Investigation of Mechanical Properties of Composite Made from Hemp and Polylactide

2016 ◽  
Vol 721 ◽  
pp. 63-67
Author(s):  
Rūta Stapulionienė ◽  
Saulius Vaitkus ◽  
Sigitas Vėjelis
Keyword(s):  
Mechanical Properties ◽  
Compressive Stress ◽  
Mechanical Characteristics ◽  
Mechanical Tests ◽  
Short Term ◽  
Hemp Fibers

This paper presents the research on the structure, short-term compression and tension of hemp fibers composite. The density of hemp fibers composite varied from ~40 to ~96 kg/m3. The mechanical characteristics of such hemp fibers composite mostly depend on the materials structure and density. By the mechanical tests it was determined that compressive stress of the hemp fibers composite depends on the direction of the load to the specimens face (perpendicular, across and parallel to the direction of formation).

scholarly journals Effect of storage time and chlorhexidine addition on the mechanical properties of glass ionomer cements

2017 ◽  
Vol 16 ◽  
pp. 1-9
Author(s):  
Juliana de Carvalho Machado ◽  
Cristiane Duque ◽  
Josânia Pitzer de Oliveira ◽  
Angela Scarparo Caldo-Teixeira
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Compressive Strength ◽  
Storage Time ◽  
Mechanical Characteristics ◽  
Mechanical Tests ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Strength Tests ◽  
Storage Times

Aims: To evaluate the effect of the chlorhexidine (CHX) incorporation and the storage time on the mechanical properties of glass ionomer cements (GICs). Methods: The following GICs were evaluated: Ketac Molar Easymix (KM), Vidrion R (VR) and Vitromolar (VM), containing or not CHX.  GIC liquid was modified by adding 1.25 % CHX digluconate and then manipulated with the power and placed into the stainless steel cylindrical or bar-shaped molds. GICs specimens were stored into water for 1, 7 and 28 days. After these periods, specimens were submitted to flexural, diametral tensile and compressive strength tests, according to ISO standards. Data from mechanical tests were statistically analyzed using 2-way ANOVA and Tukey tests. Results: Overall, the storage time did not influence any of the mechanical properties of the GICs tested. In contrast, the inclusion of CHX reduced significantly these properties for all GICs tested. KM presented the highest values of compressive strength for all storage times. KM + 1.25% CHX had lower compressive strength results than KM, however, it showed similar results when compared to another GICs without CHX. Conclusions: The presence of chlorhexidine, independent of the storage time, interfered on the mechanical characteristics of GIC.

scholarly journals The mechanical characteristics and performance evaluation of a newly developed silicone airway stent (GINA stent)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hwa Sik Jung ◽  
Ganghee Chae ◽  
Jin Hyoung Kim ◽  
Chui Yong Park ◽  
Soyeoun Lim ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Tissue Formation ◽  
Short Term ◽  
Granulation Tissue Formation ◽  
Airway Stent ◽  
Dumon Stent ◽  
And Performance ◽  
Expansion Force ◽  
Term Performance

AbstractCentral airway obstruction (CAO) can be attributed to several benign or malignant conditions. Although surgery is the preferred therapeutic option for the management of CAO, bronchoscopic treatment can be performed in scenarios where the surgical procedure is not possible. Recent years have witnessed several improvements in the field of bronchoscopic treatment, especially with regard to airway stents. Current research involves new attempts to overcome the existing shortcomings pertaining to the stents (migration, mucostasis, and granulation tissue formation). The authors have recently developed a new silicone airway stent (GINA stent) with an anti-migration design, dynamic structure that enables the reduction of stent cross-sectional area, and radio-opacity. The present study aimed to evaluate the mechanical characteristics and performance of the novel GINA stent using a porcine tracheal stenosis model. In the current study, all the tests involved the comparison of the GINA stent [outer diameter (OD, mm): 14; length (L, mm): 55] with the Dumon stent (OD: 14; L: 50). The mechanical tests were performed using a digital force gauge, in order to determine the anti-migration force, expansion force, and flexibility. The present study evaluated the short-term (3 weeks) performance of the two stents after implantation [GINA (n = 4) vs. Dumon (n = 3)] in the porcine tracheal stenosis model. The results pertaining to the comparison of the mechanical properties of the GINA and Dumon stents are stated as follows: anti-migration force (18.4 vs. 12.8 N, P = 0.008); expansion force (11.9 vs. 14.5 N, P = 0.008); and flexibility (3.1 vs. 4.5 N, P = 0.008). The results pertaining to the comparison of the short-term performance of the GINA and Dumon stents are stated as follows: mucus retention (0/4 vs. 0/3); granulation tissue formation (0/4 vs. 0/3); and migration (1/4 vs. 2/3). The GINA stent displayed better mechanical properties and comparable short-term performance, compared to the Dumon stent.

