The conventional digital image correlation (DIC) method is not readily applicable for testing creep and hysteresis in high strain polymeric materials at temperatures above room conditions due to the limited field-of-view of the camera and the difficulty associated with heating the specimen during loading. In this work, the previously developed scanner-based digital correlation (SB-DIC) method for in-plane displacement and strain measurement was extended to investigate creep and hysteresis in unfilled natural rubber at temperatures up to 65 °C. An enclosed loading rig was designed to load the rubber specimens both mechanically and thermally. Two cylindrical quartz heaters were used to apply constant heat to the rubber specimen at controlled temperatures during loading. Speckle patterns on the specimens were created artificially and images were acquired by scanning using a flatbed scanner at regular time intervals. The zero-normalized cross correlation criterion in the DIC algorithm was used to map strains up to 400 % due to creep and hysteresis. A series of creep experiments from 25 to 65 °C and hysteresis experiments from 25 to 55 °C were carried out to investigate the effect of temperature on creep and hysteresis in rubber. The full-field displacement vectors showed a rapid increase in creep strain above 35 °C. The hysteresis loops were also found to increase with temperature.

传统的数字图像相关 (DIC) 方法不容易适用于在高于室温的温度下测试高应变聚合物材料的蠕变和滞后，因为相机的视野有限，并且在加载过程中加热样品很困难. 在这项工作中，先前开发的用于平面位移和应变测量的基于扫描仪的数字相关 (SB-DIC) 方法扩展到研究未填充天然橡胶在高达 65 °C 的温度下的蠕变和滞后。一个封闭的加载装置被设计成以机械和热方式加载橡胶样品。两个圆柱形石英加热器用于在加载期间在受控温度下对橡胶样品施加恒定热量。标本上的散斑图案是人工创建的，图像是通过使用平板扫描仪定期扫描获得的。DIC 算法中的零归一化互相关标准用于绘制高达 400% 的应变，这是由于蠕变和滞后引起的。进行了一系列 25 至 65 °C 的蠕变实验和 25 至 55 °C 的滞后实验，以研究温度对橡胶蠕变和滞后的影响。全场位移矢量显示蠕变应变在 35°C 以上迅速增加。还发现滞后回线随温度增加。进行了一系列 25 至 65 °C 的蠕变实验和 25 至 55 °C 的滞后实验，以研究温度对橡胶蠕变和滞后的影响。全场位移矢量显示超过 35 °C 时蠕变应变迅速增加。还发现滞后回线随温度增加。进行了一系列 25 至 65 °C 的蠕变实验和 25 至 55 °C 的滞后实验，以研究温度对橡胶蠕变和滞后的影响。全场位移矢量显示超过 35 °C 时蠕变应变迅速增加。还发现滞后回线随温度增加。