Neuber Stress and Neuber Strain sensitivities are supported for optimization in small displacement NLSTAT. It was already supported for optimization in FASTCONT analysis. It is supported only for small displacement analysis, it is not supported for large displacement. Once Neuber response is defined, the material will be treated as linear and MATS1 props are used only for Neuber correction. It is supported for solids as well as shells. It is supported for all optimization types except topology & freesize optimization.