Hi Good evening to all,

I am a beginner for Abaqus, as i am doing one analysis by taking a journal file, this analysis will deal with axial crushing of square tube with Rigid impactor. In this the Formula for Axial crushing force is given by P=9.56*Yeild Strength*Thickness^(5/3)*Width^(1/3).=80437.827 Newton

As i tried this in performing Abaqus CAE with Properties like, width=50mm, Thickness=3mm, E=190Gpa, Poissons=0.27, Yeild stress=366MPa, Impactor velocity=30KMPH, after converting, Velocity=8333.33 mm/sec.

Impactor=Discrete rigid,planar,shell 100*100, Tube=50*50mm, length=150mm.

Materials=E>190e3, Poissons=0.27, Density=7800e-9, Plasticity> Yeild stress> 366, Plastic strain>0

Assembly= 10mm gap between tube and Impactor

Step= Dynamic, Explicit, Time=0.02 sec

Interaction=General contact, Property=tangential, Rough

Load= Tube end>ENCASTRE,step>initial

            other end of Tube>Displacement/Rotation> 4 edges has to move only in Z direction,step=initial

             Impactor RP> Displacement?rotation>only in Z direction,step=initial

            Impactor Velocity> Velocity> V3=8333.33, step=Dynamic, Explicit

Mesh= S4R element for tube

As i run the analysis it is terminating with error " Exceessive rotation of nodes in node set ErrNodeExcessRotatio-step1"

So please any one can tell me how to correct this problem.