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Finite element analysis

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https://www.readbyqxmd.com/read/28646754/free-energy-analysis-of-cell-spreading
#1
Eóin McEvoy, Vikram S Deshpande, Patrick McGarry
In this study we present a steady-state adaptation of the thermodynamically motivated stress fiber (SF) model of Vigliotti et al. (2015). We implement this steady-state formulation in a non-local finite element setting where we also consider global conservation of the total number of cytoskeletal proteins within the cell, global conservation of the number of binding integrins on the cell membrane, and adhesion limiting ligand density on the substrate surface. We present a number of simulations of cell spreading in which we consider a limited subset of the possible deformed spread-states assumed by the cell in order to examine the hypothesis that free energy minimization drives the process of cell spreading...
June 7, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28646430/mechanical-strength-assessment-of-a-drilled-hole-in-the-contralateral-cortex-at-the-end-of-the-open-wedge-for-high-tibial-osteotomy
#2
Arnaud Diffo Kaze, Stefan Maas, Alexander Hoffmann, Dietrich Pape
BACKGROUND: This study aimed to investigate, by means of finite element analysis, the effect of a drill hole at the end of a horizontal osteotomy to reduce the risk of lateral cortex fracture while performing an opening wedge high tibial osteotomy (OWHTO). The question was whether drilling a hole relieves stress and increases the maximum correction angle without fracture of the lateral cortex depending on the ductility of the cortical bone. METHODS: Two different types of osteotomy cuts were considered; one with a drill hole (diameter 5 mm) and the other without the hole...
December 2017: Journal of Experimental Orthopaedics
https://www.readbyqxmd.com/read/28646185/the-relation-between-residual-stress-interfacial-structure-and-the-joint-property-in-the-sio2f-sio2-nb-joints
#3
Qiang Ma, Zhuo Ran Li, Lai Shan Yang, Jing Huang Lin, Jin Ba, Ze Yu Wang, Jun Lei Qi, Ji Cai Feng
In order to achieve a high-quality joint between SiO2f/SiO2 and metals, it is necessary to address the poor wettability of SiO2f/SiO2 and the high residual stress in SiO2f/SiO2-Nb joint. Here, we simultaneously realize good wettability and low residual stress in SiO2f/SiO2-Nb joint by combined method of HF etching treatment and Finite Element Analysis (FEA). After etching treatment, the wettability of E-SiO2f/SiO2 was improved, and the residual stress in the joint was decreased. In order to better control the quality of joints, efforts were made to understand the relationship between surface structure of E-SiO2f/SiO2 and residual stress in joint using FEA...
June 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28645850/biomechanical-analysis-using-fea-and-experiments-of-a-standard-plate-method-versus-three-cable-methods-for-fixing-acetabular-fractures-with-simultaneous-tha
#4
Mina S R Aziz, Omar Dessouki, Saeid Samiezadeh, Habiba Bougherara, Emil H Schemitsch, Radovan Zdero
Acetabular fractures potentially account for up to half of all pelvic fractures, while pelvic fractures potentially account for over one-tenth of all human bone fractures. This is the first biomechanical study to assess acetabular fracture fixation using plates versus cables in the presence of a total hip arthroplasty, as done for the elderly. In Phase 1, finite element (FE) models compared a standard plate method versus 3 cable methods for repairing an acetabular fracture (type: anterior column plus posterior hemi-transverse) subjected to a physiological-type compressive load of 2207N representing 3 x body weight for a 75kg person during walking...
June 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28645848/fe-and-experimental-study-on-how-the-cortex-material-properties-of-synthetic-femurs-affect-strain-levels
#5
Vitor M M Lopes, Maria A Neto, Ana M Amaro, Luis M Roseiro, M F Paulino
The primary aim of this work was to validate the "numerical" cortex material properties (transversely isotropic) of synthetic femurs and to evaluate how the strain level of the cancellous bone can be affected by the FE modeling of the material's behavior. Sensitivity analysis was performed to find out if the parameters of the cortex material affect global strain results more than the Polyurethane (PU) foam used to simulate cancellous bone. Standard 4th generation composite femurs were made with 0.32g/cm(3) solid PU foam to model healthy cancellous bone, while 0...
