• Title/Summary/Keyword: Micro-tensile bonding strength

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Mechanical Properties and Fracture Behavior of Cylindrical Shell Type for Unidirectional CFRP Composite Material under Tension Load (원통형 셀 구조를 갖는 한방향 CFRP 적층 복합재료의 정적인장파괴거동)

  • 오환섭
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.273-278
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    • 1998
  • In this paper, basic micro-mechanical properties of unidirectional CFRP composite shell such as bonding strength, fiber volume fraction and void fraction are measured and tensile strength test is performed with a fixture. And then fracture surfaces are observed by SEM. In case of basic micro-mechanical properties, bonding strength is reduce with decreasing of radius of each ply in a shell for the effect of residual stress, fiber volume fraction is smaller than plate, and void fraction is vise versa. For these reason, tensile strength of shell is smaller than plate fabricated with same prepreg. For failure mode shell has many splitted part along its length, and it is assumed that this phenomenon is caused by the difference of bonding strength for residual stress.

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Deformation Properties of Gold Bonding Wire for VLSI Packaging Applications (반도체 패키징용 Gold Bonding Wire의 변형특성 및 해석)

  • Kim K.;Hong S. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2001.05a
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    • pp.250-253
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    • 2001
  • Mechanical properties of gold bonding wire for VLSI packaging have been studied. The diameters of gold wires are about 20-30 micrometer and fracture loads are 8-20 gram force. The elastic modulus, yield strength, fracture strength and elongation properties have been evaluated by micro-tensile test method. This work discusses for an appropriate selection of micro-force testing system and grip design in mim testing. The best method to determine gauge length of wire and to measure tensile properties has been proposed. The mechanical properties such as strength and elastic modulus of current gold bonding wire are higher than pure those of gold wire.

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Variations of micro-structures and mechanical properties of Ti/SUS321L joint using brazing method (브레이징을 이용한 Ti/SUS321L 접합체의 기계적 특성과 미세조직의 변화)

  • 구자명;정우주;한범석;정승부
    • Proceedings of the KWS Conference
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    • 2002.05a
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    • pp.285-287
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    • 2002
  • This study is investigated in variations of micro-structures and mechanical properties of Ti/SUS321L joint with bonding temperature and time using brazing method. According to increasing bonding temperature and time, it was observed the thickness of their reaction layer increased. In tensile test, it was examined that the tensile strength had maximum value at the bonding time of 5min and decreased after bonding time over 5min because of increasing their oxides and intermetallic compounds.

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Effects of the Glass Fiber Characteristics on the Mechanical Properties of Thermoplastic Composite (유리섬유의 특성이 열가소성 복합재료의 기계적 성질에 미치는 영향)

  • Lee, Jung-Hui;Lee, Jeong-Gwon;Lee, Gyeong-Yeop
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.7 s.178
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    • pp.1697-1702
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    • 2000
  • This study has been performed to investigate the effects of glass fiber characteristics on the mechanical properties of thermoplastic composite. The surface of glass fiber was coated with the silan e to enhance the bonding strength between fiber and matrix. A micro-droplet pull-off test was performed to investigate the influence of the silane concentration on the bonding strength. The maximum bonding strength was observed around 10.8% silane concentration. In order to examine the influence of the fiber length and fiber content on the properties of the composite, the composite materials involving tile fiber lengths of 5mm, 10mm, 15mm 20mm, and 25mm were tested. The composites used contain 20%, 30%, and 40% by weight of glass fibers. Tension and flexural tests were performed to investigate their mechanical properties of the composites. The tensile strength and tensile modulus of the composite increase with increasing the glass fiber content. The tensile modulus increases slightly with increasing the fiber length. The maximum tensile strength is observed around the fiber length of 15-20mm. The flexural modulus and strength also increase slightly with increasing the fiber length.

Effect of Tio2 particles on the mechanical, bonding properties and microstructural evolution of AA1060/TiO2 composites fabricated by WARB

  • Vini, Mohamad Heydari;Daneshmand, Saeed
    • Advances in materials Research
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    • v.9 no.2
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    • pp.99-107
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    • 2020
  • Reinforced aluminum alloy base composites have become increasingly popular for engineering applications, since they usually possess several desirable properties. Recently, Warm Accumulative Roll Bonding (WARB) process has been used as a new novel process to fabricate particle reinforced metal matrix composites. In the present study, TiO2 particles are used as reinforcement in aluminum metal matrix composites fabricated through warm accumulative roll bonding process. Firstly, the raw aluminum alloy 1060 strips with TiO2 as reinforcement particle were roll bonded to four accumulative rolling cycles by preheating for 5 min at 300℃before each cycle. The mechanical and bonding properties of composites have been studied versus different volume contents of TiO2 particles by tensile test, peeling test and vickers micro-hardness test. Moreover, the fracture surface and peeling surface of samples after the tensile test and peeling test have been studied versus different amount of TiO2 volume contents by scanning electron microscopy. The results indicated that the strength and the average vickers micro-hardness of composites improved by increasing the volume content of TiO2 particles and the amount of their elongation and bonding strength decreased significantly.

