Observation of the heat exchange during deformation using an infra-red camera
Observation of the heat exchange during deformation using an infra-red camera
复制标题
使用红外相机观察变形过程中的热交换
DOI：
10.1016/0032-3861(92)90685-p
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发表时间：
1992
期刊：
影响因子：
4.6
通讯作者：
J. Koenen
中科院分区：
文献类型：
--
作者：
J. Koenen
用红外光谱仪观察了聚碳酸酯在形变过程中的颈缩过程。相机在校准i.r.通过使用照相机和确定样品的发射率，可以将热图像转换为温度图像。计算，包括热源和热损失的热传导方程的基础上，产生的测量温度模式的定量描述，因此，由颈缩过程中产生的热量。通过与拉伸量热计的实验进行比较，对该方法进行了检验。能量、热量和功的总平衡可以作为拉伸速率的函数来测量。观察到从低应变率下的内能增加到高颈速下的内能不变（所有功都转化为热）的过渡。
The necking process during deformation of polycarbonate was observed with an infra-red (i.r.) camera. After calibration of the i.r. camera and determination of the emissivity of the sample, it is possible to transform the thermal image into a temperature image. Calculations, based on the heat conduction equation including heat sources and heat loss, yield a quantitative description of the measured temperature pattern and therefore the heat produced by the necking process. The method was checked by comparison with experiments done with a stretching calorimeter. The total balance of energy, heat and work could be measured as a function of the stretching rate. A transition from an increase of internal energy at low strain rates to an unchanged internal energy—all work is converted into heat—at high neck velocities is observed.