ON INVESTIGATION OF TENSILE STRENGTH OF COMMERCIAL SYNTHETIC NON-ABSORBABLE SUTURE MADE FROM OF BLUE POLYPROPYLENE MONOFILAMENT

Objective: The purpose of this research is to investigate the tensile strength of commercial synthetic non-absorbable suture made from blue polypropylene monofilament that commonly used in surgery.Methods: The commercial synthetic non-absorbable made from blue polypropylene monofilament was prepared for this purpose. The ASTM C1557-03 was used as a standard the method for analysis. For accuracy of the measurement, the diameter of the sutures was measured using optical microscope. The tensile strength, strain at failure, and modulus elasticity of the sutures were measured following instruction from the standard test method. The graph strain versus stress was provided.Results: Results show that that the average tensile strength of five valid tested samples is about 875.812 MPa. The average strain is found about 0.282. The average of modulus of elasticity is 4026.069 MPa.Conclusion: It is concluded that the sutures of commercial synthetic non-absorbable suture made from blue polypropylene monofilament having linier elastic as well as plastic properties. The average tensile strength of five valid tested samples is about 875.812 MPa. The average strain at failure is found about 0.282. The average of modulus of elasticity is 4026.069 MPa.

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COMPARISON TENSILE STRENGTH OF NATURAL AND SYNTHETIC ABSORBABLE SUTURES

International Journal of Applied Pharmaceutics ◽

10.22159/ijap.2019.v11s5.t1011 ◽

2019 ◽

pp. 157-159

Author(s):

TJOKORDA GDE TIRTA NINDHIA ◽

PUTU ASTAWA ◽

TJOKORDA SARI NINDHIA ◽

WAYAN SURATA I

Keyword(s):

Tensile Strength ◽

Optical Microscope ◽

Standard Test ◽

Chromic Catgut ◽

Test Method ◽

Natural Material ◽

Synthetic Material ◽

Absorbable Sutures ◽

Surface Irregularities ◽

Natural And Synthetic

Objective: The aim of the investigation is to evaluate and to compare the tensile strength of commercial natural and synthetic absorbable suturematerials currently used in surgery. The natural absorbable sutures of chromic catgut are prepared for this purpose as well as commercial syntheticabsorbable sutures made from polyglycolide.Methods: The analysis has been carried out following the standard test method for tensile strength and Young’s modulus of fiber ASTM C1557-03.Measuring the diameter of each suture has been carried out with an optical microscope to determine the accuracy of manufacturers’ data. Tensiletesting has been performed to evaluate the tensile strength of each type of sutures. The modulus elasticity and strain (ϵ) obtained are also presented.Results: The results show that sutures made from braided synthetic material of polyglycolide (violet coated) present a tensile strength remarkablysuperior (1070.292 MPa) to that of natural absorbable sutures of chromic catgut (392.276 MPa). Using optical macro microscope analysis,monofilament sutures present less surface irregularities than multifilament polyglycolide sutures. Chromic catgut monofilament sutures present lesssurface irregularities than multifilament polyglycolide.Conclusion: Tensile test of absorbable sutures was conducted in this research. Two types of absorbable sutures were investigated and compared. It isfound that sutures made from braided synthetic material of polyglycolide (violet coated) having much better tensile strength comparing with suturesmade from natural material (chromic catgut monofilament).

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Microstructural Fractal Dimension of AISI 316L Steel

MRS Proceedings ◽

10.1557/proc-367-125 ◽

1994 ◽

Vol 367 ◽

Author(s):

M. Hinojosa ◽

R. Rodréguez ◽

U. Ortiz

Keyword(s):

Fractal Dimension ◽

Grain Boundary ◽

Grain Boundaries ◽

Tensile Strain ◽

Optical Microscope ◽

Standard Test ◽

Test Method ◽

Aisi 316L ◽

316L Steel ◽

Deformation Processes

AbstractFractal dimension of the microstructure of AISI 316L steel (17 Cr, 12.7 Ni, 2.1 Mo, 1. 5 Mn, 0.01 C) with different degrees of strain were obtained from Richardson plots of grain boundary perimeter against magnification. Grain boundaries were revealed using conventional metallographic techniques and measurements were taken with the aid of an automatic image analizer (Quantimet 520) attached to an optical microscope. The magnifications used were 50, 100, 200, 400, and 1000X. The samples were obtained from a 4” diameter tubing, machined according to ASTM A370 standard test method and deformed to 5, 10, 15, and 20 % tensile strain. The results show that the fractal dimension of the grain boundaries changes as deformation is imparted to the material.These results suggest that fractal dimension may be used to describe microstructural evolution of metals during deformation processes.

