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  • Open Access


    Aspects of Fretting Fatigue Finite Element Modelling

    Kyvia Pereira1, Libardo V. Vanegas-Useche2, Magd Abdel Wahab3, 4, *

    CMC-Computers, Materials & Continua, Vol.64, No.1, pp. 97-144, 2020, DOI:10.32604/cmc.2020.09862

    Abstract Fretting fatigue is a type of failure that may affect various mechanical components, such as bolted or dovetail joints, press-fitted shafts, couplings, and ropes. Due to its importance, many researchers have carried out experimental tests and analytical and numerical modelling, so that the phenomena that govern the failure process can be understood or appropriately modelled. Consequently, the performance of systems subjected to fretting fatigue can be predicted and improved. This paper discusses different aspects related to the finite element modelling of fretting fatigue. It presents common experimental configurations and the analytical solutions for cylindrical contact. More >

  • Open Access


    Analytical Study on the Rate of Sound Transmission Loss in Single Row Honeycomb Sandwich Panel Using a Numerical Method

    Rohollah Fallah Madvari1, Mohammad Reza Monazzam2, Mohsen Niknam Sharak3, Mohsen Mosa Farkhani4,*

    Sound & Vibration, Vol.54, No.2, pp. 127-137, 2020, DOI:10.32604/sv.2020.08158

    Abstract Honeycomb structures have recently, replaced with conventional homogeneous materials. Given the fact that sandwich panels containing a honeycomb core are able to adjust geometric parameters, including internal angles, they are suitable for acoustic control applications. The main objective of this study was to obtain a transmission loss curve in a specific honeycomb frequency range along with same overall dimensions and weight. In this study, a finite element model (FEM) in ABAQUS software was used to simulate honeycomb panels, evaluate resonant frequencies, and for acoustic analysis. This model was used to obtain acoustic pressure and then… More >

  • Open Access


    Hip Fracture Risk Assessment Based on Different Failure Criteria Using QCT-Based Finite Element Modeling

    Hossein Bisheh1, 2, Yunhua Luo1, 3, Timon Rabczuk4, *

    CMC-Computers, Materials & Continua, Vol.63, No.2, pp. 567-591, 2020, DOI:10.32604/cmc.2020.09393

    Abstract Precise evaluation of hip fracture risk leads to reduce hip fracture occurrence in individuals and assist to check the effect of a treatment. A subject-specific QCT-based finite element model is introduced to evaluate hip fracture risk using the strain energy, von-Mises stress, and von-Mises strain criteria during the single-leg stance and the sideways fall configurations. Choosing a proper failure criterion in hip fracture risk assessment is very important. The aim of this study is to define hip fracture risk index using the strain energy, von Mises stress, and von Mises strain criteria and compare the… More >

  • Open Access


    Finite Element Model Updating for Structural Health Monitoring

    Amirabbas Haidarpour, Kong Fah Tee*

    Structural Durability & Health Monitoring, Vol.14, No.1, pp. 1-17, 2020, DOI:10.32604/sdhm.2020.08792

    Abstract This paper provides a model updating approach to detect, locate, and characterize damage in structural and mechanical systems by examining changes in measured vibration responses. Research in vibration-based damage identification has been rapidly expanding over the last few decades. The basic idea behind this technology is that modal parameters (notably frequencies, mode shapes, and modal damping) are functions of the physical properties of the structure (mass, damping, and stiffness). Therefore, changes in the physical properties will cause changes in the modal properties which could be obtained by structural health monitoring (SHM). Updating is a process… More >

  • Open Access


    A Study on the Finite Element Model for Head Injury in Facial Collision Accident

    Bin Yang1,2,3,*, Hao Sun1, Aiyuan Wang1, Qun Wang2

    Molecular & Cellular Biomechanics, Vol.17, No.1, pp. 49-62, 2020, DOI:10.32604/mcb.2019.07534

    Abstract In order to predict and evaluate injury mechanism and biomechanical response of the facial impact on head injury in a crash accident. With the combined modern medical imaging technologies, namely computed tomography (CT) and magnetic resonance imaging (MRI), both geometric and finite element (FE) models for human head-neck with detailed cranio-facial structure were developed. The cadaveric head impact tests were conducted to validate the headneck finite element model. The intracranial pressure, skull dynamic response and skull-brain relative displacement of the whole head-neck model were compared with experimental data. Nine typical cases of facial traffic accidents More >

