非匀质材料板的微结构优化设计

探讨具有微结构构造的非匀质材料构件在微结构层次上的优化设计,即寻求满足构件宏观性能要求的最佳微结构材料与构造参数。文中采用细观元法确定非匀质材料构件宏观性能与材料微结构参数间定量关系,建立起微结构优化设计数学模型,具体分析了复合材料板件满足强度、刚度要求的最佳微结构参数。有关方法可适用于复合材料、功能梯度材料、智能材料等新材料构件。

非匀质材料弹性模量预测的数值方法

工程材料大多属于非匀质材料,因此在求解弹性模量的过程中首先要解决材料非匀质性的实现问题。快速傅里叶变换法利用多个像素点反应材料内部结构与性质,再与迭代法相结合可以预测了非匀质材料的弹性模量。以非匀质杆件和多孔材料为例,通过数值解与解析解比较,初步验证了该方法的有效性。

非线性粘弹性理论及其应用研究进展

评述了近年来关于非线性粘弹性理论及其应用的研究进展.着重介绍分数指数模型的松弛模量和蠕变柔量、非 线性粘弹性本构关系、求解非线性粘弹性问题的弹性回复对应原理、弹性回复对应原理在断裂力学中的应用、非匀质粘 弹性材料的连续介质微观力学等的研究概况,展望了该研究的应用前景.

自保温砌块墙体传热系数检测的一种新方法

提出了一种基于红外热像技术的新型检测方法,适用于自保温混凝土砌块墙体等非匀质围护结构传热系数的检测。通过7d的实验发现,3次实验检测结果与理论计算值最大误差仅为2.85%,完全满足工程检测需求,并验证了新方法的可行性。

Analytical solution for concentration distribution in an open channel flow with phase exchange kinetics

This study is about an analytical attempt that explores the two-dimensional concentration distribution of a solute in an open channel flow.The solute undergoes reversible sorption at the channel bed.The method of multiple scales is used to find the two-dimensional concentration distribution,which is important for modem day application in industry,environmental risk assessment,etc.Study deduces an analytic expression of two-dimensional concentration distribution for an open channel flow with sorptive channel bed.Effects of retention parameter,Darnkohler number on the solute dispersion are also discussed in this paper.Results reveal that slow or strong kinetics(small value of Darnkohler number)increases solute dispersion.It is also observed.that for slow phase exchange kinetics between bulk flow and small retentive channel bed,solute concentration distribution will uniform faster than their inert counterpart.