非光滑结构对轮胎抗滑水性能影响分析

借鉴流体领域中非光滑结构减阻特性,在轮胎纵向花纹沟底部引入V形沟槽结构,探索其对轮胎抗滑水性能的影响。以轮胎单个花纹沟作为分析对象,建立V形沟槽分布数学模型和轮胎滑水模型,运用CFD(计算流体力学)方法对轮胎滑水进行数值分析。借助正交试验法建立L16(45)正交表,分析V形沟槽结构相比光滑结构的壁面减阻率,得到减阻效果最佳的V形沟槽设计参数,接着将优选出的V形沟槽非光滑结构引入到轮胎纵向花纹沟槽底部进行滑水分析。结果表明：V形沟槽非光滑结构能有效降低轮胎花纹沟壁面阻力系数,提高轮胎的抗滑水性能。     

全钢载重子午线轮胎花纹沟底裂口的原因分析及解决措施

根据对全钢载重子午线轮胎纵向花纹的应力分析,采取改善轮胎轮廓设计、优化材料分布、改善花纹沟形状、合理设计花纹沟底圆弧等方法,可改善轮胎接地压力分布和花纹受力,减小胎面胶变形,提高轮胎的耐疲劳性能,进而改善花纹沟底裂口现象。     

载重斜交轮胎曲折花纹沟裂口原因分析及解决措施

介绍载重斜交轮胎曲折花纹沟裂口的产生原因及相应解决措施.通过改进花纹设计,即适当增大中沟宽度和优化沟底结构;严格控制硫化工艺,硫化后及时充气,且充气压力较高;优化胎面胶配方(改善胎面胶耐屈挠龟裂性能和抗裂口增长性能与生热性能的平衡)和加强原材料质量检验等措施,有效解决了载重斜交轮胎曲折花纹沟裂口问题,提高了轮胎的使用安全性.     

非光滑结构对轮胎抗水滑性能的影响

以轮胎单个花纹沟作为分析对象,建立V形沟槽分布数学模型和轮胎水滑模型,运用计算流体力学方法对轮胎水滑性能进行分析。用正交试验法分析和对比V形沟槽结构与光滑结构的壁面减阻率,得到减阻效果最佳的V形沟槽设计参数,并引入轮胎纵向花纹沟槽底部进行水滑分析。结果表明,V形沟槽非光滑结构能有效降低轮胎花纹沟壁面阻力系数,提高轮胎的抗水滑性能。     

纵向花纹载重斜交轮胎受力分析及花纹沟底裂口改善措施

根据对载重斜交轮胎纵向花纹块的受力分析,采取改善轮胎轮廓设计、优化接地印痕形状和接地压力分布、改善花纹沟形状、减小花纹块曲折度、减小花纹深度和花纹块所占比率及合理设计花纹沟下部圆弧等措施,可以降低花纹沟底的应力集中和橡胶的应变幅度,提高胶料的耐疲劳寿命,进而改善花纹沟底裂口现象。     

7.00R16LT 14PR公路型全钢轻型载重子午线轮胎的开发

介绍7.00R16LT 14PR公路型全钢轻型载重子午线轮胎的开发。结构设计:外直径768 mm,断面宽198 mm,行驶面宽度148 mm,行驶面弧度高4.8 mm,胎圈着合直径404.1 mm,胎圈着合宽度152 mm,断面水平轴位置(H₁/H₂)0.9907;采用有限元分析方法,通过调整轮胎外轮廓曲线解决冠部花纹异常磨损问题;花纹沟壁采用单边双层设计,花纹沟底采用偏心设计,可有效改善花纹沟夹石子问题。施工设计:胎体采用3×0.22/9×0.20CCHT钢丝帘线,带束层采用2层2+7×0.30ST超高强度钢丝帘线,以提升轮胎的高速性能和承载性能;胎面配方优化设计后可提高轮胎的耐磨及抗刺扎性能。成品轮胎性能试验结果表明,成品轮胎充气外缘尺寸及强度、耐久和高速性能均符合设计要求。     

