However, the correlation effect over time in SUR model is not taken into account. In a standard linear model, we often assume the error terms are identically independent distributed.
研究表明，与没有考虑不同时间上的相关性的信度回归模型相比较，考虑了相关性的模型得到的估计值的误差较小。
It is better to use the standard linear model (SLM) simulating the earth medium crust. In a short period of time it shows elasticity, and it shows rheological properties in a long time.
标准线性体模型用来表示地球介质的粘弹性较好，它在短时间内，表现出明显的弹性性质，而在较长时间内，表现出明显的流变特性。
Thus, a nonlinear viscoelastic constitutive relation for cement mortar based on standard linear solid model considering the evolution of the damage internal variable is established accordingly.
据此，在标准线性固体模型的基础上，考虑损伤内变量的演化，建立了应变率相关的水泥砂浆的非线性黏弹性损伤模型。
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