hexa2016
Mechanical
- Sep 19, 2016
- 26
Dear all,
I am running a transient analysis on rubber bearing which tested with compression + horizontal loading. The vertical pressure applied on top surface for 6 MPa, then cyclic load at 0.5Hz for 25mm displacement. Bottom surface is fixed at all dof. I defined the load pattern as triangular wave and the analysis is using multiple load-steps.
solu
antype,4
trnopt,full
nlgeom,1
deltim,0.5
solcontrol,on
outres,all,all
timint,on
time,3
kbc,0
asel,s,area,,1
nsla,s,1
d,all,all !fixed bottom surface
allsel
asel,s,area,,182
nsla,s,1
sf,all,pres,6 !6 MPa on top surface
allsel
lswrite !ls1
!Time at 3.125
time,3.125
asel,s,area,,182
nsla,s,1
d,all,ux,6.25
allsel
lswrite !ls2
!Time at 3.25
time,3.25
asel,s,area,,182
nsla,s,1
d,all,ux,12.5
allsel
lswrite !ls3
......continue to final loadstep
at loadstep1, I set the initial condition (6MPa vertical pressure + set the bottom surface fixed at all dof)for 3 seconds . And the cylic load on horizontal direction started in loadstep 2.
But I problem in the first step, where the vertical pressure keep going up and down for few times in the first load-step. In experimental work, the pressure is is applied for 6MPa, then under 6Mpa vertical vertical the lateral cyclic load is applied.
How can i solved this?
thanks
I am running a transient analysis on rubber bearing which tested with compression + horizontal loading. The vertical pressure applied on top surface for 6 MPa, then cyclic load at 0.5Hz for 25mm displacement. Bottom surface is fixed at all dof. I defined the load pattern as triangular wave and the analysis is using multiple load-steps.
solu
antype,4
trnopt,full
nlgeom,1
deltim,0.5
solcontrol,on
outres,all,all
timint,on
time,3
kbc,0
asel,s,area,,1
nsla,s,1
d,all,all !fixed bottom surface
allsel
asel,s,area,,182
nsla,s,1
sf,all,pres,6 !6 MPa on top surface
allsel
lswrite !ls1
!Time at 3.125
time,3.125
asel,s,area,,182
nsla,s,1
d,all,ux,6.25
allsel
lswrite !ls2
!Time at 3.25
time,3.25
asel,s,area,,182
nsla,s,1
d,all,ux,12.5
allsel
lswrite !ls3
......continue to final loadstep
at loadstep1, I set the initial condition (6MPa vertical pressure + set the bottom surface fixed at all dof)for 3 seconds . And the cylic load on horizontal direction started in loadstep 2.
But I problem in the first step, where the vertical pressure keep going up and down for few times in the first load-step. In experimental work, the pressure is is applied for 6MPa, then under 6Mpa vertical vertical the lateral cyclic load is applied.
How can i solved this?
thanks