TINASSA
ThIN-walled Aircraft Structures Stress Analysis
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• TINASSA (ThIN-walled Aircraft Structures Stress Analysis) is the developed tool that analyzes a cross-sectional area of a skin stringer structure under applied load, moment, and torque.
Technical Knowledge
Technical Knowledge
Structure Idealization (Boom Area)
Centroid and Second Moment of Area
Normal Stress at Boom Areas
Shear Stress due to Direct Stress and Torque
Shear Flow due to Direct Stress and Torque
Combined Shear Stress at Panels
Margin of Safety Calculation
Softwares
Softwares
Excel
Microsoft Office Suite
Microsoft Teams
Skills
Skills
Problem Solving
Attention to Detail
Time Management
Work Under Pressure
Easy to Work in Team
Decision Making
TINASSA Home Page with Steps
TINASSA Calculation Workflow
TINASSA (Version 1.0)
• Based on the inputs user will provide, TINASSA will deliver the following outputs:
Idealized Boom Area, Centroidal Location of idealized section, Second moment of area of the idealized section, Graphical representation of idealized boom area, Direct Stress at each boom, Shear stress in each skin panel due to direct shear, Shear stress in each skin panel due to torque, Combined shear stress in each skin panel, Margin of Safety Stringer and Panel
• The challenge in calculating the direct stress in case of a unsymmetrical skin/stringer cross-section with moments applied in both horizontal and vertical planes is that the values of the second moments of inertia are unknown since they are derived from the boom area that is calculated simultaneously. TINASSA’s solution introduces a loop between the sectional properties, the moments of inertia, and the boom area calculation which results in an iterative process from an initial guess for the boom area to a converged value with respect to the section properties input.
• In industry, TINASSA can be a valuable tool since it reduces the modelling and analysis time on Finite Element modelling softwares by providing the user the end-loads and shear loads generated by the FEM which are further incorporated in other stress tools to analyze the stability and buckling in the structure.
TINASSA (Version 2.0)
• Buckling of Skin and Spar Web calculations with diagonal tension consideration added alongside with the Crippling of the Stringers calculation
• Material Properties Appendix and Z Stringer design guide with high design efficiency
• Margin of Safety Summary Table with auto critical MS and mode of failure detection
• Weight Breakdown of the Structure
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