玻璃纤维毡增强热塑性塑料(GMT)作为一种新型的工程塑料得到越来越多的应用,使得GMT材料的成形性研究成为当前的一个主要研究方向.本文提出了一种加固冲压GMT板材的方法.GMT板材在冲压成形过程中被夹装到了金属薄板中间,金属薄板作为加热媒介的同时对GMT板材起到保护作用.本研究对GMT材料在不同温度条件下进行了拉伸试验,分析了温度对其拉伸变形的影响.进一步研究了覆盖有金属薄板的GMT材料在其冲压成形过程中温度对其深拉成形的影响.并利用有限元软件对其深拉深成形进行了模拟,分析了模拟与实验时拉深力随拉深深度的变化规律.%Given the increasing use of glass mat-reinforced thermoplastic (GMT) composites, the formability of GMT sheets is currently a topic of research. A new sheet forming process for solidified GMT was developed. In this process, a GMT sheet was sandwiched by dummy metallic sheets during deep drawing. The dummy metallic sheets acted as protective materials and media for heating the GMT sheet. In this study, tensile tests of GMT specimens were carried out under different temperature conditions. The effect of temperature on the tensile deformation was analyzed. The effect of temperature on the deep drawing process of GMT sheets with dummy sheets was further investigated. Finite element method (FEM) was conducted to simulate the deep drawing process. In the drawing force rising stage, the law of drawing force with the depth of the drawing was analyzed using FEM and experiments.
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