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stress=frame.fieldOutputs['S']       
centerArea=odb.rootAssembly.nodeSets['SET-BC-SymmX']   #×ÓÇøÓòËÑË÷¶¨Òå
centerStress=stress.getSubset(region=centerArea, position=ELEMETN_NODAL)

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for stressValue in centerStress.values:
if (not maxValue or stressValue.maxPrincipalstress>maxValue.maxPrincipalstress):  
maxValue=stressValue

print maxValue
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