Fatigue behavior of Zirconia hip joint heads: Experimental results and finite element analysis

Nickel-titanium alloy are extensively used in engineering and biomedical fields for their excellent properties of shape-memory, super-elasticity and biocompatibility. Their fatigue performance has been attracted increasingly attention, because they are often used under cyclic conditions. In this paper, the ultrasonic fatigue behavior of nickel-titanium endodontic files under unconstrained condition has been studied using the self-designed ultrasonic fatigue testing equipment. The vibration and harmonious response properties of nickel-titanium endodontic files are also analyzed using finite element method. Experimental results show that the average ultrasonic fatigue life of nickel-titanium endodontic files under unconstrained conditions is more than 108. Fracture of the files always occurred at the position about 2 -3 mm near the file tip. Results of finite element analysis show that the maximum stress of the nickel-titanium endodontic files located at the position about 2 -3 mm near the file tip, where is prone to generate fatigue cracks. The results of finite element analysis are consistent with the experimental results. The scanning electronic microscope (SEM) results show that the ultrasonic fatigue cracks always initiated at the surfaces of the files, where the secondary phases or impurities existed and induced fatigue cracks under repeated stress.

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Computational structural analysis of 3D printed hip joint implant and comparison of bio-compatible coating materials for design parameters: Coating thickness, hardness, and adhesion requirements

Advances in Mechanical Engineering ◽

10.1177/1687814019887647 ◽

2019 ◽

Vol 11 (11) ◽

pp. 168781401988764

Author(s):

Ghulam Moeen Uddin ◽

Muhammad Waqar Nasir ◽

Syed Muhammad Arafat ◽

Syed Wasim Hassan Zubair ◽

Abdul Rehman ◽

...

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Hip Joint ◽

Coating Thickness ◽

Three Dimensional ◽

Experimental Results ◽

Coating Materials ◽

Element Analysis ◽

The Finite Element Analysis ◽

Joint Implants

This research article presents a design parameter assessment technique for three-dimensional printed hip joint implants. A coupled experimental-simulation-based design technique, addressing minimum coating thickness, hardness, and adhesion requirements, is proposed for safe designs of individual three-dimensional printed hip joint implants. The purpose of this study is to analyze the mechanical properties of individual three-dimensional scanned hip joint human bone geometry through numerical simulation and relate these properties to hardness and adhesion values of bio-compatible coatings. The hardness and adhesion experimental results are discussed, which are then related to numerically obtained normal and shear stresses. Finite element analysis on original bone three-dimensional scanned model along with experimental results for investigating the minimum design requirements has not been reported before. Four ceramic coating materials, that is, alumina, CoCrMo, TiN, and zirconia, are discussed for each routine human physical activity. A comprehensive mesh independence study is conducted to ensure that the mesh has no effect on the variation of results. After finite element analysis, it was concluded that the pelvis bone can be taken as a vital bone for recommending design conditions. The finite element results are then coupled with experimental results as the maximum principal stress obtained from the finite element analysis is used to obtain minimum hardness requirements. Similarly, maximum shear stress obtained from the finite element analysis is used to obtain minimum adhesion requirements for three-dimensional printed implants. The coating thickness necessary to obtain minimum hardness and adhesion requirements is then predicted for TiN coating case.

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Tire Cornering Simulation Using an Explicit Finite Element Analysis Code

Tire Science and Technology ◽

10.2346/1.2135960 ◽

1998 ◽

Vol 26 (2) ◽

pp. 109-119 ◽

Cited By ~ 30

Author(s):

M. Koishi ◽

K. Kabe ◽

M. Shiratori

Keyword(s):

Finite Element Method ◽

Finite Element Analysis ◽

Finite Element ◽

Test System ◽

Experimental Results ◽

The Finite Element Method ◽

Element Analysis ◽

Explicit Finite Element ◽

Explicit Finite Element Analysis ◽

Element Method

Abstract The finite element method has been used widely in tire engineering. Most tire simulations using the finite element method are static analyses, because tires are very complex nonlinear structures. Recently, transient phenomena have been studied with explicit finite element analysis codes. In this paper, the authors demonstrate the feasibility of tire cornering simulation using an explicit finite element code, PAM-SHOCK. First, we propose the cornering simulation using the explicit finite element analysis code. To demonstrate the efficiency of the proposed simulation, computed cornering forces for a 175SR14 tire are compared with experimental results from an MTS Flat-Trac Tire Test System. The computed cornering forces agree well with experimental results. After that, parametric studies are conducted by using the proposed simulation.

