A new model for fatigue life prediction based on infrared thermography and degradation process for CFRP composite laminates
A new model for fatigue life prediction based on infrared thermography and degradation process for CFRP composite laminates
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DOI：
10.1016/j.ijfatigue.2018.11.002
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发表时间：
2019-03-01
影响因子：
6
通讯作者：
Gong, X. J.
中科院分区：
文献类型：
--
作者：
Huang, J.;Pastor, M. L.;Gong, X. J.
在本文中，结合红外热成像（IRT）相机测量的刚度退化和温度变化，提出了一种新的疲劳寿命预测方法。首先，采用改进的热成像法，利用稳定升温数据确定疲劳极限。在此基础上，提出了一个二参数模型来表征CFRP层合板的刚度随着循环次数的增加而下降。经过标定参数和归一化失效阈值刚度的计算，可以在很短的时间内获得整个S-N曲线。所提出的模型适用于文献中的三轴编织 CFRP 层压板的实验数据和我们的疲劳测试中获得的单向 CFRP 层压板的实验数据。结果表明，预测的S-N曲线与传统测试有很好的一致性。该模型的主要利益可列举如下： (i) 这是适用于不同材料的更通用的标准； (ii) 它有更多的物理感官； (iii)可以在短时间内确定复合材料的总S-N曲线。
In this paper, a new fatigue life prediction methodology is proposed by combining stiffness degradation and temperature variation measured by InfraRed Thermographic (IRT) camera. Firstly, the improved thermographic method is used to determine the fatigue limit by using the data of stabilized temperature rising. Following this, a two-parameter model is proposed to characterize the stiffness degradation of CFRP laminates with the increase of cycle numbers. After the calibration parameters and the calculation of the normalized failure threshold stiffness, the whole S - N curve can be obtained in a very short time. The proposed model is applied to both the experimental data of triaxially braided CFRP laminates from literature and those of unidirectional CFRP laminates obtained from our fatigue tests. Results show that predicted S - N curves have a good agreement with traditional tests. The principal interests of this model could be listed as follows; (i) it is a more general criterion applicable to different materials; (ii) it has more physical senses; (iii) it allows the determination of the total S-N curve for composite materials in a short time.