权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

EFFECT OF INTERFACIAL PROPERTIES ON STATIC AND FATIGUE OF SHORT GLASS FIBER REINFORCED THERMOPLASTICS

界面性能对短玻璃纤维增强热塑性塑料静态和疲劳的影响

基本信息

批准号：
06805010
负责人：
FUJII Toru
金额：
$ 1.47万
依托单位：
DOSHISHA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-06805010/
关键词：
FRTP Polypropylene Short fibers Long fiber pellets Static strength Fatigue Creep Low temperature plasma ガラス繊維熱可塑性樹脂界面水環境プラズマ処理

项目摘要

Firstly, the effect of interfacial properties between fibers and thermoplastic matrix (mainly Polypropylene) on static and fatigue failure of short glass fiber reinforced thermoplastics fabricated by injection molding and stamping was studied. From the test results it was revealed that the static strength of the FRTP sample fabricated using long fiber pellets was higher than that of the sample fabricated by conventional injection molding using short fiber pellets. The yielding stres was also increased by using long fiber pellets. However, the longitudinal modulus does not increase due to long fiber pellets. As fibers in the pellets are broken during injeciton molding process, 8 to 10 mm in length in pellets is enough to improve the static strength for long fiber pellets. On the other hand, no significant effect of usage of long fiber pellets on high cycle fatigue is found although long fiber pellets are effective to increase the fatigue life at low cycle fatigue. The fatigue life is in … More creased 30-80% longer by using long fiber pellets at low cycle fatigue. The creep behavior is also improved much due to long fibers.Although PP matrix itself does not absorb water, PP matrix short glass fiber composites (FRTP) absorbs appreciable water. Water penetrates inside through the interface between blass fibers and the matrix. Due to water absorption, not only static strength but also fatigue strength decrease. However, the strength reduction under static loading is only about 20%.A possibility for fabricating PP-based FRTP which have high performance but being not expensive was shown by using low temperature plasma. In this method, PP sheets whose surfaces have been previously treated are stacked with glass fabrics and pressed to form FRTP.Due to this surface treatment, peeling strength increases as high as 50%. The static strength increases about 20%.Lastly, the effect of rubber modification of epoxy matrix using cross-linked NBR submicron spheres on both static and fatigue strengths of CFRP were shown. Due to rubber modification, the interfacial strength between carbon fibers and epoxy matrix is improved. Less

首先，研究了纤维与热塑性基体（主要是聚丙烯）之间的界面性能对注射成型和冲压制备的短玻璃纤维增强热塑性塑料的静态和疲劳失效的影响。测试结果表明，使用长纤维颗粒制造的FRTP样品的静态强度高于使用短纤维颗粒通过常规注塑成型制造的样品。使用长纤维颗粒也增加了屈服应力。然而，纵向模量不会因长纤维颗粒而增加。由于颗粒中的纤维在注塑过程中被破坏，颗粒长度为8～10mm就足以提高长纤维颗粒的静态强度。另一方面，虽然长纤维颗粒可有效提高低周疲劳时的疲劳寿命，但没有发现使用长纤维颗粒对高周疲劳有显着影响。通过在低循环疲劳下使用长纤维颗粒，疲劳寿命延长 30-80%。由于长纤维的存在，蠕变行为也得到了很大改善。虽然PP基体本身不吸水，但PP基体短玻璃纤维复合材料（FRTP）吸收了相当多的水。水通过玻璃纤维和基体之间的界面渗透到内部。由于吸水，不仅静态强度下降，疲劳强度也下降。然而，静态载荷下的强度降低仅为20%左右。通过使用低温等离子体，显示了制造高性能但不昂贵的PP基FRTP的可能性。在该方法中，将表面经过预先处理的PP片材与玻璃织物堆叠并压制形成FRTP。由于这种表面处理，剥离强度提高高达50%。静态强度增加约20%。最后，显示了使用交联NBR亚微米球对环氧基体进行橡胶改性对CFRP的静态强度和疲劳强度的影响。由于橡胶改性，碳纤维与环氧基体之间的界面强度得到提高。较少的