搜索 - 科创中国

Structural Performance of Light Weight Multicellular FRP Composite Bridge Deck Using Finite Element Analysis

Fiber reinforced polymer (FRP) composite materials having advantages such as higher strength to weight than conventional engineering materials, non-corrosiveness and modularization, which should help engineers to obtain more efficient and cost effective structural materials and systems. Currently, FRP composites are becoming more popular in civil engineering applications. The objectives of this research are to study performance and behavior of light weight multi-cellular FRP composite bridge decks (both module and system levels) under various loading conditions through finite element modeling, and to validate analytical response of FRP composite bridge decks with data from laboratory evaluations. The relative deflection, equivalent flexural rigidity, failure load (mode) and load distribution factors (LDF) based on FE results have been compared with experimental data and discussed in detail. The finite element results showing good correlations with experimental data are presented in this work.

Woraphot Prachasaree,Pongsak Sookmanee - 武汉理工大学学报(材料科学版)(英文版)

文章来源：万方数据

混杂纤维增强木梁的受弯性能试验研究

选用碳纤维(CF)、玻璃纤维(GF)和高强玻璃纤维(SGF)为增强材料,制作CF,CF/GF和CF/SGF层间组合混杂纤维增强木梁,并对其受弯性能进行了试验研究,同时分析了该木梁的破坏形态和破坏机理,讨论了其荷载-位移特征、极限承载力和延性.结果表明:与单一CF增强相比,合理匹配混杂纤维增强复合材料(HFRP)可显著提高木梁的承载力和延性.提出了HFRP增强木梁的极限承载力计算方法.

杨友龙,熊光晶 - 建筑材料学报

文章来源：万方数据

Meso-mechanical Interfacial Behavior of Elbow Steel Fiber Reinforced Concrete

The strain distributions near the interface when the elbow steel fiber is pulled out from the half-mould concrete matrix are directly measured using a combined method of single fiber pull-out test and digital image correlation. Meanwhile, the real-time processes of the bonding, debonding and sliding at the interface are observed. The micro-mechanism of the strain localization in the failure process of interface when debonding occurs and the strengthening mechanism at the imbedded fiber are discussed. The experimental results show that the meso-scale strain localization gives rise to the localization of shear damage near the fiber interface. This strain localization characterized by the debonding process near the interface occurs, develops and moves gradually at an apparently regular interval. At the elbow part of the imbedded fiber, the peak value of the shearing stress occurs. But the primary debonding does not occur at this place because the strength of the shear damage is increased at the local area of the elbow part in the concrete, displaying an apparent reinforced effect at the end of the fiber.

赵燕茹,邢永明 - 武汉理工大学学报(材料科学版)(英文版)

文章来源：万方数据

Ф10mm碳纤维复合材料管成型工艺及性能研究

对外径为Ф10mm碳纤维复合材料管成型工艺及性能进行了研究.结果表明,采用热缩工艺成型的碳纤维复合材料管工艺简单、质量可靠,Ф10mm碳纤维复合材料管件弯曲刚度与不锈钢管相当,弯曲强度为不锈钢的3倍以上,质量仅为不锈钢的50%,尺寸精度满足设计要求.

赵锐霞,尹亮,潘玲英,董波 - 宇航材料工艺

文章来源：万方数据

腐蚀环境下FRP加固结构的疲劳性能综述

在现代工程项目中,反复荷载作用下钢筋混凝土结构的疲劳问题正越来越受到人们的重视.当结构或者构件处于腐蚀环境中时,其疲劳性能的降低要比静态时要明显.目前用FRP在结构加固中的应用越来越普遍,本文针对腐蚀环境下 FRP 加固钢筋混凝土结构疲劳性能的已经研究和尚待深入研究的问题进行了分析与探讨.

周雪华,许晓 - 低温建筑技术

文章来源：万方数据

同向双螺杆挤出机在聚合物脱挥中的应用研究

综述了聚合物脱挥设备的分类和基本情况,并着重介绍了双螺杆挤出机在聚合物脱挥领域中的应用、优点、国内外发展概况及发展趋势等,同时在大量工业化应用的基础上提出了切实可行的同向双螺杆挤出机脱挥工艺,并详细分析了同向双螺杆挤出机主要零部件的设计要求和设计方法.

贾朝阳,张小莹,梁晓刚 - 中国塑料

文章来源：万方数据

应力作用下纤维混凝土抗渗特征研究

通过试验研究了聚丙烯(PP)纤维和植物纤维素(UFPP)纤维对受荷混凝土渗透性能的影响.结果表明:在一定荷载范围内,纤维混凝土的抗渗能力有所提高,当荷载超过混凝土破坏荷载30%左右时,其抗渗能力随之下降.同时研究了纤维对各龄期混凝土抗氯离子渗透性能及抗冻融循环耐久性能的影响,并分析了其机理.

孙家瑛 - 建筑材料学报

文章来源：万方数据

无定型聚合物熔体的PVT特性

采用带有PVT口模的流变仪测定无定型聚合物熔体在压力0~50 MPa,温度453~563 K时的PVT(压力-体积-温度)特性曲线,分别用基团贡献修正胞腔模型(GCMCM)和胞腔模型对实测的PVT数据进行预测.结果表明:在实验中用基团贡献修正胞腔模型的比容平均预测误差较胞腔模型要大得多,其预测精度要略差于胞腔模型,这说明基团贡献修正胞腔模型的应用具有一定的局限性.同时还计算出了2种模型所对应的特征值,并分析了其特征值存在的共同点和差异的原因.

王敏杰,陈灿波,刘莹 - 塑料

文章来源：万方数据

共烧结法制备梯度致密化Al2O3中空纤维膜

用实验室自制的Al2O3中空纤维膜为基膜,以Al2O3粉末分散液和Al粉分散液为原料,用真空抽滤法与浸渍法制备过渡层,再浸涂勃母石溶胶,烧结形成梯度致密化Al2O3中空纤维膜.讨论了梯度致密化Al2O3中空纤维膜的形貌、泡点压力、膜孔径与渗透性能等因素.结果表明,造成膜性能差异的主要原因有:(1)Al2O3粉末与Al粉的熔点差异;(2)真空抽滤形成的滤饼与浸涂形成的吸附层之间的厚度差.同时,所制得的梯度致密化Al2O3中空纤维膜纯水通量为17~2 990 L/(m2·h·0.1 MPa),平均孔径为0.04~0.52 μm.

韩灵凤,曹悦,许振良 - 膜科学与技术

文章来源：万方数据