应用ABAQUS的织物热传递有限元分析

为拓展机织物热舒适性设计、评估和优化的思路,提供一种有效预测织物热阻的方法,基于织物的三维模型及传热学理论,对织物系统进行一维热传递的数值模拟,得到织物传热过程中的温度分布特征。利用显微图像及切片技术获取织物几何结构参数,建立平纹织物的几何模型,并与纱线周围静止空气装配,构成织物系统的三维模型,借助有限元分析软件ABAQUS,根据模拟环境设置边界条件与相互作用,计算模型的数值解。最后通过模拟皮肤散热的恒温平板实验,对数值模拟结果进行验证,结果显示:织物外表面温度的模拟值与实验值随时间变化的一致性较好,理论热阻值与实验热阻值相对误差为3.9%,二者吻合度较高。

ABAQUS based finite element analysis of heat transfer through woven fabrics

In order to expand the research approaches of woven fabric design, evaluation and optimization of thermal comfort, an effective method to predict the thermal resistance of fabric was provided. The numerical simulation of heat transfer through fabric in one direction was investigated according to heat transfer theory and fabric 3?D models, and the temperature distribution in dynamic heat transfer process was described. A geometric model of plain weave fabric was established based on geometrical structure parameters using microscopic image and slicing techniques . The fabric system was assembled by fabric model and still air model around the yarn. The boundary conditions and the interaction were set according to simulation condition and the numerical solution was calculated by the finite element analysis software ABAQUS. The constant temperature flat test simulating the skin heat lose was conducted to verify the validity of the heat transfer model, the results show that the outside surface temperature from simulations and experiments had a good consistency over the time, the error range between the theoretical thermal resistance and the experimental one is 3?9%, and the two results coincided very well.