|Table of Contents|

Evaluation method of vibration fatigue life of structures considering size effect(PDF)

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

Issue:
2024年03期
Page:
75-82
Research Field:
目次
Publishing date:

Info

Title:
Evaluation method of vibration fatigue life of structures considering size effect
Author(s):
YANG Mao;  SHI Hanyang;  WANG Jun;  FAN Xun
National Key Laboratory of Aerospace Liquid Propulsion, Xi'an Aerospace Propulsion Institute, Xi'an 710100, China
Keywords:
vibration fatigue;  size effect;  life;  maximum likelihood;  crack initiation
PACS:
V41
DOI:
10.3969/j.issn.1672-9374.2024.03.008
Abstract:
In order to improve the evaluation precision of vibration life of key structure of liquid rocket engine under vibration environment, the size effect was introduced into vibration fatigue life analysis by using crack initiation characteristic volume hypothesis and dangerous volume subdivision series model, and the vibration fatigue volume life model was put forward, and its numerical model was established. Based on the vibration test data of key structural simulators, the small-scale vibration fatigue characteristic parameters of typical materials were identified, and the life data maximum likelihood of simulation and test was used to optimize the crack initiation characteristic length. The model was verified by the vibration fatigue test of the key structure simulators. It is found that for the two simulators, the distribution of vibration life of each load order covers the test data, and the average life of the original state is within 1.5 times the dispersion band of the test, and the improved state is within 2 times the dispersion band of the test. The accuracy and applicability of the method were proved.

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