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Comparison between 0D and 1D approaches for mechanical dissipation measurement during fatigue tests
Strain ( IF 2.1 ) Pub Date : 2019-02-27 , DOI: 10.1111/str.12307
Pawarut Jongchansitto 1 , Corentin Douellou 2 , Itthichai Preechawuttipong 1 , Xavier Balandraud 2
Affiliation  

Fatigue in materials is generally associated with the production of heat, leading to the “self‐heating” of the tested material. The associated heat power density, named mechanical dissipation or intrinsic dissipation, can be deduced from the temperature changes captured on the tested specimen's surface by infrared thermography. When mechanical dissipation is spatially homogeneous in the tested specimen, the processing can be performed using a macroscopic approach, also named zero‐dimensional (0D) approach. The latter uses an averaged temperature over the whole specimen's measurement zone. The present study aims to analyse the error generated by the 0D approach in the assessment of mechanical dissipation. This error was measured with respect to a one‐dimensional (1D) approach, which is applicable for longitudinal specimens subjected to uniaxial loading. Experimental tests were performed on pure copper and acrylic glass. A model was also developed to analyse the influence of the material and of the heat exchanges with the specimen's environment. The results obtained show that the error generated by the 0D approach in mechanical dissipation measurement may not be negligible and that attention should be paid to the choice of approach for fatigue analysis.

中文翻译:

疲劳测试期间机械耗散测量的0D和1D方法之间的比较

材料疲劳通常与热量产生有关,导致被测材料“自热”。相关的热功率密度,称为机械耗散固有耗散可以通过红外热像仪从被测样品表面捕获的温度变化推导出。当被测样品的机械耗散在空间上是均匀的时,可以使用宏观方法(也称为零维(0D)方法)进行处理。后者使用整个样本测量区域的平均温度。本研究旨在分析由0D方法产生的误差,以评估机械耗散。相对于一维(1D)方法测量了此误差,该方法适用于承受单轴载荷的纵向样本。在纯铜和丙烯酸玻璃上进行了实验测试。还开发了一个模型来分析材料的影响以及与样品环境之间的热交换。
更新日期:2019-02-27
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