The materials with different elastic behavior under tension and compression are called bi-modulus materials, and this type of materials widely exists in nature, such as rock, concrete, and cohesive soil. However, due to the lack of a constitutive model that is suitable for bi-modulus materials, the bi-modulus property of materials was often ignored in previous studies. In this study, the uncoupled strain-driven constitutive model for bi-modulus materials proposed by Latorre and Montáns¹ is firstly embedded into the finite element software FssiCAS. Then the distribution characteristics of stress, strain, and displacement in Brazilian disc are systematically compared under the two conditions, i.e., considering the bi-modulus property and ignoring them. Besides, the constitutive model is used to verify the reliability of the measurement methods proposed by Ye et al.^2,3 for the tensile elastic modulus. The results show that the bi-modulus property of materials has a significant effect on the magnitude, and the distribution of stress, strain, and displacement in Brazilian disc. The measurement methods proposed by Ye et al.^2,3 own acceptable reliability only under certain conditions.

在拉伸和压缩作用下具有不同弹性行为的材料称为双模量材料，这类材料广泛存在于自然界中，如岩石、混凝土和粘性土。然而，由于缺乏适用于双模量材料的本构模型，以往的研究往往忽略了材料的双模量特性。^{在这项研究中，Latorre 和 Montáns 1}提出的双模量材料的非耦合应变驱动本构模型首先嵌入到有限元软件 FssiCAS 中。然后系统地比较了考虑双模量特性和忽略双模量特性两种情况下巴西圆盘的应力、应变和位移的分布特征。此外，本构模型用于验证叶等人提出的测量方法的可靠性。^2，3为拉伸弹性模量。结果表明，材料的双模量特性对巴西圆盘中应力、应变和位移的大小和分布有显着影响。Ye 等人提出的测量方法。^2,3仅在特定条件下具有可接受的可靠性。