In this work,a bidirectional fluid-structure coupling finite element analysis model of the abdominal aorta was established,with the various vascular elastic modulus as the main parameters for atherosclerosis,taking in...In this work,a bidirectional fluid-structure coupling finite element analysis model of the abdominal aorta was established,with the various vascular elastic modulus as the main parameters for atherosclerosis,taking into consideration blood's dynamic viscosity and compressibility.Pressure and velocity pulse-wave propagation were investigated through the application of a full-coupling analysis algorithm.The effect of atherosclerosis degree on the propagation characteristics of pulse waves in the bifurcated abdominal aorta was quantitatively analyzed.Arterial bifurcation can cause substantial attenuation on the peak of pressure pulse waveform and an increase in wave velocity during the cardiac cycle.The elastic modulus and bifurcation properties of the arterial wall directly affected the peak value and wave propagation velocity of the pressure pulse wave.The preliminary results of this work will be crucial in guiding the evolution of the pressure pulse wave and the initial diagnosis of atherosclerotic disease through the waveform.展开更多
A numerical method is proposed for the elasto-plasticity and pore-pressure coupled analysis on the pull- out behaviors of a plate anchor. The bounding-surface plasticity （BSP） model combined with Blot＇s consol- ida...A numerical method is proposed for the elasto-plasticity and pore-pressure coupled analysis on the pull- out behaviors of a plate anchor. The bounding-surface plasticity （BSP） model combined with Blot＇s consol- idation theory is employed to simulate the cyclic loading induced elasto-plastic deformation of the soil skeleton and the accompanying generation/dissipation of the excess pore water pressure. The suction force generated around the anchor due to the cyclic variation of the pore water pressure has much effect on the pullout capacity of the plate anchor. The calculated pullout capacity with the proposed method （i.e., the coupled analysis） gets lower than that with the conventional total stress analysis for the case of long-term sustained loading, but slightly higher for the case of short-term monotonic loading. The cyclic loading induced accumulation of pore water pressure may result in an obvious decrease of the stiffness of the soil-Plate anchor svstem.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.11872218)Zhejiang Provincial Natural Science Foundation Key Projects(Grant No.LZ23A020001)+2 种基金the National Natural Science Foundation of China Regional Innovation Key Project(Grant No.U21A20502)Zhejiang Province Traditional Chinese Medicine Science and Technology Foundation(Grant No.2022ZB317)the first batch of Medical and Health Brand Discipline Foundation in Ningbo(Grant No.PPXK2018-07)。
文摘In this work,a bidirectional fluid-structure coupling finite element analysis model of the abdominal aorta was established,with the various vascular elastic modulus as the main parameters for atherosclerosis,taking into consideration blood's dynamic viscosity and compressibility.Pressure and velocity pulse-wave propagation were investigated through the application of a full-coupling analysis algorithm.The effect of atherosclerosis degree on the propagation characteristics of pulse waves in the bifurcated abdominal aorta was quantitatively analyzed.Arterial bifurcation can cause substantial attenuation on the peak of pressure pulse waveform and an increase in wave velocity during the cardiac cycle.The elastic modulus and bifurcation properties of the arterial wall directly affected the peak value and wave propagation velocity of the pressure pulse wave.The preliminary results of this work will be crucial in guiding the evolution of the pressure pulse wave and the initial diagnosis of atherosclerotic disease through the waveform.
基金supported by the National Natural Science Foundation of China(51309213)the 973 program of China (2014CB046200)
文摘A numerical method is proposed for the elasto-plasticity and pore-pressure coupled analysis on the pull- out behaviors of a plate anchor. The bounding-surface plasticity （BSP） model combined with Blot＇s consol- idation theory is employed to simulate the cyclic loading induced elasto-plastic deformation of the soil skeleton and the accompanying generation/dissipation of the excess pore water pressure. The suction force generated around the anchor due to the cyclic variation of the pore water pressure has much effect on the pullout capacity of the plate anchor. The calculated pullout capacity with the proposed method （i.e., the coupled analysis） gets lower than that with the conventional total stress analysis for the case of long-term sustained loading, but slightly higher for the case of short-term monotonic loading. The cyclic loading induced accumulation of pore water pressure may result in an obvious decrease of the stiffness of the soil-Plate anchor svstem.
