条带式加筋土挡墙的拉筋原型观测试验研究

为了研究条带式加筋挡土墙拉筋的变化规律,对某条带式加筋土挡墙进行拉筋原型观测试验,在拉筋带表面上粘贴塑性电阻应变片来测定剪切带上的拉应力,对所测数据进行了整理分析,结果表明拉筋带上水平方向的拉（压）应变随着土层厚度的增加而不断增大,并且每一层土体中的拉筋应变分布具有相同的规律。说明了原型观测试验能够有效的反映拉筋应变分...     

工装夹具增强装配技术研究应用

为了减少装配操作步骤和提高装配准确度和效率,在现有CAD软件装配功能的基础上提出一种基于装配特征识别的增强装配算法,利用特征识别以及定义的特征之间的装配关系实现增强装配功能,进而能实现装配的自动化。基于该算法实现的增强装配系统具有良好的扩充性,在实际装配应用中提高CAD软件装配功能的效率。     

Uniting Strength and Toughness of Al Matrix Composites with Coordinated Al3Ni and Al3Ti Reinforcements

Hybrid aluminum composites are fabricated in a novel manner to characteristically induce a layer‐wise aligned distribution of micro‐scale Al₃Ni and Al₃Ti intermetallic particles that are formed in situ within a ductile Al matrix. The simple and unique Rolling of Randomly Orientated Layer‐wise Materials (RROLM) manufacturing methodology enables microstructural tailoring of the intermetallic reinforcing particles to prescribe enhanced crack tip deflection caused by the complex interaction of local veins of reinforcement particles, in an effort to overshadow the classical loss of toughness in large‐particle reinforced composites. The complimentary reinforcements and their interface with the Al matrix are revealed to have a gradual transition zone that functions to maintain critical cohesion with the particles and the matrix, empowering the superior load transfer capability of the particles, and reducing microvoid penetration into the matrix. In situ three‐point bending observations combined with a local strain field analysis, demonstrate the distinctive crack deflection mechanisms exhibit by the composite. Deviating from the norm, this specialized particle reinforced composite exhibited both strengthening and toughening mechanisms simultaneously, over control samples. The investigated design strategy and model material will assist materials development toward light‐weight, stronger, and tougher particle reinforced Al matrix composites.     

A review on mechanisms and recent developments of nanomaterials based carbon fiber reinforced composites for enhanced interface performance

Carbon fiber reinforced composites have attracted lots of attention in many fields. However, on account of the poor infiltration of resin to carbon fiber, the weak interface performance between fiber and resin has been restricting the interface properties of composites. In recent progress, the review attaches more importance to the introduction of the third phase monomer, which mainly uses physical and chemical methods to assemble nanomaterials (such as carbon nanotubes, graphene, etc.) on the carbon fiber surface to modify the interface structure of the carbon fiber reinforced composites, and all of them have been demonstrated in this paper. Furthermore, the effects of introducing nanomaterials on the structure of the fiber/resin interface and the relationship between multi-scale interface structure and properties have been investigated. It can be seen that the design idea of researchers mainly uses one or more theories to improve the interface properties of carbon fiber reinforced composites, such as transition layer, chemical bonding, mechanical interlocking, infiltration, diffusion, and adsorption. In brief, this work provides some novel insights for the preparation of carbon fiber reinforced composites with excellent interlaminar shear strength.     

冷轧带肋钢筋预应力叠合板施工工艺

在现场试验的基础上,将冷轧带肋钢筋叠合板楼盖应用于几个实际工程,认为该种叠合板楼盖不仅在结构,抗震性能上有其优点。     

楼房仓扁梁结构设计

论述了粮食楼房仓中钢筋混凝土扁梁的设计及主要技术经济指标。应用钢筋砼扁梁结构可使建筑物在不增加层高的基础上提供更大的空间,以满足建筑的要求,且无特殊施工要求     

一种新型的加固计算机箱设计

介绍了一种新型加固计算机机箱,其独特的双层箱体结构,使它适合在各种复杂恶劣的环境条件下使用。通过设计实践,阐述了该箱体的结构特点和密封、隔振缓冲、电磁兼容等方面的具体解决方法,特别是箱体成型和综合热设计等关键技术。经环境试验和工程实际应用的检验,证明其具有较好的综合防护性能。     

材料在城市公共设施设计中的应用

公共设施作为城市空间的要素之一,已是城市形象构筑中不可缺少的一部分。在提倡可持续发展的现代社会,产品在满足审美性、使用性的同时,材料的应用至关重要。本文分析现代社会,城市公共设施设计中材料的使用情况,并从绿色设计角度展望未来的材料前景。     

排污玻璃钢管道原材料的分析与选择

本文为石化排污管道的设计进行分析与选材，提出采用玻璃钢管道，并对其树脂基体材料和纤维增强材料的选取进行了分析与选择。     

加固用复合材料力学性能的影响因素

在土木工程中，混凝土结构的加固补强要求连续纤维增强树脂基复合材料应具有较高的抗拉强度、弹性模量和一定的断裂延伸率，本文探讨了在一定成型工艺和环氧树脂基体的条件下，影响这些性能的因素．试验表明，纤维品种、纤维表面处理方法、片材厚度对这些性能有显著的影响；纤维束或纤维布与树脂基体复合固化后，由于固化应力的作用，其增强效率将大大下降。对此，在加固设计时应予以重视。