# Getting Started

Let us compute the simplest finite element simulation to demonstrate how the femCalc works. Every simulation in femCalc is defined by a script. Let us demonstrate the script on a simple example guiding you step by step.

### 1) Geometry

Let us consider a cantilever with rectangle cross-section fixed on one end and loaded by pressure on the opposite end. The cantilever length in $x$-direction is $2$ meters, the width $y$-direction is $0.1$ meters and the height $z$-direction is $0.2$ meters. The geometry is defined by command

BLOCK, 1, 2, 0.1, 0.2

### 2) Material

is consider the hyperelastic Neo-Hookean with properties close to steel, defined by shear modulus $\mu =80GPa$ and bulk modulus $\kappa =200GPa$

MAT, 1, NEOHOOK, 80E9, 200E9

### 3) Boundary Conditions

Let us fix the structure on the surface 1, which is the left one of the two surfaces in direction of global $x$-axis

DA, 1, 1, ALL, ALL

The second parameter fixes rotational dof's (degrees of freedom), whereas the first one fixes translational dof's.

### 4) Loading

Let us load the cantilever on surface 2, which is the right one of the two surfaces in direction of global $x$-axis by negative pressure $-480MPa$

SFA, 1, 2, -480E6

### 5) Element Type

The cantilever is going to be build of the linear brick BRICK24 elements.

ET, BRICK24

### 6) Mesh

The number of elements is $10$ in the cantilever direction, in the other directions let us set the number at $2$.

MESH, 1, 10, 2, 2

### 7) Final Script

The final script looks as follows:

BLOCK, 1, 2, 0.1, 0.2 MAT, 1, NEOHOOK, 80E9, 200E9 DA, 1, 1, ALL, ALL SFA, 1, 2, -480E6 ET, BRICK24 MESH, 1, 10, 2, 2

The definition of our simulation is finished. Click on Submit to send script to calculation.

**Note:** Sequence of the commands in the script is irrelevant.

### Results

You get the maximal deflection of the structure: ${u}_{\mathrm{max}}=4.52mm$.

### Solver's log

Simulation start *** BLOCK 0: ni = 10nj = 2nk = 2 Number of elements = 40, Number of unknowns = 270, s_opt = 41 Gauss_elimination 1. dqmax = 0,00451085367507972, DMX = ,0045114281, PRESSURE: dp = 197631711, p = -197631711 2. dqmax = 3,96044445641079E-06, DMX = ,0045153872, PRESSURE: dp = 21618, p = -197635876 3. dqmax = 6,96920886919616E-09, DMX = ,0045153941, PRESSURE: dp = 54, p = -197635916 4. dqmax = 3,23320734970113E-12, DMX = ,0045153941, PRESSURE: dp = 1, p = -197635915 Solver stopped due to: max.decay < epsilon (dp = 1) Solver has finished reaching maximal number of iterations.