geometry and generate shell and volume mesh for a Turbocharger model.   Procedure: Step 1: Delete unnecessary geometries, create coons faces, deleting all single cons, deleting interior faces due to intersections:   Step 2: Rename PID and set PID for appropriate geometries:…

Objective: In this report, I will compare the results from explicit and implicit methods analyzing a simple bar in tension. Suppose that the force in the bar is a nonlinear function of the displacement: `f(u)=u^3+9u^2+4u` It then follows that the stiffness of the bar is: `(u)=df/du=3u^2+18u+4`   Explicit Analysis:…

Objective: In this report, I will conduct a simulation in which a crash box impacts a rigid wall. Model Setup: The unit system used is g/mm/ms. 1. Rigid Wall: Rigid Wall Planar is created at one end of the crash box. 2. Boundary SPC is set up for the crash box to move translationally only in the x axis. 3. Material: -…

Objective: In this Report, I will answer some theoretical questions and conduct 3D meshing for some models.   Answers: 1. To calculate the speed of sound traveled in steel rail, we should first have the steel Young\'s Modulus and density: `E=210000 MPa` `ρ=0.0078 g⁄〖mm〗^3` Therefore, speed of sound in steel…

Objective:  In this Report, I will conduct the Geometry Cleanup for 3 CAD models: Practice Clip Repair Mounting Bracket The purpose of Geometry Cleanup is: Refine the Geometry Create reasonable mesh Assign proper thickness The procedure is as follows: Step 1: Import CAD model. Step 2: Clean the geometry: delete bad…

Objective: In this report, I will conduct calculations on converting units from SI to other unit systems.   Detailed calculation for conversion from SI (kg/m/s) unit to g/mm/ms unit system: Mass: 1kg = 1000g   Length: 1m = 1000mm   Time: 1s = 1000ms   Force: `1 N = 1 (kg×m)/s^2 = 1 (g×mm)/〖ms〗^2`…

Objective: In this report, I will run 7 simulations and compare the cases of different material parameters. The 7 cases are: Law2_epsmax_failure: an isotropic elasto-plastic material using the Johnson-Cook material model with a defined maximum plastic strain and Johnson failure option without Xfem formulation. Law2_epsmax_crack:…

Objective: In this project, I will run a side crash simulation of a Chrysler Neon BIW model. A cylindrical rigid wall with a diameter of 150 mm is placed next to the left B-Pillar of the BIW and the initial velocity of the BIW is set to be 35 mph = 15.56 m/s. In this simulation, the pre-processing is carried out by HyperMesh…

Objective: In this project, I will run a frontal crash simulation of a Chrysler Neon BIW model. A rigid wall is placed in front of the BIW and the intial veloctity is set to be 35 mph = 15.56 m/s. In this simulation, the pre-processing is carried out by HyperMesh and HyperCrash. After that, the nonlinear explicit dynamic…

Objective: In this report, I will conduct a head impact simulation. To assess the safety of a child head after impact, the HIC and acceleration values need to be taken care of. A high value of HIC indicates a more probability to more injury.   There are 3 cases in this simulation: Case 1: A Simple Head Impacting a…

Objective: In this report, I will conduct a simulation in which a crash box with spotweld impacts a rigid wall. The influence of spotweld will be analyzed using beam elements and solid elements. Model Setup for Beam Spotweld Case: The unit system used is g/mm/ms. 1. Rigid Wall: Rigid Wall Planar is created at one end of…

Objective: In this report, I will conduct a drop test simulation of a cellphone against a steel made plate. Model Setup: The unit system used is g/mm/ms. 1. Material: - 001-ELASTIC for the cellphone: Mass is chosen to be 174 grams --> density is 0.0015820 g/mm^3. Young\'s Modulus is chosen to be 30000 MPa. Poission…

Objective: In this report, I will mesh a bumper assembly and run 6 crash tube simulations and compare the cases of different interface settings and different notch positions. Bumper Meshing: The bumper is meshed with an average mesh size of 6 mm: In this meshing part, I mesh face by face and confirm whether the mesh flow…

Objective: In this report, I will conduct 2 simulations to compare the results of using different shell element properties. With the model of crash beam from the previous assignment, I will do the followings: 1. Change the run time to 55 ms. 2. Change the number of animation steps (frames) to a minimum of 25 and a maximum…