目的 研究蔗渣-淀粉发泡缓冲材料的缓冲性能，建立此类缓冲材料的本构方程，方便此类材料的应用。方法 对不同密度的蔗渣-淀粉复合材料，在不同湿度和应变率条件下对其进行静态压缩试验，并在Sherwood-Frost本构模型的基础上加以扩展，加入湿度对应变的影响项，建立该复合材料的静态压缩本构方程。根据实验数据，采用Origin拟合的数学方法确定相关系数。以该静态压缩本构方程拟合出的应力-应变曲线作为材料特性载入Abaqus软件中，模拟淀粉-蔗渣纤维发泡缓冲材料并进行静态压缩试验仿真，得到仿真曲线，并与实际试验曲线进行对比。结果 仿真实验与实际实验的数据误差较小，整体误差在10%以内。结论 建立的静态压缩本构方程可以很好地表征该复合材料的缓冲性能，避免了设计缓冲衬垫时需要大量试验才能得到材料曲线的问题。

The work aims to study the buffer performance of bagasse-starch foaming buffer material and establish the constitutive equation of such buffer material, so as to facilitate its application. The static compression test of bagasse-starch composites of different densities was carried out under different humidity and strain rates. Based on Sherwood-Frost constitutive equation, the factors of humidity which influenced the strain were added and the equation was extended. In such case, the static compression constitutive equation of such composite was established. According to the experimental data, the correlation coefficients were identified in the mathematical method fitted by Origin. The stress-strain curves fitted by the static compression constitutive equation could be used as material characteristics and loaded into Abaqus software, to simulate starch-bagasse fiber foaming buffer material and static compression test. The simulation curves were obtained and compared with actual test curves. The difference between simulation experiment and actual experiment was very small, and the global error was within 10%. The static compression constitutive equation established can properly represent the buffer performance of the above-mentioned composite, which avoids the problem that the material curves can only be obtained by conducting a lot of experiments in the process of designing cushion pad.