Investigation of Mechanical Behaviour of the Bone Cement (PMMA) under Combined Shear and Compression Loading

2019 ◽  
Vol 41 ◽  
pp. 37-48 ◽  
Author(s):  
Habib Khellafi ◽  
Mohammed Mokhtar Bouziane ◽  
Abdelkader Djebli ◽  
Abdeldjalil Mankour ◽  
Mustapha Bendouba ◽  
...  
Keyword(s):  
Finite Elements ◽  
Bone Cement ◽  
Mechanical Behaviour ◽  
Orthopedic Surgery ◽  
Mechanical Tests ◽  
Compression Loading ◽  
Loading Direction ◽  
Cement Prosthesis ◽  
Finite Elements Model

Generally, implants fixations in orthopedic surgery are insured by bone cement; which is generated mainly from polymer polymethylmethacrylate (PMMA). Since, the cement is identified as the weakest part among bone-cement-prosthesis assembly. Hence, the characterization of mechanical behaviour is of a crucial requirement for orthopaedic surgeon’s success. In this study, we investigates the failure behaviour of bone cement, under combined shear and compression loading, for the aim to determine the strengths of bone cement for different mode loading conditions. Therefore, experimental cylindrical specimens has been tested to assess different shear-compression stresses. Based on the mechanical tests, a finite elements model of cylindrical specimens was developed to evaluate stresses distribution in the bone cement under compression, shear and combined shear-compression loading. Results show that, the load which leading to the failure of the cement decreased with increasing of the specimen angle inclination with respect of loading direction.

Characterization of Optical Fiber Bragg Gratings as Strain Sensors Considering Load Direction

2008 ◽  
Author(s):  
Michael C. Emmons ◽  
Sunny Karnani ◽  
K. P. Mohanchandra ◽  
Gregory P. Carman ◽  
Stefano Trono ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Strain Sensors ◽  
Great Promise ◽  
Fiber Direction ◽  
Load Direction ◽  
Isotropic Composite ◽  
Loading Direction

This study investigates the influence of lay-up and load direction on embedded optical fiber Bragg gratings (FBGs) used as strain sensors. FBGs have shown great promise for application to structural health monitoring with advantages of small size and cylindrical geometry readily allowing for embedment within fiber reinforced composites. Characterization of the embedded FBGs is necessary to develop a rugged and reliable strain sensor. This paper specifically explores the effects of loading direction on the FBG strain outputs. A well behaved baseline case is established with results for gratings loaded parallel to the optical fiber direction while embedded parallel to the adjacent structural fibers in a quasi-isotropic composite. Results and analysis are also presented for a case involving a composite fabricated with the optical and structural fibers parallel to each other but perpendicular to the loading direction. Extremely good results are obtained relating FBG strain measurements with that of surface mounted resistance strain gauges.

scholarly journals Estimation of Energy Requirement of Jatropha Curcas L. Seedcake Briquettes under Compression Loading

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1980 ◽  
Author(s):  
Tatiana Ivanova ◽  
Abraham Kabutey ◽  
David Herák ◽  
Cimen Demirel
Keyword(s):  
Mechanical Behaviour ◽  
Jatropha Curcas ◽  
Energy Requirement ◽  
Testing Machine ◽  
P Value ◽  
Force Coefficient ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Deformation Curves ◽  
Deformation Coefficient

The energy requirement of Jatropha curcas L. seedcake of different dimensions (4.5, 5.6, 6.7, 8 and 10 mm) for briquette compaction was investigated under compression loading (100, 200, 300 and 400 kN) using the universal compression-testing machine. The parameters measured and/or calculated were the deformation, thickness, numerical energy and theoretical energy. The statistical analysis results show that compression forces had a significant effect (P-value < 0.05) on the amounts of deformation and thickness, while that of the dimensions of the sample did not. The increase in compression forces increased the numerical energy while that of samples dimensions caused a decrease. Using the tangent curve mathematical model; the force coefficient of mechanical behaviour (kN), the deformation coefficient of mechanical behaviour and the fitting curve function exponent were determined for describing the experimental dependency between the force and deformation curves as well as the numerical energies of densified jatropha seedcake briquettes.

Preparation and characterization of calcium phosphate bone cement with rapidly-generated tubular macroporous structure by incorporation of polysaccharide-based microstrips

2017 ◽  
Vol 43 (4) ◽  
pp. 3616-3622 ◽  
Author(s):  
Kannaporn Pooput ◽  
Naruporn Monmaturapoj ◽  
Jitlada Sansatsadeekul ◽  
Somruethai Channasanon ◽  
Autcharaporn Srion
Keyword(s):  
Calcium Phosphate ◽  
Bone Cement ◽  
Macroporous Structure ◽  
Calcium Phosphate Bone Cement

A nonsteady-state finite-elements model of the temperature field in the direct electric heating of a powder mixture

1988 ◽  
Vol 27 (3) ◽  
pp. 185-189
Author(s):  
A. I. Tsitrin ◽  
V. Ya. Belousov ◽  
A. V. Pilipchenko ◽  
A. N. Khomchenko ◽  
L. D. Lutsak
Keyword(s):  
Temperature Field ◽  
Finite Elements ◽  
Powder Mixture ◽  
Electric Heating ◽  
Nonsteady State ◽  
Finite Elements Model
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