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

• 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

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.

在聚丙烯冲压片材的弯曲断裂中，通过AE波的频率分析可以识别断裂机制的差异。采用该新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，为了研究该方法的有效性，还研究了其他复合材料，即聚芳酯纤维（AF）、芳纶纤维（KF）、玻璃纤维（GF）和碳纤维（CF）的单向增强成型部件。检查了。主要结果如下： (1)以环氧树脂为粘结剂的偶联剂成型件界面结合良好，界面脱粘现象很少。 (2)以不饱和聚酯和聚丙烯为粘合剂的偶联剂成型件出现大量的界面脱粘现象。 (3)CFRP的抗弯强度最高，GFRP也较高。 KFRP的弯曲强度是CFRP和GERP的一半。AFRP的弯曲强度最低。 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，这些复合材料具有较高的弹性模量。 (4)由于AFRP和KFRP采用延性断裂纤维增强，因此在弯曲断裂中间发生颈缩，截面变小。在达到最大载荷之前，由于界面脱粘，载荷-位移曲线的梯度变得平缓。 (5)由于CFRP和GFRP采用脆性断裂纤维增强，在最大载荷附近发生压缩断裂，断裂变得活跃。

项目成果

藤原順介: "ガラス長繊維マット強化ポリプロピレン樹脂シートによる平板製品の成形性" 日本複合材料学会誌. 21. 189-196 (1995)

Junsuke Fujiwara：“使用长玻璃纤维毡增强聚丙烯树脂片材的平板产品的成型性”日本复合材料学会杂志 21. 189-196 (1995)。

藤原順介: "ガラス長繊維マット強化ポリプロピレン樹脂シートによるコップ状製品の成形性" 日本複合材料学会誌. 21. 181-188 (1995)

Junsuke Fujiwara：“使用长玻璃纤维毡增强聚丙烯树脂片材的杯形产品的成型性”日本复合材料学会杂志，21. 181-188 (1995)。