June 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28645667/effect-of-different-restorative-crown-and-customized-abutment-materials-on-stress-distribution-in-single-implants-and-peripheral-bone-a-three-dimensional-finite-element-analysis-study
#6
Necati Kaleli, Duygu Sarac, Safak Külünk, Özgür Öztürk
STATEMENT OF PROBLEM: In recent years, the use of resin-matrix ceramics and polyetheretherketone (PEEK) abutments has been suggested to absorb excessive stresses on dental implants. However, only a few studies have evaluated the effect of these materials on stress distribution in implants and peripheral bone structure. PURPOSE: The purpose of this finite element analysis was to evaluate the biomechanical behaviors of resin-matrix ceramics and PEEK customized abutments in terms of stress distribution in implants and peripheral bone...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28645665/experimental-evaluation-of-stress-distribution-with-narrow-diameter-implants-a-finite-element-analysis
#7
Sezgi Cinel, Ersan Celik, Elcin Sagirkaya, Onur Sahin
STATEMENT OF PROBLEM: Narrow diameter implants were developed to allow placement in narrow alveolar ridges. Clinicians may have concerns about the durability and function of such implants. PURPOSE: The purpose of this finite element study was to compare the stress values occurring on the implant and at the implant bone interface after the application of the static and dynamic forces on narrow diameter, titanium and titanium-zirconia implants in the maxillary and mandibular second premolar region...
June 20, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28643926/fluid-pressurization-and-tractional-forces-during-tmj-disc-loading-a-biphasic-finite-element-analysis
#8
Y Wu, S E Cisewski, F Wei, X She, T S Gonzales, L R Iwasaki, J C Nickel, H Yao
OBJECTIVES: To investigate the ploughing mechanism associated with tractional force formation on the temporomandibular joint (TMJ) disc surface. SETTING AND SAMPLE POPULATION: Ten left TMJ discs were harvested from 6- to 8-month-old male Yorkshire pigs. MATERIALS AND METHODS: Confined compression tests characterized mechanical TMJ disc properties, which were incorporated into a biphasic finite element model (FEM). The FEM was established to investigate load carriage within the extracellular matrix (ECM) and the ploughing mechanism during tractional force formation by simulating previous in vitro plough experiments...
June 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/28642468/metal-vapor-micro-jet-controls-material-redistribution-in-laser-powder-bed-fusion-additive-manufacturing
#9
Sonny Ly, Alexander M Rubenchik, Saad A Khairallah, Gabe Guss, Manyalibo J Matthews
The results of detailed experiments and finite element modeling of metal micro-droplet motion associated with metal additive manufacturing (AM) processes are presented. Ultra high speed imaging of melt pool dynamics reveals that the dominant mechanism leading to micro-droplet ejection in a laser powder bed fusion AM is not from laser induced recoil pressure as is widely believed and found in laser welding processes, but rather from vapor driven entrainment of micro-particles by an ambient gas flow. The physics of droplet ejection under strong evaporative flow is described using simulations of the laser powder bed interactions to elucidate the experimental results...
June 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28639517/development-of-finite-element-model-for-customized-prostheses-design-for-patient-with-pelvic-bone-tumor
#10
Taimoor Iqbal, Lei Shi, Ling Wang, Yaxiong Liu, Dichen Li, Mian Qin, Zhongmin Jin
The aim of this study was to design a hemi-pelvic prosthesis for a patient affected by pelvic sarcoma. To investigate the biomechanical functionality of the pelvis reconstructed with designed custom-made prosthesis, a patient-specific finite element model of whole pelvis with primary ligaments inclusive was constructed based on the computed tomography images of the patient. Then, a finite element analysis was performed to calculate and compare the stress distribution between the normal and implanted pelvis models when undergoing three different static conditions-both-leg standing, single-leg standing for the healthy and the affected one...
