|Table of Contents|

Study on analysis method of small crack growth in random vibration fatigue test(PDF)

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

Issue:
2021年02期
Page:
68-75
Research Field:
研究与设计
Publishing date:

Info

Title:
Study on analysis method of small crack growth in random vibration fatigue test
Author(s):
ZHANG Yuntao; SONG Shaowei; WANG Jun
Science and Technology on Liquid Rocket Engine Laboratory, Xi'an 710100,China
Keywords:
random vibration fatigue;  small crack;  fatigue stress spectrum;  crack growth rate curve;  crack growth calculation
PACS:
V434.3
DOI:
-
Abstract:
According to the random vibration fatigue test of the pipeline joint in a liquid rocket engine, the crack propagation analysis was carried out based on the small fatigue crack theory of fracture mechanics.The calculation of small crack stress intensity factor, fatigue strain/stress spectrum, crack growth rate curve and crack growth calculation program were studied, respectively.FRANC3D(trial version)was used to perform the finite element calculation of three-dimensional crack, and the variation law of stress intensity factor on the surface crack of pipeline structure was obtained.Rain-flow cycle counting method was used to count the measured strain date, and the stress cycle spectrum block for crack growth calculation was formed.Then, time-domain distribution characteristics of the cyclic strain peak and amplitude in fatigue test were studied.Newman crack closure theory was used to modify the NASGRO crack growth rate curve of long cracks, and the relevant parameters of the test sample material were given.Finally, an average loading method of fatigue stress spectrum block was used to quickly calculate the crack growth life.Compared with the experimental results, the calculation method is effective and reliable.

References:

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