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Aim: The objective of this experiment is to simulate the crash test of a crash box and record the stress, strain and all the energies Explanation: Case setup/ Deck Setup (Keywords): gm,ms,mm Unit system The keywords created are mentioned below. Section- SECTION_SHELL Shell section is created using the above-mentioned key…
Praveen G V
updated on 24 May 2021
Aim:
The objective of this experiment is to simulate the crash test of a crash box and record the stress, strain and all the energies
Explanation:
Case setup/ Deck Setup (Keywords): gm,ms,mm Unit system
The keywords created are mentioned below.
Shell section is created using the above-mentioned key words and selectively reduced shell elements are used as they are economical from a computation perspective.
Two materials are used here.
One is for steel (Elastic MAT01) and other is for steel (Piecewise Non Linear MAT24) assigned to the crash tube
The created section ID and Material ID are then entered in PART card.
4. Rigid wall- RIGIDWALL_PLANAR
5. Contact - CONTACT_AUTOMATIC_SINGLE_SURFACE, CONTACT_FORCE_TRANSDUCER_PENALTY
Force transducer penalty card is used because in case of single surface contacts, net contact force is zero and hence LS-Dyna doesn't write any data in the rcforc output file. Hence for single surface contacts, an additional force transducer penalty card is used to record data.
6. Load- INITIAL_VELOCITY_NODE
8. Database- DATABASE_ASCII and DATABASE_BINARY_D3PLOT
Animation:
Since initial velocity is used for a part of considerable less mass with low velocity instead of prescribed motion, the tube crashes on the rigid wall and bounces off instead of crumbling and coming into self contact.
Plots & Contours:
Cross-sectional force:
Since this is an impact simulation where a moving crash tube of less mass hits a rigid wall, the output will show fluctuating forces.
Acceleration plot of a node in the middle(Node ID 5130) of the crashbox:
Maximum directional stress and strain along the length of the crashbox (X strain, Y strain, Z strain):
X Stress:
Y Stress:
Z Stress:
Directional elastic strain:
X Strain:
Y Strain:
Z Strain:
Energy Plots: Unit - N-mm
Comparison of acceleration and Stress/strain plots: Unit- Mpa
Von-mises Stress( 1.2 mm)
Von-mises Stress( 1.5 mm)
In both the cases, von mises stress is more or less the same except, in both the cases, different elements have the maximum stress.
Acceleration plot (1.2 mm):
Acceleration plot (1.5 mm):
Comparison of acceleration plot:
Due to the additional mass, the acceleretion has also changed a little.
Result:
Crash test of a crash box was successfully simulated and the contours and plots were presented
Conclusion:
The given meshed model was successfully used to build a LS-Dyna keyword deck and the Crash test of a crash box was successfully simulated with normal termination.
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Week - 4 - Crash Box Simulation
Aim: The objective of this experiment is to simulate the crash test of a crash box and record the stress, strain and all the energies Explanation: Case setup/ Deck Setup (Keywords): gm,ms,mm Unit system The keywords created are mentioned below. Section- SECTION_SHELL Shell section is created using the above-mentioned key…
24 May 2021 08:05 AM IST
Week - 3 Drop test Challenge
Objective/Aim: The objective of this assignment is to prepare/build a complete LS-Dyna deck for drop test of a mobile phone from scratch using just the finite element model of the mobile phone and the drop surface. Explanation: Case setup/ Deck Setup (Keywords): mm,ms,Kg,KN Unit system The keywords created are mentioned…
17 Feb 2021 11:18 AM IST
Frontal Crash Simulation – BIW
Frontal Crash Simulation – BIW Objective: The objective of this project is to simulate frontal crash of a car’s BIW model and obtain the requested forces, acceleration and deformations experienced by the model. Case Setup: Model setup 1. The model checker is run in hypercrash immediately after importing…
09 Sep 2020 03:53 PM IST
FMVSS 216 Roof Crush Test
FMVSS 216 Roof Crush Test Objective: The objective of this project is to simulate the FMVSS 216 Roof Crush Test and determine whether the given BIW frame is in compliance with FMVSS 216 Guidelines. Case Setup and Model Setup: 1. First, the BIW model is imported in hypercrash. 2. Then, the FMVSS impactor is imported…
25 Aug 2020 07:15 AM IST
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