关于玻璃纤维的取向和成型品的异向1.doc

关于玻璃纤维的取向和成型品的异向性……（之三）Anisotropy caused by orientation of glass fiber *** (No.3)继续上一讲，本讲对玻璃纤维的取向和成型品的异向性进行说明。 本讲向您介绍玻璃纤维的取向与成型品机械物性的异向性之间的关系Following the previous issue, we are going to further illustrate anisotropy caused by the orientation of glass fiber. This time, we will show you the effect of glass-fiber orientation on the anisotropy in mechanical properties 械物性的异向性 　与成型收缩率一样，成型品机械方面的特性也受玻璃纤维取向的影响。下面的2个图表表示了夺钢GH-25拉伸强度和弯曲强度的异向性。从中可以看出：在流动方向的横向垂直方向上，成型品的强度（横向）只有流动方向的80%。如果成型品更薄或更细长，则异向性可能会更强。当然，其结果还因试片的形状和成型条件的不同而异。 〈试片的切取部位〉 ※ 以薄片浇口制作120×120×3的平板、并使用按图示角度切取的试片。 　下面再向您介绍一个例子。这是由本公司PBT树脂Duranex3300得到的数据，从中可以看出玻璃纤维取向的角度与拉伸强度和拉伸率之间的关系。  　如上所述，取向不同则物性会有很大不同，所以要考虑取向来进行浇口位置和制品的设计。另外，如果是本公司材料Vectra那样的结晶聚合物，则不但玻璃纤维会取向，而且树脂本身也会强烈取向，所以其异向性更加明显。对于结晶聚合物，在设计时要特别注意。 在实际制品中，树脂的流动情况非常复杂。由于成型条件与成型品形状一同产生影响，请您在设计时预测树脂的流动情况，在以往经验和知识的基础上判断强度和收缩率 Anisotropy in mechanical properties ? Like molding shrinkage, mechanical properties are also influenced by the orientation of glass fiber.The following two figures show the anisotropy of Duracon GH-25 in tensile and flexural strength respectively. It is understood from these figures that the strength in the direction perpendicular to flow is only arout 80% of that in the flow direction. It is estimated that the anisotropy is further intensified if a molding is thinner and/or longer. Needless to say, the result may differ depending on the shape of moldings and molding conditions. Positions of cutting out test specimens * Plaques of 120mm 120mm 3mm were injection molded through a film gate at first, and then the test specimens were cut out from these plaques as shown in the above figure. ? Another example will farther be introduced.The data shown below were obtained with our PBT resin Duranex 3300, in which the effect of glass-fiber orientation on tensile strength and tensile modulus of elasticity is shown.  ? As shown above, the properties are significantly changed by the degree of glass-fiber orient