港口机械用轮胎

由青岛泰凯英轮胎有限公司申请的专利(公开号CN 202573663U,公开日期2012-12-05)"港口机械用轮胎",涉及的港口机械用轮胎胎面由交互排列的花纹块和花纹沟组成,花纹沟截面为全圆弧形,使花纹块与花纹沟的过渡更加平缓,减少了花纹块与花纹沟过渡部位出现应力集中的可能性,并可有效抵抗港口机械在频繁扭转作业方式下不规则力对花纹沟底的冲击。     

[发明公布] 一种轮胎胎面结构申请公布号：CN105751826A

本发明提供了一种轮胎胎面结构,其包括轮胎胎面,形成在轮胎胎面上的第一花纹沟,以及设置于第一花纹沟内的加强筋。特别地,轮胎胎面上还形成有第二花纹沟,第二花纹沟的底面与轮胎胎面间的距离大于加强筋的顶面与轮胎胎面间的距离,第二花纹沟的宽度最宽的位置位于加强筋的顶面内侧,或与加强筋的顶面处于同一平面内。本发明提供的轮胎胎面结构中因为轮胎胎面上形成有特殊的第二花纹沟,可在轮胎胎面磨损到一定程度后(如磨损到加强筋顶面),宽度变宽,使轮胎胎面上再次具有花纹沟,即再生花纹沟,可保证轮胎使用中后期的牵引力、制动性能等,也可延长轮胎的使用寿命和行驶里程。     

轮胎用纤维骨架材料性能测试方法

介绍轮胎用纤维骨架材料性能的标准和非标准测试方法.重点从动态力学性能、耐疲劳性能和抗冲击性能3个方面对非标准方法进行介绍.纤维帘线耐疲劳性能的6种试验方法依次是Mallory胶管、U.S胶管、固特里奇盘形疲劳、费尔斯通压缩-屈挠疲劳、登录普疲劳和德里西亚屈挠疲劳试验方法.     

一种轮胎钢丝帘布层的耐疲劳性测试方法及其应用

正申请公布号:CN 112014250A申请公布日:2020年12月1日申请人:安徽佳通乘用子午线轮胎有限公司发明人:吴咸鹤、刘治江本发明介绍了一种轮胎钢丝帘布层的耐疲劳性能测试方法及其应用。该测试方法包括以下步骤:步骤1,在钢丝帘布层上下表面各形成耐磨胶层,制备得帘布层试样;步骤2,试样非两端的位置设在轮胎帘线疲劳试验机的导辊上,使试样有一定弯曲曲率,试样的两端使用夹具固定,使两端处于自然伸直状态;步骤3,设置弯曲曲率、试样运动频率和导辊施加给试样的力值方向向上的负荷,进行耐疲劳性能测试。     

乙苯,苯乙烯的生产及合成乙苯,苯乙烯催化剂的研究进展

苯乙烯是重要的石油化工原料。本文介绍了国内外苯乙烯生产的发展概况，合成乙苯，苯乙烯所用的催化剂种类，并就苯乙烯生产及催化剂的发展趋势提出了自己的观点。     

Synthesis and characterization of homopolymers and copolymers of various acrylates and acrylonitrile

Various homopolymers and copolymers of methyl acrylate, ethyl acrylate, butyl acrylate, and acrylonitrile in different feed ratios were synthesized. These were characterized by IR, ¹³C-NMR, DSC, DTA, and TGA. Spectroscopic characterization helped in differentiating copolymers of different mol ratios. Thermal analysis revealed different degradation patterns for homopolymers and copolymers. The temperature and energy changes associated with various phase transitions were dependent on the chemical composition of homo- and copolymers, as expected. © 1993 John Wiley & Sons, Inc.     

