GH4169材料振动弯曲高周疲劳性能研究
High Cycle Fatigue Performance of GH4169 under Vibration Bending
杭超 1潘凯 2陈永辉 1燕群1
作者信息
- 1. 中国飞机强度研究所 强度与结构完整性全国重点实验室,西安 710065
- 2. 中国航空研究院,北京 100012
- 折叠
摘要
目的 开展镍基高温合金GH4169 材料的振动弯曲高周疲劳研究.方法 基于高频振动台和激光测振仪,搭建振动弯曲疲劳试验系统.设计 2 种不同固有频率的试验件,在疲劳试验中以试验件af值(尖部振幅与固有频率乘积)作为控制目标,分别采用成组试验法和逐级加载法研究2 种试验件的高周疲劳性能.结果 疲劳试验过程中,试验件af值的控制误差低于0.5%.随着疲劳循环数的增加,试验件的固有频率逐渐下降,且下降速度先慢后快.结论 基于成组试验法的试验结果建立的GH4169 材料的双参数af-N疲劳寿命关系,与逐级加载法的试验结果吻合较好,证明了af-N疲劳关系的准确性.
Abstract
The work aims to investigate the vibration bending high cycle fatigue(VBHCF)of nickel-based high temperature alloy GH4169.A specialized VBHCF test system was constructed based on a high-frequency vibration table and a laser vibrome-ter.This system accommodated test pieces designed with two distinct natural frequencies.During fatigue testing,the af value—a pivotal parameter derived from the product of the test piece's tip amplitude and natural frequency—was meticulously controlled as the primary focus.The VBHCF performance of both test pieces was investigated employing the group-testing and step-loading methodologies.The results indicated that the af value's error margin remained under 0.5%during the fatigue tests.Furthermore,as the number of fatigue cycles progressed,the test pieces'natural frequencies exhibited a characteristic decline,initially gradual and subsequently accelerating.In conclusion,the dual-parameter af-N fatigue life model for GH4169,formulated based on the exhaustive group-testing data,demonstrates remarkable congruence with the independent validation provided by the step-loading experiments.This robust correlation underscores the accuracy and validity of the proposed af-N fatigue model.
关键词
高频振动/高温合金/弯曲振动/固有频率/高周疲劳/寿命Key words
high frequency vibration/high temperature alloy/bending vibration/natural frequency/high cycle fatigue/life引用本文复制引用
基金项目
国家科技重大专项(J2019-IV-0010-0078)
出版年
2024
NETL
NSTL
万方数据