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碳纤维复合材料自行车前叉冲击-疲劳测试的声发射研究
Acoustic emission study on impact-fatigue test of carbon fiber composite bicycle front fork
投稿时间:2022-02-13  修订日期:2022-05-04
DOI:
中文关键词:  碳纤维复合材料  自行车前叉  声发射  冲击-疲劳测试  损伤破坏机制
英文关键词:Carbon fiber composite  Bicycle front fork  Acoustic emission  impact-fatigue test  Damage mechanism
基金项目:
作者单位邮编
武梦雅 北京化工大学 碳纤维及功能高分子重点实验室 100029
刘云芳 北京化工大学 碳纤维及功能高分子重点实验室 100029
李鹏 北京化工大学 材料科学与工程学院 100029
李风 中国石化胜利油田技术检测中心 257000
张瑾 中国石化胜利油田技术检测中心 257000
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中文摘要:
      为建立碳纤维复合材料自行车前叉的可靠性检测评价体制,采用声发射(AE)设备对模压成型工艺制备的前叉在冲击-疲劳试验中损伤萌生和扩展的过程进行了研究。首先,对前叉进行落锤冲击以模拟在役中产生的缺陷,然后采集其循环加载疲劳试验过程中的AE撞击数、峰值振幅、持续时间等声发射信号,并通过AE线性定位图判断材料内部损伤产生的位置,利用AE频域波形FFT图分析损伤特征。结果显示:落锤冲击载荷下,前叉会产生基体开裂、分层等微观损伤,且发生在前叉叉骨部位;在疲劳试验中,前叉的损伤破坏经历了初始阶段、平稳扩展期和最终阶段,分别出现基体破坏(60-80 dB、110-175 kHz)、界面分层(80-90 dB、220-260 kHz)、纤维破坏(90-100 dB、300-375 kHz)等损伤模式,呈渐进性增长。当AE峰值振幅和能量达到100 dB和7.73×1010 eu时,38.89%的碳纤维发生断裂,导致前叉彻底失效。研究结果表明,AE参数可以很好地描述复合材料的冲击-疲劳过程中损伤的形成与发展,既能为碳纤维自行车前叉部位的结构设计提供数据支持,也能为在役前叉部件的健康状态进行监测评价,从而便于采取及时的修复工作。
英文摘要:
      In order to establish the reliable evaluation system for bicycle front fork made of carbon fiber composite, acoustic emission (AE) equipment was used to investigate the damage initiation and propagation of the front fork prepared by molding process during impact-fatigue test. Firstly, the front fork was subjected to drop hammer impact and cyclic loading fatigue tests, which simulates the the possible impact in service. The AE hit numbers, peak amplitude, duration and other parameters were collected during the test process. Furthremore, AE linear location maps were used to locate the position of internal damage, while the FFT diagrams of AE frequency domain waveform were used to analyze the damage characteristics. The results show that the matrix cracking and delamination would occur in the part of the wishbone under the impact load of falling hammer. During the fatigue test, the damage has experienced initial stage, smooth extension stage and final stages, which correspond to the matrix failure (60-80 dB, 110-175 kHz), interfacial stratification (80-90 dB, 220-260 kHz) and fiber failure (90-100 dB, 300-375 kHz), respectively. The results show the slowly cumulative failure form. When the peak amplitude and energy of AE reach to 100 dB and 7.73×1010 eu, 38.89% of carbon fibers are borken and the front fork will be completely damaged. It is suggested that AE parameters could well describe the formation and development of damage of carbon fiber composite in the impact-fatigue process. This research could not only provide basic support for the structural design of the front fork of carbon fiber bicycle but also monitor the health status of in-service front fork components, and repair the damaged parts of materials in time.
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