Week - 4 - Crash Box Simulation

Aim : Explanation: Introduction to Bird strike simulation and its significance Bird strikes are a major threat to aircraft structures, as a collision with a bird during flight can lead to serious structural damage. Computational methods have been used for more than 30 years for the bird-proof design of such structures,…

Joint Creation and Demonstration in LS DYNA: A joint is a section or sub-assembly used to connect two parts (linkages) with a relative motion between the connected parts. The joint can either be a fully constrained and partial constrained i.e free movement. The demonstration presented here comprises of creation and working…

Aim : To simulate a tensile test by calculating 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. Explanation : Mooney Rivlin and Ogden material models are used to represent the hyperelastic materials. Hyperelastic…

AIM: Material modelling of graphite iron casting from the experimental stress strain curve EXPLANATION: The experimental data values recorded from the experiment are plotted in the figure shown below. Material modelling and subsequent simulation have been carried using the curve no. 2. Young’s modulus: The data…

Aim: To determine effects of mass scaling on run time of the simulation Explanation: Explicit method is one of the ways to solve a partial differential equation. An Explicit FEM analysis does the incremental procedure and at the end of each increment updates the stiffness matrix based on geometry changes (if applicable)…

PROJECT: Pedestrain Head Impact Aim: To simulate the impact of headform on an automobile hood and hence calculate head impact coefficient. Input: A simple sphere with shell elements has been provided to replicate the headform. Children’s head form Meshed hood Units : kg-mm-ms-kN Case i): Impact simulation of…

Aim : To simulate tensile behaviour for the model (10x10x10 mm3) solid elements and compare among different element formulation of a hyperelastic material Ogden. Explaination: Stretch ratio is defined as the ratio of final length to the initial length of a component. Since the initial length is 10 mm and the…

Aim : To model spotwelds for the given assembly of parts and run a crash test. Explanation: Physics : The spotwelds in Finite element analysis can be modelled as i) beam element ii) solid element with different element formulation. In the current test scenario the plates are spot weld at six points in transverse…

Aim : To simulate a crash test for a crash box. Explanation: Physics : A crash box is a highly energy absorbing structure that crashes on application of loads and reduces impact on other components nearby. In the given problem, the crash box made of steel material with an initial velocity of 50 kmph crashes into a rigid…

Aim : To create the input file to simulate the cellphone drop test. Explanation: Physics : Understanding the problem and isolating the system: The cellphone is dropped from, at some distance vertically in the downward direction with some intial velocity. Deciding system under consideration (mobile phone being dropped)…

REPORT ABOUT IMPLICIT AND EXPLICIT METHODS: The finite element method is a popular computational tool used in engineering research and industrial design. In the field of solid mechanics, and specifically non-linear quasi-static problems, finite element equation solution methods can generally be classed as either implicit…

CHALLENGE 1: For conversion from SI unit to gm/mm/ms unit system: The SI unit is represented by mass in 'kg', length in 'm' and time in 's'. Other quantities are calculated/derived from the fundamental quantities. Given in the problem are: Mass                          …