NASA, George C. Marshall Space Flight Center, Procurement Office, Marshall Space Flight Center, AL 35812

A -- ELASTIC-PLASTIC AND FULLY PLASTIC FATIGUE CRACK GROWTH SOL 8-W-6-ED-00189 POC Contact Sandra Presnell, GP22-G, 205-544-0318/Contract Specialist, or Michael Sweigart, GP22/ Contracting Officer NASA/MSFC plans to modify contract NAS8-37828 with Southwest Research Institute (SWRI) for continuation and further development of NASGRO (NASA Fracture mechanics software) software modules previously accomplished under this contract. Continuation of this effort will provide NASA with a practical tool for predicting the failure of flawed metallic aerospace components subjected to appreciable elastic-plastic crack tip stresses. Previous software development has resulted in monotic primary loading capability for the following NASGRO geometries: TC01--through center crack subjected to tension, TC02--through edge crack subjected to tension or bending, EC01--embedded elliptical crack subjected to tension, CC01--corner crack in a rectangular plate subjected to tension or through wall bending, and SC01--surface crack in a rectangular plate subjected to tension or bending. The elastic-plastic software modules currently being proposed for development and integration into NASGRO include capabilities for combined primary and secondary loads, crack closure, cyclic J Integral (Delta J), and fatigue crack growth rate for these same NASGRO geometries. The proposed contract modification is for supplies or services for which the Government intends to solicit and negotiate under the authority of FAR 6.302-1, only one responsible source and no other services will satisfy agency requirements. Negotiations shall be conducted with Southwest Research Institute, 6220 Culebra Road, San Antonio, Texas 78228-0510. Interested firms shall submit their qualifications/capabilities in the critical areas mentioned above, along with a request for a copy of the solicitation within 15 days after publication of this synopsis -- Such qualifications/ capabilities shall be used solely for the purpose of determining whether or not to conduct this procurement on a competitive basis -- Responses received after this date or without the required information will be considered nonresponsive to the synopsis and will not be considered -- A determination by the Government not to compete this proposed modification, on a full and open competition basis, based upon responses to this notice, is solely within the discretion of the Government -- Requests for copies of the solicitation, along with qualifications/capabilities statements must be submitted in writing -- Transmission by facsimile to 205-544-4400 or by Internet e-mail to sandra.presnell@msfc.nasa.gov is acceptable. (0211)

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