Physico-Mechanical Performance Evaluation of Large Pore Synthetic Meshes with Different Textile Structures for Hernia Repair Applications

This paper studied the relationship between the textile structure of warp knitted hernia repair meshes and their physico-mechanical properties to solve the problem of hernia patch application evaluation and clear the mechanism of hernia patch structure-performance for clinical application. Six different prototypes of large pore meshes were fabricated, including four kinds of meshes with different pore shapes: H (hexagonal), D (diamond), R (round) and P (pentagonal); and two kinds of meshes with inlays: HL (hexagonal with inlays) and DL (diamond with inlays), using the same medical grade polypropylene monofilament. All meshes were designed with the same walewise density and coursewise density. Then the influence of other structural parameters on the physico-mechanical properties of the meshes was analysed. The physico-mechanical properties of these meshes tested meet the requirements of hernia repair, except mesh DL, whose tear resistance strength (12.93 ± 2.44 N in the transverse direction) was not enough. Mesh R and P demonstrated less anisotropy, and they exhibited similar physico-mechanical properties. These four kinds of meshes without inlays demonstrated similar ball burst strength properties, but mesh HL and DL exhibited better ball burst strength than the others. All in all, uniform structures are expected to result in less anisotropy, and meshes with inlays, to some extent, possess higher mechanical properties. And the ratio of open loop number to closed loop number in a repetition of weave of fabric has marked effect on the physico-mechanical properties. Thus we can meet the demands of specific patients and particular repair sites by designing various meshes with appropriate textile structures.

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Mechanical properties and microstructure of recycled mortar reinforced with hybrid fiber

International Journal of Engineering & Technology ◽

10.14419/ijet.v7i4.12279 ◽

2018 ◽

Vol 7 (4) ◽

pp. 2178 ◽

Cited By ~ 2

Author(s):

Sallehan Ismail ◽

Mohammad Asri Abd Hamid ◽

Zaiton Yaacob ◽

Dzulkarnaen Ismail ◽

Hazizan Md Akil

Keyword(s):

Mechanical Properties ◽

Flexural Strength ◽

Mechanical Strength ◽

Mechanical Performance ◽

Volume Fraction ◽

High Strength ◽

Strength Properties ◽

Recycled Aggregate ◽

Hybrid Fiber ◽

Hybrid Fibers

This study investigated the hybrid effects of two types of microfiber, namely, polypropylene and nylon, on the mechanical properties of high-strength mortar, which produced fine recycled aggregate (FRA). The amount of microfibers was maintained at a volumetric fraction of 0.6%. The microstructure and mechanical strength properties (compressive strength and flexural strength) of recycled mortar reinforced with hybrid-size microfibers were evaluated at various curing ages. Experimental results show that the inclusion of hybrid fibers significantly influenced the mechanical performance of the recycled mortar. The hybridization fiber at volume fraction 0.3% polypropylene + 0.3% nylon yielded the most promising mechanical performance. Enhancements of 8% on compressive and 11% flexural strength were achieved at 28 days. Scanning electron microscopy observations revealed that reinforcement at the microscale prohibited the initiation and growth of cracks at the micro level. High loads were required to form macrocracks within composites, thereby improving the mechanical strength of the mortar matrix.

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Ultra-Strong Knits for Personal Protective Equipment

Applied Sciences ◽

10.3390/app10186197 ◽

2020 ◽

Vol 10 (18) ◽

pp. 6197

Author(s):

Daiva Mikucioniene ◽

Liudmyla Halavska ◽

Svitlana Bobrova ◽

Tetiana Ielina ◽

Rimvydas Milasius

Keyword(s):

Mechanical Properties ◽

Personal Protective Equipment ◽

Structural Characteristics ◽

Structural Parameters ◽

Strength Properties ◽

Mechanical Tests ◽

Protective Equipment ◽

Knitted Fabrics ◽

Elongation At Break ◽

High Influence

This work focused on the development of ultra-strong knitted fabrics for personal protective equipment used for protection against mechanical damages. Such knits have to have enhanced mechanical strength properties, which strongly depend on knitting pattern and structural characteristics. Six variants of weft knitted structures were developed and knitted from ultra-high molecular weight polyethylene and additional elastomeric component. The elastomeric component was used to increase the elasticity and toughness of knits; however, it had a high influence on mechanical properties, as well. The performed mechanical tests allowed us to identify dependence of mechanical properties, such as breaking force and elongation at break and resistance to abrasion, tearing, cutting and puncture, on architecture and structural parameters of the knits. Obtained results demonstrate that elastomeric component has high influence on mechanical properties knits and can change the principal mechanical behaviour of knits.

