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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.