Finite Element Analysis and Strain-gauge Studies of Vertical Root Fracture

2003 ◽  
Vol 29 (8) ◽  
pp. 529-534 ◽  
Author(s):  
V LERTCHIRAKARN ◽  
J PALAMARA ◽  
H MESSER
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Gauge ◽  
Element Analysis ◽  
Root Fracture ◽  
Vertical Root Fracture

scholarly journals Biomechanical Evaluation of the Mandibular First Molar After Simulated Occlusal Wear Using 3D Finite Element Analysis

2022 ◽  
Author(s):  
Ke Guo ◽  
Shoufu Sun ◽  
Yueqi Shi ◽  
Ying Zhang ◽  
Wenjia Wei ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Occlusal Surface ◽  
Surface Wear ◽  
Element Analysis ◽  
Root Fracture ◽  
Vertical Root Fracture ◽  
Tooth Fracture ◽  
Occlusal Wear ◽  
Mandibular First Molar

Abstract PURPOSE：This study aimed to investigate the biomechanical basis of vertical tooth fracture occurring in the mesial root of the mandibular first molar. METHODS：We used 3D finite elements to analyze the stress distribution and transient displacement of the mandibular first molar after occlusal surface wear and tooth tilt. Based on four degrees of wear within each of the surface wear and tooth tilt groups, eight models were established in addition to the control model. A simulated bite force of 200 N was loaded on the occlusal surface, and nonlinear finite element analysis was used to explore the biomechanical basis of vertical root fracture. RESULTS：When the distal tipping angle of the abrasion plane of the mandibular first molar increased from 5° to 15°, the angle between the instantaneous displacement contours and the long axis of the tooth decreased. Meanwhile, the mesial root was found to suffer the highest stress concentration, and the possibility of longitudinal root fracture was increased. CONCLUSION: By evaluating the biomechanical effect of tooth wear and occlusal loading, we are able to identify some clinical interventions that may prevent vertical tooth fracture.

Vertical Root Fracture in Upper Premolars with Endodontic Posts: Finite Element Analysis

2009 ◽  
Vol 35 (1) ◽  
pp. 117-120 ◽  
Author(s):  
Andrea F.V. Santos ◽  
Carina B. Tanaka ◽  
Raul G. Lima ◽  
Camila O.M. Espósito ◽  
Rafael Y. Ballester ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Root Fracture ◽  
Vertical Root Fracture

Theoretical and experimental stress analyses of centrifugal fan impellers

1978 ◽  
Vol 13 (3) ◽  
pp. 141-147 ◽  
Author(s):  
R Bell ◽  
P P Benham
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Gauge ◽  
Simplified Model ◽  
Centrifugal Fan ◽  
Experimental Stress ◽  
Stress Distributions ◽  
Element Analysis ◽  
Stress Analyses

Brittle-lacquer and strain-gauge methods and a finite-element analysis are used to determine stress distributions in a simplified model and an actual centrifugal fan impeller.

3D Analysis for Identification of the Proper Type of Post to Restore the Endodontic Treated Teeth

2014 ◽  
Vol 658 ◽  
pp. 441-446
Author(s):  
Ruxandra Margarit ◽  
Stefan Sorohan ◽  
Alice Tanasescu ◽  
Constantin Dăguci ◽  
Oana Cella Andrei
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Root Canal ◽  
3D Analysis ◽  
Analysis Method ◽  
Element Analysis ◽  
Root Fracture ◽  
Finite Element Analysis Method ◽  
Endodontic Retreatment ◽  
Posterior Area

Abstract. The problem of root fracture in case of prosthetically restored non-vital teeth is a common concern among clinicians. These fractures are caused by increasing the diameter of the root canal during the endodontic retreatment and occure on the dental arches in both the anterior and posterior area. Such treatment failures lead to extraction, therefore the physician’s goal is to limit as much as possible their occurrence. We used finite element analysis method to find out what type of corono-radicular restoration is more appropriate in order to avoid fractures. We selected two of the most commun posts used in our country: metallic NiCr casted RCR (corono-radicular reconstruction) and prefabricated fiberglass endodontic posts of various diameters and we analyzed the existing tensions in the dental structures that would predispose the root to fracture.

scholarly journals A Novel Compact Multi-Axis Force Sensor

2020 ◽  
Vol 10 (12) ◽  
pp. 1-12
Author(s):  
Yash Gujarati ◽  
◽  
Ravindra Thamma
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Data Acquisition ◽  
Strain Gauge ◽  
Force Sensor ◽  
Robotic Arm ◽  
Element Analysis ◽  
Stage Of Development ◽  
Accuracy And Repeatability

