## 4 Discussion  
As aeronautical engineers strive for continuous improvement in the performance and reliability of aircraft propulsion systems, a meticulous investigation into the localized stresses arising from thermal expansion becomes paramount [26, 27, 28]. In this study, advanced digitalization techniques were employed, utilizing CATIA modeling software and a 3D scanner, to evaluate the locations on the combustion chamber cabinet where temperature sensors are positioned. The principal aim was to assess the structural integrity of these pivotal areas under the thermal stresses encountered during operational conditions. The initial phase of the methodology involved the application of CATIA, a cutting-edge modeling software, to construct a digital representation of the combustion chamber. This digital twin not only facilitated a comprehensive analysis but also served as a foundational reference for subsequent evaluations. The incorporation of a 3D scanner into the experimental framework enabled the meticulous capture of intricate details of the actual component, ensuring precision and reliability in simulations (Figure 13). A comprehensive analysis of a digitalized turbojet engine was undertaken within a HyperMesh working environment. This platform facilitated the execution of finite element analysis and the simulation of the influence of thermal expansion on the combustion chamber shell. Valuable insights into the stresses induced at locations accommodating temperature sensors were obtained through the simulations. Following a careful examination of the outcomes, the conclusion is that no significant issues concerning structural integrity were disclosed within the modeled scenarios. The visualizations derived from the analysis serve to bolster the findings by presenting a clear depiction of stress distribution across the combustion chamber cabinet. These visualizations, deemed invaluable tools for engineers and researchers, offer insights into potential vulnerabilities and contribute to the refinement of design parameters. It is noteworthy that the analysis did not discern any critical issues, underscoring the robustness and reliability of the combustion chamber structure when subjected to thermal expansion. This positive outcome stands as a testament to the advancements in simulation technology, which enabled the precise replication of real-world conditions and the accurate assessment of structural responses. Figure 13: Orientation of the scanned surface. To establish transparent and reproducible procedural steps within the methodology, the utilization of visualization in the form of a flowchart was employed. The objective was to augment clarity and facilitate a more accessible comprehension of the process. In consideration of the intricacies inherent in the study, considerable effort was dedicated to the development of a detailed but generalized flowchart that encapsulates the fundamental steps inherent in the used approach (see Figure 14). This flowchart serves as a visual roadmap, outlining the sequential progression from initial digitalization using CATIA to the execution of thermal analysis within the HyperMesh environment. Each step was systematically documented, highlighting the integration of 3D scanner data and the critical parameters considered during analysis. The methodology is streamlined for future reference using a generalized flowchart, and collaboration is facilitated by presenting a concise overview of the research framework. The commitment to methodological rigor and scientific transparency is underscored by the visual representation, ensuring that the approach is accessible and reproducible for the broader scientific community. Figure 14: Methodology of 3D model creation. A comprehensive analysis of local stresses induced by thermal expansion in the combustion chamber cabinet of a turbojet engine is presented in this study.