The use of optic measurements such as digital image correlation to take strain measurements of fibre-reinforced polymers bonded to a substrate has been on the increase recently. This technique has proven to be useful to fully characterize the bond behaviour between two materials. Although modern digital cameras can take high-definition photos, this task is far from simple due to the tiny displacements that need to be measured. Consequently, digital image correlation measurements lead to relative errors that, at an initial stage of the debonding process, are higher than those calculated close to the debonding of the fibre-reinforced polymer from the substrate. This study aims to evaluate and analyse the use of the digital image correlation technique on the bond between carbon fibre-reinforced polymer laminates and timber when subjected to a pull-out load consistent with fracture Mode II. To allow the quantification of the relative errors obtained from the digital image correlation measurements during the full debonding process, several strain gauges were used to measure the strains in the carbon fibre-reinforced polymer composite. The accuracy of the digital image correlation measurements is analysed by comparing it with those obtained from the strain gauges, which is a very well-established measuring technique. Another contribution of this study is to check the versatility of the digital image correlation measurements on a broader range of situations. To that end, several timber prisms were bonded with seven different bonding techniques with and without the installation of a mechanical anchorage at the carbon fibre-reinforced polymer unpulled end. The results showed that the digital image correlation technique was able to track the slips calculated from the strain gauge measurements until the debonding load, but after that, some difficulties to measure the displacements of the anchored carbon fibre-reinforced polymer-to-timber joints were detected. The digital image correlation technique also over predicted bond stresses when compared with those taken from the strain gauges, which led to bond–slip relationships with higher bond stresses.

近来，使用光学测量（例如数字图像相关）来测量结合到基底上的纤维增强聚合物的应变的用途正在增加。事实证明，该技术对于完全表征两种材料之间的键合行为非常有用。尽管现代的数码相机可以拍摄高清照片，但是由于需要测量的微小位移，该任务远非简单。因此，数字图像相关性测量导致相对误差，该相对误差在剥离过程的初始阶段要比在接近纤维增强聚合物从基底的剥离过程中计算出的相对误差要高。这项研究旨在评估和分析数字图像相关技术在承受与断裂模式II一致的拉拔载荷时碳纤维增强的聚合物层压板与木材之间的粘合力的使用。为了量化在完全脱胶过程中从数字图像相关性测量中获得的相对误差，使用了几个应变仪来测量碳纤维增强聚合物复合材料中的应变。通过将其与从应变仪获得的数字图像相关性测量的准确性进行比较，可以分析数字图像相关性测量的准确性，这是一种非常完善的测量技术。这项研究的另一项贡献是在更广泛的情况下检查数字图像相关性测量的多功能性。为此，使用和不使用机械锚固在碳纤维增强的聚合物未拉出端安装和不安装机械锚固器，通过七种不同的粘合技术将数个木质棱镜粘合在一起。结果表明，数字图像相关技术能够跟踪从应变仪测量值计算出的滑移，直至产生脱粘载荷，但此后，要测量锚固碳纤维增强的聚合物-木材接头的位移存在一些困难。检测到。与从应变仪获取的应力相比，数字图像相关技术还超出了预测的粘结应力，从而导致了粘结-滑动关系与较高的粘结应力。结果表明，数字图像相关技术能够跟踪从应变仪测量值计算出的滑移，直至产生脱粘载荷，但此后，要测量锚固碳纤维增强的聚合物-木材接头的位移存在一些困难。检测到。与从应变仪获取的应力相比，数字图像相关技术还超出了预测的粘结应力，从而导致了粘结-滑动关系与较高的粘结应力。结果表明，数字图像相关技术能够跟踪从应变仪测量值计算出的滑移，直至产生脱粘载荷，但此后，要测量锚固碳纤维增强的聚合物-木材接头的位移存在一些困难。检测到。与从应变仪获取的应力相比，数字图像相关技术还超出了预测的粘结应力，从而导致了粘结-滑动关系与较高的粘结应力。