The nonlinear shear of resin in fiber reinforced plastic composites is a plastic feature that cannot be ignored. Some materials scientists were often stuck on how to in situ characterize accurately shear nonlinear property of the modified resin in the composite. In this paper we try to solve this problem. Firstly, we adopted DIC method to measure the full-field shear strain; secondly we adopted a Ramberg–Osgood constitutive to quantize accurately the modification effect on shear properties by nanoparticles. Finally, we conducted many modification experiments with common nanoparticles (poly aryl ether ketone, nano-silica, and multi-walled carbon nanotubes, MWCNTs: 12 cases) to verified that the method we proposed is simple and effective to conduct for materials scientist without the esoteric mechanical reserve. In addition, the quantization will facilitate researchers engaged in finite element analysis with several experimental data references for related simulation-based research.

纤维增强塑料复合材料中树脂的非线性剪切是不可忽视的塑性特性。一些材料科学家经常被困在如何原位准确表征复合材料中改性树脂的剪切非线性特性上。在本文中，我们试图解决这个问题。首先，我们采用DIC方法测量全场剪切应变；其次，我们采用 Ramberg-Osgood 本构来准确量化纳米粒子对剪切性能的修饰效果。最后，我们对常见的纳米粒子（聚芳醚酮、纳米二氧化硅和多壁碳纳米管，MWCNTs：12 个案例）进行了许多改性实验，以验证我们提出的方法对于材料科学家来说是简单有效的，无需深奥的机械储备。此外，