Finite

In the last post(76_Topology Optimization using Optistruct), I attempted a compliance minimization topology optimization problem in Optistruct. I wanted to compare it with Sigmund's paper, so I tried a simple setup, but it was difficult to make an accurate comparision, and more importantly, the results were not sarisfactory to me. The biggest advantage of using commercial software for optimizati..

In the last post(75_A 99 line topology optimization code written in Matlab), I wrote a review about paper on topolgy optimization using MATLAB. Today, I will proceed with topology optimization in Optistruct, setting the boundary conditions and constraints identically to those presented in the MATLAB code from that paper. The code feature in the paper is commonly referred to as the "99line". In t..

In this post, I'll conduct a crash analysis of the mid rail using HyperCrash. Model - Material Piecewise linear RHO_I(Initial density) : 7.85e-6 E(Young's modulus) : 206 Nu(Poisson's ratio) : 0.3 Model - Property Shell Thick(shell thickness) : 1.6 Contact interface Stfac(Scale factor for stiffness) : 1 Gapmin(Min. gap for impact activ) : 0.9 Fric(Coulomb friction) : 0.2 Control Card RUN_NAME_NUM..

Continuing from the last post, in this post, I'll analyze the fluid structure coupling example and look at the results. In HyperCrash, load the .rad file. Part It consists of a tank container and meshes for air and water. Property Since hourglass was explained in the previous post(12_S-Beam Crash),I won't go into detail here and will focus only on setting the parameters. Tank container hm(Shell ..

In this post, I will execute the "fluid structure coupling" example found in the RADIOSS guide. The description in the guide is as follows. Solshing inside a fuel tank by simulating the fluid structure coupling. The tank deformation is achieved by appling an impsed velocity on the left corners. Water and air inside the tank are modeled with the ALE formulation. The tank container is described us..

In the previous post, I talked about part and property. Today, I explain to other part in pendulums example Material Just one material for this example. Model - Material Create New - Elastic and Hyperelastic - Linear elastic (1) In reality, for most materials density does not change, but in simulations, we sometimes need to simulate special environments such as high temperature or high pressure,..

There are a lot of interesting examples in the RADIOSS example, so I'll be working through them for a while. In this post, I'll going to perform a Pendulums example. There was also an example file in HyperMesh's installation path. However, due to the different versions, the example in the previous post was slightly different. In this example, we're dealing with a gravitational contact with no lo..

In previous post, I post S-beam crash from the RADIOSS guide but I think lack in this case study, so I'll execute this S-beam crash case. In guide, write this simulation iteration information First, hourglass is described in the radioss guide as follows. Hourglass modes are element distortions that have zero strain energy. The 4 node shell element has 12 translational modes, in this modes has 3 ..

In this post, I will perform an S-Beam Crash, an example from the RADIOSS guide. The description of RADIOSS is as follows An S-beam is crushed at an initial rate of 5 m/s against a rigid wall. The section is an empty square-shaped tube (each side measuring 80 mm). The thickness is 1.5 mm. The tube is made of steel, and plasticity is considered, but not failure. Material Properties Young's modulu..

Impact analysis or crash analysis is the process of studying the response of an object or structure to a collision or impact. Understand and predict the forces, deformations, and extent of damage that occur during a collision with impact analysis. Evaluate the accuracy of the results by comparing the Impact analysis with the actual crash experiment. Why do we need conflict resolution? 1.Ensure s..