Contact type electronic extensometer and non-contact video extensometer are nowadays two major strain measurement techniques in material mechanical property measurement.Both extensometers have entirely different measurement principles and respective advantages and disadvantages.A systematic performance comparison between an advanced video extensometer which is newly developed based on digital image correlation (DIC) method and a commercial contact type electronic extensometer is presented in this paper.Standard aluminum plate sample uniaxial tensile experiment was designed and carried out to quantitatively compare the longitudinal and transverse strain and Poisson's ratio measurement results obtained by using two kinds of extensometers.Comparison results show that both measured longitudinal strain results are relatively close.Contact type extensometer has slightly better precision,but the uncertainty of two kinds of extensometer is at the same order of magnitude.Taking into account of the convenient use of video extensometer,applicable measurement objects and wide range of measurement,video extensometer has broader application prospect.

层间剪切强度是评价复合材料层合板层间力学性能的一项重要指标.首先,按照ASTM D 2344开展了复合材料层合板短梁剪切试验,研究了CCF300/5228复合材料层合板层间剪切性能.其次,基于数字图像相关方法得到了不同载荷作用下层间全场位移和应变分布.最后,利用ABAQUS建立了复合材料层合板有限元模型,分析了复合材料层合板层间位移及应变分布,并与数字图像相关计算结果进行了对比.研究表明,数字图像相关方法试验结果与有限元分析结果具有较好的一致性.数字图像相关方法能够实时监测层合板层间应变分布,进而预测层间剪切破坏位置,为复合材料层间剪切性能研究提供有效的全场应变监测手段.