Two-stage fatigue loading of woven carbon fibre reinforced laminates

A brief review of the models used to predict the cumulative fatigue damage in FRP composites is presented. Two‐stage fatigue loading of a [0/90,± 45₂,0/90]_s quasi‐ isotropic woven carbon fibre/epoxy resin laminate was evaluated at stress ratio R = 0.05 and the failure mechanisms investigated using x‐radiography after each loading stage. The results are presented in terms of fatigue strength and damage growth and are compared with those in the literature. A low‐to‐high loading sequence is more damaging than a high‐to‐low one and the Palmgren‐Miner linear damage rule may no longer be valid for this kind of material, as previously reported.     

织物-树脂复合材料层压板的准静态侵彻机理

本文利用MTS得到了芳纶和高强维纶织物复合材料层压板受尖头侵彻体穿孔的准静态侵彻曲线 ,比较和分析了不同类型纤维集合体与热固性树脂和热塑性树脂复合材料的破坏模式 ,并考察了芳纶织物复合材料层压板侵彻的逐步破坏过程 ,揭示了复合材料层压板的准静态侵彻机理。     

蓄热室效能剖析

提高蓄热室效能是降低池窑能耗的有力措施.本文分析了反映蓄热室热交换能力的综合传热系数,进一步探讨了格子砖内部热交换过程和外部热交换过程中的矛盾以及解决矛盾的方法,继而谈及妥善处理在增加格子砖热交换表面上的矛盾,最后提出了衡量蓄热室效能的技术-经济指标以及提高技术指标的主要途径.     

氟挥发对氟化物乳白玻璃瓶罐生产的影响

氟挥发对氟化物乳白玻璃瓶罐生产的影响陆德明，周俊梅，付希英（山东轻工业学院２５０１００）（山东德州玻璃厂２５３０１９）ＴｈｅＩｎｆｌｕｅｎｃｅｏｆＦｌｕｏｒｉｎｅＶｏｌａｔｉｌｉｚａｔｉｏｎｏｎＰｒｏｄｕｃｔｉｏｎｏｆＦｌｕｏｒｉｄｅｏｐａｌＧｌａｓ...     

提花织物意匠和纹板CAM系统

CAM系统的研制是从国情出发,保持传统产品特点和工艺要求,能适应多品种多规格的需要,有使用方便和通用性强的优点,并且在小样彩色图案的输入和识别处理、意匠过程中顺势间丝、影光、泥地处理等难题上有突破性发展,达到了实用要求。     

真丝纬编织物的品种开发

真丝针织物的品种花色单调已严重影响和制约其扩大出口创汇及生产企业的经济效益及发展。认为主要是品种开发与市场需求脱节,未能掌握国际市场导向指导消费,以及生产技术素质和管理能力不足。文章提出了开发真丝纬编织物的基本原则和目前可行的开发品种。     

Characterization of Tomato Pulp Stickiness during Spray Drying using a Contact Probe Method

A contact probe test was developed to characterize the surface stickiness of a tomato pulp droplet at various moisture contents and temperatures. To provide tomato pulp samples with different moisture contents, tomato powder produced by a laboratory spray dryer was wetted to seven different moisture levels. The instantaneous tensile force curve was recorded during the probe withdrawal from which the maximum tensile force and other useful information were obtained and cross-examined against images of bonding, debonding, and failure of the material. Generally, at higher moisture contents tomato pulp exhibited cohesive failure followed by semi-adhesive failure, but when moisture content decreased to a certain level, a peak tensile pressure was observed and the failure was adhesive. In addition, higher temperatures shifted the points of adhesive failure toward lower moisture content.     

平纹织物复合材料的弹性模量预测

利用细观力学的代表体积元(RVE)法,预测了平纹织物复合材料的弹性模量。建立了表征RVE形态的数学模型,分析了细观结构与宏观性能之间的关系,编制了从组分材料的弹性性能推测复合材料的弹性性能的预测程序。对理论预测进行了实验验证,理论值与实测值在一定误差范围内能较好吻合,说明此预测方法具有一定的可靠性。     

Electrical Resistance Measurement of Glass Transition and Crystallization Characteristics of Zr—Al—Cu—Ni Metallic Glasses

In this paper,glass transition and thermal stability of the Zr-Al-Cu-Ni metallic glasses were investigated by using electrical resistance measurement(ERM),DSC and X-ray diffraction techniques.The experimental results show that the ERM is capable of detecting the glass transition of the amorphous alloys and can help to distinguish the crystallization products of the Zr-Al-Cu-Ni metallic glasses owing to the difference of the electrical resistivity between the precipitation phases.     

负离子功能针织物在直接蒸发冷却式空调中的应用

在分析负离子净化空气的原理及环境状况与空气中负离子浓度的关系基础上,应用负离子功能粘胶长丝和涤纶短纤混纺纱针织物作为空调滤材,利用空调出风(冷风)使针织物滤材试样飘动,相互拍击摩擦,使空调出风中的氧气分子和水分发生有效电离,从而产生大量空气负离子。实验结果表明,负离子功能粘胶长丝和涤纶短纤混纺纱针织物都有释放空气负离子的功能;而且在同规格纱线的平针组织、双罗纹组织、蜂巢组织和畦编组织针织物中,畦编组织针织物释放的负离子量最大;空气相对湿度对功能材料释放负离子数量有明显影响,当相对湿度在65%~70%时释放的负离子量趋于最大。