过渡支撑条件下扇环形板应力分析

分别建立了仅有直边支撑和圆弧边支撑的扇环形板模型。运用ANSYS软件对扇形角为45°和60°时,不同支承竖板厚度的模型进行数值模拟。模拟结果表明,随着支撑竖板厚度的增加,扇环形板应力逐渐降低。相对圆弧边支撑,扇环形板角度对直边支撑的模型应力影响较大。当支撑竖板厚度超过某一数值时,扇环形板应力几乎不再随支撑竖板厚度的增大而减小,可认为进入固支状态。另一方面,当支撑竖板厚度小于某特定数值时,扇环形板应力达到最大值,进入简支状态。分析结果认为,随着支撑竖板厚度的增大,扇环形板依次处于简支、简支与固支之间的过渡支撑和固支状态。通过研究不同支撑竖板厚度时扇环形板的应力,可以为过渡支撑条件下扇环形板的设计提供合理的模型,所得应力分布情况可为不同扇形角条件下扇环形板的应力分析提供参考。

Freestanding oxide membranes:synthesis,tunable physical properties,and functional devices

The study of oxide heteroepitaxy has been hindered by the issues of misfit strain and substrate clamping,which impede both the optimization of performance and the acquisition of a fundamental understanding of oxide systems.Recently,however,the development of freestanding oxide membranes has provided a plausible solution to these substrate limitations.Single-crystalline functional oxide films can be released from their substrates without incurring significant damage and can subsequently be transferred to any substrate of choice.This paper discusses recent advancements in the fabrication,adjustable physical properties,and various applications of freestanding oxide perovskite films.First,we present the primary strategies employed for the synthesis and transfer of these freestanding perovskite thin films.Second,we explore the main functionalities observed in freestanding perovskite oxide thin films,with special attention to the tunable functionalities and physical properties of these freestanding perovskite membranes under varying strain states.Next,we encapsulate three representative devices based on freestanding oxide films.Overall,this review highlights the potential of freestanding oxide films for the study of novel functionalities and flexible electronics.

某框架低强度混凝土的结构加固设计和施工技术

介绍采用灌浆料置换框架梁柱部分截面的低强度混凝土及碳纤维布加固梁柱节点的方法。置换法的运用,得力于将已建框架结构采取措施临时转换为砖混结构及框架柱中钢筋骨架焊接成格构柱,共同传递荷载的综合施工方案和技术措施。