Structural analysis of a Cirrus SR22 wing box through classical FEM and CUF

Sep 17, 2026

Uploaded by Fans

This master’s thesis investigates the structural integrity of the Cirrus SR22 central wing box using both the Carrera Unified Formulation (CUF) and Abaqus. The work introduces the aircraft and the wing box’s structural role, then evaluates isotropic and composite material behavior under relevant conditions. The core analysis applies CUF within the finite element method, contrasting it with traditional FEM through accuracy and computational efficiency. Failure is assessed with Tsai-Wu and Maximum Stress criteria and failure indices to identify likely weak points.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages89

Reading Time3 h 44 min

AccessFree to download

1 Introduction

1.1 Cirrus SR22 Aircraft

1.2 Central Wing Box

1.3 Materials and Model used in thesis

1.4 Overview of CUF

1.5 Overview of failure index

2 Carrera Unified Formulation and Failure analysis

2.1 Governing equations in matrix form

2.2 Carrera Unified Formulation approach

POLITECNICO DI TORINO Master’s Degree in Mechanical Engineering Master’s Degree Thesis Structural analysis of a Cirrus SR22 wing box through classical FEM and CUF Supervisors Prof. Matteo Filippi Candidate Deepak Nelmangala Chandrashekhar Prof. Marco Petrolo Prof. Dario Magliacano October 2024 Summary This thesis explores the structural analysis of the central wing box of the Cirrus SR22 aircraft using both the Carrera Unified Formulation (CUF) and Abaqus software. The Cirrus SR22 is a widely respected single-engine aircraft, known for its composite construction and the integration of critical components such as the central wing box, which plays a pivotal role in the aircraft’s structural integrity. The central wing box is essential for connecting the wings to the fuselage and supports the forces generated during flight, making it a critical focus for analysis. The study begins by introducing the Cirrus SR22, detailing its design and the importance of the central wing box. It then discusses the materials used in the wing box, including isotropic and composite materials, which are evaluated for their performance under various conditions. The thesis emphasizes the significance of material selection in aerospace applications, where the balance between weight, strength, and durability is crucial for optimizing aircraft performance. The core of the thesis is dedicated to the application of CUF, a powerful and versatile approach within the Finite Element Method (FEM) . CUF is highlighted for its ability to handle complex geometries and material behaviours, particularly in the context of advanced aerospace materials like composites. The study contrasts CUF with traditional FEM methods, showing how CUF’s use of higher-order polynomial expansions leads to more accurate and computationally efficient analyses, particularly for structures like the central wing box. Failure analysis is also a key component of the thesis, where different failure criteria, such as the Tsai-Wu and Maximum Stress Criteria, are applied to predict the onset of failure in composite materials. The integration of failure indices into the analysis enhances the understanding of potential weak points in the structure, which is critical for ensuring the safety and reliability of the aircraft. Overall, this thesis provides a comprehensive analysis of the central wing box, demonstrating the effectiveness of CUF and Abaqus in evaluating the structural integrity and failure potential of this critical component. The findings contribute valuable insights into the design and optimization of aerospace structures, with implications for improving the performance and safety of modern aircraft. Acknowledgements I would like to express my deepest gratitude to God, whose grace and guidance have sustained me throughout this journey and to all those who have supported me throughout this journey, which has culminated in the completion of this thesis. First and foremost, I am profoundly thankful to my supervisor, Professor Matteo Filippi, whose guidance and support have been invaluable. His expert advice and encouragement provided me with the confidence to pursue and refine my research ideas. I am grateful for the countless hours he spent reviewing my work and for his dedication to my academic and professional development. I also extend my sincere thanks to my co-supervisors, Professor Dario Magliacano and Professor Marco Petrolo. Professor Magliacano, in particular, has played a pivotal role in my research. His insightful feedback and unwavering dedication to my progress laid a solid foundation for this thesis. He was always available to offer his expertise, whether through detailed discussions or quick clarifications. His ability to challenge my thinking while offering constructive advice significantly shaped my academic growth. I am profoundly grateful for his mentorship, which has been instrumental not only in the completion of this thesis but a

FAQs

What structural component is analyzed in the thesis?

The thesis focuses on the central wing box of the Cirrus SR22 aircraft and its structural integrity under loading.

Which analysis methods and tools are compared?

The study applies Carrera Unified Formulation (CUF) and uses Abaqus, contrasting CUF-based results with classical finite element method approaches.

How is failure onset predicted for composite materials?

Failure analysis applies failure criteria such as Tsai-Wu and Maximum Stress, integrating failure indices to predict the onset of failure and highlight potential weak points.

Sep 17, 2026

Uploaded by Fans