---- Elastic-Plastic Torsion Problem -----
mx: 10     my: 10   

iter =   0, Function value -0.330579, Residual: 0.728961 
iter =   1, Function value -0.330579, Residual: 0.728961 
iter =   1, Function value -0.390666, Residual: 0.428718
iter =   2, Function value -0.390666, Residual: 0.428718 
iter =   2, Function value -0.410884, Residual: 0.245953 
iter =   3, Function value -0.423512, Residual: 0.196625
iter =   4, Function value -0.426263, Residual: 0.0946557
iter =   5, Function value -0.427593, Residual: 0.018164 
iter =   6, Function value -0.427651, Residual: 0.0234349
iter =   7, Function value -0.427667, Residual: 0.0277088
iter =   8, Function value -0.427667, Residual: 0.0277088
iter =   8, Function value -0.427702, Residual: 0.0211122
iter =   9, Function value -0.427721, Residual: 0.01693
iter =  10, Function value -0.427721, Residual: 0.01693
iter =  10, Function value -0.427742, Residual: 0.00352154
iter =  11, Function value -0.427737, Residual: 0.00961036
iter =  12, Function value -0.427744, Residual: 0.00231639
iter =  13, Function value -0.427744, Residual: 0.000700642