This NASA Technical Standard establishes the fracture control requirements for National Aeronautics and Space Administration (NASA) human-rated spaceflight hardware. In accordance with NASA Procedural Requirements (NPR) 8705.2B, Human-Rating Requirements for Space Systems, it is NASA’s policy to produce human-rated space systems that have failure tolerance for catastrophic events or that potentially catastrophic hazards are controlled through a defined process in which approved standards and margins are implemented that account for the absence of failure tolerance.
Programs that are not human-rated may choose to impose these requirements on a mission or hardware to bolster the program or to serve as a stepping-stone for human rating.
Controlled by: NASA LIST OF TABLES
| Section | Title | Page |
|---|---|---|
| 1 Overview of Fracture Control Requirements in NASA-STD-5019A | 11 | |
| 2 General Requirements | 102 | |
| 3 Exempt | 103 | |
| 4 NFC Requirements | 104 | |
| 5 Fracture Critical Requirements | 107 | |
| 6 Flaw Screening, Evaluation, and Materials Requirements | 111 | |
| 7 Documentation and Verification | 115 | |
| 8 Alternative Approach Requirement | 117 |
NASA-STD-5019A w/CHANGE 4
| 1 | 2 | |
|---|---|---|
| 6.1.2.2 | NFC External Shatterable Components. | 40 |
| 6.1.3 | NFC Rotating Hardware | 41 |
| 6.1.4 | NFC Sealed Containers. | 41 |
| 6.1.5 | NFC Tools, Mechanisms, and Tethers.. | 43 |
| 6.1.6 | NFC Batteries | 43 |
| 6.2 | General Approaches for NFC Parts | 43 |
| 6.2.1 | NFC Low-Released Mass. | 44 |
| 6.2.2 | NFC Contained | 45 |
| 6.2.3 | NFC Fail-Safe. | 46 |
| 6.2.4 | NFC NHLBB Pressurized Components | 47 |
| 6.2.5 | NFC Low-Risk Parts. | 48 |
| 6.2.6 | NFC Documented Non-Hazardous Failure Mode | 49 |
| 6.3 | Additional Activities for Composite or Bonded NFC Hardware | 50 |
| 7. | ASSESSMENT OF FRACTURE CRITICAL PARTS | 51 |
| 7.1 | Fracture Critical Parts | 51 |
| 7.2 | Established Approaches for Specific Fracture Critical Hardware Types | 53 |
| 7.2.1 | Fracture Critical Metallic Pressure Vessels | 55 |
| 7.2.2 | Fracture Critical COPVS and Composite Overwrapped Pressurized Fluid Containers. | 59 |
| 7.2.3 | Other Fracture Critical Pressure Vessels and Pressurized Fluid Containers | 64 |
| 7.2.4 | Fracture Critical Lines, Fittings, and Other Pressurized Components.. | 66 |
| 7.2.5 | Fracture Critical Habitable Modules and Volumes | 68 |
| 7.2.6 | Fracture Critical Pressurized Structures | 68 |
| 7.2.7 | Fracture Critical Rotating Hardware.. | 70 |
| 7.2.8 | Fracture Critical Fasteners. | 70 |
| 7.2.9 | Fracture Critical Shatterable Components and Structures. | 72 |
| 7.2.10 | Fracture Critical Tools, Mechanisms, and Tethers. | 72 |
| 7.2.11 | Fracture Critical Batteries | 73 |
| 7.3 | General Approach for Fracture Critical Metallic Parts Assessment. | 73 |
| 7.3.1 | Loading Spectra | 74 |
| 7.3.2 | Assessment by Analysis.. | 75 |
| 7.4 | General Approach for Fracture Critical Composite or Bonded Hardware Assessment | 78 |
| 7.4.1 | Damage Threat Assessment. | 80 |
| 7.4.2 | Impact Damage Mitigation Plan | 80 |
| 7.4.3 | Residual Threat Determination. | 81 |
| 7.4.4 | Loading Spectra | 81 |
| 7.4.5 | Damage Tolerance Tests of Coupons. | 81 |
| 7.4.6 | Damage Tolerance Tests of Hardware Elements. | 82 |
| 7.4.7 | Strength and Life Assessments | 82 |
| 7.4.8 | Damage Tolerance Tests of Full-Scale Flight-Like Hardware. | 83 |
| 7.4.9 | Evaluate Flaws or Damage that Occur during BBA Testing. | 84 |
| 7.5 | Optional Approaches for Fracture Critical Parts | 84 |
| 7.5.1 | Single-Event Fracture Critical Components. | 85 |
| 7.5.2 | High-Cycle Fatigue Components. | 86 |
| 7.5.3 | Proof Test Approach for Composite or Bonded Hardware | 87 |
| 7.5.4 | Fleet Leader Testing | 88 |
| 7.5.5 | Hazardous Fluid Containers for Payloads and Experiments.. | 88 |
| 8. FLAW SCREENING, TRACEABILITY, AND MATERIAL SELECTION. | 8. FLAW SCREENING, TRACEABILITY, AND MATERIAL SELECTION. | 89 |
| 8.1 | Flaw Screening. | 90 |
| 8.1.1 | NDE for Metallic Parts | 90 |
| 8.1.2 | NDE for Composite or Bonded Parts. | 91 |
| 8.1.3 | Proof Test | 92 |
| 8.1.4 | Process Control | 92 |
| 8.1.5 | Detected Flaws. | 93 |
| 8.2 | Traceability for Fracture Control | 94 |
| 8.3 | Material Selection and Usage for Fracture Critical Parts | 95 |
| 9. FRACTURE CONTROL DOCUMENTATION AND VERIFICATION | 9. FRACTURE CONTROL DOCUMENTATION AND VERIFICATION | 96 |
| 9.1 | Fracture Control Documentation | 96 |
| 9.1.1 | Fracture Control Plan | 96 |
| 9.1.2 | Engineering Drawings | 96 |
| 9.1.3 | Fracture Control Summary Report. | 96 |
| 9.2 | Verification | 98 |
| 10. ALTERNATIVES | 10. ALTERNATIVES | 99 |
| APPENDIX A: REQUIREMENTS COMPLIANCE MATRIX | APPENDIX A: REQUIREMENTS COMPLIANCE MATRIX | 101 |
| A.1 | PURPOSE AND/OR SCOPE | 101 |
| A.2 | REQUIREMENTS COMPLIANCE MATRIX TABLES | 101 |
| APPENDIX B: REFERENCE DOCUMENTS | APPENDIX B: REFERENCE DOCUMENTS | 118 |
| B.1 | PURPOSE AND/OR SCOPE | 118 |
| B.2 | GOVERNMENT DOCUMENTS | 118 |
| B.3 | NON-GOVERNMENT DOCUMENTS | 119 |
| B.4 | OTHER DOCUMENTS | 120 |
| 1 | Overview of Fracture Control Requirements in NASA-STD-5019A | 11 |
| 2 | General Requirements | 102 |
| 3 | Exempt | 103 |
| 4 | NFC Requirements | 104 |
| 5 | Fracture Critical Requirements | 107 |
| 6 | Flaw Screening, Evaluation, and Materials Requirements | 111 |
| 7 | Documentation and Verification | 115 |
| 8 | Alternative Approach Requirement | 117 |