The paper examines finite element modeling of a portion of the cylindrical shell of a cryogenic liquid hydrogen tank using the ANSYS software package. The objective is to analyze the stress-strain state of the cylindrical shell with a heat-protective coating during tank cooldown. The study is conducted on a transversely composite ring element, which represents a portion of the cylindrical shell. The finite element model of this ring consists of two solid rings (a supporting metal ring and a foam ring) between which there is ideal frictionless one-way contact, defined in the software package as Frictionless. Both solid rings have a finite element mesh constructed from eight-node SOLID225 parallelepiped finite elements. This type of finite element allows for simultaneous calculations for two different physical processes. First, the temperature and heat flux fields are determined. Then, based on the obtained results, thermal deformations are determined in accordance with mechanical loading and kinematic boundary conditions. The clamping scheme of the transversely composite ring simulates the deformation of a portion of the cylindrical shell of a tank. Therefore, both layers at one end are rigidly secured against axial movement and rotation, while at the other end, each layer of the composite structure remains flat and perpendicular to the ring axis. The inner surface of the composite ring is cooled from 293K to 20K, while convective heat exchange with the environment occurs on the outer surface, taking into account a constant internal pressure of 0.1 MPa. The calculation results show that delamination of the transversely composite structure occurs due to large thermal deformations exceeding those caused by internal pressure.

EDN  VWGKLM