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Composites with carbon nanotubes and graphene: An outlook
Kinloch, Ian A.,Suhr, Jonghwan,Lou, Jun,Young, Robert J.,Ajayan, Pulickel M. American Association for the Advancement of Scienc 2018 Science Vol.362 No.6414
<P>Composite materials with carbon nanotube and graphene additives have long been considered as exciting prospects among nanotechnology applications. However, after nearly two decades of work in the area, questions remain about the practical impact of nanotube and graphene composites. This uncertainty stems from factors that include poor load transfer, interfacial engineering, dispersion, and viscosity-related issues that lead to processing challenges in such nanocomposites. Moreover, there has been little effort to identify selection rules for the use of nanotubes or graphene in composite matrices for specific applications. This review is a critical look at the status of composites for developing high-strength, low-density, high-conductivity materials with nanotubes or graphene. An outlook of the different approaches that can lead to practically useful nanotube and graphene composites is presented, pointing out the challenges and opportunities that exist in the field.</P>
HIGH-STRAIN-RATE FRACTURE OF ADHESIVELY BONDED COMPOSITE JOINTS IN DCB AND TDCB SPECIMENS
조재웅,A. KINLOCH,B. BLACKMAN,F. S. RODRIGUEZ SANCHEZ,한문식 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.7
Double-cantilever beam (DCB) and tapered double-cantilever beam (TDCB) specimens are the test configurations most commonly used to measure the fracture toughness of composites and adhesive joints. Strain rates of 1 to 18.47 m/s were applied to the test specimens via high-speed hydraulic test equipment. Because the fracture occurs through the adhesively bonded joints and the cracks grow rapidly, the crack length and beam displacement were recorded by a high-speed camera. An energy range from 0 to 10 J was often observed in the high-strain-rate fracture experiments for nonlinear plastic behavior of the dynamically loaded adhesively bonded DCB and TDCB specimens. The range of energy release rates (fracture energy) for TDCB specimen was 2 to 3 times higher than that of a DCB specimen for all high strain rates. The fracture energy of automotive adhesive joints can be estimated using the experimental results in this study for the fracture toughness (GIC) under high rates of loading. The crack grows as the applied fracture energy exceeds the value of the critical energy release rate (GIC) at the crack tip. The energy release rate was calculated using the fracture mechanics formula. The key fracture mechanics parameter, the fracture energy GIC, was ascertained as a function of the test rate and can be used to assess and model the overall joint performance.
Fracture Behaviour of Adhesively-bonded Composite Materials under Impact Loading
Cho, Jae-Ung,Kinloch, Anthony,Blackman, Bamber,Rodriguez, Sebastian,Cho, Chong-Du,Lee, Sang-Kyo 한국정밀공학회 2010 International Journal of Precision Engineering and Vol.11 No.1
In this paper, a polymeric unidirectional carbon-fibre epoxy-resin composite is both experimentally and numerically investigated to study the nonlinear material behavior of impacted DCB (Double Cantilever Beam) specimens. For the impact analysis, the load and the displacement applied from pin onto end block as well as the crack energy release rate are measured and compared with the finite element analysis results. The energy release rate is a critical measure of the resistance to crack propagation, which can be estimated by the force and displacement at the crack tip. It is found that the energy release rate measured from impact tests on the specimens is well predicted by the suggested finite element model in this study.
A study of the impact properties of adhesively-bonded aluminum alloy based on impact velocity
Teng Gao,Anthony J. Kinloch,Bamber R. K. Blackman,F. S. RODRIGUEZ SANCHEZ,이상교,조종두,방혜진,전성식,조재웅 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.2
In this study, an experiment and a simulation were carried out on colliding an adhesively-bonded tapered double cantilever beam(TDCB) at the impact velocities of 5 m/s, 7.5 m/s and 12.5 m/s. The analysis method of the corrected beam theory (CBT) was used toobtain the rate of energy release in the bonded area according to the crack progression, and a simulation was performed to determine themaximum strain energy during the impact analysis as a means to examine the mechanical properties of aluminium alloy. The experimentaldata were found to be higher than the simulation data. This is deemed to explicable by the fact that the adhesive strength was maintainedeven after the specimen separated in the experiment. Crack progression occurred, irrespective of the impact velocity, and highstrain energy occurred at the end of the bonded region, thereby causing the strain energy to increase in the final stages. Also, the maximumload applied on the pin and the maximum strain energy in the bonded area were shown increase at higher impact velocities. Theresults of the experiment and simulation performed in this study are expected to serve as important data in developing a safety design forcomposite materials that can help prevent the progression of cracks caused by impact.
모드 I 하중조건하에 있는 다방향 적층 복합재료의 층간파괴거동
최낙삼,Choi, Nak-Sam,Kinloch, A.J. 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.3
The delamination fracture of multidirectional carbon-fiber/epoxy laminates under the Mode I condition has been studied using the modified beam analysis for a fracture mechanics approach. It was found that the variation of fracture energy $G_IC$ with increasing length of the propagating crack exhibited a minimum for the pure interlaminar fracture and a maximum for the intraply fracture,i.e. a rising "R-curve", which was strongly affected by the degree of fiber bridging and crack-tip splitting arising in the global delamination. The maximum $G_IC$ value was significantly dependent on such types of delamination as no crack jumping, crack jumping into the adjacent ply and edge-delamination. It was shown also that the value of "effective flexural modulus" estimated from the modified beam analysis increased much with the development of fiber bridging behind the crack tip.ehind the crack tip.