MIL-HDBK-3F Volume 3,Chapter 4 Building Block Approach for Composite Structures TABLE 4.4.1.2(a)DOD/NASA aircraft structure classification and goals vs.PMC building block development tests for prototypes (Reference 4.4.1.1)(continued on next page). PART B (From Figure 4.4.1.1) Aircraft Structure Building Block Structural Development Test Effort Aircraft Structure Development Goals Trade Studies and Conceptual Selection and Proof of Concept Development Analysis Testing and Analytical Methods Development Classification Description Element-Single Load Path Sub-Component-Multiple Load Paths(Including Joints) PRIMARY CARRIES PRIMARY AIR LOADS Concept and analytical methods Proof of concept and analytical development-static and fatigue methods-static and fatigue test test (optional) (residual strength) ● Fracture critical Failure will cause loss of 3-each stiffening configuration 1 box beam/cylinder:static ultimate (F/C) vehicle 3-each joint configuration 1 box beam cylinder:fatigue and ”1年g里 residual strength Noncritical (N/C) Failure will not cause loss of 1-each stiffening configuration 1 box beam/cylinder:static ultimate vehicle 1-each joint configuration SECONDARY CARRIES SECONDARY AIR Concept and analytical methods Proof of concept and analytical OTHER LOADS development-static and fatigue methods-static (DLL/fatigue/ test residual strength test) ·Fatigue critical Failure will not cause loss of 2-each stiffening configuration 2 box beam/cylinder:static (FA/C)&economic vehicle but may cause cost 2-each joint configuration (DLL/fatigue/residual strength test) life critical (ELC) critical parts replacements.... ·Noncritical(N/C) Failure will not cause loss of 1-each stiffening configuration No testing required-proved by vehicle 1-each joint configuration element tests No cost or fatigue critical parts NONSTRUCTURAL NON-OR MINOR LOAD Concept development/static test/ Proof of concept:element testing BEARING analytical methods check plus analysis ·Noncritical(N/C) 。 Failure/replacement of parts 1-each most critical configuration No testing required-proved by causing minor inconvenience, element tests and analysis not cost critical 4-11MIL-HDBK-3F Volume 3, Chapter 4 Building Block Approach for Composite Structures 4-11 TABLE 4.4.1.2(a) DOD/NASA aircraft structure classification and goals vs. PMC building block development tests for prototypes (Reference 4.4.1.1) (continued on next page). PART B (From Figure 4.4.1.1) Aircraft Structure Building Block Structural Development Test Effort Aircraft Structure Development Goals Trade Studies and Conceptual Development Analysis Selection and Proof of Concept Testing and Analytical Methods Development Classification Description Element - Single Load Path Sub-Component - Multiple Load Paths (Including Joints) PRIMARY CARRIES PRIMARY AIR LOADS Concept and analytical methods development - static and fatigue test (optional) Proof of concept and analytical methods - static and fatigue test (residual strength) • Fracture critical (F/C) • Failure will cause loss of vehicle 3 - each stiffening configuration 3 - each joint configuration 1 box beam/cylinder: static ultimate 1 box beam cylinder: fatigue and residual strength • Noncritical (N/C) • Failure will not cause loss of vehicle 1 - each stiffening configuration 1 - each joint configuration 1 box beam/cylinder: static ultimate SECONDARY CARRIES SECONDARY AIR & OTHER LOADS Concept and analytical methods development - static and fatigue test Proof of concept and analytical methods - static (DLL/fatigue/ residual strength test) • Fatigue critical (FA/C) & economic life critical (EL/C) • Failure will not cause loss of vehicle but may cause cost critical parts replacements 2 - each stiffening configuration 2 - each joint configuration 2 box beam/cylinder: static (DLL/fatigue/residual strength test) • Noncritical (N/C) • Failure will not cause loss of vehicle • No cost or fatigue critical parts 1 - each stiffening configuration 1 - each joint configuration No testing required - proved by element tests NONSTRUCTURAL NON- OR MINOR LOAD BEARING Concept development/static test/ analytical methods check Proof of concept: element testing plus analysis • Noncritical (N/C) • Failure/replacement of parts causing minor inconvenience, not cost critical 1 - each most critical configuration No testing required - proved by element tests and analysis