# Eroding — Welcome to LS-DYNA Examples

A projectile strikes a plate at a critical angle.

## Introduction

```*CONTACT_ERODING_SURFACE_TO_SURFACE
Projectile Penetrates Plate
LS-DYNA Manual Section: *CONTACT_ERODING_SURFACE_TO_SURFACE

*INITIAL_VELOCITY_GENERATION

Example: Projectile Penetrates Plate

Filename: contact.projectile.k

Description:
A projectile strikes a plate at a critical angle.

Model:
The hemispherical projectile has a length of 7.67 cm and a diameter of
0.767 cm. The plate measures 23.01 cm * 23 cm * 0.64 cm. The projectile and
the plate are elastic perfectly plastic with failure strain. The initial
velocity of the projectile is 0.129 cm/ microsecond at an angle of 75 degrees.
The calculation terminates at 110.0 usec.

Input:
The initial velocity (magnitude and direction) of the projectile is set using
*INITIAL_VELOCITY_GENERATION. Eroding contact between the projectile surface
and plate surface is defined so that the contact erodes as the element erodes
(*CONTACT_ERODING_SURFACE_TO_SURFACE). This allows the contact to work
correctly as layers of the parts erode during penetration.

Results:
The projectile fractures into a tip and trailing portion. The trailing portion
punches a hole through the plate while the tip deflects off the plate.```

## Keywords

```*CONTACT_ERODING_SURFACE_TO_SURFACE
*CONTROL_CONTACT
*CONTROL_ENERGY
*CONTROL_OUTPUT
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DATABASE_BINARY_D3THDT
*DATABASE_EXTENT_BINARY
*DATABASE_GLSTAT
*DATABASE_MATSUM
*DATABASE_RCFORC
*DATABASE_SLEOUT
*ELEMENT_SOLID
*END
*INITIAL_VELOCITY_GENERATION
*KEYWORD
*MAT_PLASTIC_KINEMATIC
*NODE
*PART
*SECTION_SOLID
*SET_PART
*TITLE```

## Reduced Input

```  *KEYWORD
*TITLE
Projectile Penetrating Plate
\$
\$  LSTC Example
\$
\$
\$   Units: gram, cm, microsec, 1e+07 N, Mbar, 1e+07 N-cm
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$\$\$\$  Control Ouput
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
\$
*CONTROL_TERMINATION
\$   endtim    endcyc     dtmin    endneg    endmas
1.100E+02
\$
*CONTROL_CONTACT
\$   slsfac    rwpnal    islchk    shlthk    penopt    thkchg     orien
1.0
\$   usrstr    usrfac     nsbcs    interm    xpenen

\$
*CONTROL_ENERGY
\$     hgen      rwen    slnten     rylen
2         2
\$
*CONTROL_OUTPUT
\$    npopt    neecho    nrefup    iaccop     opifs    ipnint    ikedit
1         3
\$
\$
*DATABASE_BINARY_D3PLOT
\$       dt      lcdt
10.000000
\$
*DATABASE_EXTENT_BINARY
\$    neiph     neips    maxint    strflg    sigflg    epsflg    rltflg    engflg

\$          ieverp = 1 put each plot state in separate d3plot files
\$   cmpflg    ieverp    beamip
1
\$
*DATABASE_BINARY_D3THDT
\$       dt      lcdt
999999
\$
*DATABASE_GLSTAT
\$       dt
0.10
\$
*DATABASE_MATSUM
\$       dt
0.10
\$
*DATABASE_RCFORC
\$       dt
0.10
\$
*DATABASE_SLEOUT
\$       dt
0.10
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$\$\$\$  Define Contacts
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
\$
*CONTACT_ERODING_SURFACE_TO_SURFACE
\$     ssid      msid     sstyp     mstyp    sboxid    mboxid       spr       mpr
1         2         3         3
\$
\$       fs        fd        dc        vc       vdc    penchk        bt        dt

\$
\$      sfs       sfm       sst       mst      sfst      sfmt       fsf       vsf

\$
1         1
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$\$\$\$  Initial Conditions
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$\$\$\$  Assign an initial velocity to the projectile (part 1) angled down
\$\$\$\$  towards the plate.
\$
\$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
\$
*INITIAL_VELOCITY_GENERATION
\$      sid      styp     omega        vx        vy        vz
1         1           1.246E-01 0.000E+00-3.339E-02
\$
\$       xc        yc        zc        nx        ny        nz     phase

\$
*SET_PART
1
1
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$\$\$\$  Define Parts and Materials
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$...>....1....>....2....>....3....>....4....>....5....>....6....>....7....>....8
\$
*PART
\$      pid       sid       mid     eosid      hgid    adpopt
Projectile
1         1         1
Plate
2         1         2
\$
\$
\$\$\$\$\$\$  Materials
\$
\$\$\$\$  failure strain for erosion of the projectile and plate elements are
\$\$\$\$  set as:  fs = 0.8
\$
*MAT_PLASTIC_KINEMATIC
\$      mid        ro         e        pr      sigy      etan      beta
1 1.862E+01 1.170E+00      0.22 1.790E-02                 1.0
\$      src       srp        fs
0.8
\$
\$
*MAT_PLASTIC_KINEMATIC
\$      mid        ro         e        pr      sigy      etan      beta
2 7.896E+00 2.100E+00     0.284 1.000E-02                 1.0
\$      src       srp        fs
0.8
\$
\$
\$\$\$\$\$\$  Sections
\$
*SECTION_SOLID
\$      sid    elform
1         0
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
\$\$\$\$  Define Nodes and Elements
\$
\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$\$
\$
*END```