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首页> 外文会议>IUYAM Symposium on Theoretical and Numerical Methods in Continuum Mechanics of Porous Materials, Sep 5-10, 1999, Stuttgart, Germany >Drying Induced Stresses in Viscoelastic Sphere
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Drying Induced Stresses in Viscoelastic Sphere

机译：粘弹性球体中的干燥诱导应力

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The main subject of this paper is to study how the constitutive model of saturated porous body influences the numerically estimated drying induced stresses and deformations. Mechanical properties of porous materials are changing during drying. At the beginning they are viscous and in the course of moisture removing become viscoelastic, elastic or even brittle.To authenticate the calculations, the material of the sphere is asumed to be both elastic and viscoelastic. One states a significant difference between the results obtained for the elastic sphere and viscoelastic one, particularly for stresses. The thermodynamical background of the model used in this paper is presented in Kowalski ([4]) and Kowalski and Strumillo ([3]). The solution of the problem was obtained making use of both the Laplace transformations and the finite difference method. The considerations are confined to the constant drying rate period in which the temperature of the saturated body is constant in the whole cross-section and equal to the wet-bulb temperature. Phase transitions inside the dried material are ignored and the whole evaporation of the moisture is assumed to proceed on the boundary of the drying material.
机译：本文的主要主题是研究饱和多孔体的本构模型如何影响数值估计的干燥引起的应力和变形。多孔材料的机械性能在干燥过程中会发生变化。刚开始时它们是粘性的，在除湿过程中会变成粘弹性，弹性甚至脆性。为验证计算结果，假设球体的材料既是弹性的又是粘弹性的。一个陈述了在弹性球体和粘弹性的结果之间的显着差异，特别是对于应力。本文使用的模型的热力学背景在Kowalski（[4]）和Kowalski和Strumillo（[3]）中有所介绍。通过同时使用拉普拉斯变换和有限差分法获得了问题的解决方案。这些考虑仅限于恒定的干燥速率周期，其中饱和体的温度在整个横截面上都是恒定的，并且等于湿球温度。干燥材料内部的相变被忽略，并且假定水分的全部蒸发在干燥材料的边界上进行。

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