Nanotechnology and Earth Construction: The Mechanical Properties of Adobe Brick Stabilized by Laponite Nanoparticles

2014 ◽  
Vol 983 ◽  
pp. 63-66
Author(s):  
Francesca Scalisi
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Chemical Analysis ◽  
Flexural Strength ◽  
Mechanical Characteristics ◽  
Cost Effective ◽  
Mechanical Tests ◽  
Earth Construction ◽  
The Earth ◽  
Scanning Electron

The contribution describes the experimental analysis for the improvement of the mechanical properties of samples of earth with the addition of Laponite nanoparticles. Were made two types of samples: the first consisting of soil, sand and water; the second consisting of soil, water, sand and Laponite nanoparticles. The operations performed were: chemical analysis of soil and sand; preparation of samples; Scanning Electron Microscope (SEM) observation of samples for the distribution of the elements, especially the Laponite nanoparticles; testing of compression strength and flexural strength of two types of samples; comparisons of the resulted of the mechanical tests. The improvement of the mechanical characteristics of the earth material using nanotechnology, will increase the use of eco-friendly, non-toxic, cost effective, available materials in architecture.

scholarly journals Relationship between Thermal Diffusivity and Mechanical Properties of Wood

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 632
Author(s):  
Yuri I. Golovin ◽  
Alexander I. Tyurin ◽  
Dmitry Yu. Golovin ◽  
Alexander A. Samodurov ◽  
Sergey M. Matveev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Diffusivity ◽  
Young’S Modulus ◽  
Mechanical Characteristics ◽  
Young's Modulus ◽  
Brinell Hardness ◽  
Mechanical Tests ◽  
Pedunculate Oak ◽  
Young’S Moduli ◽  
Diffusivity Tensor

This paper describes an experimental study of the relationships between thermal diffusivity and mechanical characteristics including Brinell hardness, microhardness, and Young’s modulus of common pine (Pinus sylvestris L.), pedunculate oak (Quercus robur L.), and small-leaf lime (Tilia cordata Mill.) wood. A dependence of Brinell hardness and thermal diffusivity tensor components upon humidity for common pine wood is found. The results of the measurement of Brinell hardness, microhardness, Young’s modulus, and main components of thermal diffusivity tensor for three perpendicular cuts are found to be correlated. It is shown that the mechanical properties correlate better with the ratio of longitude to transversal thermal diffusivity coefficients than with the respective individual absolute values. The mechanical characteristics with the highest correlation with the abovementioned ratio are found to be the ratio of Young’s moduli in longitude and transversal directions. Our technique allows a comparative express assessment of wood mechanical properties by means of a contactless non-destructive measurement of its thermal properties using dynamic thermal imaging instead of laborious and material-consuming destructive mechanical tests.

scholarly journals Newly developed silicone airway stent (GINA stent): Mechanical characteristics and performance evaluation in pigs

2020 ◽  
Author(s):  
Hwa Sik Jung ◽  
Ganghee Chae ◽  
Jin Hyoung Kim ◽  
Soohyun Bae ◽  
Chui Yong Park ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Granulation Tissue ◽  
Mechanical Characteristics ◽  
Tissue Formation ◽  
Short Term ◽  
Granulation Tissue Formation ◽  
Airway Stent ◽  
Dumon Stent ◽  
And Performance ◽  
Expansion Force

