| 4.4.4.4-6-1 Ensure that material mechanical properties (allowables, stiffness, etc.) are well characterized |
Phase A |
Phase B |
Phase C |
Phase D1 |
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Ensure that properties are characterized in sufficient detail unless they are available from a reliable source. A-basis strength values should be used for all primary structures they are not fail safe. B-basis should be used for fail-safe or secondary structures. Composite materials should be sufficiently characterized for all critical failure modes and expected environmental conditions.
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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| 4.4.4.4-6-2 Ensure that all relevant load events have been identified, defined and analyzed |
Phase B |
Phase C |
Phase D1 |
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Ensure anticipated loads throughout the service life of the structure are used to define those used for design analysis and testing. .
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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| 4.4.4.4-6-3 Ensure the effect of the environment on mechanical properties is evaluated |
Phase B |
Phase C |
Phase D1 |
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Ensure all the environments that may affect the physical and mechanical properties of the materials are considered in design of the structure.
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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| 4.4.4.4-6-4 Ensure adequacy of finite element models used for margin assessment and coupled loads analysis are evaluated |
Phase B |
Phase C |
Phase D1 |
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Ensure adherence of model to drawings and correlation to test data. At PDR, CDR, post model correlation to static and modal tests and prior to the Verification coupled loads cycle.
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NA
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NA
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Independent structural Loads Analyses of Integrated Spacecraft/Launch Vehicle Systems (TOR-2003(8583)-2886)
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| 4.4.4.4-6-5 Ensure predicted analysis has positive structural margins of safety using appropriate safety factors |
Phase B |
Phase C |
Phase D1 |
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Ensure all mechanical hardware items possess adequate strength to preclude detrimental deformation at design yield load. They also should possess adequate strength to preclude catastrophic failure at design ultimate load. Appropriate material allowables should be used.
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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| 4.4.4.4-6-6 Ensure the effect of dynamic and thermal distortions on performance requirements is considered |
Phase B |
Phase C |
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Ensure structures remain stable under given environments during ground and flight operation phases. Orbital disturbances that can cause instability or performance degrading deflections should be addressed.
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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| 4.4.4.4-6-7 Ensure that structures possess adequate fatigue life |
Phase B |
Phase C |
Phase D1 |
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Ensure all structural items should have adequate fatigue life in order to achieve mission success.
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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| 4.4.4.4-6-8 Ensure fracture critical structural items have adequate damage tolerance |
Phase B |
Phase C |
Phase D1 |
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Ensure that the largest flaw size that could go undetected in a fracture critical item will not grow to failure when subjected to cyclic loads for service life by analysis or test.
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NA
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NA
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Space Systems - Structures Design and Test Requirements (TOR-2003(8583)2894)
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