Layer- and position-specific characterization of the fracture behavior of the small intestine

value of the mucosal layer is approximately four times higher than that of the muscular layer (1-2 N/mm), while the serosal layer has the highest values, reaching 6-10 N/mm. Additionally, the fracture behavior of the combined muscular and serosal layers of the duodenum, jejunum and ileum can be explained by classical laminate theory. However, the results of the entire wall indicate complicated interlayer behavior between the mucosal and muscular layers. Furthermore, the crack-tip tracking method and local deformation obtained from optical measurements help achieve a clearer understanding of crack initiation and propagation. These results provide a comprehensive dataset about the failure characteristics of the SI that can be used as input or for validating failure models in the future. Statement of Significance: This study is the first to report on experiments involving the failure of the porcine small intestine. The study investigates the region-, orientation-, and layer-specific mechanical properties of the small intestine in order to gain insight into its behavior under intact and failed conditions. Although layer-specific experimental studies are essential for a comprehensive understanding of small intestine function, they have received little attention to date. Additionally, this study examines crack propagation direction during uniaxial tensile tests. The study provides a unique database that improves our understanding of small intestine failure behavior and serves as a basis for corresponding models.