Quantitative visualization of the full-field stress and strain in porous structures is of significance to reveal the mechanism of the damage and failure of engineering materials. To quantitatively characterize the full-field stresses and strains, optical measurement methods, such as photoelasticity for determining the stress fields, moiré and digital image correlation (DIC) methods for measuring the strain fields, have been developed in previous works. However, it is challenging to combine these methods to measure stress and strain fields simultaneously because the speckles and gratings for strain measurement will disturb the interference fringes in the photoelasticity. In this study, a method incorporating photoelasticity and DIC techniques was developed to determine the stress and strain fields simultaneously in different porous structures which were fabricated by three-dimensional (3D) printed technique. The tested models were printed with a highly transparent, colourless material and the speckles on the front surface of the tested models were printed with a translucent, magenta material. Under compressive loads, the stress fields in these models were obtained based on the photoelastic patterns and the strain fields were determined by DIC method. The results indicate the proposed method can simultaneously determine the full-field stresses and strains and the comparison of the distribution of the principal stress and strain difference and the distribution of the shear stress and strain verified its good accuracy. In addition, the stress and strain distribution in different pore structures were compared and found that the optimal design of the pore distribution can greatly change the concentration of the stress and strain fields.

多孔结构全场应力应变的定量可视化对于揭示工程材料损伤失效机理具有重要意义。为了定量表征全场应力和应变，在以前的工作中已经开发了光学测量方法，例如用于确定应力场的光弹性、摩尔纹和用于测量应变场的数字图像相关 (DIC) 方法。然而，将这些方法结合起来同时测量应力和应变场是具有挑战性的，因为用于应变测量的斑点和光栅会干扰光弹性中的干涉条纹。在这项研究中，开发了一种结合光弹性和 DIC 技术的方法，以同时确定通过三维 (3D) 打印技术制造的不同多孔结构中的应力和应变场。测试模型使用高度透明的无色材料印刷，而测试模型正面的斑点则使用半透明的洋红色材料印刷。在压缩载荷下，这些模型中的应力场是基于光弹性模式获得的，应变场是通过 DIC 方法确定的。结果表明，该方法可以同时测定全场应力应变，主应力应变差分布与剪应力应变分布的对比验证了其良好的精度。此外，