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Effects of thermoforming on the physical and mechanical properties of thermoplastic materials for transparent orthodontic aligners
Jeong-Hyun Ryu, Jae-Sung Kwon, Heng Bo Jiang, Jung-Yul Cha, Kwang-Mahn Kim 대한치과교정학회 The Korean Journal of Orthodontics 10 Pages
대한치과교정학회 The Korean Journal of Orthodontics 2018, 제 48권 제 5호 5 316-325 (10 pages)
gap by systematically evaluating the physical and mechanical properties of TOAs in consideration of the clinical environment in which they would be applied. A multiscale evaluation was performed after the thermo- forming of various thermoplastic materials with differ- ent thicknesses in order to test the null hypothesis that the mechanical and physical properties of all materials would remain... Objective: The aim of this systematic multiscale analysis was to evaluate the effects of thermoforming on the physical and mechanical properties of thermoplastic materials used to fabricate transparent orthodontic aligners (TOAs). Methods: Specimens were fabricated using four types of thermoplastic materials with different thicknesses under a thermal vacuum. Transparency, water absorption and solubility, surface hardness, and the results of three-point bending and tensile tests were evaluated... -
Mechanical Stretch-Induced Protection against Myocardial Ischemia- Reperfusion Injury Involves AMP-Activated Protein Kinase
JiaHao, Hun-SikKim, WoongChoi, TaeSunHa, Hee-YulAhn, Chan-HyungKim 대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 9 Pages
대한생리학회-대한약리학회 The Korean Journal of Physiology & Pharmacology 2010, Vol.14 No.1 1 1-9 (9 pages)
in the ACS rats (Fig. 4A) indicates that volume over- load adequately increased diastolic wall stress and stretch- ed left ventricular end diastolic length. On the other hand, there is a possibility that brief volume overload might cause changes in myocardial blood flow and induce transient ischemic stress in the heart. In the present study, myocardial lactate content at baseline and after 30... many stimuli including mechanical stretch. Therefore, this study investigated if the activation of AMPK is involved in stretch-induced cardioprotection (SIC). Intraventricular balloon and aorto-caval shunt (ACS) were used to stretch rat hearts ex vivo and in vivo, respectively. Stretch preconditioning reduced myocardial infarct induced by ischemia-reperfusion (I/R) and improved post-ischemic functional recovery. Phosphorylation of AMPK and its downstream substrate, acetyl-CoA carboxylase (ACC)... -
Fabrication of carbon fiber SMC composites with vinyl ester resin and effect of carbon fiber content on mechanical properties
Haksung Lee, Mongyoung Huh, Jaeyoung Yoon, Dasom Lee, Seonyul Kim, Shinjae Kang 한국탄소학회 Carbon Letters 4 Pages
한국탄소학회 Carbon Letters 2017, Vol.22 11 101-104 (4 pages)
the fracture surface after the tensile test. Compared with a conventional SMC having a Fig. 3. Mechanical test results of the carbon sheet molding compound for (a) tensile test and (b) exure test. Fig. 4. Scanning electron microscope images of carbon fiber sheet molding compound with ber contents of (a) 40 wt%, (b) 45 wt%, (c) 50 wt%, and (d) 55 wt%. ..PAGE:4 Carbon Letters Vol. 22, 101-104... Fiber reinforced composites are being used in the automotive industry and other manufacturing fields. Their properties, including high specific stiffness, strength and weight reduction make fiber composite materials an attractive replacement for metal components. The development of composites like carbon fiber reinforced plastic and related production technologies have contributed to the increasing application of fiber composite materials. Many new components have recently been adapted,... -
The impact fracture behaviors of CFRP/EVA composites by drop-weight impact test
Sun-Ho Go, Hong-Gun Kim, Hee-Jae Shin, Min-Sang Lee, Hyun-Gyung Yoon, Lee-Ku Kwac 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2017, Vol.21 4 23-32 (10 pages)
Carbon Lett, 16, 241 (2015). https://doi. org/10.5714/CL.2015.16.4.241. and at the same time, the mechanical/thermal properties were analyzed with thermo-graphic images. First, the results of the load-displacement curve show two tendencies. Types 1 and 2, for which CFRP is the major lami- nation source, show decreasing temperature and displace- ment after reaching their peaks. However, Types 3... A drop weight impact test was conducted in this study to analyze the mechanical and thermal properties caused by the changes in the ratio of carbon fiber reinforced plastic (CFRP) to ethylene vinyl acetate (EVA) laminations. The ratios of CFRP to EVA were changed from 10:0 (pure CFRP) to 9:1, 8:2, 6:4, and 5:5 by manufacturing five different types of samples, and at the same time, the mechanical/thermal properties were analyzed with thermo-graphic images. As the ratio of the CFRP lamination was... -
Mechanical interfacial adhesion of carbon fibers-reinforced polarized-polypropylene matrix composites: effects of silane coupling agents
Woong-Ki Choi, Hyun-Il Kim, Shin-Jae Kang, Young Sil Lee, Jong Hun Han, Byung-Joo Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2016, Vol.17 No.1 12 79-84 (6 pages)
