一、前言在光弹性实验中,目前国内外广泛使用的模型材料是环氧树脂.用光弹性实验分析水工结构的应力时,常常要使用两种以上弹模值不同的模型材料,来模拟坝身和坝基岩体.配制这种弹模值不同的材料,国内普遍采用的方法有两种:一是在环氧树脂中加入不同量的塑化剂——304聚酯;二是改变环氧树脂中的固化剂——顺丁烯二酸酐的用量. I. Introduction In the photoelastic experiment, the model material widely used at home and abroad is epoxy resin.When the stress of hydraulic structure is analyzed by photoelastic experiment, two or more model materials with different modulus values ​​are often used to simulate Dam body and dam foundation rock.Combining this kind of elastic modulus of different materials, there are two commonly used methods in China: one is to add different amount of plasticizer - epoxy in epoxy resin; 304 is to change the ring Oxygen resin curing agent - the amount of maleic anhydride.