June 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28639173/numerical-modelling-of-femur-fracture-and-experimental-validation-using-bone-simulant
#11
Miguel Marco, Eugenio Giner, Ricardo Larraínzar, José Ramón Caeiro, María Henar Miguélez
Bone fracture pattern prediction is still a challenge and an active field of research. The main goal of this article is to present a combined methodology (experimental and numerical) for femur fracture onset analysis. Experimental work includes the characterization of the mechanical properties and fracture testing on a bone simulant. The numerical work focuses on the development of a model whose material properties are provided by the characterization tests. The fracture location and the early stages of the crack propagation are modelled using the extended finite element method and the model is validated by fracture tests developed in the experimental work...
June 20, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28639146/in-vivo-visualisation-and-quantification-of-bone-resorption-and-bone-formation-from-time-lapse-imaging
#12
REVIEW
Patrik Christen, Ralph Müller
PURPOSE OF REVIEW: Mechanoregulation of bone cells was proposed over a century ago, but only now can we visualise and quantify bone resorption and bone formation and its mechanoregulation. In this review, we show how the newest advances in imaging and computational methods paved the way for this breakthrough. RECENT FINDINGS: Non-invasive in vivo assessment of bone resorption and bone formation was demonstrated by time-lapse micro-computed tomography in animals, and by high-resolution peripheral quantitative computed tomography in humans...
June 21, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28637987/three-dimensional-finite-element-analysis-of-the-effects-of-implant-diameter-and-photofunctionalization-on-peri-implant-stress
#13
Tetsuo Ohyama, Hiroyasu Yasuda, Norio Shibuya, Satomi Tadokoro, Shinya Nakabayashi, Shunsuke Namaki, Yaeko Hara, Takahiro Ogawa, Tomohiko Ishigami
Previous finite element analyses of peri-implant stress assumed a bone-implant contact (BIC) ratio of 100%, even though the BIC ratio is known to be approximately 50% or less. However, the recent development of ultraviolet treatment of titanium immediately before use, known as photofunctionalization, significantly increased the BIC ratio, to 98.2%. We used a unique finite element analysis model that enabled us to examine the effects of different BIC ratios on peri-implant stress. A three-dimensional model was constructed under conditions of vertical or oblique loading, an implant diameter of 3...
2017: Journal of Oral Science
https://www.readbyqxmd.com/read/28632058/assessment-of-model-based-image-matching-for-future-reconstruction-of-unhelmeted-sport-head-impact-kinematics
#14
Gregory J Tierney, Hamed Joodaki, Tron Krosshaug, Jason L Forman, Jeff R Crandall, Ciaran K Simms
Player-to-player contact inherent in many unhelmeted sports means that head impacts are a frequent occurrence. Model-Based Image-Matching (MBIM) provides a technique for the assessment of three-dimensional linear and rotational motion patterns from multiple camera views of a head impact event, but the accuracy is unknown for this application. The goal of this study is to assess the accuracy of the MBIM method relative to reflective marker-based motion analysis data for estimating six degree of freedom head displacements and velocities in a staged pedestrian impact scenario at 40 km/h...
February 28, 2017: Sports Biomechanics
https://www.readbyqxmd.com/read/28630862/influence-of-deformation-and-stress-between-bone-and-implant-from-various-bite-forces-by-numerical-simulation-analysis
#15
Hsin-Chung Cheng, Boe-Yu Peng, May-Show Chen, Chiung-Fang Huang, Yi Lin, Yung-Kang Shen
Endosseous oral implant is applied for orthodontic anchorage in subjects with multiple tooth agenesis. Its effectiveness under orthodontic loading has been demonstrated clinically and experimentally. This study investigates the deformation and stress on the bone and implant for different bite forces by three-dimensional (3D) finite element (FE) methods. A numerical simulation of deformation and stress distributions around implants was used to estimate the survival life for implants. The model was applied to determine the pattern and distribution of deformations and stresses within the endosseous implant and on supporting tissues when the endosseous implant is used for orthodontic anchorage...
