• Title, Summary, Keyword: Tensile properties

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Effect of Atmospheric Plasma Treatments on Mechanical Properties of VGCF/Epoxy

  • Khuyen, Nguyen Quang;Kim, Jin-Bong;Kim, Byung-Sun;Lee, Soo
    • Advanced Composite Materials
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    • v.17 no.2
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    • pp.167-175
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    • 2008
  • Vapor grown carbon fibers (VGCF) were treated with atmospheric plasma enhancing the surface area in order to improve the bonding to the matrix in epoxy composites. The changes in the mechanical properties of VGCF/epoxy nanocompostes, such as tensile modulus and tensile strength were investigated in this study. VGCF with and without atmospheric plasma treatment for surface modification were used in this investigation. The interdependence of these properties on the VGCF contents and interfacial bonding between VGCF/epoxy matrix were discussed. The mechanical properties of atmospheric plasma treated (APT) VGCF/epoxy were compared with raw VGCF/epoxy. The tensile strength of APT VGCF/epoxy nanocomposites showed higher value than that of raw VGCF. The tensile strength was increased with atmospheric plasma treatment, due to better adhesion at VGCF/epoxy interface. The tensile modulus of raw VGCF and APT VGCF/epoxy matrix were of the similar value. The dispersion of the VGCF was investigated by scanning electron microscopy (SEM), SEM micrographs showed an excellent dispersion of VGCF in epoxy matrix by ultrasonic method.

Strain Rate Effect on the Tensile Properties of Steel Fiber Hybrid Reinforced Cement Composites (강섬유를 하이브리드 보강한 섬유보강 시멘트복합체의 인장특성에 미치는 변형속도의 영향)

  • Kim, In-Ho;Kim, Gyu-Yong;Lee, Sang-Kyu;Son, Min-Jae;Kim, Gyeong-Tae;Nam, Jeong-Soo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • pp.87-88
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    • 2018
  • In this study, the tensile properties of single and hybrid fiber reinforced cement composite according to strain rate was evaluated. Experimental results, in the strain rate 10-6/s, fiber reinforced cement composite showed improved of tensile strength and decrease of strain at peak stress as SSF volume content increased. In the strain rate 101/s, the single and hybrid reinforced cement composite's tensile properties are improved, because of the improved bond strength between the fiber and matrix. And hybrid fiber reinforced cement composite showed high energy absorption capacity, because the SSF prevented the cracking and fracture of the surrounding matrix when during the HSF pull-out.

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Tensile Properties of Carbon-Glass/Epoxy Hybrid Laminates Produced by VARTM (VARTM 법으로 제작한 탄소-유리/에폭시 하이브리드 적층재의 인장 특성)

  • Kim, Yonjig
    • Korean Journal of Metals and Materials
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    • v.49 no.10
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    • pp.760-765
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    • 2011
  • This paper presents a study of the tensile behavior of carbon and glass fiber reinforced epoxy hybrid laminates manufactured by vacuum assisted resin transfer molding (VARTM). The objective of this study was to develop and characterize carbon fiber reinforced plastic hybrid composite material that is low cost and light-weight and that possesses adequate strength and stiffness. The effect of position and content of the glass fabric layer on the tensile properties of the hybrid laminates was examined. The strength and stiffness of the hybrid laminates showed a steady decrease with an increase of the glass fabric content this decrease was almost linear. Fracture strain of these laminates showed a slight increasing trend when glass fabric content was increased up to 3 layers, but at a glass fabric content > 3 layers the strain was almost constant. When glass fabric layers were at both outer surfaces, the hybrid laminate exhibited a slightly higher tensile strength and elastic modulus due to the small amount of glass yarn pull-out.

A Study on the Tensile Property of Ring Specimen Having Gauge Length (평행부를 갖는 링 시험편의 인장특성 고찰)

  • Bae Bong-Kook;Koo Jae-Mean;Seok Chang-Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.4
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    • pp.555-562
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    • 2005
  • In this study, we tried to establish the method of evaluating the tensile properties of the ring specimen of Arsene which have gauge length. In this result, we verified the availability of central piece. We made ring specimens and devices such as central piece, pins, and clevises. A proper tensile speed was determined by pre-test. The result of main test was calibrated and compared with the result of FEM. To obtain the tensile properties from the ring test result, we observed two relationships: one is strain-displacement and the other is load ratio-displacement. The tensile properties could be evaluated by using these relationships.

Tensile Characteristics of Silane-modified MMT/epoxy Nanocomposites (실란처리 된 MMT/에폭시 나노복합재의 인장특성)

  • Ha, Sung-Rok;Chung, Hyup-Jae;Rhee, Kyong-Yop
    • Journal of the Korean Society for Precision Engineering
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    • v.23 no.11
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    • pp.103-107
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    • 2006
  • It is well-known that the mechanical properties of MMT(montmorillonite) nanocomposites are better than those of conventional composites. In this study, tensile tests were performed to determine the effect of silane modification of MMT and its weight ratio on the tensile properties of MMT/epoxy nanocomposites. It was found that the tensile strength and the elastic modulus of MMT/epoxy nanocomposites increased with increasing weight ratio of MMT. The elastic modulus of silane-modified MMT/epoxy nanocomposites was higher than that of untreated MMT/epoxy nanocomposites, irrespective of weight ratio.