1976-4251 eISSN: 2233-4998 REVIEWS VOL. 17 NO. 1 January 31 2016 ..PAGE:2 Carbon Letters Vol. 17, No. 1, 79-84 (2016) DOI: http://dx.doi.org/10.5714/CL.2016.17.1.079 80 trix. The three-point bending test was performed with an Instron Model Lloyd LR-5K mechanical tester according to the ASTM D-2344. The span-to-depth ratio and cross-head speed used were 4:1 and 2.0 mm/min, respectively. The ILS... -
Influence of laminated orientation on the mechanical and thermal characteristics of carbon-fiber reinforced plastics
Hee-Jae Shin, Lee-Ku Kwac, Min-Sang Lee, Hong-Gun Kim 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.4 3 241-246 (6 pages)
lami- nated angle. ..PAGE:5 Mechanical and thermal characteristics of CFRP 245 http://carbonlett.org 4. Conclusions In this study, correlations between the mechanical and ther- mal characteristics of CFRPs were determined using drop- weight impact tests at various fber-laminated angles. The fol- lowing results were obtained. 1) In the drop-weight impact test, the 0°/15° specimen had the biggest... Rapid industrial development in recent times has increased the demand for light-weight materials with high strength and structural integrity. In this context, carbon fiber-reinforced plastic (CFRP) composite materials are being extensively used. However, laminated CFRPs develop faults during impact because CFRPs are composed of mixed carbon fiber and epoxy. Moreover, their fracturing behavior is very complicated and difficult to interpret. In this paper, the effect of the direction of lamination... -
Stabilization of pitch-based carbon fibers accompanying electron beam irradiation and their mechanical properties
Mi-Seon Park, Yoonyoung Ko, Min-Jung Jung, Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2015, Vol.16 No.2 8 121-126 (6 pages)
of 10°-80°. The morphologies of the samples were investigated using a feld emission scanning electron microscope (FE-SEM; Hitachi, S-5500, Korea Basic Science Institute, Jeonju Center). 2.4. Mechanical properties of the CFs The tensile strengths of single fbers after carbonization were measured using a single fber tester (FAVIMAT+, Textechno, Germany) equipped with a load cell of 210 cN.... Carbon fibers are prepared by stabilizing pitch fibers accompanying electron beam (E-beam) irradiation. The carbon fibers pretreated by E-beam irradiation achieve a higher stabilization index than the carbon fibers that are only heat-stabilized. In addition, the carbon fibers subjected to E-beam irradiation in the stabilization step exhibit a comparable tensile strength to that of general purpose carbon fibers. The carbon fibers pretreated with an absorbed dose of 3000 kGy have a tensile... -
Mechanical and thermal properties of MWCNT-reinforced epoxy nanocomposites by vacuum assisted resin transfer molding
Si-Eun Lee, Seho Cho, Young-Seak Lee 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2014, Vol.15 No.1 4 32-37 (6 pages)
the mechanical and thermal properties of the MWCNT/epoxy nanocomposites is attributed to improved dispersibility and strong interfacial interaction between the MWCNTs and the epoxy in the composites prepared by VARTM. Key words: multi-walled carbon nanotubes, mechanical properties, fracture, epoxy, vacuum assisted resin transfer molding 1. Introduction Demand for advanced materials with better... Multi-walled carbon nanotube (MWCNT)/epoxy composites are prepared by a vacuum assisted resin transfer molding (VARTM) method. The mechanical properties, fracture surface morphologies, and thermal stabilities of these nanocomposites are evaluated for epoxy resins with various amounts of MWCNTs. Composites consisting of different amounts of MWCNTs displayed an increase of the work of adhesion between the MWCNTs and the matrix, which improved both the tensile and impact strengths of the... -
Modifications of mechanical, thermal, and electrical characteristics of epoxy through dispersion of multi-walled carbon nanotubes in supercritical carbon dioxide
MGH ZAIDI, Sanjeev Joshi, Manoj Kumar, Deepak Sharma, Ashwin Kumar, Sarfaraz Alam, Prakash Sah 한국탄소학회 Carbon Letters 10 Pages
한국탄소학회 Carbon Letters 2013, Vol.14 No.4 4 218-227 (10 pages)
of the epoxide ring. 3.1. Mechanical properties Fig. 5 represents the effect of MWCNT concentration on control over wear loss (mg/min) of CECs at selected hydraulic end loads (bar) of 2.0 and 4.0 at a constant disc speed of 320 rpm. With increasing concentration of MWCNTs remarkable control over WL of the CECs was observed, and subsequently increased with hydraulic end load (Fig. 5a) and time... -
Effect of additional heat-treatment temperature on chemical, microstructural, mechanical, and electrical properties of commercial PAN-based carbon fibers
DonghwanCho, SungBongYoon, ChaeWookCho, JongKyooPark 한국탄소학회 Carbon Letters 6 Pages
한국탄소학회 Carbon Letters 2011, Vol.12 No.4 5 223-228 (6 pages)
property, electrical resistivity, microstructure 1. Introduction It is well known that carbon fbers have excellent multi-properties of thermal, mechanical, thermo-mechanical, thermo-physical, electrical, chemical and frictional properties, particu- larly in elevated temperatures [1,2]. Therefore, rayon-based, acrylonitrile-based, and pitch- based carbon fbers have been extensively used in a...