Research on the Fatigue Strength of Brazed Joints in Gas-Wave Refrigerator Oscillating Tubes Based on Cohesive Zone Model

Gas-wave refrigerators are widely used devices that utilize gas pressure to produce wave motion inside an oscillating tube for high-power refrigeration. This paper manufactures the core component of gas-wave refrigerators—the oscillating tubes—using hub and blade brazing. The tensile strength and fa...

Full description

Saved in:
Bibliographic Details
Published inApplied sciences Vol. 14; no. 19; p. 8723
Main Authors Zhang, Yongle, Xing, Aidong, Sang, Cheng, Li, Qingsheng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.10.2024
Subjects
Alloys
Aluminum
brazed joints
cohesive zone model
Composite materials
Copper
Crack initiation
Crack propagation
Fatigue
fatigue life
Fatigue testing machines
Materials
Metal fatigue
Natural gas
Propagation
Refrigerators
Stainless steel
VUMAT subroutine
Online AccessGet full text

Cover

More Information
Summary:Gas-wave refrigerators are widely used devices that utilize gas pressure to produce wave motion inside an oscillating tube for high-power refrigeration. This paper manufactures the core component of gas-wave refrigerators—the oscillating tubes—using hub and blade brazing. The tensile strength and fatigue life of the brazed joints were obtained through experiments. A finite element simulation based on the cohesive zone model determined that the critical damage stress of the brazed-joint brazing seam was 525 MPa. Under cyclic displacements of U = [0.4 mm, 0.5 mm, 0.6 mm], the errors between the simulated and experimental values of fatigue life are 9.09%, 4.38%, and 4.44%, respectively, which verifies the accuracy of the VUMAT subroutine of the cyclic CZM. The fatigue life relationship formula for the butt-brazed joints was fitted as y=5458.97x−3.545. Through the simulation analysis of the impact of the butt-joint angles on the fatigue life of brazed joints, it was found that as the butt-joint angle increased, the fatigue damage decreased, and the fatigue life increased. A finite element model of an oscillating tube with a DN (Nominal Diameter) of 285 × 450 mm was established to analyze the fatigue life of the butt-brazed structure of the rotor blade. The fatigue life of the brazed structure with a butt-joint angle of α = 45° increased by over 102.92% than that of α = 0°.
ISSN:2076-3417
2076-3417
DOI:10.3390/app14198723