MODELS FOR ESTIMATING THE AUTOFRETTAGE PRESSURE AND RESIDUAL STRESSES IN WALLS OF TYPE 2 PRESSURE VESSELS

Conference · Mon Jul 17 04:00:00 EDT 2023

OSTI ID:2478385

Saxena, Ashok ^[1]

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1. WireTough Cylinders, LLC; WireTough Cylinders. LLC

Autofrettage is a manufacturing process used during fabrication of Type 2 pressure vessels designed for usage at high pressures to enhance the fatigue life. The process locks high compressive residual stresses in the vessel’s liner wall that reduce the maximum and the mean stress during service loading. To achieve a consistent residual stress profile across the wall of the vessel, the choice of autofrettage pressure is critical. Several finite element analyses runs were conducted to estimate the correct autofrettage pressure that is a function of the yield strength of the liner material, the wall thickness, and the outside diameter of the liner for a wrap thickness of 17.06 mm (48 wire layers). From the finite element analyses results, models were developed to estimate the correct autofrettage pressure and the residual stress distribution across the liner wall as a function of the yield strength of the liner material, the wall thickness, and the outside diameter of the liner.

• Research Organization: WireTough Cylinders, LLC
• Sponsoring Organization: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Heavy Vehicle Technologies (EE-33); USDOE Office of Procurement, Assistance and Program Management (PR); USDOE Pittsburgh Energy Technology Center (PET)
• Contributing Organization: WireTough Cylinders, Siemens Technology Center
• DOE Contract Number: FE0032022
• OSTI ID: 2478385
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
Autofrettage
Hydrogen Storage Vessel
Residual Stresses