Mechanical properties of model polyethylenes: tensile elastic modulus and yield stress

1989 ◽  
Vol 22 (4) ◽  
pp. 1709-1718 ◽  
Author(s):  
Buckley Crist ◽  
Christopher J. Fisher ◽  
Paul R. Howard
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Tensile Elastic Modulus

Biomimetic composites inspired by venous leaf

2017 ◽  
Vol 52 (3) ◽  
pp. 361-372 ◽  
Author(s):  
Gongdai Liu ◽  
R Ghosh ◽  
A Vaziri ◽  
A Hossieni ◽  
D Mousanezhad ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Poisson’S Ratio ◽  
Composite Structures ◽  
Volume Fraction ◽  
Matrix Material ◽  
Poisson's Ratio ◽  
Fiber Volume ◽  
Young’S Moduli

A typical plant leaf can be idealized as a composite having three principal fibers: the central mid-fiber corresponding to the mid-rib, straight parallel secondary fibers attached to the mid-fiber representing the secondary veins, and then another set of parallel fibers emanating from the secondary fibers mimicking the tertiary fibers embedded in a matrix material. This paper introduces a biomimetic composite design inspired by the morphology of venous leafs and investigates the effects of venation morphologies on the in-plane mechanical properties of the biomimetic composites using finite element method. The mechanical properties such as Young’s moduli, Poisson’s ratio, and yield stress under uniaxial loading of the resultant composite structures was studied and the effect of different fiber architectures on these properties was investigated. To this end, two broad types of architectures were used both having similar central main fiber but differing in either having only secondary fibers or additional tertiary fibers. The fiber and matrix volume fractions were kept constant and a comparative parametric study was carried out by varying the inclination of the secondary fibers. The results show that the elastic modulus of composite in the direction of main fiber increases linearly with increasing the angle of the secondary fibers. Furthermore, the elastic modulus is enhanced if the secondary fibers are closed, which mimics composites with closed cellular fibers. In contrast, the elastic modulus of composites normal to the main fiber ( x direction) exponentially decreases with the increase of the angle of the secondary fibers and it is little affected by having secondary fibers closed. Similar results were obtained for the yield stress of the composites. The results also indicate that Poisson’s ratio linearly increases with the secondary fiber angle. The results also show that for a constant fiber volume fraction, addition of various tertiary fibers may not significantly enhance the mechanical properties of the composites. The mechanical properties of the composites are mainly dominated by the secondary fibers. Finally, a simple model was proposed to predict these behaviors.

Research on Mechanical Properties of C100 High-Strength Concrete Used for Frozen Shaft

2012 ◽  
Vol 598 ◽  
pp. 388-392
Author(s):  
Hong Qiang Chu ◽  
Lin Hua Jiang ◽  
Ning Xu ◽  
Chuan Sheng Xiong
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Fly Ash ◽  
High Strength Concrete ◽  
High Strength ◽  
Cementitious Materials ◽  
Poisson's Ratio ◽  
Strength Concrete ◽  
Tensile Elastic Modulus ◽  
Early Strength

The mechanical properties of C100 high-strength concrete used for frozen shaft were studied in this research. The results demonstrate that: The cementitious materials 570kg/m3 concrete 28 strength is only 104.5MPa, which is lower than the C100 requirements; the early strength (3d) of the concrete doped with 30% admixture is less than 20% admixture concrete, but with the age increase, its strength gradually reaches close to concrete doped with 20% admixture, and eventually exceeds the concrete doped with 20% admixture.The tension-compression of high strength concrete doped with 15% fly ash and 15% slag is the smallest, while the tension-compression of the concrete doped 10% fly ash and 10% slag reaches the maximum.The Poisson's ratio of C100 concrete is between 0.20 and 0.24; the compressive elastic modulus is about 50GPa; and the tensile elastic modulus is about 110GPa.

On the Temperature-Related Mechanical Properties of UV-LIGA Nickel Material

2015 ◽  
Vol 645-646 ◽  
pp. 926-930 ◽  
Author(s):  
Shuang Shi Yuan ◽  
Guang He ◽  
Ming Zhang ◽  
Guo Zhong Li
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Environmental Temperature ◽  
Experimental System ◽  
Failure Stress ◽  
Uniaxial Tensile ◽  
Mechanical Parameters ◽  
Static Mechanical ◽  
The Relationship

