"" the primary structural concept being developed under the ERA program in the airframe technology element is the pultruded rod stitched efficient unitized structure (prseus) design. The prseus design…

"" the primary structural concept being developed under the ERA program in the airframe technology element is the pultruded rod stitched efficient unitized structure (prseus) design. The prseus design approach is part of the ERA effort to address fuel burn (C02 emissions) by reducing the weight of advanced structures. Reducing fuel burn reduces the need to use resources and reduces pollution. Prseus represents a new concept in composite design theory and manufacturing methods. IT is a conscious progression away from conventional laminated and bonded assemblies toward larger one-piece panel designs with seamless transitions and damage-arrest interfaces such as stitch rows and tear straps. IT focuses on a new structural concept that integrates skin, stringers, and frame elements into a single large panel in which all elements are simultaneously cured (or CO-cured) in one high-temperature cure cycle. The resulting structure is a novel solution for addressing the demanding fuselage loading requirements inherent in a pressurized shaped vehicle like the hybrid wing body (HWB) concept. The prseus concept builds upon, extends, and tailors these structural technologies in order to meet the demanding challenges associated with vehicles with shapes and load paths different from today s traditional wing and circular fuselage structures. Having demonstrated the unique capability of the HWB prseus structural concept to economically produce large integrated structural panels, the primary airframe design challenge now becomes the validation of the structural performance in the combined loading environment of the HWB pressure shell. Under these conditions, skin panels must not only have continuous load paths in both directions (i.e., NX and NY), they must also be effective in transmitting internal pressure loads (i.e., NZ) for the near-flat panel geometry. Demonstration of this capability is the primary purpose of the multi-BAY box test article. Larc will subject the multi-BAY box test article to a series of tests in the combined loads test system (colts) test facility at larc. Among other conditions, the large loading platens in colts will be used to impart a bending moment on the test article as IT is simultaneously pressurized. This nonlinear design regime will be used to demonstrate the structural performance of the prseus concept, so that the weight penalty associated with the non-circular HWB pressure cabin can be quantitatively assessed. The multi-BAY box test article, including 11 prseus panels, was designed under NASA larc contract/task order NNL04AA11B/NNL10AB00T with boeing. Under NNL10AB68T, boeing shall assemble the multi-BAY box test article. 2.0 objective/scope: the objective/scope of this task order is the fabrication and delivery of structural panels using the prseus concept for use in the large scale multi-BAY box test article. 3.0 description of the work/tasks to be performed: the contractor shall perform the following tasks: 3.1 multi-BAY box test article panel fabrication the contractor shall use tooling identified in SOW 6.2 to fabricate prseus structural panels for use in the assembly of the multi-BAY box test article. (deliverable item 4.7) 3.2 preparation of untrimmed panels for assembly prseus structural panels for the multi-BAY box test article will be provided as GFP as specified under SOW 6.1. The contractor shall trim the panels, bond shims if needed and machine the shims, and visually inspect the panels to prepare them for assembly in the multi-BAY box test article. (deliverable item 4.5)