The elastic energy includes energy due to deformation of spring(s) in a rigid body dynamic analysis and is calculated as ½ * Stiffness * elongation2
For Nonlinear spring elements, COMBIN39 can be used and you can see the list of supported output in Table 39.2 of the reference cited below,
https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v222/en/ans_elem/Hlp_E_COMBIN39.html%23aDFXf298lmm
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