from abaqusConstants import *
from abaqus import *
aModel=mdb.models['Straight']
aPart=aModel.parts['PLAQUE1']
Radius=15.
for eachnode in aPart.nodes:
	theta=eachnode.coordinates[1]/Radius
	newcoord1=(Radius-eachnode.coordinates[0])*sin(theta)
	newcoord2=(Radius-eachnode.coordinates[0])*cos(theta)
	newcoord3=eachnode.coordinates[2]
	aPart.editNode(nodes=eachnode,coordinate1=newcoord1,coordinate2=newcoord2,
		coordinate3=newcoord3)