This lesson covers the process of understanding and developing governing equations for shell structures, with a focus on first-order shear deformation theory. It explains how to interpret research articles on the subject, using a recent paper on the semi-analytical analysis of strength and critical buckling behavior of underwater ring stiffened cylindrical shells as an example. The lesson also provides a step-by-step guide on how to write a code for shell cases, including the transformation of material properties and the calculation of stiffness coefficients. It further discusses the importance of non-dimensionalisation and the use of MATLAB for coding.

- Understanding the basic definition of differential geometry is crucial for developing shell equations.
- The first-order shear deformation theory is used to develop a partial differential set of governing equations.
- Research articles can be understood better by relating them to the basic governing equations.
- Writing a code for shell cases involves several steps, including defining the length and width of the shell, calculating the compliances, and transforming the material properties.
- Non-dimensionalisation is a critical concept in coding, which helps in managing large numbers and ensuring the accuracy of results.

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