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Three dimensional efficient meshfree simulation of large deformation failure evolution in soil medium

Science China(Technological Sciences) 2011年第3期54卷 573-580页

作者： WANG DongDong LI ZhuoYa LI Ling WU YouCai Department of Civil Engineering Xiamen University Xiamen 361005 China Karagozian & Case 2550 N Hollywood Way Suite 500 Burbank CA 91505 USA

An efficient Galerkin meshfree formulation for three dimensional simulation of large deformation failure evolution in soils is presented. This formulation utilizes the stabilized conforming nodal integration, where for the purpose of stability and efficiency a Lagrangian smoothing strain at nodal point is constructed and thereafter the internal energy is evaluated nodally. This formulation ensures the linear exactness, efficiency and spatial stability in a unified manner and it makes the conventional Galerkin meshfree method affordable for three dimensional simulation. The three dimensional implementation of stabilized conforming nodal integration is discussed in details. To model the failure evolution in soil medium a coupled elasto-plastic damage model is used and an objective stress integration algorithm in combination of elasto-damage predictor and plastic corrector method is employed for stress update. Two typical numerical examples are shown to demonstrate the effectiveness of the present method for modeling large deformation soil failure.

关键词： meshfree method three dimensions stabilized conforming nodal integration failure evolution large deformation

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Experimental study on failure evolution mechanism of clastic rock considering cementation and intermediate principal stress

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第7期15卷 1636-1650页

作者： Feiyan Wang Xia-Ting Feng Yangyi Zhou Xiaojun Yu Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil EngineeringNortheastern UniversityShenyang110819China Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China

The study of clastic rock failure evolution under true triaxial stress is an important research topic;however,it is rarely studied systematically due to the limitation of monitoring *** this study,true triaxial compression tests were conducted on clastic rock specimens to investigate the effect of cementation and intermediate principal stress(s2)on the failure *** complete stressestrain curves were obtained,while the acoustic emission(AE)was monitored to indirectly evaluate the evo-lution of tensile and shear cracks,and crack evolution under true triaxial compression was imaged in real time by a high-speed *** results showed that the deformation and failure characteristics of clastic rock were closely related to the cementation type and intermediate principal *** the basis of the distribution characteristics of the ratio of rise time to amplitude(RA)and the average frequency(AF)of AE signals,tensile cracks of the contact cementation specimen propagated ***,the enhancement of specimen cementation promoted the evolution of shear cracks,and the increase inσ_(2)promoted the evolution of tensile ***,the mesoscale cracking mechanism of clastic rock caused by cementation andσ_(2)under true triaxial compression was *** failure patterns of clastic rock under true triaxial compression were divided into three modes:structure-induced,structure-stress-induced and stress-induced *** study confirms the feasibility of high-speed camera technology in true triaxial testing,and has important implications for elucidating the disaster mechanism of deep tunnels in weak rocks.

关键词： True triaxial compression Cementation failure evolution Acoustic emission(AE) High-speed camera

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Thermomechanical response of aluminum alloys under the combined action of tensile loading and laser irradiations

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Chinese Physics B 2018年第3期27卷 469-480页

作者： Mohsan Jelani Zewen Li Zhonghua Shen Maryam Sardar School of Science Nanjing University of Science and Technology Nanjing 210094 China Advanced Launching Co-Innovation Centre Nanjing University of Science and Technology Nanjing 210094 China

This study reports the investigation of the thermomechanical behavior of aluminum alloys （AI-1060, A1-6061, and A1-7075） under the combined action of tensile loading and laser irradiations. The continuous wave ytterbium fiber laser （wavelength 1080 nm） was employed as the irradiation source, while tensile loading was provided by the tensile testing machine. The effects of various pre-loading and laser power densities on the failure time, temperature distribution, and the deformation behavior of aluminum alloys are analyzed. The experimental results represent the significant reduction in failure time for higher laser power densities and for high preloading values, which implies that preloading may contribute a significant role in the failure of the material at elevated temperature. Fracture on a microscopic scale was predominantly ductile comprising micro-void nucleation, growth, and coalescence. The AI-1060 specimens behaved plastically to some extent, while A1-6061 and A1-7075 specimens experienced catastrophic failure. The reason and characterization of ma- terial failure by tensile and laser loading are explored in detail. A comparative behavior of under-tested materials is also investigated. This work suggests that studies considering only combined loading are not enough to fully understand the mechanical behavior of under-tested materials. For complete characterization, one should consider the effect of heating as well as loading rate and the corresponding involved processes with the help of thermomechanical coupling and the thermal elastic-plastic theory.

关键词： aluminum alloys fiber laser tensile loading thermomechanical effects failure evolution

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