• Title/Summary/Keyword: CFRP(carbon fiber reinforced plastics)

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A Study on the Removal of CFRP Machining Defects by Various Tool Geometries (공구 형상에 따른 CFRP의 가공결함 제거에 관한 연구)

  • Park, Ki Moon;Ko, Tae Jo;Yu, Zhen;Kumaran S, Thirumalai
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.16 no.4
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    • pp.16-23
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    • 2017
  • CFRP(Carbon Fiber Reinforced Plastics) has many industrial applications due to its low weight and high strength properties. Due to its superior properties, for example, excellent resistance to fatigue wear, corrosion, and breakage from fatigue, it has been widely applicable to aircraft, automotive, and medical industries and so on. The main machining for CFRP is drilling, and route milling. In case of drilling, the machining defects such as the delamination of each layer, uncut fiber, resin burning, spalling, and exit burrs are inevitable. The issue to remove such kind of defects is necessary to make CFRP parts successful. From this point of view, this paper investigates the removal effectiveness of machining defects existing at exit region with different type of tool geometries. Consequently, based on the experiments, the tool geometry is most impact factor to remove uncut fiber or resin.

Nondestructive Evaluation of the Turbine Blade of Wind Energy By Using T-Ray (T-ray를 이용한 풍력터빈 브레이드 비파괴결함평가)

  • Im, Kwang-Hee;Jeong, Jong-An;Hsu, David K.;Lee, Kil-Sung
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.1
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    • pp.102-108
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    • 2012
  • A study of terahertz waves (T-ray) was made for the nondestructive evaluation of FRP (Fiber reinforced plastics) composite materials. The to-be-used systems were time domain spectroscopy (TDS) and continuous wave (CW). The composite materials investigated include both turbine blades of wind energy (non-conducting polymeric composites) and conducting carbon fiber composites. Terahertz signals in the TDS mode resembles that of ultrasound; however, unlike ultrasound, a terahertz pulse was not able to detect a material with conductivity. This was demonstrated in CFRP (Carbon fiber reinforced plastics) laminates. Refractive index (n) was defined as one of mechanical properties; so a method was solved in order solve the "n" in the material with the cut parts of the turbine blades of wind energy. The defects and anomalies investigated by terahertz radiation were foreign material inclusions and simulated disband. Especially, it is found that the T-ray went through the turbine blade with greater thickness (about 90mm).

Drilling Characteristic depend on the Orientation Angle of CFRP Composite material (CFRP복합재료의 적층각에 따른 가공 특성)

  • 정성택;박종남;김선진;조규재
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2002.04a
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    • pp.649-654
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    • 2002
  • In recent days the more use of CFRP composite is in the airplane, automobile, and sport goods , etc., the more necessity of research on it in this engineering. In this research, the CFRP composite specimen are fabricated by 48 CFRP plies with 8 orientation angles, and the specimens are drilled with 3 tools. The results are analyzed with consideration of cutting force, type of tools and fabrication condition. The specimens with each drilling conditions are also investigated with SEM. The optimal drilling conditions such as drill types and cutting fence with respect to the fabricating condition are studied.

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Collapse Characteristics of CFRP Hat Shaped members According to Variation of Interface Numbers under the Hygrothermal Environment (고온.고습 환경 하에서의 계면수 변화에 따른 CFRP모자형 단면 부재의 압궤특성)

  • Yang, Yong-Jun;Cha, Cheon-Seok;Yang, In-Young
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.3
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    • pp.241-247
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    • 2009
  • It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of a structure members in automobiles. We have studied to investigate collapse characteristics and moisture absorption movements of CFRP(Carbon Fiber Reinforced Plastics) hat shaped sectional members when CFRP laminates are under the hygrothermal environment. In particular, the absorbed energy, mean collapse load and deformation mode were analyzed for side members which absorbed most of the collision energy. Variation of CFRP interlaminar numbers is important to increase the energy absorption capability. Therefore we have made a static collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed.

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A Study on the Estimation of Dynamic Interlaminar Fracture Toughness on CFRP Laminates Plates (CFRP 적층판의 동적 층간파괴인성의 평가법)

  • 김지훈;김영남;판부직규;양인영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.6 no.2
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    • pp.80-91
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    • 1998
  • In this paper, the estimation of dynamic interlaminar fracture toughness on fracture mode II in CFRP(carbon fiber reinforced plastics) laminates in made. Dynamic ENF(End Notched Flexure) apparatus used in this paper is manufactured by suing Split Hopkinson Pressure Bar. The static and impact load history in the CFRP specimen is measured by using manufactured dynamic ENF tester and 3-point bending test is carried out to find the load history. Also dynamic interlaminar fracture toughness can be found by using the J integral obrained from dynamic analysis in consideration of intertia-force effect.

