Progressive failure analysis of inelastic space truss structures

In general, the progressive failure analysis of space truss systems can only be adequately evaluated with both material and geometric nonlinearities considered. This paper utilizes constitutive relationships to provide the fundamental modeling of elastic and inelastic member behavior, coupled with a geometrically nonlinear finite element model. Modeled member material behavior modes include: buckling, yielding, inelastic post-buckling, unloading, and reloading. Geometric nonlinearity is based on iteratively correcting the linearized updated Lagrangian space truss displacement equations. Interaction of the nonlinear loading behavior results in structure force redistribution which can lead to member failure, unloading, or reloading. Such behavior can lead to the progressive failure of a space truss structure. The developed model traces the sequence of localized buckling, yielding, and inelastic member response. Results are presented to demonstrate model capabilities for representing the inelastic, progressive failure response of space truss structures.