The Effects of Tensile Properties on Plane Strain Stretchability of Automotive Steel Sheets (인장특성이 자동차용강판의 평면변형장출성에 미치는 영향)

  • 김영석;박기철;김선원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.17 no.11
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    • pp.2676-2683
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    • 1993
  • Plane strain punch stretching test(PSST) was performed for various automotive steel sheets. To clarify the effect of tensile properties on plane strain stretchability, the limiting punch height(LPH) values were obtained in plane strain punch stretching test and related to the tensile properties of the materials. The results show that the total elongation El and work hardening exponent n compared to other parameters obtained from tensile test well correlate with the LPH value. In comparision with the Erichsen test and LDH test the PSST can be statistically used as an alternative in assessing the stamping formability of automotive steel sheets with the advantages of good reproducibility and easy testing method.

Effect of Deformation Temperature and Manganese Contents on the Tensile Properties of Fe-Cr-Ni-Mn Duplex Stainless Steel (Fe-Cr-Ni-Mn 2 상 스테인레스강의 인장성질에 미치는 변형온도 및 Mn 함량변화의 영향)

  • Kang, C.Y.;Sung, J.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.4 no.4
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    • pp.44-52
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    • 1991
  • The effect of deformation temperature and manganes contents on the tensile properties of duplex stainless steels with the structure of both ferrite and austenite were investigate. For this investigation, Fe-19% Cr-5% Ni-4~8% Mn alloys were prepared. The result obtained from this experiment are summerized as follows. With decreasing deformation temperature, tensile strengths of duplex stainless steel increased. Elongation showd to be increased and then decreased after representing the highest value at specific temperature. Tensile properties of duplex stainless steel were controlled by TRIP behavior in this experimental range of austenite contents. Tensile strengths decreased with increasing Mn contents. With increasing Mn contents, elongation decreased in the high temperature region, but increased in the low temperature region. The peak temperature representing the maximum elongation were changed to low temperature and the width of peak appeared to be broaden with increasing Mn contents.

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Effect of Deformation Temperature, Strain Rate and Grain Size on the Tensile Properties of 304L Stainless Steel (304L stainless Steel의 인장성질에 대한 변형온도, 변형속도 및 결정입도의 영향)

  • Kang, C.Y.;Sung, J.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.3 no.2
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    • pp.20-31
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    • 1990
  • This investigation has been carried out to make clear the effect of deformation temperature, strain rate and grain size on the tensile properties of 304L stainless steel. Tensile properties of the metastable austenitic 304L steel remarkably influenced by deformation temperature. Tensile strength increased with decreasing deformation temperature and the elongation showed maximum value near $40^{\circ}C$. In order to obtain the high elongation, a large amount of deformation is available in austenite before martensitic transformation and the martensite has to be induced gradually. Tensile strength and elongation increased with decreasing grain size. The temperature representing the maximum elongation shifted to low temperature and the peak width of elongation became broaden with decreasing austenite grain size. The volume fraction of strain induced martensite decreased with decreasing austenite grain size. As the strain rate increase, the temperature representing the maximum elongation value shifted to high temperature and volume fraction of strain induced martensite decreased.

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Effect of Aging Treatment on the Microstructure and Low Temperature Tensile Properties in 5083 Aluminum Alloy Weldments (5083 Al합금 용접재의 조직 및 저온 인장성질메 미치는 시효처리의 영향)

  • Lee, T.C.;Lee, H.W.;Joo, D.W.;Lee, J.H.;Sung, J.H.
    • Journal of the Korean Society for Heat Treatment
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    • v.13 no.1
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    • pp.1-9
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    • 2000
  • The microstructural characteristics and low temperature tensile properties between $25^{\circ}C$ and $-196^{\circ}C$ for as-welded and age hardened specimen by using Al 5083-H321 for base metal, 5083-5356 and 5083-4043 weldments have been investigated. The hardness of 5083-5356 weldment decreases with aging treatment, whereas the weld region of 5083-4043 weldment shows remarkable increase in hardness after aging due to the precipitation of fine Si particle at the grain boundaries and interiors. Low temperature tensile properties of 5083 AI base metal, 5083-5356 and 5083-4043 weldments appear to be the increment of tensile strengths and elongations at the room temperature and $-196^{\circ}C$, while the decrement of tensile properties around $-50^{\circ}C$ is shown. Through the observation of fine serration to fracture in the stress-strain curve and tensile fractography, the increment of localized deformation leading to promote the neck initiation and the increment of the dimple size cause to decrease in tensile strengths and elongations around $-50^{\circ}C$. For the tensile specimen of the 5083 base metal, 5083-5356 and 5083-4043 weldments, the reason to increase in elongation after solution and aging treatment is the diminishment of fine pit, the resolution of Mg into the matrix and the spheridization of the eutectic Si.

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Mechanical properties of TiO2/epoxy resin nanocomposites

  • Ahn, Seok-Hwan;Nam, Ki-Woo;Moon, Chang-Kwon
    • Journal of Power System Engineering
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    • v.17 no.5
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    • pp.69-77
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    • 2013
  • The purpose of this study is to improve the properties of epoxy resin using the big-sized titanium oxide nanoparticles. The effects of particle weight fraction and shape of sample on the thermal and mechanical properties in titanium oxide reinforced epoxy resin has been investigated. In addition, the effect of particle dispersion situation on the mechanical properties of nanocomposites has been studied. As a result, the Tg was almost same regardless of the content of nanoparticles. Storage modulus increased up to the content of 3wt% particles and then decreased. Tensile strength and modulus of film-shaped sample with 1wt% was higher than the one of pure epoxy, while other composites were not. The tensile strength of dogbone-shaped sample with 1wt% was only higher than the one of pure epoxy, while other composites were lower than the one of pure epoxy. Tensile modulus of dogbone-shaped samples increased with the content of particles.