Probabilistic Model of Surface Crack on the Lumbar Vertebra

2013 ◽  
Vol 471 ◽  
pp. 299-305
Author(s):  
A. Zulkifli ◽  
Ahmad K. Ariffin ◽  
M.R.M. Akramin
Keyword(s):  
Finite Element Method ◽  
Surface Crack ◽  
Maximum Stress ◽  
Crack Path ◽  
Lumbar Vertebra ◽  
Crack Size ◽  
Probability Of Failure ◽  
Biological Models ◽  
Probabilistic Study ◽  
Model Components

The objectives of this study are to determine the stress intensity factor (SIF) for different surface crack size of the lumbar vertebra and the probability of failure associated with finite element method. In this work, all the model components were meshed using the tetrahedral solid element. In order to simplify the model, all the spinal components were modeled as an isotropic and elastic material. Monte Carlo Simulation (MCS) technique was performed to conduct the probabilistic analysis using a probabilistic module in ANSYS with attempt for 100 trials. The results are observed that the maximum SIF were found in the end of crack path with 0.53 MPa.m1/2 and the corresponding probability of failure for the model is 1.22%. Sensitivity analysis had been revealed that the crack size was sensitive to the maximum stress and maximum SIF output parameters with correlation 0.989 and 0.811 respectively. The current probabilistic study is useful as a tool to understand the inherent uncertainties and variations in biological models.

Stress and Probabilistic Study of the Lumbar Vertebra under Compression Loading

2011 ◽  
Vol 52-54 ◽  
pp. 1394-1399 ◽  
Author(s):  
A. Zulkifli ◽  
Ahmad Kamal Ariffin ◽  
A.E. Ismail ◽  
Ruslizam Daud ◽  
M.R.M. Akramin
Keyword(s):  
Finite Element Method ◽  
Sensitivity Analysis ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Lumbar Vertebra ◽  
Probability Of Failure ◽  
Ansys Software ◽  
Stress Concentrations ◽  
Probabilistic Study ◽  
Model Components

The objectives of this study were to determine the stress concentration of the lumbar vertebra and the probability of failure associated with finite element method. The lumbar vertebra model was constructed in SolidWorks software and imported by ANSYS software for the analysis. In this work, all the model components were meshed using the tetrahedral solid element (SOLID186). In order to simplify the model, all the spinal components were modeled as an isotropic and elastic material. Monte Carlo Simulation (MCS) technique was performed to conduct the probabilistic analysis using a built-in probabilistic module in ANSYS with attempt for 100 trials. The results were observed that the highest stress concentrations were found in the adjacent posterior vertebral body with 1.2117 MPa and the corresponding probability of failure for the model is 3%. Sensitivity analysis had been revealed that the force applied to the facet (FORFCT) variable was sensitive to the stress and displacement output parameters and need to be emphasized. The current probabilistic study was very useful as a tool to understand the inherent uncertainties and variations in biological structures.

scholarly journals FATIGUE LIFE ANALYSIS OF RAMP DOOR FERRY RO-RO GT 1500 USING FINITE ELEMENT METHOD

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Alamsyah Alam ◽  
A. B. Mapangandro ◽  
Amalia Ika W ◽  
M U Pawara
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Life ◽  
Maximum Stress ◽  
Structural Integrity ◽  
Load Cycle ◽  
Point Load ◽  
Fatigue Life Analysis ◽  
The Given ◽  
Element Method

Ro - Ro Ferry is equipped with a connecting door between the port and the ship. The ramp door experiences load during loading and discharging of the rolling cargo. This repetitive load may cause fatigue failure. The structure of the ramp door should withstand this load. Therefore, The ramp door should be properly designed to ensure the structural integrity of the ramp door. The purpose of this research is to analyze the maximum stress and the Fatigue life of the bow ramp door. The method used is the finite element method. The given loads are several types of vehicles that are commonly transported by the ship. The given load case is the point load working at the girder plate and between the girder plate. Based on the simulation results with the given point load, the maximum stress is identified located between the girder for the large truck case with 397.02 MPa, while the minimum stress located at the girder for sedan car with 43.93 MPa. As for the fatigue life of the bow ramp door construction. it is 1.17 ~ 398.64 years, and the load cycle is 5.35 x 104 ~ 9.05 x 106 cycle. Keywords : Bow Ramp Door; Stress; Fatigue Life; Finite Element; Ferry

scholarly journals Analysis of submerged implant towards mastication load using 3D finite element method (FEM)

2016 ◽  
Vol 28 (3) ◽  
Author(s):  
Widia Hafsyah Sumarlina Ritonga ◽  
Janti Rusjanti ◽  
Nunung Rusminah ◽  
Aldilla Miranda ◽  
Tatacipta Dirgantara
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Contact Area ◽  
Maximum Stress ◽  
Implant Design ◽  
3D Finite Element ◽  
Alveolar Crest ◽  
Component Design ◽  
3D Finite Element Method ◽  
Element Method

Introduction: The surgical procedure of dental implant comprising one stage surgery for the non-submerged implant design and two stages for submerged. Submerged design is frequently used in Faculty of Dentistry Padjadjaran University as it is safer in achieving osseointegration. This study has been carried out to evaluate resistant capacity of an implant component design submerged against failure based on location and the value of internal stress during the application of mastication force using the 3D Finite Element Method (FEM). Methods: The present study used a CBCT radiograph of the mandibular patient and Micro CT Scan of one submerged implant. Radiograph image was then converted into a digital model of 3D computerized finite element, subsequently inputted the material properties and boundary condition with 87N occlusion load applied and about 29N for the shear force. Results: The maximum stress was found located at the contact area between the implant and alveolar crest with stress value registered up to 193.31MPa located within an implant body where is understandable that this value is far below allowable strength of titanium alloy of 860 MPa. Conclusion: The location of the maximum stress was located on the contact area between the implant-abutment and alveolar crest. This implant design is acceptable and no failure observed under mastication load.

