球形生物材料干燥时的弹性应力研究

建立了弹性应变状态下,生物材料干燥的应力应变模型。应用此模型,可以在得到物料各单元层含水率变化的基础上,得到各单元层的应力与应变。以球型土豆为例,得到:在恒速干燥期,各单元层径向应力与剪切应力逐渐增大,并且剪切应力在1 h～2 h之间达到最大值,径向应力在1 h～3 h之间达到最大值。剪切应力最大值出现在表层,径向应力最大值则出现在含水率高的核心部位。各单元层的应力在达到最大值后缓慢减小,最终接近于零。

Study on the elastic stress of spherical biological materials during Drying

In the state of elastic strain,the stress and strain model for the biological material was modified during drying.From the model,the stress and strain could be calculated on the basis of the change of moisture content.Taking the spherical potato for example,in the constant drying rate period,every element layer of radial stress and tangential strain were gradually increased to maximum.The tangential stress reached the maximum between 1 h~2 h,the radial stress reached the maximum between 1 h~3 h.The maximum ...