生物质气化及生物质与煤共气化技术的研发与应用

总结了生物质原料的特点及生物质单独气化的缺点;介绍了国内外生物质气化技术及生物质与煤共气化技术的研发与应用现状;分析了在此领域国内外的发展趋势与前景;概括了开展生物质与煤共气化技术研发的意义。     

Comparison of the Adhesion and Cohesion of Triblock and Random Copolymers of Styrene and Butadiene

A substantially greater detachment energy is required to strip a polyethylene tereph-thalate (Mylar) film from a styrene-butadiene-styrene (SBS) triblock copolymer compared to that for peeling from a random styrene-butadiene (SBR) copolymer. This is true even though the intrinsic interaction between the Mylar and each elastomer is expected to be similar because of their virtually identical chemical composition. It is proposed that this difference in peel strength (between the SBS and SBR) is a consequence of the much higher dissipative capacity of the former elastomer. Another manifestation of this is the higher cohesive tear strength of the SBS compared to the SBR. Extents of energy dissipation within each elastomer during detachment of the Mylar adherend are consistent with the hypothesis that the average maximum stress experience before detachment is some similar fraction of each elastomer's tensile strength.     

责任和责任心的涵义与结构

责任是人应主动承担的角色义务和对其因过失所造成后果应承担的责罚.有两层涵义:一是义务;二是后果.责任心是个体自觉做好分内事务和履行道德义务的心理倾向,是个性心理品质成分中自我特征维度上的重要内容.责任心具有两个方面的涵义:一是角色分内职责;二是角色道德义务.责任心是一种通过责任认知、责任个性和责任适应的动态形式表现出来的静态品质,责任心是责任心过程结构与责任心关系结构相互制约、相互影响的统一体.     

二甲基二烯丙基氯化铵和丙烯酰胺的合成及应用

用复合引发体系(过硫酸盐-偶氮类引发剂)和脂肪胺类氧化还原体系引发,在实验室获得了单体转化率≥98%,特性粘数高于13.6 dL/g的阳离子共聚物PDA,探讨了控制聚合物分子量的影响因素.     

钾盐资源及钾肥供需情况分析及预测

阐述了国内外钾盐资源及钾肥生产现状,对国内外钾盐的供需形势进行了分析及预测,从资源、原材料、国际市场三方面提出了解决我国钾盐短缺的措施。     

Electronic structures and reactivities of monometallic and bimetallic clusters of Au and Cu

The variation of the Au 4f binding energy of Au clusters with the cluster size has been established by measuring the binding energies of clusters whose size distributions were independently determined by HREM and STM. The binding energy increases significantly when the cluster size is less than 2 nm. Au-Cu bimetallic clusters of the composition Cu₃Au have been deposited for the first time on carbon substrates. The shifts in the core level binding energies of the bimetallic clusters show the effect of alloying in the case of large clusters, but show effects of both alloying and cluster size in the case of the small clusters. The interaction of CO with Cu₃Au clusters is stronger than with a bulk Cu metal. The interaction of CO with small Cu clusters also seems to be stronger than with bulk Cu or with large Cu clusters.     

Wetting properties of homopolymers and copolymers of pentafluorostyrene and methylacrylate and homopolymer blends

Polypentafluorostyrene (PPFS), polymethylacrylate (PMA), and poly(pentafluorostyrene-co-methylacrylate), poly(PFS-co-MA) were prepared and the wetting characteristics of polymer blends of PPFS and PMA were compared with that of poly(PFS-co-MA) via contact angle measurements. The critical surface tension of polypentafluorostyrene was found to be 22.6 dyne/cm, which is comparable to the value reported for polytrifluoroethylene (22 dyne/cm). The critical surface tension of poly(PFS-co-MA) is not linearly related to its composition. The polymer blends of PPFS and PMA exhibit significant surface enrichment of the fluoropolymer. The harmonic-mean method¹ was employed to determine surface tensions of these polymers and many known polymers. It is found that the method produces useful surface tension data provided the contact angle values are derived from testing liquids of dissimilar polarity.