用DREF-Ⅲ摩擦纺多组分纬纱织造的织物风格特征

织物风格特征是由织物组织结构和纱的特性决定的，新型纱线结构的不断出现和发展对织物性能和质量提出了更高的要求。研究表明：通过改变纺纱工艺可以获得不同的纱线结构，从而改变织物的风格特征。DREF-Ⅲ型摩擦纺包芯纱具有典型的皮芯结构，可以是双组分也可以是多组分，而且组分的不同会对织物性能产生不同的影响，纱的性能也会由于芯皮之间压力、摩擦力大小的不同而改变。以前的研究主要集中在包芯纱的拉伸性能上，而对空心纱几乎没有什么新的研究和讨论。     

摩擦角的概念及其在工程中的应用

联系工程实际,介绍理论力学及机械中摩擦角的概念及自锁现象,并阐述其在工程实例中的应用.     

摩擦学研究的发展趋势(摘要)

摩擦学作为一门技术基础学科往往与其他学科相互交叉渗透从而形成新的研究领域,这是摩擦学发展的显著特点.主要的交叉学科如下:     

对几种铝合金焊接工艺的研究

铝合金不但具有高的比强度、比模量、断裂韧度、疲劳强度和耐腐蚀稳定性，同时还具有良好的成形工艺性和良好的焊接性，因此成为应用最广泛的一类有色金属结构材料。主要介绍了铝合金焊接的几种先进工艺：搅拌摩擦焊、激光焊、激光-电弧复合焊、电子束焊。针对于焊接性不好和曾认为不可焊接的合金提出了有效的解决方法，几种工艺均具有优越性，并可对厚板铝合金进行焊接。     

浅析美国对华实施"两反两保"措施的发展趋势及应对之策

美国是对华实施反倾销力度最大的国家之一,随着中美经贸关系的不断深入,美国对华实施"两反两保"措施的重心也开始从反倾销向其他贸易救济措施过渡.我国应分析其深层原因,采取相应的措施,在中美经贸关系中尽量争取更大的利益.     

减速机噪声分析与控制

通过观察发现减速机工作噪声主要是减速机齿轮箱中齿轮传动过程中产生的,因此,对齿轮传动过程中产生噪声的各种因素分别从设计、制造、安装、维护与保养等方面作了分析,提出了降低和控制噪声的相应措施。     

例谈解热学综合题

例1 一个质量不计的活塞将一定量的理想气体封闭在上端开口的直立筒形气缸内活塞上堆放着铁砂,如图1所示．最初活塞开始离开卡环而上升．继续加热直到气柱高度为H1：1．5H0．此后在维持温度不变的条件下逐渐取走铁砂,直到铁砂全部取走时,气柱高度度变H2=1．8H0,求此时气体的温度．（不计活塞与气缸的摩擦）     

构建等比数列巧解一道高考压轴题

题（2004江苏高考压轴题）一个质量为M的雪橇静止在水平雪地上,一条质量为m的爱斯基摩狗站在该雪橇上．狗向雪橇的正后方跳下。随后又追赶并向前跳上雪橇;其后狗又反复地跳下、追赶并跳上雪橇,狗与雪橇始终沿一条直线运动．若狗跳离雪橇时雪橇的速度为v,则此时狗相对于地面的速度为v＋u（其中u为狗相对于雪橇的速度,v＋u为代数乖。若以雪橇运动的方向为正方向,则可为正值,u为负值）．设狗总以速度v追赶和跳上雪橇。雪橇与雪地间的摩擦忽略不计．已知v的大小为5m/s,u的大小为4m/s,M=30kg,m=10kg．     

Tribology Performance and Adhesive Strength Evaluation of TiAlSiN Coating

Scratch test and friction test were performed to evaluate the internal and external interface behaviors of TiAlSiN coating, respectively. The critical compressive and shearing stress of coating failure during scratch test were calculated and the values are 30.84 MPa and 4.98 MPa respectively. The average friction coefficients of TiAlSiN coating against 2Cr12Ni4Mo3VNbN steel are 0.70 (sliding speed 50 m/min), 0.63 (sliding speed 100 m/min), and 0.81 (sliding speed 150 m/min). The elements diffusion was analyzed by EDS. Al and Si element of coating material diffuse to the steel disc, except Ti element. The oxidation decreases with the increase of sliding speed, but the adhesion increases with the increase of sliding speed. More Al element diffuses to the steel disc at the high sliding speed, but the diffusion of Si element keeps almost constant at different sliding speeds.     

Experimental and FEM Study of Coated and Uncoated Tools Used for Dry Milling of Compacted Graphite Cast Iron

Compacted graphite cast iron (CGI) has been the material for high-power diesel engines recently, but its increased strength causes poor machinability. In this study, coated and uncoated carbide tools were used in dry milling experiment and FEM simulation to study the machinability of CGI and wear behaviour of tools. The experimental and FEM simulation results show that coated tool has great advantage in dry milling of CGI. SEM and EDS analysis of tool wear indicate the wear morphology and wear mechanism. Adhesive wear is the main mechanism to cause un-coated tool wear, while abrasive wear and delamination wear are the main mechanism to cause coated tool wear. Stress and temperature distribution in FEM simulation help to understand the wear mechanism including the reason for coating peeled off.