Two questions: Does it converge without the BISO plasticity included? If yes, is the plastic strain very local or thru an entire section.
If thru an entire section, the non-convergence could be indicative of a physical instability (i.e. part will yield and break under this load and with this material). If plastic strain is very localized, perhaps it is fictitious. Sometimes a coarser mesh is helpful or adding a more generous radius (if applicable).
If it does not converge, even with no plasticity included, the source of non-convergence is something else, perhaps contact is insufficiently scoped or pinball is too small, but it depends on the feedback in solver output.
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