Simulation of Three-Point Bending Test of Titanium Foam for Biomedical Applications

2008 ◽  
Vol 32 ◽  
pp. 237-240 ◽  
Author(s):  
S. Kashef ◽  
S.A. Asgari ◽  
Peter D. Hodgson ◽  
Wen Yi Yan
Keyword(s):  
Biomedical Applications ◽  
Material Model ◽  
Bending Test ◽  
Published Data ◽  
Mechanical Behaviors ◽  
Foam Material ◽  
New Approach ◽  
Three Point Bending ◽  
Al Foam ◽  
Titanium Foam

Using Titanium (Ti) foam as an implant material is a new approach for biomedical applications and it is important to understand the mechanical behaviors of this new foam material. In the present study, the bending of the Ti foam has been simulated and compared against recently published data [1]. FE Analysis has been performed by Abaqus software. Stiffness and Yield strength of foams between 50% (cortical bone) to 80% (cancellous bone) porosity range were considered. This study showed that crushable foam material model in Abaqus, which has developed primarily for Aluminum (Al) foam alloys, is also valid for Ti Foam before any crack or damage occurs in the sample.

Verification of Numerical Model for Trabecular Tissue Using Compression Test and Time-Lapse X-Ray Radiography Based on Material Model Determined from Three-Point Bending Test of Single Trabecula

2013 ◽  
Vol 586 ◽  
pp. 265-269 ◽  
Author(s):  
Petr Zlámal ◽  
Tomáš Doktor ◽  
Ondřej Jiroušek ◽  
Ivan Jandejsek
Keyword(s):  
Compression Test ◽  
Plastic Material ◽  
Material Model ◽  
Cylindrical Sample ◽  
Bending Test ◽  
Micro Computed Tomography ◽  
Fe Method ◽  
X Ray ◽  
Three Point Bending ◽  
Complex Sample

The aim of this study is to determine constitutive constants for elasto-plastic material model with damage for single trabecula based on the indirect simulation of micromechanical testing and its verification at macro level using compression test of the cylindrical sample of the trabecular tissue. Three-point bending test of isolated trabeculae was performed in a shielding box and deflection of the sample was acquired using X-ray microradiography. Measured values (displacements of markers) were used for indirect identification of the material model for single trabecula using finite element (FE) method. The bending test was simulated and results were fitted to experimentally obtained values and the appropriate set of material constants was determined. To verify the applicability of the identified material model the compression test of the complex sample was carried out. Cylindrical sample was incrementally loaded and each loading state was captured using the micro-computed tomography. Material model identified from three-point bending test was applied to the model of complex sample and the simulation of the compression test was performed.

scholarly journals Results verification of numerical simulation of the side impact of a vehicle in a three-point bending test

2021 ◽  
Vol 1199 (1) ◽  
pp. 012055
Author(s):  
E Evin ◽  
S Nemeth
Keyword(s):  
Numerical Simulation ◽  
Material Model ◽  
Alloyed Steel ◽  
Side Impact ◽  
Bending Test ◽  
Two Phase ◽  
Three Point Bending ◽  
Deformation Work ◽  
Deformation Force ◽  
Micro Alloyed Steel

Abstract The research objective was to use numerical simulation to verify safety characteristics of deformation zone reinforcements subjected to bending, obtained from experimental results of the stretch-bending test. The methodology proposed for result verification by means of numerical simulation using a three-point bending test was verified on a sheet metal strip made of micro alloyed steel H 220 PD and a two-phase ferritic-martensitic steel DP 600. Material data for the material model according to Krupkovsky were determined in the tensile test. The measured data were processed tabularly and graphically. A comparison of the deformation work constant and the stiffness and deformation force constants shows that a very good match between the measured and the calculated characteristics has been achieved. Based on the data obtained, it can be assumed that it is possible to reduce the weight of deformation elements while maintaining the required safety characteristics by replacing micro alloyed steel H 220PD with the two-phase DP steel.

scholarly journals Effect of Coconut Fiber Dosage on Flexural Performances of Magnesium Phosphate Cement

2021 ◽  
Vol 8 ◽  
Author(s):  
Zuqian Jiang ◽  
Liwen Zhang ◽  
Junping Zhang ◽  
Zhuo Sun ◽  
Jing Li
Keyword(s):  
Flexural Strength ◽  
Cementitious Materials ◽  
Cementitious Material ◽  
Bending Test ◽  
Magnesium Phosphate ◽  
Mechanical Behaviors ◽  
Coconut Fiber ◽  
Plant Fiber ◽  
Three Point Bending ◽  
New Type

Magnesium phosphate cement (MPC), as a new type of inorganic cementitious material, has the advantages of fast curing speed and high early strength. However, MPC still exhibits poor toughness similar to other cementitious materials. Coconut fiber (CF), a renewable plant fiber, was found to have the potential to improve the toughness of MPC in our previous research. As a result, further research should be completed to investigate the mechanical behaviors of MPC mixed with CF. This paper focused on the effect of CF volume dosage on MPC’s flexural performances. Flexural strength, load-deflection (L-D) relationship, fractural patterns, and flexural toughness were obtained by carrying out a three-point bending test. The results showed that flexural strength first increased and then decreased with increasing CF dosage, and the optimal CF dosage for flexural strength was 3%. Besides, it could be observed from the L-D relationship that the toughness increased continuously with increasing CF dosage. Additionally, the technique of scanning electron microscopy (SEM) was employed to analyze the microstructure of MPC mixed with different CF dosages.

