Finite Element Investigation of Thermal Stress and Structural Optimization of Neck Tubes in Vertical Cryogenic Cylinders
Year: 2026
Type: article
Abstract: The neck tube is a critical load-bearing component in vertical cryogenic insulated cylinders, serving as the primary structural connection between the inner and outer vessels. Due to geometric discontinuities and extreme temperature gradients, the neck tube region is highly susceptible to thermal stress concentration and structural failure. This study presents a detailed thermal–structural finite element analysis of neck tubes in vertical cryogenic cylinders using ANSYS software. The effects of combined loading conditions—including internal pressure, self-weight, temperature difference, and lateral inertia load—are investigated for various neck tube geometries and height-to-diameter (H/D) ratios. Parametric studies are conducted to evaluate the influence of neck tube diameter, length, and reinforcement ring dimensions on the maximum Von Mises stress. The stress distribution characteristics and critical failure locations are identified, with particular emphasis on the reinforcement ring’s role in reducing stress concentration. The results provide optimized design guidelines for improving the structural safety and reliability of cryogenic insulated cylinders operating under severe thermal and mechanical conditions.
Authors: Suraj Sharma, Ajay Kumar Singh
Language: English
Subfield: Aerospace Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7128470943
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