Learning Forum

[1shan]

Have a look at section 3.1 Reduced Integration and Selective Reduced Integrationon page 14 of this book - http://mate.tue.nl/mate/pdfs/5513.pdf. The author says that in a selective reduced integration method only the part of a constitutive relation that causes locking is evaluated with a reduced integration scheme while the rest with full integration scheme. In the case of dilatation locking, also a selective reduced integration can be used. In this case a split is made between deviatoric strains and stresses, and dilatational strains and stresses. The dilatational part consists of a change in volume only, whereas the deviatoric part only changes the shape of the element. In this case, the dilatational part is evaluated with a reduced integration scheme, and the deviatoric part with a full integration scheme. My understanding is that the B-bar method is a selective reduced integration method that replaces volumetric strain at the Gauss integration point with the average volumetric strain of the elements, while the deviatoric strain is evaluated with a full integration scheme.
Regards Ishan.