Finite strain theory is a framework used in the field of continuum mechanics to describe the behavior of materials undergoing large deformations. Unlike small strain theory, which assumes that deformations are infinitesimally small and uses linear approximations, finite strain theory accounts for significant changes in shape and size of materials. Key aspects of finite strain theory include: 1. **Large Deformations**: It is specifically designed to handle situations where the deformations are not minor and where geometric nonlinearity cannot be ignored.

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