MEMS nickel material is commonly used for structural material in micro devices. In order to study the effect of environmental temperature on its mechanical properties,this paper has built up a experimental system which can measure the temperature-related static mechanical parameters of the UV-LIGA nickel material. By using the system for uniaxial tensile experiments of the micro specimen under different temperature, the stress-strain curves of the micro specimen under different temperature were obtained; the mechanical parameters of the micro specimen such as elastic modulus, yield stress and failure stress under different temperature were also calculated out;Finally, the relationship between temperature and mechanical parameters including elastic modulus, yield stress and failure stress was analyzed.

scholarly journals Kearns texture parameters, mechanical properties and damageability of titanium sheet after alternating bending

2021 ◽  
Vol 22 (3) ◽  
pp. 543-550
Author(s):  
V.V. Usov ◽  
N.M. Shkatulyak ◽  
O.S. Savchuk ◽  
N.I. Rybak
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Ultimate Tensile Strength ◽  
Yield Stress ◽  
Rolling Direction ◽  
Initial State ◽  
Texture Parameters ◽  
Experimental Values ◽  
Alternating Bending

This work aims to determine the Kearns texture parameters and evaluate on their basis the elastic moduli, mechanical properties (ultimate tensile strength, conditional yield stress), as well as damageability parameters of the sheets commercial titanium (CT-grade 1: 0.04% Fe; 0.015% C; 0.05% N 0.05% c; 0.009% H)  as delivered after rolling and annealing at 840°C (original sheet) and further alternating bending (AB) in the amount of 0.5; 1, 3 and 5 cycles. Damageability parameters characterizing damage accumulation were determined from the elastic modulus change after the above-mentioned number of AB cycles relative to the values ​​of the elastic modulus in different directions of the original sheet of the studied titanium. The elastic constants of the single crystal and the Kearns texture parameters were used to estimate the elastic modulus in the rolling direction (RD) and transverse direction (TD) of the original sheet, and sheets after an above number of AB cycles. The deviation of the calculated and experimental values ​​of the elastic modulus did not exceed 5%. The deviation of the calculated and experimental values of the ultimate tensile strength and yield stress in the RD and TD both in the initial state and after the corresponding number cycles of the AB did not exceed 10%.

scholarly journals Mechanical characterization of polylactic acid, polycaprolactone and Lay-Fomm 40 parts manufactured by fused deposition modeling, as a function of the printing parameters

2019 ◽  
Vol 16 (2) ◽  
pp. 25-31 ◽  
Author(s):  
Jessica Zuleima Parrado-Agudelo ◽  
Carlos Narváez-Tovar
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Fused Deposition Modeling ◽  
Material Selection ◽  
Ultimate Tensile Stress ◽  
Ultimate Stress ◽  
Fused Deposition ◽  
Raster Angle ◽  
Printing Parameters

This study aims to determine the mechanical properties of parts manufactured by Fused Deposition Modeling (FDM) using three biocompatible polymer materials: Polylactic Acid (PLA), Polycaprolactone (PCL) and Lay-Fomm 40. Also, it was analyzed the influence of different printing parameters, material selection, infill percentage, and raster angle, over the mechanical properties. The samples were subjected to tension and compression tests using a universal testing machine, and elastic modulus, yield stress, and ultimate stress were obtained from the stress-strain curves. PLA samples have the highest elastic modulus, yield stress and ultimate stress for both compression and tension tests, for example, the ultimate tensile stress with infill percentage of 30 % and raster angle of 0-90° has an average value of 41.20 MPa, while PCL samples had an ultimate tensile stress average value of 9.68 MPa. On the other hand, Lay-Fomm40 samples had the highest elongations, with percentage values between 300 and 600 %. Finally, ANOVA analysis showed that the choice of the material is the leading printing parameter that contributes to the mechanical properties, with percentages of 84.20% to elastic modulus, 93.30% to yield stress, and 82.44% to ultimate stress. The second important factor is the raster angle, with higher strengths for the 0-90° when compared to 45-135°. On the other hand, the contribution of the infill percentage to the mechanical properties was no statistically significant. The obtained results could be useful for material selection and 3D printing parameters definition for additive manufacturing of scaffolds, implants, and other structures for biomedical and tissue engineering applications.

scholarly journals Mechanical Properties of Thermoplastic Polymers for Aligner Manufacturing: In Vitro Study

2020 ◽  
Vol 8 (2) ◽  
pp. 47 ◽  
Author(s):  
Francesco Tamburrino ◽  
Vincenzo D’Antò ◽  
Rosaria Bucci ◽  
Giulio Alessandri-Bonetti ◽  
Sandro Barone ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Yield Stress ◽  
Artificial Saliva ◽  
In Vitro Study ◽  
Tensile Tests ◽  
Operating Conditions ◽  
Thermoplastic Polymers ◽  
The Impact

