Finite Element Analysis of Porous Titanium Alloy Hip Stem to Evaluate the Biomechanical Performance During Walking and Stair Climbing

2019 ◽  
Vol 16 (6) ◽  
pp. 1103-1115 ◽  
Author(s):  
Sami Emad Alkhatib ◽  
Hassan Mehboob ◽  
Faris Tarlochan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Titanium Alloy ◽  
Porous Titanium ◽  
Stair Climbing ◽  
Element Analysis

scholarly journals Finite element analysis of titanium alloy-graphene based mandible plate

2019 ◽  
Vol 22 (3) ◽  
pp. 324-330 ◽  
Author(s):  
Prashant Jindal ◽  
Frank Worcester ◽  
Kartikeya Walia ◽  
Anand Gupta ◽  
Philip Breedon
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Titanium Alloy ◽  
Element Analysis

scholarly journals In Vitro Fatigue Failure of Cemented Acetabular Replacements: A Hip Simulator Study

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
N. P. Zant ◽  
P. Heaton-Adegbile ◽  
J. G. Hussell ◽  
J. Tong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bone Cement ◽  
Cement Mantle ◽  
Stair Climbing ◽  
Normal Walking ◽  
Element Analysis ◽  
Cement Interface ◽  
Hip Simulator

Although hip simulators for in vitro wear testing of prosthetic materials used in total hip arthroplasty (THA) have been available for a number of years, similar equipment has yet to appear for endurance testing of fixation in cemented THA, despite considerable evidence of late aseptic loosening as one of the most significant failure mechanisms in this type of replacements. An in vitro study of fatigue behavior in cemented acetabular replacements has been carried out, utilizing a newly developed hip simulator. The machine was designed to simulate the direction and the magnitude of the hip contact force under typical physiological loading conditions, including normal walking and stair climbing, as reported by Bergmann et al. (2001, Hip 98, Freie Universitaet, Berlin). A 3D finite element analysis has been carried out to validate the function of the hip simulator and to evaluate the effects of boundary conditions and geometry of the specimen on the stress distribution in the cement mantle. Bovine pelvic bones were implanted with a Charnley cup, using standard manual cementing techniques. Experiments were carried out under normal walking and descending stairs loading conditions with selected load levels from a body weight of 75–125kg. Periodically, the samples were removed from the test rigs to allow CT scanning for the purpose of monitoring damage development in the cement fixation. The hip simulator was found to be satisfactory in reproducing the hip contact force during normal walking and stair climbing, as reported by Bergmann et al. Finite element analysis shows that the stress distributions in the cement mantle and at the bone-cement interface are largely unaffected by the geometry and the boundary conditions of the model. Three samples were tested up to 17×106cycles and sectioned post-testing for microscopic studies. Debonding at the bone-cement interface of various degrees in the posterior-superior quadrant was revealed in these samples, and the location of the failures corresponds to the highest stressed region from the finite-element analysis. Preliminary experimental results from a newly developed hip simulator seem to suggest that debonding at the bone-cement interface is the main failure mechanism in cemented acetabular replacements, and descending stairs seem to be more detrimental than normal walking or ascending stairs with regard to fatigue integrity of cement fixation.

The interfacial heat transfer coefficient in hot die forging of titanium alloy

1998 ◽  
Vol 212 (6) ◽  
pp. 485-496 ◽  
Author(s):  
Z M Hu ◽  
J W Brooks ◽  
T A Dean
Keyword(s):  
Heat Transfer ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Titanium Alloy ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Hot Forging ◽  
Element Model ◽  
Interfacial Heat Transfer Coefficient ◽  
Element Analysis

An investigation of die temperature changes and the heat transfer coefficient during hot forging of titanium alloy has been carried out using experiments and a thermal-plastic coupled finite element analysis. Hot Ti-6A1–4V rings were forged between two heated flat dies made of Inconel alloy IN718. The bottom die was instrumented with high-response thermocouples on its surface and subsurface. The recorded temperatures were analysed and used to determine the interface heat transfer coefficient between the die and the workpiece in conjunction with the thermal-plastic coupled finite element analysis using a reverse algorithm. The coefficients determined were then used in a finite element model for the analysis of the upsetting process and the results produced were in good agreement with the experimental data.

INVESTIGATING BIOMECHANICS OF DIFFERENT MATERIALS AND ANGLES OF BLADES OF FORCEPS FOR OPERATIVE DELIVERY BY FINITE ELEMENT ANALYSIS

2016 ◽  
Vol 16 (04) ◽  
pp. 1650046 ◽  
Author(s):  
KUO-MIN SU ◽  
MU-HSIEN YU ◽  
HER-YOUNG SU ◽  
YU-CHI WANG ◽  
KUO-CHIH SU
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Titanium Alloy ◽  
Vaginal Delivery ◽  
Medical Equipment ◽  
Biomechanical Analysis ◽  
Operative Delivery ◽  
Excessive Force ◽  
Element Analysis

Using of forceps during labors and vaginal delivery accomplished operative deliveries in some circumstances. Forceps may induce fractures in the neonatal skull if excessive force is applied to it during an operative delivery. Therefore, newborns may be affected by forceps. The aim of this study was to investigate the effects of different curve angles and materials of the blades of forceps on neonates during labor or delivery for gynecologists and obstetricians using a finite element analysis (FEA). Computer models of the forceps, neonate’s scalp, and skull, were generated for the FEA. Moreover, the use of different materials (stainless steel and titanium alloy) and three different angles of the blades of forceps (20[Formula: see text], 40[Formula: see text], and 60[Formula: see text]) on a newborn’s head were simulated in a biomechanical analysis. The results indicate that a larger curve angle of the blades of forceps can decrease the stress and pressure on the neck of the newborn but may lead to rotation toward the posterior side. Moreover, forceps made of a lower Young’s modulus material can also reduce the stress and pressure on the neck of the newborn. It is hoped that this research can provide a more reasonable reference for manufacturers to design better medical equipment such as forceps in the future for obstetricians and gynecologists to use to attenuate the stress and pressure on the neck of a newborn.

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