Dong Chengzhi, Li Kai, Jiang Yuxi, Arola Dwayne, Zhang Dongsheng
Opt Express. 2018 Jan 8;26(1):531-543. doi: 10.1364/OE.26.000531.
An optical system for measuring the coefficient of thermal expansion (CTE) of materials has been developed based on electronic speckle interferometry. In this system, the temperature can be varied from -60°C to 180°C with a Peltier device. A specific specimen geometry and an optical arrangement based on the Michelson interferometer are proposed to measure the deformation along two orthogonal axes due to temperature changes. The advantages of the system include its high sensitivity and stability over the whole range of measurement. The experimental setup and approach for estimating the CTE was validated using an Aluminum alloy. Following this validation, the system was applied for characterizing the CTE of carbon fiber reinforced composite (CFRP) laminates. For the unidirectional fiber reinforced composites, the CTE varied with fiber orientation and exhibits anisotropic behavior. By stacking the plies with specific angles and order, the CTE of a specific CFRP was constrained to a low level with minimum variation temperature. The optical system developed in this study can be applied to CTE measurement for engineering and natural materials with high accuracy.
基于电子散斑干涉术开发了一种用于测量材料热膨胀系数（CTE）的光学系统。在该系统中，利用珀耳帖器件可将温度在-60°C至180°C之间变化。提出了一种特定的试样几何形状和基于迈克尔逊干涉仪的光学装置，以测量由于温度变化引起的沿两个正交轴的变形。该系统的优点包括在整个测量范围内具有高灵敏度和稳定性。使用铝合金对估计CTE的实验装置和方法进行了验证。在此验证之后，该系统被用于表征碳纤维增强复合材料（CFRP）层压板的CTE。对于单向纤维增强复合材料，CTE随纤维取向而变化，并表现出各向异性行为。通过以特定角度和顺序堆叠铺层，特定CFRP的CTE被限制在较低水平且温度变化最小。本研究中开发的光学系统可高精度地应用于工程材料和天然材料的CTE测量。
