热塑性弹性体SBS异型材挤出模具设计

本文通过对异型材截面形状及原材料挤出成型性能分析，设计了正确的口模形状及合理的流线形流道，设计的模具能够生产出符合尺寸精度要求的型材。     

隔热条异型材挤出模具设计

通过对隔热条异型材截面形状及原材料挤出成型性能的分析,设计了异型材挤出口模形状、流线形流道及挤出模具结构。经实践证明,该模具口模形状及尺寸设计正确,流线形流道设计合理,能生产出满足尺寸精度要求的隔热条异型材。     

管系柔性分析简介(下)

管系柔性分析简介（下）黄守行中国成达化学工程公司成都６１００４１３．３管系柔性与管系形状及管架设置的关系３．３．１管系形状管系柔性与管系形状密切相关。在管系设计时，一般应使管系的几何形状具有一定的弹性，以便充分利用管系的弯曲或扭转变形，使管系的热胀冷...     

ThinkDesign助推长安汽车模具

回弹现象是板料成形过程中常见的缺陷，按照零件的理论形状设计制造出的模具，所生产出的零件会由于回弹现象而不符合设计要求，严重影响了模具设计的正确性和准确性。因此，要想得到符合要求的形状，就必须改变模具面的形状。     

仪表罩拉深工艺及模具设计

文中分析了仪表罩拉深工艺，计算了仪表罩的毛坯形状及尺寸，确定了拉深次数及工序尺寸，设计了拉深模的模具结构。     

向心泵技术在离心分离机中的应用

本文介绍离心分离机中应用的向心泵泵轮的结构特点、流道形状和相应的设计计算方法及注意点等，可供向心泵设计与改进时参考。     

钢包内衬的设计

介绍了钢包内衬设计的新形式。钢包不仅用于盛装钢水，而且是冶炼的重要设备。其内衬用耐火材料有可能污染钢水，因而在受到化学侵蚀及机械作用时，内衬砖应保持一定的稳定性。关于如何确定钢包内衬的形状尚无绝对性规则，应当根据具体的使用条件来选择材质和内衬形状。     

双螺杆挤出机螺杆设计有关问题的探讨

本文对双螺杆挤出机设计中进料口的形状和位置,螺纹截面形状,螺纹截面形状,捏合块外形,捏合区外部条件及排列方式等设计问题作了探讨。     

建筑用塑料架板的设计

主要介绍一种取代建筑用竹木脚手板和模板的塑料架板，根据脚手板和模板的使用性能要求，设计架板塑件的形状及结构，选择塑料材料。     

冰箱内胆真空成型模具设计方法

针对冰箱内胆体积大、壁薄、形状复杂的特点，根据塑料模具设计程序，围绕冰箱内胆真空成型工艺特点，介绍冰箱内胆真空成型模具设计所涉及的内容及设计方法，包括制品结构分析、设计资料的准备、成型体设计、抽芯机构设计、抽气孔设计、加热和冷却系统设计、密封结构设计和切边装置设计等。     

形状记忆功能纤维及纺织品

形状记忆功能纺织品的开发是近年来在纺织材料学中研究较热门的新兴技术。介绍了该材料国内外的研究进展,对形状记忆合金类、形状记忆聚合物类和形状记忆水凝胶类功能纺织品进行了概述;并对各种不同类别的形状记忆功能纺织品的形变机理和适用领域进行了详细阐述,最后展望了形状记忆功能纺织品的未来。     

Photo-mediated copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) “click” reactions for forming polymer networks as shape memory materials

The formation of polymer networks polymerized with the Copper (I) – catalyzed azide – alkyne cycloaddition (CuAAC) click reaction is described along with their accompanying utilization as shape memory polymers. Due to the click nature of the reaction and the synthetic accessibility of azide and alkyne functional-monomers, the polymer architecture was readily controlled through monomer design to manipulate crosslink density, ability for further functionalization, and the glass transition temperature (55–114 °C). Free strain recovery is used to quantify the shape memory properties of a model CuAAC network resulting in excellent shape fixity and recovery of 99%. The step growth nature of this polymerization results in homogenous network formation with narrow glass transitions ranges having half widths of the transition close to 15 °C for these materials resulting in shape recovery sharpness of 3.9%/°C in a model system comparable to similarly crosslinked chain growth polymers. Utilization of the CuAAC reaction to form shape memory materials opens a range of possibilities and behaviors that are not readily achieved in other shape memory materials such as (meth) acrylates, thiol-ene, thiol-Michael, and poly(caprolactone) based shape memory materials.     

