刚性体撞击刚性地面，为什么会发生穿透？
一个刚体的的块，用mat_rigid定义的材料，只施加了重力，放在刚性地面上，用rigidwall-planar定义刚性地面上。刚体会穿透刚性地面，这是为什么？
*CON TROL_CONTACT
$# slsfac rwpnal islchk shlthk penopt thkchg orien enmass
0.1 1.0 1 0 1 0 1 0
$# usrstr usrfrc nsbcs interm xpene ssthk ecdt tiedprj
0 0 0 0 4.0 0 0 0
$# sfric dfric edc vfc th th_sf pen_sf
0.0 0.0 0.0 0.0 0.0 0.0 0.0
$# ignore frceng skiprwg outseg spotstp spotdel spothin
2 0 0 0 0 0 0.0
$# isym nserod rwgaps rwgdth rwksf icov swradf ithoff
0 0 1 0.0 1.0 0 0.0 0
$# shledg pstiff ithcnt tdcnof ftall unused shltrw
0 0 0 0 0 0.0
*CON TROL_TERMINATION
$# endtim endcyc dtmin endeng endmas nosol
12.0 0 0.0 0.01.000000E8 0
*CON TROL_TIMESTEP
$# dtinit tssfac isdo tslimt dt2ms lctm erode ms1st
0.0 0.667 0 0.0 0.0 0 0 0
$# dt2msf dt2mslc imscl unused unused rmscl
0.0 0 0 0.0
*DATABASE_BINARY_D3PLOT
$# dt lcdt beam npltc psetid
0.01 0 0 0 0
$# ioopt
0
*DATABASE_BINARY_D3THDT
$# dt lcdt beam npltc psetid
0.01 0 0 0 0
*DATABASE_EXTENT_BINARY
$# neiph neips maxint strflg sigflg epsflg rltflg engflg
0 0 3 0 1 1 1 1
$# cmpflg ieverp beamip dcomp shge stssz n3thdt ialemat
0 0 0 1 1 1 2 1
$# nintsld pkp_sen sclp hydro msscl therm intout nodout
0 0 1.0 0 0 0STRESS
$# dtdt resplt neipb quadr cubic
0 0 0 0 0
*DATABASE_FORMAT
$# iform ibinary
0 0
*LOAD_BODY_Y
$# lcid sf lciddr xc yc zc cid
1 1.0 0 0.0 0.0 0.0 0
*PART
$# title
kuai
$# pid secid mid eosid hgid grav adpopt tmid
3 1 1 0 0 0 0 0
*SECTION_SOLID
$# secid elform aet
1 1 0
*MAT_RIGID
$# mid ro e pr n couple m alias
1 7850.02.10000E11 0.3 0.0 0.0 0.0
$# cmo con1 con2
0.0 0 0
$#lco or a1 a2 a3 v1 v2 v3
0.0 0.0 0.0 0.0 0.0 0.0
*RIGIDWALL_PLANAR_ID
$# id title
1
$# nsid nsidex boxid offset birth death rwksf
2 0 0 0.0 0.01.00000E20 1.0
$# xt yt zt xh yh zh fric wvel
6.0 0.0 6.8 6.0 1.55 6.8 0.8 0.0
*DEFINE_CURVE
$# lcid sidr sfa sfo offa offo dattyp lcint
1 0 1.0 1.0 0.0 0.0 0 0
$# a1 o1
0.0 0.0
10.0 9.8
12.0 9.8
淦你丫 