  • Open Access

    Anisometry Anterior Cruciate Ligament Sport Injury Mechanism Study: A Finite Element Model with Optimization Method

    Na Li*, Wei Wang*, Bin Ye*, Song Wu†,‡

    Molecular & Cellular Biomechanics, Vol.11, No.2, pp. 87-100, 2014, DOI:10.3970/mcb.2014.011.087

    Abstract ACL damage is one the most frequent causes of knee injuries and thus has long been the focus of research in biomechanics and sports medicine. Due to the anisometric geometry and functional complexity of the ACL in the knee joint, it is usually difficult to experimentally study the biomechanics of ACLs. Anatomically ACL geometry was obtained from both MR images and anatomical observations. The optimal material parameters of the ACL were obtained by using an optimization-based material identification method that minimized the differences between experimental results from ACL specimens and FE simulations. The optimal FE… More >

  • Open Access


    Structural Damage Detection using Spatial Fourier Coefficients of Mode Shapes of Beams Simply Supported at Both Ends

    Gouravaraju Saipraneeth1, Ranjan Ganguli2

    Structural Durability & Health Monitoring, Vol.7, No.1&2, pp. 23-64, 2011, DOI:10.3970/sdhm.2011.007.023

    Abstract In this paper, the effect of damage on mode shape related parameters of a beam is investigated. The damage is represented by a localized reduction in beam stiffness. The damage location and amount is varied using a finite element model of the beam to obtain the mode shapes. A beam which is simply supported at both ends is used for the numerical results. The periodic nature of the beam is exploited to obtain spatial Fourier coefficients of the mode shapes. As the damage location and size are varied, it is found that the Fourier coefficients More >

  • Open Access


    Finite Element Modelling Predicts Large Accommodation Induced Optic Nerve Head Deformations

    Xiaofei Wang1,2,*, Yubo Fan1,2

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 112-112, 2019, DOI:10.32604/mcb.2019.07053

    Abstract Accommodation is the ability of the eye to adjust its lens thickness to alter the refractive power through the contraction of ciliary muscles. The loss of accommodation ability due to aging leads to presbyopia, a condition in which the eye is unable to focus on near objects. Glaucoma is a disease that vision is impaired due to damage of the retinal ganglion cell at the optic nerve head (ONH) region, which is the leading cause of irreversible blindness worldwide. The biomechanical theory of glaucoma suggests that the deformations of ONH tissues could (directly or indirectly)… More >

  • Open Access


    Magnetic Resonance Image-Based Modeling for Neurosurgical Interventions

    Yongqiang Li1,#, Changxin Lai1,#, Chengchen Zhang2, Alexa Singer1, Suhao Qiu1, Boming Sun2, Michael S. Sacks3, Yuan Feng1,*

    Molecular & Cellular Biomechanics, Vol.16, Suppl.2, pp. 111-111, 2019, DOI:10.32604/mcb.2019.07098

    Abstract Surgeries such as implantation of deep brain stimulation devices require accurate placement of devices within the brain. Because placement affects performance, image guidance and robotic assistance techniques have been widely adopted. These methods require accurate prediction of brain deformation during and following implantation. In this study, a magnetic resonance (MR) image-based finite element (FE) model was proposed by using a coupled Eulerian-Lagrangian method. Anatomical accuracy was achieved by mapping image voxels directly to the volumetric mesh space. The potential utility was demonstrated by evaluating the effect of different surgical approaches on the deformation of the… More >

  • Open Access


    Finite Element Modeling of Fatigue Crack Growth in Curved-Welded Joints Using Interface Elements

    M. S. Alam1, M.A. Wahab1,2

    Structural Durability & Health Monitoring, Vol.1, No.3, pp. 171-184, 2005, DOI:10.3970/sdhm.2005.001.171

    Abstract Fatigue life of curved structural joints in ship structures under constant amplitude cyclic loading has been studied in this research. A new approach for the simulation of fatigue crack growth in welded joints has been developed and the concept has been applied to welded curved butt-joints. The phenomena of crack propagation and interface debonding can be regarded as the formation of new surfaces. Thus, it is possible to model these problems by introducing the mechanism of surface formation. In the proposed method, the formation of new surface is represented by interface element based on the… More >

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