Thermal Characterization of Anisotropic Materials at High Temperature Through Integral Methods and Localized Pulsed Technique
Thermal Characterization of Anisotropic Materials at High Temperature Through Integral Methods and Localized Pulsed Technique
复制标题
通过积分方法和局部脉冲技术对高温下各向异性材料进行热表征
DOI：
10.1007/s10765-013-1415-1
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发表时间：
2013
影响因子：
2.2
通讯作者：
A. Degiovanni
中科院分区：
文献类型：
--
作者：
Y. Souhar;B. Remy;A. Degiovanni
航空航天或能源工业中的新应用需要开发在高温下表现出高各向异性性能的新材料。它们的热特性需要开发特定的实验台。本文提出了一个新的实验，它允许人们在不需要真空的情况下，仅通过一个实验来估计正交各向异性材料在高温下的三个扩散系数。估计过程是非常快速和准确的，由于使用，一方面，积分变换，允许人们摆脱闪光能量的空间分布，另一方面，红外相机，提供了大量的实验数据。并且由于使用非线性参数估计和直接对温度场的傅立叶变换进行的估计，热通量刺激不再需要在时间上是狄拉克的。为了验证该方法和实验设备，测量进行Ti-6Al-4V合金从室温到。此外，特别注意的热耦合，可以出现之间的低传导材料和空气，并已建立了一个标准，以确定是否可以影响面内热扩散率的测量或没有。
New applications in aerospace or energy industries require the development of new materials at high temperature exhibiting high anisotropic properties. Their thermal characterization requires the development of specific experimental benches. In this article, a new experiment is presented which allows one to estimate through only one experiment the three diffusivities of an orthotropic material at high temperatures without the need of vacuum. The estimation procedure is very fast and accurate due to using, on the one hand, integral transforms that allows one to get rid of the spatial distribution of the flash energy, and on the other hand, an infrared camera that provides a large amount of experimental data. And thanks to the use of a nonlinear parameter estimation and estimations made directly on Fourier transforms of the temperature field, the heat flux stimulation is no longer necessary to be Dirac in time. To validate the method and the experimental facility, measurements were performed on a Ti–6Al–4V alloy from room temperature up to. In addition, particular attention has been paid to the thermal coupling that can appear between the low conducting materials and the air, and a criterion has been established to determine if the in-plane thermal diffusivity measurements can be affected or not.