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A FEM simulation of AFM indentation of soft biomaterials was made in ANSYS based on five-parameter hyperelastic Mooney Rivlin model. The simulation result shows that: The finite thickness film behavior is stiffer than the thicker film at larger indentations.
Delamination is one of the main problems in electronic packaging due to the relatively weak adhesion strength of interfaces. Delamination failure includes two processes: crack initiation and crack propagation. Various experimental setups and theories have been built to study these processes. Among these studies the cohesive zone method being implemented in various finite element packages is becoming...
Bone marrow was assumed to be negligible on the aspect of bone mechanical behavior, where bone mass and bone mineral density were most studied. As a result, if the bone marrow, especially the marrow fat, plays a role in the bone mechanical properties is unknown yet. Marrow fat content was found increased in osteoporotic bone. However, the relationship between such change of bone marrow and bone strength...
The medical modeling based on CT imaging had been widely used in the current finite element analysis (FEA) of biomechanical study. To find out a new rapid and efficient method of model construction became the key point of further study. In this article, we proposed a new modeling method which introduced the innovative employment of the SIEMENS SYNGO 3D software before further processing of MIMICS...
By using CT photographs,this paper will develop the finite element model of C0-C1-C2 with detailed anatomical structure.Through the research on finite element analytical model, material properties,load and boundary conditions,the model will be validated for four kinds of physiological movements - flexion, extension,lateral bending,and axial rotation respectively.This paper will present a calculating...
This study reviewed some available FE human neck models developed by some researchers used for human neck injury biomechanics, neck responses and injury predicting. The different ways of anatomical modeling, the material properties and model validation approaches in the models are summarized and compared for better understanding the FE human neck modeling. An advanced FE human neck model developed...
The increase of injection pressure leads to raise the contact stress of tappet roller body and emerge more serious abrasion problem. The study analyzes the movement regulations of cam roller body. The finite element calculations of contact stress on cam-follower with follower rotation are carried out with the FEM software. This study finally gets the distribution regulation of cam-roller and the influences...
A simplified model, which is composed of one tower and two spans of conductors, is given for overhead transmission line system. With tower regarded as cantilever beam and conductor as string, analytical calculation method of wind-induced vibration response of the mechanics system are studied based on the random vibration theory. A factor called dynamic load factor is introduced to the tower. Vibration...
Heat transfer in biological tissues based on the theory of porous media has recently attracted attention because porous media play an important role in many biomedical applications. In this study, a porous model of human forearm was proposed, which took the blood-tissue convection into consideration. Finite element method was used to analyze the heat transfer equation. In addition, the influences...
In the field of cranio-maxillofacial surgery, there is a huge demand from surgeons to be able to automatically predict the post-operative face appearance in terms of a pre-specified bone-remodeling plan. Collision detection is a promising means to achieve this simulation. In this paper, therefore, an efficient collision detection method based on a new 3D signed distance field algorithm is proposed...
This paper presents an improved biomechanical model for the prediction of the soft tissues in the plastic surgical simulator. The new model is built on nonlinear finite mixed-element method (NFM-EM) in which the internal soft tissues (muscles and fat) are discretized into tetrahedral solid elements and the skin tissues into triangular shell elements, which distinguishes between the internal soft tissues...
Accurate physically based biomechanical modelling of tissue deformation is important to surgical simulation and image guided intervention. Achieving real-time performance whilst maintaining relatively accurate simulation result has been a challenging problem to resolve. The purpose of this paper is to describe a novel yet practical image constrained finite element modelling framework for real-time...
Dynamics model on abrasive particles and workpieces during the centrifugal barrel surface finishing process was built by Discrete Element Method (DEM). The motion status of abrasive particles and workpieces was visually simulated and some important process parameters were numerically studied. The influence of planetary transmission ratio on finishing efficiency was analyzed, and finishing efficiency...
A simplified model, which is composed of one tower and two spans of conductors, is given for overhead transmission line system. With tower regarded as cantilever beam and conductor as string, analytical calculation method of wind-induced vibration response of the mechanics system are studied based on the random vibration theory. A factor called dynamic load factor is introduced to the tower. Vibration...
The global warming is word actuality and puzzle. The prediction on the changes of southern limit of permafrost in Northeastern China was achieved by combining of equivalent-latitude and finite element models. The mean annual soil surface temperature (MASST) has a close linear correlation with the MAAT, if the air temperature increment assumed to be 0.048degC/a for the studied period during the next...
Electrical impedance tomography (EIT) is a noninvasive technique to estimate the conductivity distribution inside the object. In EIT, driving currents are injected through the object and voltages are measured at the electrodes on the surface. Algorithms to estimate the conductivity distribution from the measured voltages are called reconstruction algorithms. Image reconstruction is a nonlinear inverse...
Electrical impedance tomography (EIT) is a newly developed technique by which impedance measurements from the surface of an object are reconstructed into impedance image. But in the initial stage, the EIT problem is regarded as the two-dimensional EIT problem, which ignores too much important information and makes it can't give the exact spatial information of the place where the impedance has changed...
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