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탄소성 파괴역학에서 균열 성장 예측을 위한 확장유한요소법
( Chau-dinh Thanh ),김지환 ( Kim Ji Hwan ),지광습 ( Zi Goangseup ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
In this paper the extended finite element method is applied to numerically simulate crack propagation in aluminum sheets under monotonic increasement of displacement control. J2 plasticity of material model is included. Under elasto-plastic condition, CTOA criterion is employed for modeling stable crack growth during the fracture process. Results show good agreement with experimental measurement.
Extended Finite Element Method for Predicting Crack Propagation in Elasto-Plastic Fracture Mechanics
Chau-Dinh Thanh,김지환(Kim Ji Hwan),지광습(Zi, Goangseup) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
In this paper the extended finite element method is applied to numerically simulate crack propagation in aluminum sheets under monotonic increasement of displacement control. J2 plasticity of material model is included. Under elasto-plastic condition, CTOA criterion is employed for modeling stable crack growth during the fracture process. Results show good agreement with experimental measurement.
Kinematic Modeling of Spherical Rolling Robots with a Three-Omnidirectional-Wheel Drive Mechanism
Pham Dinh Ba,Quoc Dong Hoang,Soon-Geul Lee,Thanh Hai Nguyen,Xuan Quang Duong,Boi Chau Tham 제어로봇시스템학회 2020 제어로봇시스템학회 국제학술대회 논문집 Vol.2020 No.10
The spherical rolling robot (SRR) is an underactuated system with nonholonomic constraints. The proposed drive mechanism for the mobile robot is comprised of three omnidirectional wheels to make the omnidirectional movement of the robot on the floor. The kinematic model of the SRR is derived via nonholonomic constraints. Numerical simulation is analyzed. Results indicate that the robot can track the desired trajectory and maintain its balance stably at the same time.
J-적분을 통한 아스팔트 포장체의 피로 균열 성장 분석
유성문 ( Yu Seongmun ),차우딘단 ( Chau Dinh Thanh ),지광습 ( Zi Goangseup ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This paper studies fatigue crack growth of asphalt using J-integral method. Asphalt pavements can be cracked under repeated vehicle loadings, which is called fatigue crack. So precise prediction on the fatigue crack growth in the asphalt pavement is necessary for efficient maintenance works. To analyze fatigue crack growth, energy based J-integral method is used in this paper. Using that method, the analysis simulates the fatigue test results appropriately.
Van-Truc Nguyen,Thanh-Binh Nguyen,Thi-Dieu-Hien Vo,Nguyen Duy Dat,Thi-Kim Quyen Vo,Xuan Cuong Nguyen,Viet-Cuong Dinh,Thi-Ngoc-Chau Le,Thi-Giang-Huong Duong,Manh-Ha Bui,Xuan-Thanh Bui 대한환경공학회 2023 Environmental Engineering Research Vol.29 No.3
This study explores the adsorption of doxycycline (DOX) from aqueous solutions onto biochar derived from banana peel, which was prepared using a potassium hydroxide activation method (KOH-BPB). The biochar properties were characterized based on morphology, surface area (SBET of 710.241 ㎡ g<SUP>−1</SUP>), functional groups, and surface charge (pHPZC = 7.7). Parameters, including initial pH, DOX concentration, and ionic strength, that influenced the DOX adsorption capacity of KOH-BPB were examined. Adsorption equilibrium of DOX on KOH-BPB was assessed through four isothermal models: the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich models. The obtained data were most compatible with the Langmuir model (R² = 0.9879). KOH-BPB has a maximum DOX absorption capacity of 121.95 mg g<SUP>-1</SUP> which exceeds that of many comparable absorbents. The maximum DOX removal was 96.7% at pH 6, a DOX concentration of 20 mg L<SUP>-1</SUP>, and a KOH-BPB dose of 1.0g L<SUP>-1</SUP>. These findings reveal that biochar from banana peel effectively removes antibiotic residues from water. This study provides a potential, low-cost, and environmentally friendly adsorbent.
J-적분을 통한 아스팔트 포장체의 피로 균열 성장 분석
유성문(Yu, Seongmun),차우딘단(Chau Dinh Thanh),지광습(Zi, Goangseup) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
This paper studies fatigue crack growth of asphalt using J-integral method. Asphalt pavements can be cracked under repeated vehicle loadings, which is called fatigue crack. So precise prediction on the fatigue crack growth in the asphalt pavement is necessary for efficient maintenance works. To analyze fatigue crack growth, energy based J-integral method is used in this paper. Using that method, the analysis simulates the fatigue test results appropriately.