聚氨酯/超细滑石粉形状记忆复合体系的性能研究

以聚己内酯/聚氨酯(PUR)共聚材料为基体,采用反应共混法制备了一种超细滑石粉改性PUR形状记忆复合材料,通过差示扫描量热、X射线衍射等手段对其性能进行了表征,并研究了超细滑石粉的用量对PUR形状记忆复合材料的结晶性能、力学性能及形状记忆性能的影响.结果表明,超细滑石粉对复合材料的结晶度没有明显影响,但能提高结晶温度和刚性,且该复合材料在30℃以下具有较稳定的形状保持性,40℃以下时能在20 s内恢复.     

硅烷偶联纳米SiO2改性形状记忆聚氨酯

本文采用经硅烷偶联剂表面处理的纳米SiO2粒子制备了形状记忆聚氨酯／SiO2纳米复合材料。并用SEM、DSC、TGA对其进行分析,考察其形状记忆行为及力学性能。结果表明,形状记忆聚氨酯中加入纳米SiO2后,其热稳定性能提高了,形状回复起始温度(Ti)提高约10℃,形状回复速率提高约3．8倍,而力学性能有所下降。     

晶须在材料中的应用

晶须由于其特殊的形状和优良的物理化学性质,作为一种新型的功能材料,在复合材料、高分子材料、阻燃防火材料等材料中的应用十分广泛。作者主要介绍了晶须在各种材料中的应用。     

Influence of inherent particle characteristics on hopper flow rate

The inherent factors influencing the shear strength of particulate materials are also believed to influence the flow rate through a hopper. These inherent particle characteristics include particle size, particle-size distribution, particle shape, angularity, hardness, and surface roughness. To determine the effect of inherent particle characteristics on flow rate and pluviated void ratio, a wide range of materials were tested. These materials ranged from manufactured sands and glass beads to natural sands. Determination of particle size, particle-size distribution, and hardness was achieved by conducting conventional tests such as sieve analyses and specific gravity tests. Quantification of the shape and angularity parameter is more difficult due to the nonavailability of any standard techniques. To achieve the objective of quantifying shape and angularity, a new technique was developed utilizing the image analyzer. Two shape parameters, namely, Shape Factor and Angularity Factor, were determined for various materials. Shape and Angularity Factors were correlated with flow rate as well as the pluviated void ratio. Overall, the results indicate that as shape and angularity of particles increase, the flow rate decreases, and pluviated void ratio increase. A good correlation between drained shear strength properties and the flow rates measured in the cone was also found to exist. Therefore, index tests such as flow rate through a flow cone (hopper) can be used to estimate the drained monotonic strength of particulate materials.     

Recent advancement in self-healing graphene polymer nanocomposites,shape memory,and coating materials

ABSTRACT

Recently, self-healing polymeric materials has garnered much attention due to their ability to prolong materials shelf-life. Graphene, as a formidable nanoparticle, has garnered great interests due to accruable superior properties in polymer nanocomposites (PNC). Application of organic coatings is the most available, and cost-efficient technique of enhancing the shelf-life of metallic structures. Shape memory polymeric materials are capable of being deformed, and arranged into a temporary shape, while also recovering their original configuration on exposure to external stimulation. Hence, the advent of self-repairing graphene PNC, coatings, and polymeric shape memory materials has enlarged the applications scope of these materials.     

高反式-1,4-聚异戊二烯与高密度聚乙烯共混型形状记忆材料研究

本文采用动态全硫化式 １,４ 聚异戊二烯（ＴＰＩ）和聚乙烯（ＰＥ）共混体系作了初步研究,制备了热刺激温度５０～１１０℃的热塑性形状记忆材料,提高了ＴＰＩ作为形状记忆材料的使用温度;采用静态硫化法,可制得热刺激温度５０～６０℃,力学性能优良的形状记忆材料。     

脆性材料强度统计分析中Weibull模数估计的试样数量的优化

为了全面的评价脆性材料强度特性指标,研究了强度统计方法中Weibull模数估计的试样数的优化问题。文中利用无偏极大似然估计理论结果,用置信度和相对误差双参数,计算出Weibull模数估计中的最优试样数,以便在Weibull模数估计试验中根据研究对象的要求,正确选用试样数量。文中结果在脆性材料强度特性评价与可靠性评价及其它适合Weibull统计的对象均可应用。