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분역회전이 강유전체 세라믹 액추에이터 내의 균열발생에 미치는 영향
정경문(Kyoung Moon Jeong),김재연(Jae Yun Kim),범현규(Hyeon Gyu Beom) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.2
A crack emanating from an internal electrode or a conducting damage path in ferroelectric ceramic actuators is analyzed. The boundary of the domain switching zone near the edge of the internal electrode in a ceramic multilayer actuator is determined based on the nonlinear electric theory. The stress intensity factor induced by a ferroelectric domain switching under small scale conditions is numerically obtained for flaws of various sizes near the electrode edge. It is found that stress intensity factor near the crack tip depends on the material property of the electrical nonlinearity.
정경문(Kyoung Moon Jeong),김기운(Kee-Woon Kim),김태완(Tae Wan Kim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
The building process of tire is one of the most important steps in the tire manufacturing process. The present study covers work aimed at analyzing the building process of a passenger car tire using the finite element method. Specifically, the finite element code ABAQUS is used to analyze the inflation of a building bladder. Although the building bladder is a simple structure, the analysis is complicated due to the extremely large strains experienced by the bladder, as well as the necessity of simulating the contact of the bladder against the tire green case profile. The building bladders consist of mainly of shoulder bladder, turn-up bladder, and push-over bladder. The inflation of building bladders against a rigid tire green case profile was modeled. The solution involved a contact analysis using axisymmetric elements and an incompressible material model for the bladder compound. The analysis for building process is carried out for three steps, such as bead locking, the inflation of shoulder bladder, and the inflation of turn-up and push-over bladder.
정경문(Kyoung Moon Jeong),김기운(Kee-Woon Kim),이철민(Cheol Min Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The use of predictive finite element models in tire design and analysis has become widely popular in recent times. This is largely due to the introduction of high-performance computers in addition to the enhancement in the capabilities of existing proprietary finite element software, thus enabling the efficient use of such tire models in solving the challenging problems of pneumatic tire behavior as an alternative to experimental tests routinely carried out on tire prototypes. This study investigates tire burst behavior when the tire is inflated well beyond the manufacturer’s recommended maximum pressure. This will help to predict the extent to which a tire can be loaded before failing catastrophically, thus simulating one of the mandatory tire qualification tests. Consequently, an axisymmetric finite element tire model has been developed using the improved capabilities in ABAQUS FE code, which allows the modeling of the tire burst phenomenon, based on the ultimate strengths of the constituent reinforcement materials. A summary of the results obtained from this model for a TBR tire 12R22.5 is presented together with a study of the effect of some tire design parameters on the tire burst pressure.