玻纤增强基材的创新与发展

分析了当今下游复合材料工业的发展对玻纤增强基材发展的需要。重点介绍了风电叶片用玻纤纱、技术织物、复合织物、预浸渍制品、预成型增强体等各类玻纤增强基材以及增强热塑性塑料用的短切纤维、混合纱、LFT、GMT、GMT-D、LFT—D、增强热塑性片材等各类玻纤增强基材。并为玻纤增强基材如何促进这两类复合材料产品的发展提出建议。     

浅谈被忽视的房屋建筑结构施工质量问题

提出了房屋建筑中一个广泛被忽视的质量问题,即框架剪力墙结构中边板负弯矩钢筋锚固长度不足及墙体分布钢筋应作为连梁的腰筋在连梁范围内拉通连续配置问题,通过成因分析,提出了合理建议,以保证工程质量。     

Laser cladding composite coatings by Ni–Cr–Ti–B4C with different process parameters

To investigate the effect of laser process parameters on microstructure and properties of composite coating, the composite coatings were manufactured by laser cladding Ni–Cr–Ti–B₄C mixed powder on Q235 mild steel with different process parameters. The coatings are bonded with the substrate by remarkable metallurgical binding without cracks and pores. The composite coatings are consisted of in situ synthesized solid solution Ni–Cr–Fe, intermetallic compound (IMC) Ni₃Ti, Cr₂Ti, and ceramic reinforcements TiB₂, TiC. Results of scanning electron microscopy (SEM) revealed that the ceramic reinforcements became coarser with higher specific energy (E_s). There were independent ceramics TiB₂, TiC, eutectic ceramic TiB₂–TiC in coatings, and eutectic alloy–ceramic was detected. Compared with the substrate, the microhardness of coatings was increased significantly, and the maximum microhardness of coatings was approximately five times as high as the substrate. The wear resistance of coatings was improved dramatically than the substrate. Compared to the coatings with lower E_s, higher E_s led to lower microhardness and worse wear resistance ascribing to more Fe diffused into the coating from the substrate.     

弥散强化铜基复合材料的研究现状与展望

弥散强化铜（DSC）合金因为有一系列优良的性能而逐渐成为很多领域中不可替代的结构功能材料，常用的增强相一般有Al2O3,WC和TiB2，最近，又有一种新的Ti3SiC2陶瓷被用来作为增强相。本文对几种复合材料分别做了介绍．分析了研制弥散强化铜基复合材料中的一些问题，还对该材料的应用进行了展望。     

Temperature dependence of the thermal conductivity and thermal diffusivity of treated oil‐palm‐fiber‐reinforced phenolformaldehyde composites

The effective thermal conductivity (λ_e) and effective thermal diffusivity (χ_e) of oil‐palm‐fiber‐reinforced treated composites were measured simultaneously with the transient plane source technique from 50 to 110°C. The fibers of the composites were treated with sodium hydroxide alkali, silanol, and acetic acid. The experimental results for the different treated composites showed that there were variations in λ_e and χ_e over this temperature range. However, the maximum values of λ_e and χ_e were observed at 90°C, in the vicinity of the glass‐transition temperatures of these composites. An effort was also made to predict the temperature dependence of λ_e and χ_e through the development of an empirical model. The theoretically predicted values of λ_e and χ_e for these composites were in excellent agreement with the experimental results over the entire range of investigated temperatures. Sudden increases in λ_e and χ_e in the glass‐transition region of these composites were indicative of the fact that the crosslinking density decreased and was at a minimum at the temperature at which λ_e and χ_e showed their maxima. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 3458–3463, 2003     

小湾拱坝跨横缝抗震钢筋的影响因素分析

利用考虑钢筋滑移的拱坝横缝配筋动力非线性模型，对设计地震荷载工况下的小湾拱坝进行了三维动力非线性有限元分析，研究了跨缝钢筋与周围混凝土的粘结质量、钢筋直径等因素对跨缝钢筋控制横缝变形的影响，为横缝变形控制措施的工程应用提供了有意义的参考。     

FRP网格加固桥梁水下结构技术研究与应用

桥梁水下结构在我国桥梁结构的工程实践中普遍存在,桥梁水下结构常常需要面临加固需要,传统的水下结构加固技术具有造价高、工期长的缺点。以某桥梁的水下桩基础加固工程为背景,对比分析了3种不同的水下结构加固方案,通过工程实践应用,论证了纤维网格(FRP网格)加固桥梁水下结构技术的可行性,提出了FRP网格加固桥梁水下结构的施工工艺,其以水下无排水施工为指导思想,将高强轻质的FRP网格作为增强材料,以水下不分散材料为黏结材料,实现对桥梁水下结构的快速加固修复。FRP网格加固桥梁水下结构技术是一种新的有效技术,尤其在无法或难于修筑围堰的情况下,具有广阔的应用前景。     

深基坑开挖坑底隆起影响因素有限元分析

深基坑工程中由于土体开挖卸荷,导致基坑坑底隆起,其隆起量的大小直接关系到基坑安全和稳定,已越来越受到重视。系统地研究基坑坑底隆起的影响因素并对其进行有限元分析尚不多见。利用有限元软件ABAQUS建立有限元模型,研究坑底工程桩、坑底被动区加固、地下连续墙插入深度和坑底软土层厚度等对坑底隆起变形的影响,并探讨各隆起变形控制措施的控制效果。最后通过南京某隧道基坑的实测数据,验证了坑底设置工程桩对坑底隆起的控制效果。     

Effect of reinforcements at different scales on mechanical properties of epoxy adhesives and adhesive joints: a review

Improvement of the mechanical properties of adhesives and adhesive joints has been a subject of great interest in recent years. Up to now, several methods have been presented such as modifying substrate shapes, adding microparticles (MPs) and nanoparticles (NPs), and embedding micro and macrofibers in the adhesive layer. This review aims to investigate how these reinforcements of different scales in the adhesive layer influence the mechanical properties of adhesive joints and adhesives. Characteristics and applications of reinforcements are introduced in the first part. In the second part, the effects of several parameters commonly investigated by researchers on the strength, stiffness and fracture toughness improvement of polymeric materials are reviewed for reinforcements of different scales. Finally, damage mechanisms involved in increasing or decreasing the mechanical properties are reviewed and discussed.