First you need to make sure that you have selected the correct material model. What model are you using? You say the material is hyperelastic but the force load curve looks like a bilinear plasticity model. Also looking at the structure you may want to use share topology and create a conformal mesh (
" target="blank">) instead of using contacts. If you are using a bonded contact define the contacts between faces which are touching like the circular end face of horizontal pipe and the cylindrical face of vertical pipe. Also do a mesh convergence study to make sure that the mesh is fine enough.
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