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Effect of Nanoiron Particles Reinforced Blended Polymer Nanocomposites on Mechanical Properties

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.b7511.129219 ◽

2019 ◽

Vol 9 (2) ◽

pp. 4430-4435

Keyword(s):

Mechanical Properties ◽

Mechanical Property ◽

Mechanical Performance ◽

Chemical Reduction ◽

Property Values ◽

Strength Properties ◽

Nano Particles ◽

Resin Matrix ◽

Software Analysis ◽

The Matrix

We report on the preparation of nanocomposites using epoxy and vinylester blend in which nanoiron filler was dispersed to evaluate the mechanical performance. Different weight ratios viz.1,2,3,4,5 & 7wt.% of nanoiron particles were dispersed into the matrix to prepare different systems to evaluate the optimization of performance. Nanoiron was also prepared by chemical reduction method and nanocomposites were prepared by hand layup process. Three blade Mechanical stirrer and ultra-sonicator was used while preparing the modified to keep the non-homogeneity nanoparticle at bay. Mechanical properties such as hardness, tensile strength, flexural strength, impact strength and compression strength properties were performed. Nanoiron particles functionalization nepotisms the fabrication composites through the remedial temperature at low as associated to the as-synthesised nano particles occupied vinylester nano composites. Mechanical property values improved owing to the standardized nanoparticle chemical bonding and spreading between vinylester matrix and nanoparticles. Then the combination nanoiron particles into the vinylester resin matrix it becomes magnetically harder. Machines generated mechanical property values were compared and analysed with system generated software analysis of variance (ANOVA) values. Machine values and ANOVA values were measured for the specimens of epoxy+vinylester+nanoiron, where the nanoiron is varying viz. 1, 2, 3, 4, 5 and 7 wt.%.

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Mechanical Properties Of 3D-Structure Composites Based On Warp-Knitted Spacer Fabrics

Autex Research Journal ◽

10.2478/aut-2014-0045 ◽

2015 ◽

Vol 15 (2) ◽

pp. 127-137 ◽

Cited By ~ 24

Author(s):

Si Chen ◽

Hai-ru Long ◽

Ying-hao Liu ◽

Feng-chao Hu

Keyword(s):

Mechanical Properties ◽

Mechanical Performance ◽

Layer Structure ◽

Structural Parameters ◽

3D Structure ◽

Three Dimension ◽

Different Types ◽

Spacer Fabrics ◽

Flexible Polyurethane ◽

The Impact

Abstract In this paper, the mechanical properties (compression and impact behaviours) of three-dimension structure (3D-structure) composites based on warp-knitted spacer fabrics have been thoroughly investigated. In order to discuss the effect of fabric structural parameters on the mechanical performance of composites, six different types of warp-knitted spacer fabrics having different structural parameters (such as outer layer structure, diameter of spacer yarn, spacer yarn inclination angle and thickness) were involved for comparison study. The 3D-structure composites were fabricated based on a flexible polyurethane foam. The produced composites were characterised for compression and impact properties. The findings obtained indicate that the fabric structural parameters have strong influence on the compression and impact responses of 3D-structure composites. Additionally, the impact test carried out on the 3D-structure composites shows that the impact loads do not affect the integrity of composite structure. All the results reveal that the product exhibits promising mechanical performance and its service life can be sustained.

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Evaluation of mechanical properties of Ti-25Nb BCC porous cell structure and their association with structure porosity: A combined finite element analysis and analytical approach for orthopedic application

Proceedings of the Institution of Mechanical Engineers Part H Journal of Engineering in Medicine ◽

10.1177/09544119211011309 ◽

2021 ◽

pp. 095441192110113

Author(s):

Soham Chowdhury ◽

Amit Anand ◽

Adhish Singh ◽

Bidyut Pal

Keyword(s):

Mechanical Properties ◽

Finite Element Analysis ◽

Finite Element ◽

Mechanical Performance ◽

Bone Ingrowth ◽

Structural Parameters ◽

Cell Structure ◽

Porous Structures ◽

Element Analysis ◽

Functional Relationships

Ti-based alloys have been commonly employed in manufacturing implants for orthopedic applications. Binary Titanium-Niobium (Ti-25Nb) alloy is a promising material for potential applications in orthopedics because of their lower elastic moduli and superior biocompatibility than the conventional Ti-based alloys. Implants with porous structures encourage bone ingrowth and reduce the effect of stress-shielding further. This study is aimed at establishing the relationship between the mechanical performance and structural parameters of porous body-centered-cubic (BCC) structures made up of Ti-25Nb (25% by wt.). Solid models of BCC porous structures were constructed (unit cell size: 2 mm; overall size: 8 × 8 × 8 mm3). Finite element analysis (FEA) of the BCC structures with porosity ranging from 29% to 79% (seven porosities) was conducted under tension, bending, and torsional loads. The Gibson-Ashby model and Exponential regression model were also employed to determine the stiffness of the above porous structures. The functional relationships between effective Young’s modulus, effective yield strength, and porosity generated from both the models were found to match the FEA results well. Results indicated that porosity in the range of 50%−70% can be used to design graded porous stems to mimic the mechanical properties of cortical bone.

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Effect of nickel on formation of transition layer during liquid-phase aluminizing of titanium

10.36652/1813-1336-2020-16-7-313-317 ◽

2020 ◽

pp. 313-317

Author(s):

A.I. Kovtunov ◽

Yu.Yu. Khokhlov ◽

S.V. Myamin

Keyword(s):

Mechanical Properties ◽

Liquid Phase ◽

Intermetallic Layer ◽

Reaction Diffusion ◽

Strength Properties ◽

Effect Of Temperature ◽

Nickel Concentration ◽

Aluminum Melt ◽

Titanium Aluminum ◽

Titanium Foam

Titanium—aluminum, titanium—foam aluminum composites and bimetals obtained by liquid-phase methods, are increasingly used in industry. At the liquid-phase methods as result of the reaction diffusion of titanium and aluminum is formed transitional intermetallic layer at the phase boundary of the composite, which reduces the mechanical properties of titanium and composite. To reduce the growth rate of the intermetallic layer between the layers of the composite and increase its mechanical properties, it is proposed to alloy aluminum melt with nickel. The studies of the interaction of titanium and molten aluminum alloyed with nickel made it possible to establish the effect of temperature and aluminizing time on the thickness, chemical and phase compositions of the transition intermetallic layer. The tests showed the effect of the temperature of the aluminum melt, the nickel concentration on the strength properties of titanium—aluminum bimetal.

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Weldability - Behavior of Welded Reinforcement

Revista de Chimie ◽

10.37358/rc.19.10.3469 ◽

2019 ◽

Vol 70 (10) ◽

pp. 3469-3472

Keyword(s):

Mechanical Properties ◽

Chemical Composition ◽

Mechanical Characteristics ◽

Mechanical Performance ◽

Current Work ◽

Carbon Equivalent ◽

Work Process ◽

Ultimate Limit

Weldability involves two aspects: welding behavior of components and safety in operation. The two aspects will be reduced to the mechanical characteristics of the elements and to the chemical composition. In the case of steel reinforcing rebar’s, it is reduces to the percentage of Cech(carbon equivalent) and to the mechanical characteristics: the yielding limit, the ultimate limit, and the elongations which after that represent the ductility class in which the re-bars is framed. The paper will present some types of steel reinforcing rebar’s with its mechanical characteristics and the welding behavior of those elements. In the current work, process-related behavior of welded reinforcement, joint local and global mechanical properties, and their correlation with behavior of normal reinforcement and also the mechanical performance resulted in this type of joints. Keywords: welding behavior, ultimate limit, reinforcing rebar’s

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Preparation of Long Sisal Fiber-Reinforced Polylactic Acid Biocomposites with Highly Improved Mechanical Performance

Polymers ◽

10.3390/polym13071124 ◽

2021 ◽

Vol 13 (7) ◽

pp. 1124

Author(s):

Zhifang Liang ◽

Hongwu Wu ◽

Ruipu Liu ◽

Caiquan Wu

Keyword(s):

Mechanical Properties ◽

Polylactic Acid ◽

Mechanical Performance ◽

Tensile Elongation ◽

Sisal Fiber ◽

Fiber Reinforced ◽

Impact Performance ◽

The Matrix ◽

Blending Process ◽

Extension Direction

Green biodegradable plastics have come into focus as an alternative to restricted plastic products. In this paper, continuous long sisal fiber (SF)/polylactic acid (PLA) premixes were prepared by an extrusion-rolling blending process, and then unidirectional continuous long sisal fiber-reinforced PLA composites (LSFCs) were prepared by compression molding to explore the effect of long fiber on the mechanical properties of sisal fiber-reinforced composites. As a comparison, random short sisal fiber-reinforced PLA composites (SSFCs) were prepared by open milling and molding. The experimental results show that continuous long sisal fiber/PLA premixes could be successfully obtained from this pre-blending process. It was found that the presence of long sisal fibers could greatly improve the tensile strength of LSFC material along the fiber extension direction and slightly increase its tensile elongation. Continuous long fibers in LSFCs could greatly participate in supporting the load applied to the composite material. However, when comparing the mechanical properties of the two composite materials, the poor compatibility between the fiber and the matrix made fiber’s reinforcement effect not well reflected in SSFCs. Similarly, the flexural performance and impact performance of LSFCs had been improved considerably versus SSFCs.

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Comparative Analysis of Shear Strength Parallel to Fiber of Different Local Bamboo Species in the Philippines

Sustainability ◽

10.3390/su13158164 ◽

2021 ◽

Vol 13 (15) ◽

pp. 8164

Author(s):

Brian E. Bautista ◽

Lessandro E. O. Garciano ◽

Luis F. Lopez

Keyword(s):

Mechanical Properties ◽

Shear Strength ◽

Comparative Analysis ◽

Strength Properties ◽

The Philippines ◽

Bamboo Species ◽

Test Protocol ◽

Future Design ◽

Average Shear Strength ◽

Bambusa Vulgaris

There are limited published studies related to the mechanical properties of bamboo species in the Philippines. In this study, the shear strength properties of some economically viable bamboo species in the Philippines were properly characterized based on 220 shear test results. The rationales of selecting this mechanical property are the following: (1) Shear strength, parallel to the fiber, has the highest variability among the mechanical properties; and (2) Shear is one of the governing forces on joint connections, and such connections are the points of failure on bamboo structures when subjected to extreme loading conditions. ISO 22157-1 (2017) test protocol for shear was used for all tests. The results showed that Bambusa blumeana has the highest average shear strength, followed by Gigantochloa apus, Dendrocalamus asper, Bambusa philippinensis, and Bambusa vulgaris. However, comparative analysis, using One-way ANOVA, showed that shear strength values among these bamboo species have significant differences statistically. A linear regression model is also established to estimate the shear strength of bamboo from the physical properties. Characteristic shear strength is also determined using ISO 12122-1 (2014) for future design reference.

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Tribological and Mechanical Properties of Multicomponent CrVTiNbZr(N) Coatings

Coatings ◽

10.3390/coatings11010041 ◽

2021 ◽

Vol 11 (1) ◽

pp. 41

Author(s):

Yin-Yu Chang ◽

Cheng-Hsi Chung

Keyword(s):

Mechanical Properties ◽

Nitrogen Content ◽

Adhesion Strength ◽

Mechanical Performance ◽

Bulk Material ◽

High Entropy Alloy ◽

Composition Gradient ◽

Multilayered Structures ◽

High Entropy ◽

Alloy Target

Multi-element material coating systems have received much attention for improving the mechanical performance in industry. However, they are still focused on ternary systems and seldom beyond quaternary ones. High entropy alloy (HEA) bulk material and thin films are systems that are each comprised of at least five principal metal elements in equally matched proportions, and some of them are found possessing much higher strength than traditional alloys. In this study, CrVTiNbZr high entropy alloy and nitrogen contained CrVTiNbZr(N) nitride coatings were synthesized using high ionization cathodic-arc deposition. A chromium-vanadium alloy target, a titanium-niobium alloy target and a pure zirconium target were used for the deposition. By controlling the nitrogen content and cathode current, the CrNbTiVZr(N) coating with gradient or multilayered composition control possessed different microstructures and mechanical properties. The effect of the nitrogen content on the chemical composition, microstructure and mechanical properties of the CrVTiNbZr(N) coatings was investigated. Compact columnar microstructure was obtained for the synthesized CrVTiNbZr(N) coatings. The CrVTiNbZrN coating (HEAN-N165), which was deposited with nitrogen flow rate of 165 standard cubic centimeters per minute (sccm), exhibited slightly blurred columnar and multilayered structures containing CrVN, TiNbN and ZrN. The design of multilayered CrVTiNbZrN coatings showed good adhesion strength. Improvement of adhesion strength was obtained with composition-gradient interlayers. The CrVTiNbZrN coating with nitrogen content higher than 50 at.% possessed the highest hardness (25.2 GPa) and the resistance to plastic deformation H3/E*2 (0.2 GPa) value, and therefore the lowest wear rate was obtained because of high abrasion wear resistance.

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