2017: BioMed Research International
https://www.readbyqxmd.com/read/28629601/a-custom-made-temporomandibular-joint-prosthesis-for-fabrication-by-selective-laser-melting-finite-element-analysis
#16
Xiangliang Xu, Danmei Luo, Chuanbin Guo, Qiguo Rong
A novel and custom-made selective laser melting (SLM) 3D-printed alloplastic temporomandibular joint (TMJ) prosthesis is proposed. The titanium-6aluminium-4vanadium (Ti-6Al-4V) condyle component and ultra-high molecular weight polyethylene (UHMWPE) fossa component comprised the total alloplastic TMJ replacement prosthesis. For the condyle component, an optimized tetrahedral open-porous scaffold with combined connection structures, i.e. an inlay rod and an onlay plate, between the prosthesis and remaining mandible was designed...
June 16, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28625344/confined-photonic-mode-propagation-observed-in-photoemission-electron-microscopy
#17
Theodore Stenmark, R C Word, R Könenkamp
Using photoemission electron microscopy (PEEM) we present a comparative analysis of the wavelength dependence of propagating fields in a simple optical slab waveguide and a thin film photonic crystal W1-type waveguide. We utilize an interferometric imaging approach for light in the near-ultraviolet regime where a 2-photon process is required to produce photoelectron emission. The typical spatial resolution in these experiments is < 30nm. Electromagnetic theory and finite element simulations are shown to be in good agreement with the experimental observations...
June 13, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28623683/the-effects-of-unilateral-alloplastic-temporomandibular-joint-replacement-on-the-opposite-side-natural-joint-a-finite-element-analysis
#18
Burak Bekcioglu, Emel Bulut, Burcu Baş
PURPOSE: The purpose of this study was to evaluate the stress distribution on the temporomandibular joint (TMJ) prosthesis and contralateral natural TMJ with finite-element analysis. MATERIALS AND METHODS: A TMJ implant was used to create a 3-dimensional model with a computer. This model was integrated with a mandible model created with a computer by use of computed tomography images, similar to a real TMJ replacement procedure. Masticatory loads were applied to the model...
May 24, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28623521/exploring-for-the-optimal-structural-design-for-the-3d-printing-technology-for-cranial-reconstruction-a-biomechanical-and-histological-study-comparison-of-solid-vs-porous-structure
#19
Jun Young Lim, Namhyun Kim, Jong-Chul Park, Sun K Yoo, Dong Ah Shin, Kyu-Won Shim
PURPOSE: Cranioplasty for recovering skull defects carries the risk for a number of complications. Various materials are used, including autologous bone graft, metallic materials, and non-metallic materials, each of which has advantages and disadvantages. If the use of autologous bone is not feasible, those artificial materials also have constraints in the case of complex anatomy and/or irregular defects. MATERIAL AND METHODS: This study used metal 3D-printing technology to overcome these existing drawbacks and analyze the clinical and mechanical performance requirements...
June 16, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28623061/comparison-of-extraosseous-talotarsal-stabilization-implants-in-a-stage-ii-adult-acquired-flatfoot-model-a-finite-element-analysis
#20
Jian Xu, Xin Ma, Daping Wang, Wei Lu, Weimin Zhu, Kan Ouyang, Haifeng Liu, Hao Li, Luoyong Jiang
Subtalar arthroereisis has been proved to be an efficient method for correcting flexible adult flatfoot. However, the optimal sinus tarsi implant is still debated and yet to be determined. In the present study, we compared the biomechanical effects of type I and II sinus tarsi implants in stage II adult-acquired flatfoot deformity (AAFD). First, a finite element model of stage II AAFD was established in which virtual surgery of subtalar arthroereisis was simulated. The indexes of plantar stress distribution, peak von Mises of the medial and lateral columns, strain of the medial ligaments and plantar fascia, arch height, talo-first metatarsal angle, calcaneus pitch angle, talonavicular coverage angle, and hindfoot valgus angle were all compared and analyzed...
June 13, 2017: Journal of Foot and Ankle Surgery: Official Publication of the American College of Foot and Ankle Surgeons
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