Social organization in the Orcadian Neolithic: identification of elite domestic structures and settlements through analysis of excavation data

2018 ◽  
Vol 40 (1) ◽  
pp. 25-53 ◽  
Author(s):  
David MacInnes
Keyword(s):  
Social Organization ◽  
Qualitative Data ◽  
Social Hierarchy ◽  
Published Data ◽  
Early Neolithic ◽  
Late Neolithic ◽  
New Approach ◽  
Qualitative Evidence ◽  
Methods Of Analysis ◽  
The Subject

The nature of social organization during the Orcadian Neolithic has been the subject of discussion for several decades with much of the debate focused on answering an insightful question posed by Colin Renfrew in 1979. He asked, how was society organised to construct the larger, innovative monuments of the Orcadian Late Neolithic that were centralised in the western Mainland? There are many possible answers to the question but little evidence pointing to a probable solution, so the discussion has continued for many years. This paper takes a new approach by asking a different question: what can be learned about Orcadian Neolithic social organization from the quantitative and qualitative evidence accumulating from excavated domestic structures and settlements?In an attempt to answer this question, quantitative and qualitative data about domestic structures and about settlements was collected from published reports on 15 Orcadian Neolithic excavated sites. The published data is less extensive than hoped but is sufficient to support a provisional answer: a social hierarchy probably did not develop in the Early Neolithic but almost certainly did in the Late Neolithic, for which the data is more comprehensive.While this is only one approach of several possible ways to consider the question, it is by exploring different methods of analysis and comparing them that an understanding of the Orcadian Neolithic can move forward.

scholarly journals Additive Manufacturing-Based In Situ Consolidation of Continuous Carbon Fibre-Reinforced Polycarbonate

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2450
Author(s):  
Andreas Borowski ◽  
Christian Vogel ◽  
Thomas Behnisch ◽  
Vinzenz Geske ◽  
Maik Gude ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Carbon Fibre ◽  
Bending Test ◽  
Thermoplastic Composites ◽  
Experimental Investigations ◽  
Material Structure ◽  
Three Point Bending ◽  
Continuous Fibre ◽  
Local Material

Continuous carbon fibre-reinforced thermoplastic composites have convincing anisotropic properties, which can be used to strengthen structural components in a local, variable and efficient way. In this study, an additive manufacturing (AM) process is introduced to fabricate in situ consolidated continuous fibre-reinforced polycarbonate. Specimens with three different nozzle temperatures were in situ consolidated and tested in a three-point bending test. Computed tomography (CT) is used for a detailed analysis of the local material structure and resulting material porosity, thus the results can be put into context with process parameters. In addition, a highly curved test structure was fabricated that demonstrates the limits of the process and dependent fibre strand folding behaviours. These experimental investigations present the potential and the challenges of additive manufacturing-based in situ consolidated continuous fibre-reinforced polycarbonate.

Effect of Concrete Mixture Composition on Acoustic Emission and Fracture Parameters Obtained from Three-Point Bending Test

2015 ◽  
Vol 1100 ◽  
pp. 152-155
Author(s):  
Libor Topolář ◽  
Hana Šimonová ◽  
Petr Misák
Keyword(s):  
Acoustic Emission ◽  
Bending Test ◽  
Mixture Composition ◽  
Three Point Bending ◽  
Concrete Mixtures ◽  
Fracture Parameters ◽  
Fracture Tests ◽  
Stress Behaviour ◽  
Bending Fracture ◽  
Fracture Processes

This paper reports the analysis of acoustic emission signals captured during three-point bending fracture tests of concrete specimens with different mixture composition. Acoustic emission is an experimental tool well suited for monitoring fracture processes in material. The typical acoustic emission patterns were identified in the acoustic emission records for three different concrete mixtures to further describe the under-the-stress behaviour and failure development. An understanding of microstructure–performance relationships is the key to true understanding of material behaviour. The acoustic emission results are accompanied by fracture parameters determined via evaluation of load versus deflection diagrams recorded during three-point bending fracture tests.

scholarly journals Experimental and Numerical simulation of a Three Point Bending Test of a Stainless Steel Beam

2021 ◽  
Vol 55 ◽  
pp. 1114-1121
Author(s):  
Daniel Jindra ◽  
Zdeněk Kala ◽  
Jiří Kala ◽  
Stanislav Seitl
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Bending Test ◽  
Steel Beam ◽  
Three Point Bending

scholarly journals A New Approach to Obtaining Nano-Sized Graphene Oxide for Biomedical Applications

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1327
Author(s):  
Paulina Bolibok ◽  
Bartosz Szymczak ◽  
Katarzyna Roszek ◽  
Artur P. Terzyk ◽  
Marek Wiśniewski
Keyword(s):  
Graphene Oxide ◽  
Biomedical Applications ◽  
Effective Concentration ◽  
New Approach ◽  
Spectral Changes ◽  
Dimethyl Sulfoxide Solution ◽  
Aggregation Processes ◽  
Initial Oxygen ◽  
Half Maximal Effective Concentration ◽  
Nano Size

Graphene oxide (GO) is one of the most exciting and widely used materials. A new method of nanographene oxide (n-GO) formation is presented. The described unique sequence of ultrasonication in dimethyl sulfoxide solution allows us to obtain different sizes of n-GO sheets by controlling the timing of the cutting and re-aggregation processes. The obtained n-GO exhibits only minor spectral changes, mainly due to the formation of S-containing surface groups; thus, it can be concluded that the material is not reduced during the process. Maintaining the initial oxygen functionalities together with the required nano-size (down to 200 nm) and high homogeneity are beneficial for extensive applications of n-GO. Moreover, we prove that the obtained material is evidently biocompatible. The calculated half-maximal effective concentration (EC50) increases by 5-fold, i.e., from 50 to 250 µg/mL, when GO is converted to n-GO. As a consequence, the new n-GO neither disturbs blood flow even in the narrowest capillaries nor triggers a toxic influence in surrounding cells. Thus, it can be a serious candidate for drugs and biomolecule carriers administered systemically.

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