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Experimental Research on the Magnetic Field Sensitive Polymeric Actuator

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.287-290.603 ◽

2011 ◽

Vol 287-290 ◽

pp. 603-607

Author(s):

Chun Lin Xia ◽

Yang Fang Wu ◽

Qian Qian Lu

Keyword(s):

Magnetic Field ◽

Finite Element Analysis ◽

Finite Element ◽

Energy Conversion ◽

Experimental Research ◽

Experimental Results ◽

Deformation Characteristics ◽

Analysis Software ◽

Element Analysis ◽

The Magnetic Field

Using domestic MFSP membrane as a medium of energy conversion, a kind of MFSP actuator was designed. The dedicated test equipment was constructed for experimental research, and the experimental results were given. The strip and circular MSFP membrane were analyzed qualitatively to obtain the deformation characteristics of membrane by finite element analysis software.

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Fabrication and finite element analysis of vibrating parallel film actuator made with cellulose acetate for potential haptic application

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406215598802 ◽

2016 ◽

Vol 230 (15) ◽

pp. 2720-2727 ◽

Cited By ~ 1

Author(s):

Md Mohiuddin ◽

Asma Akther ◽

Eun Byul Jo ◽

Hyun Chan Kim ◽

Jaehwan Kim

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Cellulose Acetate ◽

Vibration Characteristics ◽

Experimental Results ◽

Vibration Velocity ◽

Frequency Range ◽

Actuation Frequency ◽

Element Analysis ◽

Wide Range

The present study investigates a film actuator made with dielectric cellulose acetate films separated by narrow spacers as a means of electrostatic actuation for potential haptic application. Fabrication process for the actuator is explained along with experiments conducted over a wide frequency range of actuation frequency. A valid finite element simulation of the actuator is made on the quarter section of the actuator by using full 3D finite elements. Vibration characteristics such as fundamental natural frequency, mode shape and output velocity in the frequency range for haptic feeling generation are obtained from the finite element analysis and compared with the experimental results. Experimental results demonstrate that the finite element model is practical and effective enough in predicting the vibration characteristics of the actuator for haptic application. The film actuator shows many promising properties like high transparency, wide range of actuation frequency and high vibration velocity for instance.

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Maximum Stress at Intersecting Bores of Pressurized Blocks

ASME 1994 International Computers in Engineering Conference and Exhibition ◽

10.1115/cie1994-0433 ◽

1994 ◽

Author(s):

Ajay Garg

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Tensile Stress ◽

Element Model ◽

Maximum Tensile Stress ◽

Pressure Vessels ◽

Experimental Results ◽

Empirical Methods ◽

Element Analysis ◽

Matched Design

Abstract In high pressure applications, rectangular blocks of steel are used instead of cylinders as pressure vessels. Bores are drilled in these blocks for fluid flow. Intersecting bores with axes normal to each other and of almost equal diameters, produce stresses which can be many times higher than the internal pressure. Experimental results for the magnitude of maximum tensile stress along the intersection contour were available. A parametric finite element model simulated the experimental set up, followed by correlation between finite element analysis and experimental results. Finally, empirical methods are applied to generate models for the maximum tensile stress σ11 at cross bores of open and close ended blocks. Results from finite element analysis and empirical methods are further matched. Design optimization of cross bores is discussed.

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Two-Dimensional Finite Element Analysis of Laboratory Seawall Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.580-583.2134 ◽

2014 ◽

Vol 580-583 ◽

pp. 2134-2140

Author(s):

Jian Zhang ◽

Jian Feng Zhai ◽

Xian Mei Wang ◽

Jie Chen

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Numerical Analysis ◽

Numerical Results ◽

Experimental Results ◽

Base Layer ◽

Two Dimensional ◽

Element Analysis ◽

Cemented Sand ◽

Dimensional Finite Element

Two-Dimensional finite element analysis was used to investigate the performance of seawall construction over weak subgrade soil using artificial base layer material consisted of cemented sand cushion comprising geosynthetics materials. Two types of base layer materials pure sand and cemented sand comprising husk rich ash and two types of geosynthetics materials geogrid and geotextile were used. Constitutive models were used to represent different materials in numerical analysis. The competence of two-dimensional numerical analysis was compared with experimental results. Numerical results showed a superior harmony with the experimental results. Finite element analysis model proved to be a great tool to determine the parameters that are difficult to measure in laboratory experiments. In addition, finite element analysis has the benefit of cost and time saving when compared to experimental investigation work. Numerical results showed strain induced in geosynthetics eliminated beyond a distance approximately equal six times of footing width.

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