# OS-E: 4010 Connecting Rod of a Slider Crank

This example involves the shape optimization of the connecting rod of a slider crank.

## Model Files

Before you begin, copy the file(s) used in this example to your working directory.

## Model Description

The mass of the connecting rod is to be minimized. Initial velocity is applied to the block of the model. The stress of all connecting rod elements must be less than an allowable value.
Input decks for the design are as follows.
SUBCASE     1
MBSIM   = 1
INVEL   = 2
DESSUB  = 10
SPC     = 10
$BEGIN BULK$
DESVAR      1   UPPER0.0     -1.0    2.0
DESVAR      2   LOWER0.0     -1.0    2.0
DESVAR      3LEFT_OUT0.0     -1.0    1.0
DESVAR      5RIGHT_OU0.0     -1.0    1.0
$DRESP1 1 MASS MASS PSOLID 18 DRESP1 2 STRESS STRESS PSOLID SVM 18$
DCONSTR  10    2     -100.E1 100.E1

DVGRID*         1       9925511       0      1.0
*       -1.568286121E-02-3.884642199E-02-6.483015791E-10
:
:

## Results

The final design appears as shown below: