Structure Optimization on FEM Biomechanical Model of Bioabsorable Pure Magnesium Skin Staple

2014 ◽  
Vol 1049-1050 ◽  
pp. 511-514
Author(s):  
Yong Hua Lao ◽  
Yue Shan Huang ◽  
Wei Rong Li ◽  
Ying Jun Wang
Keyword(s):  
Stainless Steel ◽  
Mechanical Strength ◽  
316L Stainless Steel ◽  
Mechanical Performance ◽  
Structure Optimization ◽  
Biomechanical Model ◽  
Pure Magnesium ◽  
Structural Deformation ◽  
Medical Implants ◽  
Surgical Suture

Skin Stapler is an alternative instrument, which makes surgy easily and quickly and owns fine-looking effect without scars after the wound healed, to traditional surgical suture for the wound skin sewing. Magnesium recently is considered to develop medical implants because of its beneficial biocompatibility and bioabsorability. Due its less mechanical strength than traditional 316L stainless steel used in common staple, this paper try to optimize the structure of pure magnesium skin staple by FEM models and simulation as so to assure its biomechanical safty. Using ADINA software, two staples with different pre-bended shoulders and the traditional staple without shoulder are modeling to analyze its stress and plastical strain during structural deformation under load. The results, not only of pure magnesium models but also of 316L stainless steel models, showed that the shoulders optimization on staple structure has important role in its mechanical performance. The research increases the possibility of bioabsorable magnesium material application on medical skin staple.

Process Technology and Mechanical Properties of Polylactic Acid Ply Yarns and 316L Stainless Steel Braids

2011 ◽  
Vol 287-290 ◽  
pp. 2656-2659 ◽  
Author(s):  
Ching Wen Lou ◽  
Wen Cheng Chen ◽  
Yueh Sheng Chen ◽  
Shih Peng Wen ◽  
Chin Wei Chang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Mechanical Strength ◽  
Polylactic Acid ◽  
316L Stainless Steel ◽  
Heating Temperature ◽  
Alkali Concentration ◽  
Process Technology ◽  
Surgical Suture ◽  
The Individual

Biodegradable polymer has been widely used in surgical suture, dressing, artificial bone and other bone-related applications. However, when compared with the human cortical bone, the pure polymer obviously did not have enough strength. The present study aimed to give preliminary insights from a pilot study of designing a scaffold of polylactic acid ply yarns composited with stainless steel (SS) braids. To evaluate the fabrication processes and alkali effects on the individual materials, the different heating temperature and alkali treating time and alkali concentration were applied to clarify the changes in mechanical strength. The experimental results showed that the strength was not significant declined with alkali and heating treatments. The retained mechanical strength was kept at 100-120 MPa and ultimately led to bone-like mechanical properties.

Processing Technology and Characteristic Evaluation of Polylactic Acid/316L Stainless Steel Composite Braids with Hydroxylapatite Deposition

2011 ◽  
Vol 332-334 ◽  
pp. 1951-1954 ◽  
Author(s):  
Jia Horng Lin ◽  
Wen Cheng Chen ◽  
Jin Jia Hu ◽  
Yueh Sheng Chen ◽  
Shih Peng Wen ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Simulated Body Fluid ◽  
Polylactic Acid ◽  
Biodegradable Polymer ◽  
Body Fluid ◽  
316L Stainless Steel ◽  
Artificial Bone ◽  
Surgical Suture ◽  
Steel Composite ◽  
Apatite Deposition

Biodegradable polymer has been widely used in surgical suture, dressing, artificial bone and other bone-related applications. Studies have demonstrated that metals, such as titanium, titanium alloys or 316L stainless steel, can be widely used in dental and maxillofacial surgeries. The present study aimed to fabricate a scaffold with a blend of multilayer polylactic acid (PLA) ply yarns with 316L stainless steel (SS) braids, which was then immersed in simulated body fluid (SBF), forming the PLA/SS composite braid with hydroxylapatite deposition. After being immersed in SBF for 14 days, the PLA/SS composite braid was covered with precipitate which was confirmed to be apatite deposition according to surface observation and EDS evaluation.

scholarly journals Different Evolutions of the Microstructure, Texture, and Mechanical Performance During Tension and Compression of 316L Stainless Steel

2020 ◽  
Vol 51 (7) ◽  
pp. 3447-3460 ◽  
Author(s):  
Moustafa El-Tahawy ◽  
Péter Jenei ◽  
Tamás Kolonits ◽  
Gigap Han ◽  
Hyeji Park ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Mechanical Performance ◽  
Tension And Compression

Finite Element Method for Predicting the Cohesive Strength of DLC Film on 316L Stainless Steel by Four Point Bend Test and Validation with Experimental Results

2011 ◽  
Vol 264-265 ◽  
pp. 1823-1831
Author(s):  
Muhammad M. Morshed ◽  
Stephen M. Daniels ◽  
M.S.J. Hashmi
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Young’S Modulus ◽  
316L Stainless Steel ◽  
Mechanical Performance ◽  
Young's Modulus ◽  
Cohesive Strength ◽  
Bend Test ◽  
Deposition Pressure ◽  
Point Bend

The mechanical performance of DLC coatings on 316L stainless steel deposited by a saddle field fast atom beam source has been evaluated using the four point bend (FPB) test. Two different deposition parameters, pressure and current were varied when depositing the films. Load-displacement measurements were carried out during the bend test to determine the load corresponding to crack initiation. This load designated as the cohesive strength of the coating which is also called the cracking resistance of coating and provides a measure of the strength of the coating. The cohesive strength of the coating was calculated based on elementary beam theory. Scanning Electron Microscopy (SEM) was used to determine the location of the crack. Finite element analysis was used to predict the stress distribution across the coating thickness. The experimental work on FPB tests has been used to support the numerical (finite element) model for the determination and prediction of film cohesive strength. It was observed that at lower deposition current, the cohesive strength increases with increased deposition pressure whereas, for higher deposition current, these values do not increase with increasing deposition pressure. The model takes into account the film’s Young’s modulus, thickness and deposition pressure and current, and has shown that it is capable of predicting film cohesive strength when combined with a theoretical formulation for brittle fracture. It has been observed that the maximum stress develops at the outer surface of the film and propagates through the film-substrate interface. This result has only been validated for films with higher Young’s modulus compared to that of the substrate material.

Effect of Surface Treatment on Surface Characteristics and Biocompatibility of AISI 316L Stainless Steel

2006 ◽  
Author(s):  
Guna Selvaduray ◽  
Steve Trigwell
Keyword(s):  
Surface Tension ◽  
Stainless Steel ◽  
316L Stainless Steel ◽  
Surface Characteristics ◽  
Critical Surface ◽  
Aisi 316L ◽  
Medical Implants ◽  
Critical Surface Tension ◽  
Aisi 316L Stainless Steel ◽  
Effect Of Surface

Surface characteristics are essential in determining the biocompatibility of medical implants. Surface treatments such as mechanical polishing, electropolishing, passivation and plastic strain of AISI 316L stainless steel was found to affect the critical surface tension, with the combined electropolishing and passivation treatment resulting in the most desirable critical surface tension for biocompatibility. AES and XPS analysis showed that electropolishing results in changing the surface chemical composition significantly. There is significant Cr enrichment on the surface, compared to the bulk. The surface Cr and Fe exist as a combination of oxides and hydroxides.

Process porosity and mechanical performance of fused filament fabricated 316L stainless steel

2019 ◽  
Vol 25 (7) ◽  
pp. 1319-1327 ◽  
Author(s):  
James Damon ◽  
Stefan Dietrich ◽  
Sasidhar Gorantla ◽  
Uwe Popp ◽  
Brando Okolo ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Mechanical Performance ◽  
Formation Mechanisms ◽  
Micro Computed Tomography ◽  
Fused Filament Fabrication ◽  
Content Type ◽  
Powder Bed ◽  
Strongly Connected ◽  
Scanning Strategies

Purpose This study aims to investigate the correlation between build orientation characteristics, part porosity and mechanical properties of the fused filament fabrication (FFF) process to provide insight into pore formation mechanisms and to establish guidelines for optimal process configurations. Design/methodology/approach Micro computed tomography and metallographic sections provide the basis for a correlation between porosity and extrusion path. Using the correlations found in this study, the way to improve printing strategies and filament properties can be deduced directly from an analysis of the print path and the final influence on mechanical performance. Findings With metal-FFF 3D printing technology, near-dense parts (0.5 Vol.%) can be fabricated. The pore architecture is strongly connected to the build direction and print strategy with parallel, elongated pore channels. Mechanical values of FFF samples are similar to metal injection-molded (MIM) parts, except the elongation to fracture. The high difference of yield strength of sintered samples compared to laser powder bed fusion (LPBF) samples can be attributed to the finer grains and a Hall–Petch hardening effect. The conclusions derived from this study are that the presented process is capable of producing comparable part qualities compared to MIM samples, with higher build rates in comparison to LPBF processes. Originality/value 316L stainless steel was successfully manufactured via FFF. This paper also addresses the effects of scanning strategies on the resulting porosity and proposes improvements to reduce residual porosity, thus increasing the mechanical performance in the future.

scholarly journals A Comparative Study of 316L Stainless Steel and a Titanium Alloy in an Aggressive Biological Medium

2019 ◽  
Vol 9 (6) ◽  
pp. 5093-5098 ◽  
Author(s):  
D. Aroussi ◽  
B. Aour ◽  
A. S. Bouaziz
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
316L Stainless Steel ◽  
Mechanical Performance ◽  
Corrosion Current ◽  
Superficial Layer ◽  
Surgical Instruments ◽  
Spinal Implant ◽  
Prolonged Contact ◽  
Steel Aisi

The electrochemical behavior of stainless steel and titanium alloys is affected after prolonged contact with basic or acidic solutions, indicating a change in their surface properties. The human body often rejects invasive devices that aim to alter the biological or chemical composition of blood or other body fluids. Stents, fixation plates and screws, spinal implant devices, aneurysm clips, intramedullary nails and stems, temporary fixation devices and surgical instruments, etc. have been made from stainless steel AISI 316L for several years. Although the mechanical performance of implants and devices may be governed by their bulk properties, their interaction with the environment is managed by the characteristics of their superficial layer. In the case of biomedical devices, resistance to corrosion and biocompatibility has paramount importance. This study compares the corrosion behavior of 316L stainless steel and a titanium alloy in a Hank solution. The obtained results show that the titanium alloy has a higher potential than 316L stainless steel and lower corrosion current.

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