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这里提供一种测试应变的新方法,试件温度由室温至少到3000K,并且经过鉴定。本系统用于研究材料(由自身阻抗加热)短时间(秒到分)和高温力学特性中的应变测试,而且系统具有通用性。在技术上,由计算式线扫描照相机跟踪试件上两个小的陶瓷—粘合剂靶。小靶由激光照明,光线通过窄带(1毫微米)干涉滤光器而消除试件热辐射的影响。对不锈钢和石墨分别在1477K 和3000K 范围内进行了实验。在有透镜的装置中,应变测试系统的最大位移范围为4.24毫米,在室温以上的综合误差为±4.14微米。本系统的特点是:(1)在跟综范围内,对光线强度变化的敏感性显著降低;(2)这是一个动态测试系统,可以在加热过程中和短时间范围内使用;(3)球粒(nodule)稳定,对实验结果没有不利的影响;(4)系统可靠且易于使用。
Here is a new way to test the strain, the specimen temperature from room temperature at least to 3000K, and identified. The system is used to study the strain testing of materials (heated by their own impedance) for a short time (seconds to minutes) and high temperature mechanical properties, and the system is versatile. Technically, two small ceramic-adhesive targets are tracked on the specimen by a computational line-scan camera. The small target is illuminated by a laser and the light is passed through a narrowband (1 nm) interference filter to eliminate the effects of thermal radiation from the test piece. Experiments were conducted on stainless steel and graphite at 1477K and 3000K, respectively. In lens-mounted devices, the strain measurement system has a maximum displacement of 4.24 mm and a combined error of ± 4.14 μm above room temperature. (2) This is a dynamic test system that can be used during the heating process and within a short period of time. (3) The system has the following features: The nodules are stable and have no adverse effect on the experimental results; (4) The system is reliable and easy to use.