Scarf Welding of Thin Substrates and Evaluation of the Tensile Properties (박형 기판의 사면 접합 공정 및 인장 특성 평가)

  • Beomseok Kang;Jeehoo Na;Myeong-Jun Ko;Minjeong Sohn;Yong-Ho Ko;Tae-Ik Lee
    • Journal of the Microelectronics and Packaging Society
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    • v.30 no.3
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    • pp.102-110
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    • 2023
  • This paper introduces scarf welding process of thin substrates using flexible laser transmission welding (f-LTW) technology. We examined the behavior of tensile strength relative to the scarf angle for flexible applications. Thin plastic substrates with the thickness of less than 100 ㎛ were bonded and a jig to form a slope at the edge of the substrate was developed. By developing the scarf welding process, we successfully created a flexible bonding technology that maintains joint's thickness after the process. The tensile strength of the joint was assessed through uniaxial test, and we found that the tensile strength increases as the slope of bonding interface decreases. By conducting stress analysis at the bonding interface with respect to the slope angle, design factor of bonding structure was investigated. These findings suggest that the tensile strength depends on the geometry of the joint, even under the same process conditions, and highlights the significance of considering the geometry of the joint in welding processes.

Variations of Micro-Structures and Mechanical Properties of Ti/STS321L Joint Using Brazing Method (브레이징을 이용한 Ti/STS321L 접합체의 미세조직과 기계적 특성의 변화)

  • 구자명;정우주;한범석;권상철;정승부
    • Journal of Welding and Joining
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    • v.20 no.6
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    • pp.106-106
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    • 2002
  • This study investigated variations of micro-structures and mechanical properties of Ti / STS321L joint with various bonding temperature and time using brazing method. According to increasing bonding temperature and time, it was observed that the thickness of their reaction layer increased due So increasing diffusion rate and time. From the EPMA results, Ti diffused to the STS321L substrate according to increasing bending time to 30min. Hardness of bonded interface increased with increasing bonding temperature and time due to increasing their oxides and intermetallic compounds. XRD data indicated that Ag, Ag-Ti intermetallic compounds, TiAg and Ti₃Ag and titanium oxide, TiO₂were formed in interface. In tensile test, it was found that the tensile strength had a maximum value at the bonding temperature of 900℃ and time of 5min, and tensile strength decreased over bonding time of 5min. The critical thickness of intermetallic compounds was observed to about 30㎛, because of brittleness from their excessive intermetallic compounds and titanium oxide, and weakness from void.

Variations of Micro-Structures and Mechanical Properties of Ti/STS321L Joint Using Brazing Method (브레이징을 이용한 Ti/STS321L 접합체의 미세조직과 기계적 특성의 변화)

  • 구자명;정우주;한범석;권상철;정승부
    • Journal of Welding and Joining
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    • v.20 no.6
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    • pp.830-837
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    • 2002
  • This study investigated variations of micro-structures and mechanical properties of Ti / STS321L joint with various bonding temperature and time using brazing method. According to increasing bonding temperature and time, it was observed that the thickness of their reaction layer increased due So increasing diffusion rate and time. From the EPMA results, Ti diffused to the STS321L substrate according to increasing bending time to 30min. Hardness of bonded interface increased with increasing bonding temperature and time due to increasing their oxides and intermetallic compounds. XRD data indicated that Ag, Ag-Ti intermetallic compounds, TiAg and $Ti_3Ag$ and titanium oxide, $TiO_2$ were formed in interface. In tensile test, it was found that the tensile strength had a maximum value at the bonding temperature of $900^{\circ}C$ and time of 5min, and tensile strength decreased over bonding time of 5min. The critical thickness of intermetallic compounds was observed to about $30\mu\textrm{m}$, because of brittleness from their excessive intermetallic compounds and titanium oxide, and weakness from void.

Tensile Strength Properties of the Diffusion Bonding Copula Shape for Micro PCD Tool Fabrication (초소형 PCD 공구 제작을 위한 확산접합부의 형상에 따른 인장강도 특성)

  • Jeong, Ba Wi;Kim, Uk Su;Chung, Woo Seop;Park, Jeong Woo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.25-30
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    • 2015
  • This study involved the fabrication of precision machine tools using a polycrystalline diamond tip [sintered PCD and cemented carbide (WC-Co) tip] and WC-Co shanks via diffusion bonding with a paste-type nickel alloy filler metal. Diffusion bonding is a process whereby two materials are pressed together at high temperature and high pressure for a sufficient period of time to allow significant atomic diffusion to occur. For smooth progress, a filler metal of nickel alloy was used at the interface. Optical microscopy images were used to observe the copula of the bonded layer. It was confirmed that cracks occurred near the junction in all cases. The tensile strength of the bond was measured using a universal testing machine (UTM) with WC-Co proportional test specimens.

Fabrication and Mechanical Properties of TiNi/Al2024 Composites by Hot-Press Method (고온 프레스법에 의한 TiNi/Al2024 복합재료의 제조 및 기계적 특성평가)

  • Son, Yong-Kyu;Bae, Dong-Su;Park, Young-Chul;Lee, Gyu-Chang
    • Transactions of Materials Processing
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    • v.18 no.1
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    • pp.45-51
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    • 2009
  • Shape memory alloy has been used to improve the tensile strength of composite by the occurrence of compressive residual stress in matrix using its shape memory effect. In order to fabricate shape memory alloy composite, TiNi alloy fiber and Al2024 sheets were used as reinforcing material and matrix, respectively. In this study, TiNi/Al2024 shape memory alloy composite was made by using hot press method. In order to investigate bonding condition between TiNi reinforcement and Al matrix, the micro-structure of interface was observed by using optical microscope and diffusion layer of interface was measured by using Electron Probe Micro Analyser. And the mechanical properties of composite with three parameters(volume fraction of fiber, cold rolling amount and test temperature) were obtained by tensile test. The most optimum bonding condition for fabrication the TiNi/Al2024 composite material was obtained as holding for 30min. under the pressure of 60MPa at 793K. The strength of composite material increased considerably with the volume fraction of fiber up to 7.0%. And the tensile strength of this composite increased with the reduction ratio and it also depends on the volume fraction of fiber.