Hello,<\/p>\n
I would like to know what is the precise theory\/formulation behind the enhanced assumed strain method for 8-noded hexahedral element that Ansys Mechanical uses. More precisely SOLID185 element with KEYOPT(2)=2 and KEYOPT(6)=0.<\/p>\n
In the Ansys Mechanical Theory Reference manual it is mentioned that: “SOLID185 with KEYOPT(2)=2 or 3 the enhanced strain formulations from the work of Simo and Rifai([318] (p. 935)),Simo and Armero([319] (p. 935)), Simo et al.([320] (p. 935)), Andelfinger and Ramm([321] (p. 935)), and Nagtegaal and Fox([322] (p. 935)) are used. It introduces 13 internal degrees of freedom to prevent shear and volumetric locking for KEYOPT(2) = 2, and 9 degrees of freedom to prevent shear locking only for KEYOPT(2) = 3. If mixed u-P formulation is employed with the enhanced strain formulations, only 9 degrees of freedom for overcoming shear locking are activated.<\/em>“<\/p>\n I have found the correct theory for the “Simplified” Enhanced Assumed Strain formulation for SOLID185 with KEYOPT(2)=3 and KEYOPT(6)=0 from Andelfinger’s paper or at least this calculated indentical results.<\/p>\n In the theory of Simo<\/em> et al.([320] <\/em>it is mentioned that the Simo’s modified EAS formulation needs special 9-point quadrature rule (instead of the traditional 8-point 2x2x2 Gaussian quadrature rule) for the numerical integration. Does the SOLID185 with KEYOPT(2)=2 and KEYOPT(6)=0 use the identical approach ?<\/p>\n So the question is that from which paper or where could I find the correct theory\/formulation for the SOLID185 with KEYOPT(2)=2 and KEYOPT(6)=0 ?<\/p>\n Best regards,<\/p>\n Pirkka<\/p>\n","protected":false},"template":"","class_list":["post-294770","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t