ABSTRACTOBJECTIVESCentral airway obstruction (CAO) is caused by various malignant and benign processes. Surgery is a preferred option for CAO, but if not possible, bronchoscopic treatment could be performed. Recently, bronchoscopic treatments have been improved. Particularly in airway stents, new attempts are being made to overcome the existing shortcomings of stents (migration, mucostasis, and granulation tissue formation). We recently developed a new silicone airway stent (GINA stent). The GINA stent has anti-migration design, dynamic structure enabling reduction of stent cross-sectional area, and radiopaqueness. We sought to evaluate mechanical characteristics and performance of our novel GINA stent in a pig tracheal stenosis model.METHODSAll tests were performed by comparing GINA stent [outer diameter (OD, mm) 14, length (L, mm) 55] with Dumon stent (OD14L50). Mechanical tests were done using digital force gage to determine the anti-migration force, expansion force, and flexibility. Short-term (3 weeks) performance was evaluated after stent implantations [GINA (n = 4) vs. Dumon (n = 3)] in a pig model of tracheal stenosis.RESULTSMechanical properties outcomes for GINA vs. Dumon: anti-migration force [18.4 vs. 12.8 Newton (N)]; expansion force (11.9 vs. 14.5 N); flexibility (3.1 vs. 4.5 N). Short-term (3 weeks) GINA vs. Dumon performances: mucus retention (0/4 vs. 0/3); granulation tissue formation (0/4 vs. 0/3); migration (1/4 vs. 2/3).CONCLUSIONSGINA stent demonstrated better mechanical properties than Dumon stent with a stent performance not inferior to Dumon stent.

Research of Mechanical Properties of Cold Resistant Steel 09CrNi2MoCu after Direct Laser Deposition

2019 ◽  
Vol 822 ◽  
pp. 418-424 ◽  
Author(s):  
Y.A. Bistrova ◽  
E.A. Shirokina ◽  
R.V. Mendagaliev ◽  
M.O. Gushchina ◽  
A. Unt
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Fractional Composition ◽  
Mechanical Tests ◽  
Impact Testing ◽  
Laser Deposition ◽  
Resistant Steel ◽  
Direct Laser Deposition ◽  
Steel Material ◽  
Direct Laser

Review focuses on describing of mechanical properties of the components manufactured via direct laser depositionfrom cold resistant steel material. The results of tensile and impact testing are presented and microstructures of the fractures are shown. The process of laser deposition of cold-resistant steels, the formation of structures, as well as the mechanical properties of these samples are poorly understood. The results of tensile and impact tests are presented, and microstructures are shown. Mechanical tests for impact strength were carried out at a temperature of -40˚С, with different laser radiation powers. The results are given using the as-received powder, as well as used powder with a different mixing ratio, and the results are analyzed. As a result of the study, it was found that the fractional composition of the 09XH2MD alloy powder affects the mechanical characteristics of samples obtained by direct laser deposition. The effect of recycled powder on the mechanical properties of the obtained samples is given, the optimal laser deposition regimes are selected

scholarly journals Mechanical properties of composite material laminates reinforced by woven and non-woven glass fibers

2020 ◽  
Vol 175 ◽  
pp. 12005 ◽  
Author(s):  
Amer Karnoub ◽  
Hajian Huang ◽  
Imad Antypas
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Glass Fiber ◽  
Mechanical Characteristics ◽  
Polyester Resin ◽  
Mechanical Performance ◽  
Glass Fibers ◽  
Mechanical Tests ◽  
Impact Behavior ◽  
The Impact

The purpose of this work is to study the mechanical characteristics in 3-point bending and in traction; static; and the impact behavior of three specimens of laminates made of glass fiber and polyester resin non-woven and woven, with the aim of using them in the repair of boat hulls and enhancing their value in the naval industry. Three types of laminates were developed by contact molding. These different specimens of laminates made of woven, non-woven and combined glass fiber (woven and non-woven) were subjected to mechanical tests (traction and 3-point bending). Analysis of the results of the tests carried out on these three types of laminate shows that one specimen stands out and gives higher mechanical performance than the othertwo.

