玉米秸秆芯结构建模与径向压缩过程模拟

为了深入研究实芯作物秸秆的压缩特性,以农大108玉米秸秆芯为研究对象,基于秸秆各向异性、非均质、非线性特点,先通过径向压缩试验获取其粘弹性参数,然后应用ANSYS软件建立了玉米秸秆芯横截面圆柱有限元结构模型,并进行径向压缩过程和应力松弛过程的数值模拟.研究表明,五参量广义麦克斯韦模型能较好地描述玉米秸秆芯应力松弛特性,模型拟合参数的试验值与有限元模拟值误差均小于10％.试验验证了玉米秸秆芯模拟结果的可行性和计算模型的有效性.

Structure Modeling and Radial Compression Simulation of Corn Stalk Cores

In order to further understand compression characteristics of the crop straws with core, taking Nongda108 corn stalk cores as object, the viscoelastic parameters were obtained through radial compression test for the crop stalks with core was anisotropic, non-homogeneous and non-linear. The finite element model of the corn stalk core was established with ANSYS. Radial compression and relaxation of corn stalk cores were preceded and simulated. The results showed stress relaxation characteristics of corn stalk cores were depicted by five parameters generalized Maxwell model, and errors between experimental values and finite element simulation values about fitting model parameters were less than 10%. The test approved that the radial compression change curves between test and simulation were accordant, and verified the validity of the simulation results and the feasibility of the calculation model.