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New estimation method for formability of stampable sheet part by frequency analysis of AE

AE频率分析估计可冲压板件成形性的新方法

基本信息

批准号：
07650143
负责人：
FUJIWARA Junsuke
金额：
$ 1.54万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650143/
关键词：
Stampable sheet Heating flow molding Molding processing AE Formability Frequency analysis キャビティ内圧力

项目摘要

In bending fracture of Polypropylene stampable sheet, it is possible to recognize the difference of fracture mechanism by frequency analysis of AE wave. In bending fracture of PET stampablie sheets which have different coupling agents of glass fibers, the difference of the interface bonding was investigated by this new method. Moreover, in order to investigate the effectiveness of this method, other composites, that is to say, unidirectional reinforced molded parts with Polyallelate fiber (AF), Aramid fiber (KF), Glass fiber (GF), and Carbon fiber (CF) were examined. The main results obtained are as follows : (1) The mouled part whose coupling agent was the binder for epoxy resin showed good interface bonding, and there was little interface debonding. (2) The molded parts whose coupling agent was the binder for unsaturated polyester and polypropylene, showed a lot of interface debonding. (3) The bending strength of CFRP was highest and GFRP was also rather high. The bending strength of KFRP was half of CFRP and GERP.The bending strength of AFRP was lowest. The elastic modulus of CFRP was highest. The elastic modulus of AFRP was lowest. As compared with the elastic modulus of Epoxy resin, these composites had high elastic modulus. (4) As AFRP and KFRP were reinforced with ductile fracture fibers, the cross section became small because of necking in the middle of the bending fracture. Before the maximum load, the gradient of the load-displacement curve became gentle because of the interface debonding. (5) As CFRP and GFRP were reinforced with brittle fracture fibers, the compressive fracture occurred in the vicinity of the maximum load and the fracture became active.

在聚丙烯冲压板弯曲断裂中，通过声发射波的频率分析，可以识别断裂机理的差异。用这种新的方法研究了不同玻璃纤维偶联剂的PET冲压片材弯曲断裂时界面结合的差异。此外，为了研究这种方法的有效性，其他复合材料，也就是说，单向增强模塑部件与聚烯丙二酸酯纤维（AF），芳族聚酰胺纤维（KF），玻璃纤维（GF），和碳纤维（CF）进行了检查。主要研究结果如下：（1）以偶联剂为环氧树脂粘结剂的注塑件界面结合良好，界面脱粘现象少。(2)以偶联剂为粘结剂的不饱和聚酯和聚丙烯的模塑制品，界面脱粘现象严重。(3)CFRP的抗弯强度最高，GFRP的抗弯强度也较高。KFRP的抗弯强度只有CFRP和GERP的一半，AFRP的抗弯强度最低。CFRP的弹性模量最高。AFRP的弹性模量最低。与环氧树脂的弹性模量相比，该复合材料具有较高的弹性模量。(4)当AFRP和KFRP被韧性断裂纤维增强时，由于弯曲断裂中间的颈缩，横截面变小。在最大载荷之前，由于界面脱粘，载荷-位移曲线的斜率变得平缓。(5)当CFRP和GFRP中加入脆性断裂纤维后，压缩断裂发生在最大载荷附近，断裂变得活跃。