scholarly journals Change of Mechanical Properties of Polyethylene Film Materials during Their Modification by Technological Applications and during Aging

2020 ◽  
Vol 21 (3) ◽  
pp. 510-518
Author(s):  
N. I. Domantsevich ◽  
B. P. Yatsushyn
Keyword(s):  
Mechanical Properties ◽  
Mechanical Characteristics ◽  
Raw Materials ◽  
Electronic Devices ◽  
Polymeric Materials ◽  
Mechanical Tests ◽  
External Factors ◽  
Polyethylene Film ◽  
Materials Used ◽  
The Relationship

Mechanical tests and studies of the structure of modified polyethylene film materials used as packaging elements of electronic devices have been carried out. The modification provided for the introduction of fillers of various types and technological additives that would facilitate the processing of raw materials and ensure a long service life. The peculiarities of changes in mechanical characteristics depending on the number and type of applications, as well as the course of processes under the influence of external factors are established. The relationship between changes in the structure and mechanical properties of polymeric materials is shown.

Effect of silver nitrate on some mechanical properties of heat polymerizing acrylic resins

2019 ◽  
Vol 14 (1) ◽  
pp. 110
Author(s):  
Assiss. Prof. Dr. Sabiha Mahdi Mahdi ◽  
Dr. Firas Abd K. Abd K.
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Silver Nitrate ◽  
Surface Hardness ◽  
Mechanical Tests ◽  
Hardness Tester ◽  
Acrylic Resins ◽  
The Difference

Aim: The aimed study was to evaluate the influence of silver nitrate on surfacehardness and tensile strength of acrylic resins.Materials and methods: A total of 60 specimens were made from heat polymerizingresins. Two mechanical tests were utilized (surface hardness and tensile strength)and 4 experimental groups according to the concentration of silver nitrate used.The specimens without the use of silver nitrate were considered as control. Fortensile strength, all specimens were subjected to force till fracture. For surfacehardness, the specimens were tested via a durometer hardness tester. Allspecimens data were analyzed via ANOVA and Tukey tests.Results: The addition of silver nitrate to acrylic resins reduced significantly thetensile strength. Statistically, highly significant differences were found among allgroups (P≤0.001). Also, the difference between control and experimental groupswas highly significant (P≤0.001). For surface hardness, the silver nitrate improvedthe surface hardness of acrylics. Highly significant differences were statisticallyobserved between control and 900 ppm group (P≤0.001); and among all groups(P≤0.001)with exception that no significant differences between control and150ppm; and between 150ppm and 900ppm groups(P>0.05).Conclusion: The addition of silver nitrate to acrylics reduced significantly the tensilestrength and improved slightly the surface hardness.

The Mechanical Properties of Organic Modified Epoxy Resin

2020 ◽  
Vol 43 (3) ◽  
pp. 10-14
Author(s):  
Georgel MIHU ◽  
Claudia Veronica UNGUREANU ◽  
Vasile BRIA ◽  
Marina BUNEA ◽  
Rodica CHIHAI PEȚU ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Epoxy Resin ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Mechanical Tests ◽  
Organic Modification ◽  
Three Point Bending ◽  
Modified Epoxy

Epoxy resins have been presenting a lot of scientific and technical interests and organic modified epoxy resins have recently receiving a great deal of attention. For obtaining the composite materials with good mechanical proprieties, a large variety of organic modification agents were used. For this study gluten and gelatin had been used as modifying agents thinking that their dispersion inside the polymer could increase the polymer biocompatibility. Equal amounts of the proteins were milled together and the obtained compound was used to form 1 to 5% weight ratios organic agents modified epoxy materials. To highlight the effect of these proteins in epoxy matrix mechanical tests as three-point bending and compression were performed.

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