Evaluation of the Fiber/Matrix Interfacial Strength in CFRTP by Push-out Test Technique Using Nanoindenter

Journal of the Japan Society for Composite Materials Pub Date : 2020-11-15 DOI:10.6089/jscm.46.247

H. Hohjo, Taiki Kano, Takashi Sasagawa, Hiroo Mochizuki, Tomoyuki Koga, T. Ohta, H. Makino

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Abstract

: The fiber/matrix interfacial strength in discontinuous carbon fiber reinforced thermo-plastics was evaluated by a push-out test using a nanoindenter. Two types of composites were prepared.Theyweremolded using polypropylenereinforced bydiscontinuous carbon fibers using differentsurfacetreatments.Thinpolishedspecimenswithathicknessof20μmwereprepared.The load-displacement curves wereobtained byextruding carbon fiberwith a custom-madeflat-ended push rod attached to thenanoindenter.Theprocess ofinterfacialdebonding fracturewasnumeri-callysimulated bythecohesivezonemodel,using themixed-modecriticalenergyreleaserateasa criterion. In addition, interfacial shear strengths were evaluated using the feature points of the measured load-displacement curve.It can beconcluded from the results that the higher the interfacial shear strength, the higher the macroscopic tensile strength. Subsequently, Kelly-Tysonʼs theorywasused to predict themacroscopictensilestrengths.Thepredictedtensilestrengthsofthe composites werealmost consistent with thepracticalvalues. る上で重要な信頼性を支配する要因の一つは，繊維と樹

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用纳米压头推出测试技术评价CFRTP纤维/基体界面强度

采用纳米压头推出试验，对不连续碳纤维增强热塑性塑料的纤维/基体界面强度进行了评价。制备了两种类型的复合材料。采用不同表面处理的不连续碳纤维增强聚丙烯进行成型，制备了厚度为20μm的薄抛光样品。通过将定制的端部推杆连接到压头上挤压碳纤维，获得了载荷-位移曲线。采用混合模型临界能量释放准则，采用综合区域模型对界面脱粘裂缝过程进行了数值模拟。此外，利用实测荷载-位移曲线特征点对界面抗剪强度进行了评价。结果表明，界面抗剪强度越高，宏观抗拉强度越高。随后，凯利-泰森的理论被用于预测宏观拉伸强度。预测的复合材料抗拉强度与实际值基本一致。(一)、(二)、(二)、(二)、(二)、(二

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Journal of the Japan Society for Composite Materials

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