STUDY ON IMPROVEMENT OF MECHANICAL PROPERTIES OF CFRP DUE TO RUBBER MODIFICATION OF EPOXY MATRIX USING SUBMICRON SPHERES

亚微米球对环氧树脂基体进行橡胶改性改善CFRP力学性能的研究

• 批准号: 08650125
• 负责人: FUJII Toru
• 金额: $ 1.22万
• 依托单位: DOSHISHA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1997
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650125/
• 关键词: CFRP; RUBBER MODIFICATION; SUBMICRON SPHERES; CNBR; ADHESIVE STRENGTH; EPOXY RESIN; FATIGUE; INTER-LAMINAR STRENGTH; エポキン樹脂

Firstly, in order to obtain information on improvement of interfacial strength properties between rpoxy eesin and substrate due to rubber modification using submicron CNBR (Cross-linked acrylo Nitrile Butadiene Rubber : 70-100 nm in diameter) spheres, adhesive strenghts of an epoxy resin under Mode I loadings (both static and cyclic) were examined using DCB specimens. The experimental results revealed that The adhesive strength of the epoxy resin became maximum when the CNBR volume fraction was 10%. The interfacial strengths were greatly improved due to CNBR rubber modification under static loading as well as under cyclic loading when the fatigue crack growth rate was relatively high. In both cases, fracture occurred in a cohesive manner while interfacial failure occurred at low crack velocity including near threshold. In this case, the threshold was not improved due to rubber modification.Crabon fabric was used to evaluate the effect of rubber modification of epoxy matrix on strength … More properties of CFRP.The laminates used in the study were fabricated by the hand-lay-up method. Tensile and compressive strenghts under static loading and fatigue strength at several temperatures were measured as well as inter-laminar strength under Mode I loading. The following conclusions were drawn from the experiment. Mode I inter-laminar strength (fracture toughness) is greatly improved due to CNBR modification at a wide range of environmental temperature. It is more than two times higher than that for unmodified cases. Impact strength is also improved while on strength reduction in tension at any test temperature occurs as well as in compression. No reduction in Tg (glassy transition temperature) due to CNBR modification is found as well. That is one of reason for no degradaiton in both tensile and compressive strength properties. CNBR modification of epoxy matrix does not badly affects on the fatigue life of CFRP.Any life reduction was found due to inclusion of submicron spheres of CNBR. Less

首先，为了获得关于由于使用亚微米CNBR（交联丙烯腈丁腈橡胶：直径为70-100 nm）球的橡胶改性而改善环氧树脂与基底之间的界面强度性质的信息，使用DCB试样检查了在模式I载荷（静态和循环）下的环氧树脂的粘合强度。结果表明，CNBR体积分数为10%时，环氧树脂的粘接强度最大。CNBR橡胶改性后，在静载和疲劳裂纹扩展速率较高的循环载荷作用下，界面强度均得到显著提高。在这两种情况下，断裂发生在内聚的方式，而界面失效发生在低裂纹速度，包括近阈值。在这种情况下，由于橡胶改性，阈值并没有得到提高。采用克雷邦织物评价了橡胶改性环氧树脂基体对强度的影响 ...更多信息 研究中使用的层合板是通过手工铺叠法制造的。静态载荷下的拉伸和压缩强度和几个温度下的疲劳强度进行了测量，以及模式I加载下的层间强度。从实验中得出以下结论。由于CNBR改性，I型层间强度（断裂韧性）在很宽的环境温度范围内得到了很大的提高。它比未经修改的情况高出两倍多。冲击强度也得到了改善，而在任何测试温度下的拉伸强度和压缩强度都会降低。也没有发现由于CNBR改性而导致的Tg（玻璃化转变温度）降低。这是拉伸和压缩强度性能都没有下降的原因之一。CNBR对环氧树脂基体的改性对CFRP的疲劳寿命没有明显影响，但对CFRP疲劳寿命的影响主要是由于CNBR中的亚微米球的存在。少

项目成果

藤井 透 他: "エポキシ系接着剤のモードI荷重下における接着破面とフラクタル(第1報,静的き裂進展特性とフラクタル次元)" 日本機械学会論文集(A編). 62. 2594-2600 (1996)

Toru Fujii 等人：“I 型加载下环氧粘合剂的粘合剂断裂表面和分形（第 1 部分，静态裂纹扩展特性和分形维数）”日本机械工程师学会会议记录（编辑 A）62. 2594-。 2600 (1996)

Toru FUJII et.al.: "Effects of rubber modification of matrix and temperature on strength properties of cabon/epoxy composites" Proc,of MACM "98,The Int.Conf.on Marine Applications of Compo.Mate.(1998)

Toru FUJII 等人：“基体橡胶改性和温度对碳/环氧复合材料强度性能的影响”Proc,of MACM“98，The Int.Conf.on Marine applications of Compo.Mate.(1998)

Toru FUJII et.al.: "Effect of rubber modification of matrix and temperature on strength properties of cabon/epoxy composites" Proc. of MACM '97(USA). (1997)

Toru FUJII 等人：“基体橡胶改性和温度对碳/环氧复合材料强度性能的影响”Proc。

藤井 透 他: "エポキシ系接着剤のモードI荷重下における接着破面とフラクタル(第2報,疲労き裂進展特性とフラクタル次元)" 日本機械学会論文集(A編). 63. 893-900 (1997)

Toru Fujii 等：“I 型加载下环氧树脂粘合剂的粘合断裂面和分形（第 2 次报告，疲劳裂纹扩展特性和分形维数）” 日本机械工程学会会刊（A 版）63. 893-900。 (1997)

Toru FUJII et.al.: "Effect of Temperature and Crack Tip Opening Rate on Fracture Behavior of CNBR Modified Epoxy Adhesives under Mode I loading" SAE Tech. Paper Series 970661. (1997)

Toru FUJII 等人：“温度和裂纹尖端张开速率对 CNBR 改性环氧粘合剂在 I 型加载下断裂行为的影响”SAE Tech。