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An Innovative Test Method for Tensile Strength of Concrete by Applying the Strut-and-Tie Methodology

Materials ◽

10.3390/ma13122776 ◽

2020 ◽

Vol 13 (12) ◽

pp. 2776 ◽

Cited By ~ 1

Author(s):

Wen-Cheng Liao ◽

Po-Shao Chen ◽

Chung-Wen Hung ◽

Suyash Kishor Wagh

Keyword(s):

Tensile Strength ◽

Test Methods ◽

Standard Test ◽

Strength Test ◽

Tension Test ◽

Test Method ◽

Direct Tension ◽

Direct Tension Test ◽

Strut And Tie ◽

Tensile Strength Test

Tensile strength is one of the important mechanical properties of concrete, but it is difficult to measure accurately due to the brittle nature of concrete in tension. The three widely used test methods for measuring the tensile strength of concrete each have their shortcomings: the direct tension test equipment is not easy to set up, particularly for alignment, and there are no standard test specifications; the tensile strengths obtained from the test method of splitting tensile strength (American Society for Testing and Materials, ASTM C496) and that of flexural strength of concrete (ASTM C78) are significantly different from the actual tensile strength owing to mechanisms of methodologies and test setup. The objective of this research is to develop a new concrete tensile strength test method that is easy to conduct and the result is close to the direct tension strength. By applying the strut-and-tie concept and modifying the experimental design of the ASTM C78, a new concrete tensile strength test method is proposed. The test results show that the concrete tensile strength obtained by this proposed method is close to the value obtained from the direct tension test for concrete with compressive strengths from 25 to 55 MPa. It shows that this innovative test method, which is precise and easy to conduct, can be an effective alternative for tensile strength of concrete.

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The influence of an applied standard test method on a measurement of concrete stabilized secant modulus of elasticity

MATEC Web of Conferences ◽

10.1051/matecconf/201816307001 ◽

2018 ◽

Vol 163 ◽

pp. 07001

Author(s):

Lucyna Domagała ◽

Justyna Dobrowolska

Keyword(s):

Modulus Of Elasticity ◽

Lightweight Aggregate ◽

Standard Test ◽

Normal Weight ◽

Test Method ◽

Hardened Concrete ◽

Secant Modulus ◽

Testing Procedures ◽

Standard Test Method ◽

The Difference

The paper focuses on the influence of the standard test method applied to determine the concrete stabilized secant modulus on a specified value. The new European Standard EN 12390-13 for testing hardened concrete accepts two methods (A and B) for the determination of the secant modulus of elasticity in compression. The aim of the research was to establish how different testing procedures affect a measured value of modulus of elasticity. Four structural concrete series: two lightweight aggregate concretes and two normal-weight ones were subject to tests of moduli of elasticity determined by both standard methods, as well as compressive strength and density. The carried out tests revealed that the procedure of testing modulus of elasticity influenced a measured value. Method A led to higher values of modulus in relation to Method B, irrespective of concrete density and strength. Nevertheless, a certain relationship between the concrete structure homogeneity and the difference in results of moduli determined by both methods may be observed.

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Macro-Observation of the Interface of the Al-22%Si-Cu/Al-7%Si-MG Bi-Metal Parts Fabricated by Thixoforging

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.256.69 ◽

2016 ◽

Vol 256 ◽

pp. 69-74

Author(s):

Zhao Yang ◽

Guang Xu Wang ◽

Xue Xuan Xu ◽

Xiao Long He ◽

Jian Ning Lu

Keyword(s):

Heat Treatment ◽

Tensile Strength ◽

Large Scale ◽

Optical Microscope ◽

Flaw Detector ◽

X Ray ◽

Volume Stability ◽

Metal Parts ◽

T6 Heat Treatment ◽

Average Tensile Strength

Thixo-forging has been proved to be able to fabricate bi-metal parts with a complex outline and a relatively regular interface economically. These products have potential applications on high volume stability radiators, brakes, and pistons. However, it is very difficult to evaluate the curved interfaces by micro observations. In this work, Al-22%Si-Cu/Al-7%Si-Mg bi-metal parts were fabricated by thixo-forging; state of the interfaces of the bi-metal parts was investigated by X-ray flaw detector observations and tensile test; optical microscope (OM) observation and scan electron microscope (SEM) observation were applied to assist the analysis. The results show that the metallurgical bonding of the interfaces is of good quality. No large scale flaw was found on the interface in X-ray flaw detector observation. It was found that higher forging pressure decreased the size of the crack on the interface and in the matrix. However, higher forging pressure can slightly improve tensile strength. Large ratio of fresh interface relates to original interface resulted in a slightly better tensile strength. Without heat-treatment, the bi-metal forgings have an average tensile strength of 106 MPa. T6 heat treatment blunted the blades of the plate like crack and nodulized the defects, T6 heat treatment also decreased the size of the Si particles. As a result, the average tensile strength of the bi-metal forgings increased to 200 MPa.

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