AUTOMATION AND ASSESSMENT OF AUGMENTED LAGRANGIAN ALGORITHMS FOR FRICTIONAL CONTACT PROBLEMS

In recent work, the augmented Lagrangian approach to large deformation frictional contact problems has been advocated for finite element cal culations. The resulting algorithms have been shown to facilitate accu rate constraint enforcement in a robust manner, while providing an eff ective technique for removal of the nonsymmetry associated with most f rictional constitutive laws. In this work, we examine automation schem es for the algorithm, such that multipliers can be determined to a spe cified degree of accuracy without user intervention. The performance o f the resulting automatic augmentation algorithm is then examined, pro viding important information about practical attributes of the procedu re.