Contact Stress Analysis of Gear of Crane Gearbox

2007 ◽  
Author(s):  
Zhonglai Wang ◽  
Bo Yang ◽  
Hong-Zhong Huang ◽  
Qiang Miao ◽  
Dan Ling
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Analysis ◽  
Contact Stress ◽  
Optimization Method ◽  
Probability Of Failure ◽  
Engineering Problem ◽  
Gear Transmission ◽  
Practical Engineering ◽  
Practical Engineering Problem

Gears are widely used in many practical engineering to transmit torque. In the process of meshing, contact stress will be produced which causes pitting. Shock becomes more and more serious with the increase of pitting and the probability of failure of meshing gears increases. Contact stress analysis is necessary and important to increase the reliability of gear transmission. In this paper, a fuzzy Hertz approximate optimization method and finite element method are used to deal with a practical engineering problem.

Study of Tower Surface Crack Size Effect Based on Weibull Theory

2013 ◽  
Vol 19 (4) ◽  
pp. 581-588
Author(s):  
Jun Song ◽  
Jianting Zhou ◽  
Lu Liu ◽  
Ma Sun ◽  
Hong Zhang ◽  
...  
Keyword(s):  
Size Effect ◽  
Surface Crack ◽  
Crack Size ◽  
Weibull Theory

Surface Crack Size Detection in Nuclear Fuel Rods Based on Line Structured Light

2020 ◽  
Vol 57 (22) ◽  
pp. 221013
Author(s):  
咸凯强 Xian Kaiqiang ◽  
庞静珠 Pang Jingzhu ◽  
胡俊 Hu Jun
Keyword(s):  
Nuclear Fuel ◽  
Surface Crack ◽  
Structured Light ◽  
Crack Size ◽  
Fuel Rods ◽  
On Line ◽  
Nuclear Fuel Rods

Method for evaluation of surface crack size of wind turbine main shaft by using ultrasonic diffracted waves

2020 ◽  
Vol 29 (7) ◽  
pp. 075009
Author(s):  
Cheng Jun ◽  
He Cunfu ◽  
Lyu Yan ◽  
Zheng Yang ◽  
Xie Longyang
Keyword(s):  
Wind Turbine ◽  
Surface Crack ◽  
Crack Size ◽  
Main Shaft ◽  
Diffracted Waves

Estimation of loads and stresses in abdominal muscles during slow lifts

1997 ◽  
Vol 211 (3) ◽  
pp. 271-274 ◽  
Author(s):  
K D Thomson
Keyword(s):  
Cross Section ◽  
Maximum Stress ◽  
Lumbar Vertebra ◽  
Abdominal Muscle ◽  
Abdominal Pressure ◽  
Abdominal Muscles ◽  
The Third ◽  
Stress Levels ◽  
Age Range

Calculations are made of abdominal muscle loads and stresses associated with the development of intra-abdominal pressure during slow, symmetrical lifts. The muscles considered are the rectus, transversus and the external and internal obliques. Muscle loads and stresses have been calculated in an abdominal cross-section at about the level of the third lumbar vertebra. For four cases examined, maximum stress levels for men in the 25–35 years age range appear to be 3p-4p for the rectus muscles, 15p-25p for the transversus and 4p-6p for the obliques, where p is the intra-abdominal pressure. Corresponding figures for a man aged 66 years are about 8p, 21p and 8p respectively.

Analysis of ZDDP Films on Sticking Defects by FEM during Hot Rolling of Ferritic Stainless Steel Strips

2016 ◽  
Vol 846 ◽  
pp. 96-101
Author(s):  
Liang Hao ◽  
Zheng Yi Jiang ◽  
Dian Yao Gong ◽  
Dong Bin Wei ◽  
Xia Wei Cheng ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Stainless Steel ◽  
Ferritic Stainless Steel ◽  
Hot Rolling ◽  
Steel Strip ◽  
Crack Size ◽  
Surface Characterisation ◽  
Fem Model ◽  
Steel Strips ◽  
Simulation Results

The aim of this study is to understand the effect of zinc dialkyl dithio phosphate (ZDDP) films on sticking defects during the hot rolling of ferritic stainless steel strips. The surface characterisation and crack propagation are very important for the sticking defects of ferritic stainless steel strip. A finite element method (FEM) model is constructed with different crack size ratios, in which the profile of the strip roughness and ZDDP films are taken into consideration. Simulation results show that the widths of cracks tend to be reduced with the introduction of ZDDP films, improving the sticking defects, which is confirmed by the hot rolling trials.

Sign in / Sign up

Export Citation Format

Share Document