大家帮我看下这是怎么回事，很简单的压杆实验

报错是：The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively.
Print-out suppressed for subsequent distorted elements
There are a total of 324 excessively distorted elements
The ratio of deformation speed to wave speed exceeds 1.0000 in at least one element. This usually indicates an error with the model definition. Additional diagnostic information may be found in the message file.
The elements contained in element set ErrElemExcessDistortion-Step1 have distorted excessively.
Abaqus/Explicit Analysis exited with an error - Please see the status file for possible error messages if the file exists.
Date file 如下所示：
1
Abaqus 6.10-1 Date 07-Apr-2013 Time 11:00:09
For use by TEAM TBE under license from Dassault Systemes or its subsidiary.
The Abaqus Software is a product of:
Dassault Systemes Simulia Corp.
Rising Sun Mills
166 Valley Street
Providence, RI 02909-2499, USA
The Abaqus Software is available only under license
from Dassault Systemes or its subsidiary and may be
used or reproduced only in accordance with the terms
of such license.
On machine dell-PC
you are authorized to run
Abaqus/Explicit until 11-Nov-2017
Your site id is: 20111111
For assistance or any other information you may
obtain contact information for your local office
from the world wide web at:
http://www.simulia.com/about/locations.html
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* *
* ***************** *
* * N O T I C E * *
* ***************** *
* *
* *
* Abaqus 6.10-1 *
* *
* BUILD ID: 2010_04_29-14.17.36 102575 *
* *
* *
* Please make sure you are using release 6.10manuals *
* plus the notes accompanying this release. *
* *
* *
* *
* *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
PROCESSING PART, INSTANCE, AND ASSEMBLY INFORMATION
*******************************************************
END PROCESSING PART, INSTANCE, AND ASSEMBLY INFORMATION
***********************************************************
OPTIONS BEING PROCESSED
***************************
*Heading
*Node
*Element, type=C3D8R
*Nset, nset=ASSEMBLY_SHIJIAN-1__PICKEDSET17
*Elset, elset=ASSEMBLY_SHIJIAN-1__PICKEDSET17
*Nset, nset=ASSEMBLY__PICKEDSET64
*Elset, elset=ASSEMBLY__PICKEDSET64
*Elset, elset=ASSEMBLY___PICKEDSURF63_S2
*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF63
*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF63
*material, name=SHIJIAN
*conductivity
*density
*elastic
*plastic, hardening=JOHNSONCOOK
*ratedependent, type=JOHNSONCOOK
*specificheat
*material, name=SHIJIAN1
*density
*elastic
*specificheat
*surfaceinteraction, name=CON
*friction
*solidsection, elset=ASSEMBLY_SHIJIAN-1__PICKEDSET17, material=SHIJIAN1
*solidsection, elset=ASSEMBLY_SHIJIAN-1__PICKEDSET17, material=SHIJIAN1
*solidsection, elset=ASSEMBLY_SHIJIAN-1__PICKEDSET17, material=SHIJIAN1
*friction
*elementoutput, directions=YES
*amplitude, name=AMP
*amplitude, name=AMP-2
*amplitude, name=AMP-3
*amplitude, name=AMP-4
*amplitude, name=AMP-5
*amplitude, name=AMP-6
*amplitude, name=AMP-7
*output, field
*output, history
*Step, name=Step-try1
*Step, name=Step-try1
*dynamic, explicit, directusercontrol
*boundary
*dsload
*output, field
*elementoutput, directions=YES
*output, history
*energyoutput
*endstep
*surface, type=ELEMENT, name=ASSEMBLY__PICKEDSURF63
*surfaceinteraction, name=CON
*friction
*surfacebehavior, pressure-overclosure=HARD
*Step, name=Step-try1
*dynamic, explicit, directusercontrol
*boundary
***WARNING: THE OPTION *BOUNDARY,TYPE=DISPLACEMENT HAS BEEN USED; CHECK STATUS
FILE BETWEEN STEPS FOR WARNINGS ON ANY JUMPS PRESCRIBED ACROSS THE
STEPS IN DISPLACEMENT VALUES OF TRANSLATIONAL DOF. FOR ROTATIONAL
DOF MAKE SURE THAT THERE ARE NO SUCH JUMPS. ALL JUMPS IN
DISPLACEMENTS ACROSS STEPS ARE IGNORED
*output, field
*output, history
*endstep
- (RAMP) OR (STEP) - INDICATE USE OF DEFAULT AMPLITUDES ASSOCIATED WITH THE STEP
P R O B L E M S I Z E
NUMBER OF ELEMENTS IS 7128
NUMBER OF NODES IS 8119
NUMBER OF NODES DEFINED BY THE USER 8119
TOTAL NUMBER OF VARIABLES IN THE MODEL 24357
(DEGREES OF FREEDOM PLUS MAX NO. OF ANY LAGRANGE MULTIPLIER
VARIABLES. INCLUDE *PRINT,SOLVE=YES TO GET THE ACTUAL NUMBER.)
END OF USER INPUT PROCESSING
JOB TIME SUMMARY
USER TIME (SEC) = 0.50000
SYSTEM TIME (SEC) = 0.0000
TOTAL CPU TIME (SEC) = 0.50000
WALLCLOCK TIME (SEC) = 1