1.国家能源集团永州发电有限公司,永州 425000
2.沈阳飞机设计研究所,沈阳 110066
3.北京石油化工学院 材料科学与工程学院,北京 102627
4.大连理工大学 力学与航空航天学院,大连 116023
钱文新,男,1967年生,内蒙古乌拉特前旗人,高级工程师;主要研究方向为发电技术和安全生产;E-mail:16080094@ceic.com。
收稿:2024-09-08,
修回:2024-10-13,
纸质出版:2026-05-15
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钱文新,高维健,朱斌,等. 基于裂纹扩展代表体元模型的碳纤维复合材料低温界面强度测试方法[J]. 机械强度,2026,48(5):90-96.
QIAN Wenxin,GAO Weijian,ZHU Bin,et al. Cryogenic interface strength testing method for carbon fiber composite materials based on crack propagation representative volume model[J]. Journal of Mechanical Strength,2026,48(5):90-96.
钱文新,高维健,朱斌,等. 基于裂纹扩展代表体元模型的碳纤维复合材料低温界面强度测试方法[J]. 机械强度,2026,48(5):90-96. DOI: 10.16579/j.issn.1001.9669.2026.05.011.
QIAN Wenxin,GAO Weijian,ZHU Bin,et al. Cryogenic interface strength testing method for carbon fiber composite materials based on crack propagation representative volume model[J]. Journal of Mechanical Strength,2026,48(5):90-96. DOI: 10.16579/j.issn.1001.9669.2026.05.011.
目的
2
针对碳纤维复合材料在液氢等深低温环境下界面强度难以直接准确测试的问题,提出了一种基于裂纹扩展行为反演界面剪切强度的间接测试方法,旨在为低温复合材料结构的强度设计与可靠性评估提供支撑。
方法
2
首先,建立了纤维、基体与界面之间断裂能释放率关系的裂纹扩展代表体元模型;其次,通过开展T700/TDE-85M复合材料单向层合板在不同温度(-196~25 ℃)下的纵向拉伸试验,获取了断面形貌;然后,对裂纹扩展路径(包括偏转、穿透及其组合模式)的出现概率进行了统计分析;最后,基于上述模型与试验数据,反演推导获得了界面剪切强度。
结果
2
研究表明,该方法在-196~25 ℃温度范围内测得的界面剪切强度,与单丝拔出法的测试结果误差在±10%以内,验证了模型的有效性。同时发现,界面强度随温度降低而呈下降趋势,且低温环境下裂纹更倾向于发生界面偏转。
Objective
2
To address the challenge of directly and accurately measuring the interfacial strength of carbon fiber composites in cryogenic environments such as liquid hydrogen
an indirect testing method based on inverse identification of interfacial shear strength through crack propagation behavior was proposed
aiming to support the strength design and reliability assessment of cryogenic composite structures.
Methods
2
Firstly
a representative volume element model for crack propagation was established
characterizing the relationship of energy release rate among the fiber
matrix
and interface. Secondly
longitudinal tensile tests of the T700/TDE-85M composite unidirectional laminates were conducted at different temperatures (from -196 ℃ to 25 ℃) to obtain fracture surface morphologies. Then
the occurrence probabilities of crack propagation paths (including deflection
penetration
and their combination) were statistically analyzed. Finally
the interfacial shear strength was inversely identified based on the aforementioned model and test data.
Results
2
The research demonstrates that the interfacial shear strength measured by this method within the temperature range of -196 ℃ to 25 ℃ shows errors within ±10% compared to results from the single-fiber pull-out method
verifying the model's validity.Concurrently
it was found that the interfacial strength decreases with decreasing temperature
and cracks are more prone to interface deflection at low temperatures.
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