Papers by Keyword: Numerical Testing

Abstract: Based on extended finite element coupled with field variable method, fatigue damage numerical test of three point-bending beam with initial notch has been made to predict crack propagation path, numerical results showed : under the fatigue loading with 200Hz, and amplitude is 20KN, length of crack expanding was the biggest and crack grew as some angles with the initial crack during the first loading, crack propagated parallel to the initial angle during the other loading cycle. These results can fit the experiment very well. Using Fortran, A new user subroutine named USDFILD (User subroutine to redefine field variables at a material point) was also provided on the platform of ABAQUS, which can modal the change of physic material with time. This user subroutine can also import fatigue characterize of material into the model.

Abstract: Rock and soil aggregate (RSA) is a special geo-material and composed of hard matrix like gravel, cobble, pebble and soft matrix of soil. Discontinuity and heterogeneity are the main characteristics of RSA and its mechanical response is mainly controlled by its complex internal structure. The rock fragments play very important role in the mechanical performances under the condition of uniaxial compression and the rock content (the volume percent of rock fragments in RSA) of RSA is the focus of this study. RSA models with different rock content based on the structural characteristics were built for the numerical uniaxial test. The strength of RSA decreases instead with the increment of rock contents, stress-strain curves attained in the test reflect five different phases according to the deformation and failure process of samples.

Abstract: Because actual soil body, especially pollution soil has the complex geotechnical conditions and non-uniformity character, the conventional methods are limited to solve the foundation bearing capacity pressure. The paper proposed an analysis flow of pollution soil foundation bearing capacity evolution, and proposed the numerical test method for pollution soil body combining Fast Lagrange numerical method and limit analysis theory, which utilizes the power ability of numerical simulation and has good flexibility to complex foundation. Using the method to execute a simulation for the pollution soil body of certain sulfuric acid factory, obtained the visual destroy process and got the foundation bearing capacity accurately. And the foundation destroy mechanism is also revealed. The numerical results stated that the proposed method is a good mean to analyze foundation bearing capacity for pollution soil body which has good application prospect.