扁平绕带压力容器环向与轴向强度的研究

采用较为简便的方法推导了绕带容器环向爆破压力公式，并对其进行了讨论；指出了环向强度略有降低，但无损于该容器的安全性；提出了工程上合适的缠绕倾角；并对绕带容器的铀向强度进行了分析论证。

钢带式高压容器的钢带强度分析

推导了钢带容器环向爆破压力公式并进行了讨论 ;对钢带容器环向进行了分析论证 ,指出了环向强度略有降低 ,但无损于该容器的安全性 ;并提出了工程上合适的缠绕倾角。

高强度聚烯烃管材成型方法的研究进展

介绍了7种高性能聚烯烃管材成型技术的原理及优缺点,这些成型方法主要通过改变加工过程中的温度场及应力场等来提高管材的环向强度。其中,三层复合管材旋转挤出成型技术是一种简单而有效生产高性能复合管材的成型技术,是未来生产高性能复合增强管材的一种趋势,该技术具有十分广阔的应用前景。

芯棒几何结构对旋转挤出聚乙烯管结构和性能的影响

在自行研制的新型旋转挤出加工装置的基础上,设计了凹槽型和螺纹型芯棒,对比研究了芯棒几何结构对聚乙烯(PE)管结构与性能的影响。实验结果表明,凹槽型芯棒不利于串晶的形成,而螺纹型芯棒对串晶的产生有明显促进效果。因而,在旋转挤出和螺纹型芯棒耦合作用下,可形成大量偏离轴向排列的串晶结构,从而提高PE管的环向强度。相较于常规挤出PE管,制备的PE管环向强度为29.3 MPa,提高幅度达34%。

生产高性能PVC-O管道效益高

PVC—O管是一种高性能的塑料管道，用于要求高耐压、高韧性的高端市场，如工业矿山等许多领域需求量大。PVC—O管道是通过特殊的取向加工工艺形成几乎加倍的环向强度（最高一级的MRS为50MPa，比PVC—U和PVC—M大100％）和明显改善的韧性。同样压力下材料消耗比PVC—U节约近50％，

玻璃钢管道在制碱工业上的应用

玻璃钢制品集中了玻璃纤维及合成树脂的优点,具有重量轻、强度高、耐酸碱盐及有机溶剂的性能,是一种性能优良的耐腐蚀材料。玻璃钢制品在石油、化工行业被广泛使用,主要的产品有:各种管道、罐、泵、阀和贮槽等,并在一定的范围内取代了碳钢、不锈钢和有色金属。

Strength failure and crack coalescence behavior of sandstone containing single pre-cut fissure under coupled stress, fluid flow and changing chemical environment

In order to study the strength failure and crack coalescence characteristics of cracked rocks, uniaxial compression experiments were conducted on cylindrical sandstone specimens, sampled from Longyou Grottoes of Zhejiang Province, China, with a single pre-cut crack soaking in different chemical solutions. Based on the results of uniaxial compressive test under different chemical solutions and velocities of flow, the effect of strength and deformation characteristics and main modes of crack coalescence for cracked rocks under chemical corrosion were analyzed. The results show that the pH value and velocity of the chemical solutions both have great influence on the sandstone sample's uniaxial compressive strength and deformation characteristics. Cracked sandstone samples are tension-destructed under uniaxial compression, and the crack propagation directions are consistent with the loading direction. The phenomena of crack initiation, propagation and coalescence of sandstone are well observed. Four different crack types are identified based on the crack propagation mechanism by analyzing the ultimate failure modes of sandstone containing a single pre-cut fissure. The failure process of specimen in air is similar with the specimen under chemical solutions, however, the initial time of crack occuring in specimen under chemical solutions is generally earlier than that in the natural specimen, and the crack propagation and coalescence process of specimen under chemical solutions are longer than those of the natural specimen due to softening of structure of rock caused by hydro-chemical action. Immersion velocity of flow and chemical solutions does not have influence on the ultimate modes of crack coalescence.