U =
   -0.0052471
            0
    0.0018958
   -0.0090386
            0
    -0.016296
            0
    -0.020088

F =
            0
        1e+05
            0
       -50000
        50000
            0
       -50000
       -50000

F_element =
        13270
        50000
        44906
       -63270
       -13270
        31635

Stress_element =
   4.4235e+07
   1.6667e+08
   1.4969e+08
   -2.109e+08
  -4.4235e+07
    2.109e+08