0.92 -2.63E+08

0.94 -2.69E+08

0.96 -2.49E+08

0.96 -2.94E+08

0.96 -2.94E+08

0.98 -2.56E+08

0.98 -3.06E+08

0.98 -3.06E+08

1 -2.62E+08

1 -3.18E+08

1 -3.18E+08

this is the stress values at some node....n u can observe i have given yieild strength as 268.8MPa...n here as soon as the stress crosses the yield point, i am getting triple values fr same time in output....what could be the possible reason...as it is giving only one value when it was in linear elastic region...i am doing a static analysis of sandwich honeycomb(square)  structure