# Retrieving strain energy from COMBIN39 nonlinear spring element

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 August 15, 2022, 13:49 Retrieving strain energy from COMBIN39 nonlinear spring element #1 New Member   Johannes Schneider Join Date: Mar 2021 Posts: 3 Rep Power: 3 I use nonlinear springs type COMBIN39 to model contact of a loaded cantilever beam (BEAM188) with stiff ground. The COMBIN39 elements are evenly distributed along the beam, representing a continous bedding. As long as there is no beam-ground contact, the stiffness of these elements is very small k0 (zero stiffness is not allowed). Initially beam and ground are separated by a distance w*. As soon as the beam touches the ground (w >= w*), there is a change in stiffness k1 >> k0. I can model this nonlinear behaviour with a set of real constants: r,3,0,0,w*,k0,w*+1,k1 I want to read the total strain energy (SENE). To do so i use element-tables which i then sum up: esel,s,ename,,188 etable,sene188,sene ... esel,s,ename,,39 etable,sene39,sene ... allsel ssum The output for sene188 looks fine, but for sene39 it is always zero. From the total potential for a linear spring i know that U = 1/2 k w^2 and thus in this case U = 1/2 k1 (w-w*)^2. From an approximate calculation by hand i know that this is unequal zero. Does anyone know how to retrieve the strain energy from a COMBIN39 element?

 August 18, 2022, 09:27 No strain energy available for COMBIN39 #2 New Member   Johannes Schneider Join Date: Mar 2021 Posts: 3 Rep Power: 3 In table 14.4: Exceptions for Element Energies from the theory reference manual the COMBIN39 is listed and thus no energy is available for this element type. For this simulation a COMBIN40 element might be suitable.

 Tags ansys, combin39, strain energy

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