This paper presents the development of a sixaxis force/torque (FTS) sensor using crossbeams for a robotic arm. The sensor produced in this paper is a new unique design that was developed under rigorous trial and testing using finite element analysis (FEA) at every stage of development. Additionally, the FTS presented uses strain gauge technology and data-acquisition (DAQ) to measure and record forces in Fx, Fy, and Fz direction along with torque in Mx, My, and Mz direction. FTS was tested, calibrated, and fitted on a robotic arm to test its accuracy and repeatability

scholarly journals The Analysis and Resolution of a Fatigue Failure of a Low Pressure Turbine Blade Caused by the Excitation of a Bladed Disc Mode of Vibration

1997 ◽  
Author(s):  
Malcolm C. Staddon ◽  
Paul R. Box ◽  
Barry Barnett ◽  
Tony Horton ◽  
Geoff H. Ballans
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Turbine Blade ◽  
Fatigue Failure ◽  
Strain Gauge ◽  
High Frequency ◽  
Low Pressure ◽  
Dynamic Strain ◽  
Element Analysis ◽  
Low Pressure Turbine

A high cycle fatigue failure of a low pressure turbine blade was investigated. Strain gauge tests of a running engine indicated a high dynamic response of the blade at the nozzle passing frequency. This could be attributed to the excitation of a bladed disc mode of vibration. A Finite Element analysis of the low pressure turbine blades and discs, together with bench testing of the complete structure, confirmed the existence of a high frequency 2nd Nodal Diameter mode of vibration. The levels of dynamic strain determined through strain gauge tests were found to be sufficient enough to explain the failure at the given location. Having understood the problem, the situation was resolved through the use of Finite Element analysis with a short term modification to the original blade aerofoil to prevent the mode from being excited. An aero/mechanical re-design of both the low pressure turbine rotor and the stator was undertaken to resolve the problem by both returning the blade to avoid high frequency excitation, and also by reducing the forcing effect of the nozzle passing frequency. The new design has been validated through strain gauge tests and endurance tests. A further improvement in performance was also obtained.

scholarly journals A Nondestructive Study Of A Carbon Fibre Epoxy Composite Plate Using Lock-In Thermography, Cyclic Loading, And Finite Element Analysis

2021 ◽  
Author(s):  
Muhammad Saleem
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Gauge ◽  
Composite Plate ◽  
Epoxy Composite ◽  
Medical Application ◽  
Strain Gauges ◽  
Fe Model ◽  
Element Analysis ◽  
Lock In

The goal of this study was to validate the results from infrared thermographic experiment by strain gauge experiments and finite element analysis (FEA) in a carbon epoxy composite plate within the linear elastic limit. A FE model of the plate was first developed and subjected to static loads. The strain values were recorded at four distinct points. Then an experiment using strain gauges was carried out for similar loading conditions and the strains were noted for the corresponding locations. The slope of the correlation plot between the FEA and strain gauge static results indicated that, although the strain gauge experimental values had an overall tendency to overestimate the strain, there was a strong correlation between the data as exhibited by the Pearson coefficient R² = 0.99. Then the stresses calculated from the strain gauge experiment under cyclic tensile loads were used to validate the results from lock-in thermography. These results also showed good agreement as R² was 0.87 and strain gauges experiement tended to underestimate the stress values. From this study, it can be concluded that lock-in thermography can be used to assess stresses in biomaterials used in medical application.

scholarly journals Internal spur gear root bending stress: A comparison of ISO 6336:1996, ISO 6336:2006, VDI 2737:2005, AGMA, ANSYS finite element analysis and strain gauge techniques

2018 ◽  
Vol 233 (5) ◽  
pp. 1713-1720
Author(s):  
Timothy J Lisle ◽  
Brian A Shaw ◽  
Robert C Frazer
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Strain Gauge ◽  
Spur Gear ◽  
Bending Stress ◽  
Element Analysis ◽  
Maximum Root ◽  
Association Method ◽  
Internal Gear

The Association of German Engineers VDI 2737:2005 and the International Organisation for Standardisation ISO 6336:2006 are universally accepted analytical procedures for the analysis of internal gears. There is no official American Gear Manufacturers Association standard for internal gear stress analysis due to the validity of inscribing the Lewis parabola within internal concave profiles and the resulting errors associated with the location of maximum root bending stress. This research investigates the differences associated with using ISO 6336, VDI 2737 and an unofficial American Gear Manufacturers Association method, all of which are compared against a potentially more accurate numerical (ANSYS) method and strain gauge techniques.

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