4, November 2015

ESA Open Invitation To Tender AO8361
Open Date: 29/10/2015
Closing Date: 10/12/2015

Status: ISSUED
Reference Nr.: 15.133.05
Prog. Ref.: GSTP Period 6 E1 PRJ
Budget Ref.: E/0904-611 – GSTP Period 6 E1 PRJ
Special Prov.: DE+IE+PL
Tender Type: C
Price Range: 200-500 KEURO
Establishment: ESTEC
Directorate: Directorate of Technical & Quality Manag
Department: Mechanical Engineering Department
Division: Structure and Mechanisms Division
Contract Officer: Almeida, Rudolfo
Last Update Date: 29/10/2015
Update Reason: Tender issue

Objectives are to answer to the following questions: – Are the currently used failure criteria that are available in most commercial FE codes appropriate for the thermo-mechanical loading conditions induced by cryogenic environments. – Are the current common practices to determine material allowable values with UD laminate samples appropriate for the strength verification for thermomechanical loading in combination with the commonly used failure criteria. – If above questions are answered negatively: How can the the strength verification for laminate structures under severe cryogenic thermo-mechanical loading be improved. Proposed activities: – Assess and identify the limitations of the commonly used approach for strength verification of composite laminates under cryogenic thermo-mechanical environment (including modelling, failure criteria with supporting test methods to determine allowable values) -€ Assess relevance of stacking sequences of plies in the laminate for resistance against cryogenic thermo-mechanical loading. -€Propose and develop alternatives for currently applied strength verification methods. These alternative methods can be based on alternative modelling approaches, alternative failure criteria and alternative methods to determine allowable material values using revised sample test methods. – Verify the alternative strength verification methods for laminates under cryogenic thermo-mechanical loading with tests on laminates with various lay-ups subjected to cryogenic environment.

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