Experimental investigation of stamp forming of unconsolidated commingled E-glass/polypropylene fabrics
Experimental investigation of stamp forming of unconsolidated commingled E-glass/polypropylene fabrics
复制标题
DOI：
10.1016/j.compscitech.2005.05.036
复制
发表时间：
2006-03-01
影响因子：
9.1
通讯作者：
Gagnon, P
中科院分区：
文献类型：
--
作者：
Trudel-Boucher, D;Fisa, B;Gagnon, P
针对简单的模具几何形状，研究了标称重量为 743 和 1485 g/m(2) 的两种未固结混合无碱玻璃纤维/聚丙烯织物复合材料的冲压成型。在这种制造过程中，未固结的混合织物直接从烘箱转移到压机，在压机中使用匹配模具的金属模具对它们进行冲压，以实现同时固结和符合模具形状。在本研究中，确定了冲压压力、冲压温度、模具温度、加载速率和保压时间等冲压参数对弯曲性能、空隙含量和空隙分布的影响。将未固结织物的冲压成形过程获得的结果与通过未固结织物的压缩成型和冲压预固结织物获得的结果进行比较。对于具有较高标称重量的织物，发现弯曲性能低于最佳性能，而对于具有较低标称重量的织物，弯曲性能相当于通过压缩成型确定的最佳性能。在弯曲性能的变化和空隙率的变化之间发现了良好的对应关系。这样可以仅通过测量空隙含量来近似机械性能。最后，确定了为了成功加工松散织物而必须施加冲压压力的最低温度。 (c) 2005 Elsevier Ltd. 保留所有权利。
Stamp forming of two unconsolidated commingled E-glass fiber/polypropylene fabric composites with nominal weights of 743 and 1485 g/m(2) has been studied for simple mold geometry. For this manufacturing process, unconsolidated commingled fabrics are transferred directly from an oven to a press where they are stamped using a matched-dies metal mold to achieve simultaneous consolidation and conformation to the mold shape. In this study, the influence of the stamping parameters such as the stamping pressure, stamping temperature, mold temperature, loading rate and holding time are determined on the flexural properties, void content and void distribution. Results obtained for the stamp forming process of the unconsolidated fabrics were compared with results obtained by compression molding of the unconsolidated fabrics and by stamping pre-consolidated fabrics. For the fabric with the higher nominal weight, the flexural properties were found to be lower than the optimal properties, while for the fabric with the lower nominal weight the flexural properties were equivalent to the optimal properties determined by compression molding. Good correspondence was found between the variation of the flexural properties and the variation of the void content. This allows the mechanical properties to be approximated by only measuring the void content. Finally, the minimum temperature at which the stamping pressure has to be applied in order to successfully process the unconsolidated fabrics is determined. (c) 2005 Elsevier Ltd. All rights reserved.