|Table of Contents|

Study on mechanical properties of aluminum gasket and its effect on stress distribution of typical connection structure(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2020年02期
Page:
77-84
Research Field:
研究与设计
Publishing date:

Info

Title:
Study on mechanical properties of aluminum gasket and its effect on stress distribution of typical connection structure
Author(s):
LIU Yitong1;  TANG Liang2;  LI Luxian1
(1.State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace,Xi’an Jiaotong University, Xi’an 710049, China; 2.Chinese People’s Liberation Army 96901,Beijing 100089,China)
Keywords:
connection structure;  aluminum gasket;  mechanical property;  finite element method
PACS:
V434.21
DOI:
-
Abstract:
Tenon-mortise and gasket joint is a frequently used pipeline connection structure for liquid rocket engine, and its long-term storage sealing performance plays an important role in engine reliability.The sealing property of this structure depends on the stress distribution in the sealing zone.This paper starts with the main sealing component in the connection structure of aluminum gasket, and studies its mechanical properties and their effect on the stress distribution in the sealing zone.Firstly, the mechanical performance test of L4 aluminum gasket material was carried out, and its constitutive relation was established.Secondly, the creep test of L4 aluminum was conducted at room temperature and 200 ℃, so as to establish a time-hardening type creep model of aluminum gasket.Finally, Abaqus finite element software was used to calculate the stress distribution of gasket under the prestressing moment of 5～25 N·m, and obtain the relationship between the contact pressure of gasket sealing surface and time.The calculation results show that the stress distribution of gasket is closely related to the pre-tightening moment; the creep characteristic of L4 Al will cause the contact pressure of gaskets sealing surface to relax with time, which is a significant risk of structure leakage.

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Last Update: 2020-04-25