Mechanical behavior and fracture analysis of the cylindrical component of <scp>type‐III</scp> high‐pressure composite tanks

Abstract This study presents a broad investigation of the mechanical properties and fracture behavior of a type‐III high‐pressure composite tank, with an emphasis on the cylindrical section, which is critical for ensuring the safety and reliability of pressure vessels in various applications. The experimental methods included split disk tensile (SDT), curved compact tension (CCT), and pipe ring notched bending (PRNB) tests, which were used to evaluate the hoop tensile strength, fracture toughness, and critical internal pressure of the cylindrical section under different loading conditions. Finite element analysis was used to complement the experimental findings and predict the failure behavior of this section. The SDT test was performed on samples taken from the cylindrical portion of the pressure tank, and its strength and modulus of elasticity were determined. Using CCT and PRNB tests, the fracture toughness of the studied tank materials was found to be 36.90 and 35.73 MPa√m, respectively. The small difference between these results confirmed the reliability of the tests in determining fracture toughness. Analysis of critical internal pressure versus crack length in the cylindrical section emphasized the importance of crack detection and management for safe operation. Overall, this study provides valuable insights into the mechanical behavior and fracture characteristics of the cylindrical part of high‐pressure composite tanks, which can contribute to their design and performance for enhanced safety and reliability in various industrial applications. Highlights Determining the mechanical properties of the composite tank with the SDT test. Characterizing the fracture toughness with CCT and PRNB tests. FE analysis of fracture behavior of high‐pressure composite tank. Providing valuable insights to increase safety and reliability.