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A Study on the Drilling CFRP Composite laminates fabricated with Orientation Angle (CFRP 복합재료의 배열각에 따른 드릴가공에 관한 연구)

  • 정성택;박종남;조규재
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2002.05a
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    • pp.960-963
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    • 2002
  • In recent days the more use of CFRP composite is in the airplane, automobile, and sport goods, etc., the more necessity of research on it in this engineering. In this research, the CFRP composite specimen are fabricated by 48 CFRP plies with 8 orientation angles, and the specimens are drilled with 3 tools. The results are analyzed with consideration of cutting force, type of tools and fabrication condition. The specimens with each drilling conditions are also investigated with SEM. The optimal drilling conditions such as drill types and cutting force with respect to the fabricating condition are studied.

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Collapse Characteristics of CFRP Hat Shaped Members under the Hygrothermal Environment According to Stacking Angle (열습환경 하에서의 적층각도 변화에 따른 CFRP 모자형 단면부재의 압궤특성)

  • Yang, Yong-Jun;Yang, In-Young;Sim, Jae-Ki
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.18 no.5
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    • pp.507-513
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    • 2009
  • It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of structure members in automobiles. We have investigated collapse characteristics and moisture absorption movements of CFRP(Carbon Fiber Reinforced Plastics) hat shaped sectional members when CFRP laminates are under the hygrothermal environment. The absorbed energy, mean collapse load and deformation mode were analyzed for side members which absorbed most of the collision energy. Therefore we have made a static collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed specimen.

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Design of CFRP-Metal Hybrid Pantograph Upper-arm (탄소섬유 복합재료-금속 하이브리드 팬터그래프 상부암 설계)

  • Jeon, Seung-Woo;Han, Min-Gu;Chang, Seung-Hwan;Cho, Yong-Hyeon;Park, Chul-min
    • Composites Research
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    • v.28 no.5
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    • pp.327-332
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    • 2015
  • In this research, a parametric study was carried out to design a metal-carbon fiber reinforced plastics (CFRP) hybrid pantograph for weight reduction of high speed train (KTX). To design a light-weight and high-stiffness pantograph, some parts of the original steel upper arm was replaced by CFRPs with appropriate stacking sequences. For the parametric study, steel was replaced by aluminium considering structure stiffness and weight of hybrid upperarm of a pantograph. Finite element analysis (FEA) was performed for checking the structure stiffness with varying design parameters. Static vertical load stiffness and weight changing ratio were derived from real CX-PG pantograph model analyses. From the FEA results, the geometries of high-stiffness, light-weight pantograph have been suggested.

Development of Curing Process for EMC Encapsulation of Ultra-thin Semiconductor Package (초박형 반도체 패키지의 EMC encapsulation을 위한 경화 공정 개발)

  • Park, Seong Yeon;On, Seung Yoon;Kim, Seong Su
    • Composites Research
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    • v.34 no.1
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    • pp.47-50
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    • 2021
  • In this paper, the Curing process for Epoxy Molding Compound (EMC) Package was developed by comparing the performance of the EMC/Cu Bi-layer package manufactured by the conventional Hot Press process system and Carbon Nanotubes (CNT) Heater process system of the surface heating system. The viscosity of EMC was measured by using a rheometer for the curing cycle of the CNT Heater. In the EMC/Cu Bi-layer Package manufactured through the two process methods by mentioned above, the voids inside the EMC was analyzed using an optical microscope. In addition, the interfacial void and warpage of the EMC/Cu Bi-layer Package were analyzed through C-Scanning Acoustic Microscope and 3D-Digital Image Correlation. According to these experimental results, it was confirmed that there was neither void in the EMC interior nor difference in the warpage at room temperature, the zero-warpage temperature and the change in warpage.

Evaluation of Material Properties about CFRP Composite Adapted for Wind Power Blade by using DIC Method (풍력발전기 블레이드 적용 CFRP 복합재료의 DIC 방법에 의한 재료특성치 평가)

  • Kang, J.W.;Kwon, O.H.;Kim, T.K.;Cho, S.J.
    • Journal of Power System Engineering
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    • v.14 no.5
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    • pp.17-23
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    • 2010
  • In recent, the capacity of a commercial wind power has reached the range of 6 MW, with large plants being built world-wide on land and offshore. The rotor blades and the nacelle are exposed to external loads. Wind power system concepts are reviewed, and loadings by wind and gravity as important factors for the mechanical performance of the materials are considered. So, the mechanical properties of fiber composite materials are discussed. Plain woven fabrics Carbon Fiber Reinforced Plastics (CFRP) are advanced materials which combine the characteristics of the light weight, high stiffness, strength and chemical stability. However, Plain woven CFRP composite have a lot of problems, especially delamination, compared with common materials. Therefore, the aim of this work is to estimate the mechanical properties using the tensile specimen and to evaluate strain using the CNF specimen on plain woven CFRP composites. For the strain, we tried to apply to plain woven CFRP using Digital Image Correlation (DIC) method and strain gauge. DIC method can evaluate a strain change so it can predict a location of fracture.