The use of metal-free thermoplastic materials plays a key role in the orthodontic digital workflow due to the increasing demand for clear aligner treatments. Three thermoplastic polymers commonly used to fabricate clear aligners, namely Duran®, Biolon® and Zendura®, were investigated to evaluate the effect of thermoforming (T.), storage in artificial saliva (S.A.S.) and their combination on their mechanical properties. Elastic modulus and yield stress of the specimens were characterized. Each material was characterized for each condition through tensile tests (ISO527-1). The results showed that thermoforming does not lead to a significant decrease in yield stress, except for Zendura® that showed about a 30% decrease. An increase of the elastic modulus of Duran® and Zendura®, instead, was observed after thermoforming. The same increase was noticed for the yield stress of Duran®. For S.A.S. specimens, the elastic modulus generally decreases compared to supplier condition (A.S.) and simply thermoformed material. A decrease of yield stress, instead, is significant for Zendura®. The results demonstrated that the impact of the operating conditions on the mechanical properties can vary according to the specific polymer. To design reliable and effective orthodontic treatments, the materials should be selected after their mechanical properties are characterized in the simulated intraoral environment.

Research on Tensile Mechanical Properties of GFRP Rebar after High Temperature

2011 ◽  
Vol 181-182 ◽  
pp. 349-354 ◽  
Author(s):  
Ya Nan Fu ◽  
Jun Zhao ◽  
Ya Li Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
High Temperature ◽  
Test Section ◽  
Tensile Tests ◽  
Tensile Elastic Modulus ◽  
Temperature Test

By tensile tests on GFRP rebar after high temperature, the change regularity and influent factor are analyzed. The results show that: With the temperature increasing, vitrification, carbonization, decomposition at high temperature test section of the GFRP rebar are aggravating , and their mechanical properties are deteriorating. At the same time, the limited tensile strength and ultimate tensile elastic modulus decreased in different degree.

Prediction of Edgewise Compressive and Side Tensile Elastic Modulus of Core Materials of Ripple Structure Sandwich Composites

2011 ◽  
Vol 117-119 ◽  
pp. 1501-1505
Author(s):  
Jian She Zhang ◽  
Di Hong Li ◽  
Dong Xing Zhang ◽  
Ye Tian ◽  
Hai Ying Xiao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Sandwich Composites ◽  
Ratio Model ◽  
Ripple Structure ◽  
Tensile Elastic Modulus ◽  
Core Materials

Edgewise compressive elastic modulus, side tensile elastic modulus and poisson’s ratio model of ripple structure sandwich composites were built in this paper, and the predictions of these mechanical properties were also conducted.

Effect of Hydrolytic Degradation on Mechanical Properties of PCL

2016 ◽  
Vol 869 ◽  
pp. 342-345 ◽  
Author(s):  
Danyelle Campos França ◽  
Elieber Barros Bezerra ◽  
Dayanne Diniz Souza Morais ◽  
Edcleide Maria Araújo ◽  
Renate Maria Ramos Wellen
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Impact Strength ◽  
Yield Stress ◽  
Morphological Changes ◽  
Hydrolytic Degradation ◽  
Mechanical Tests ◽  
Crystalline Phases ◽  
Elongation At Break ◽  
Maximum Limit

This work investigated the effect of hydrolytic degradation on mechanical properties in tension and impact strength of poly (Ɛ-caprolactone) (PCL). PCL specimens produced by injection processing were submersed in water and exposed at 40°C into a vacuum heater. The specimens were collected from the heater after periods of 15, 30 and 45 days, respectively, followed by mechanical tests. According to the data acquired for Elastic Modulus, specimens exposed for 15 and 45 days presented a decrease of 9.65% and 13.65%; for Yield Stress a decrease of 9.08% and 10.38% was observed at same period of time compared with unexposed specimens. Concerning the Elongation at Break tests unexposed PCL reached the maximum limit of machine without fracturing while exposed specimens had their elongation at break capability decreased. Unexpected results were observed for the specimens exposed for 30 days which presented an increase of 3.43%, 3.12% and 5.88% for Elastic Modulus, Yield Stress and Strength at Break. Impact Strength presented similar trend to that of mechanical properties in tension. It is suggested that these trends are connected with morphological changes which took place in the amorphous and crystalline phases of PCL during hydrolytic degradation.

Experiment Study of BFRP Bars’ Mechanical Properties

2012 ◽  
Vol 174-177 ◽  
pp. 830-833 ◽  
Author(s):  
Bao Rong Huo ◽  
Xiang Dong Zhang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elastic Modulus ◽  
Mechanical Performance ◽  
Steel Wire ◽  
Tensile Tests ◽  
Test Methods ◽  
National Standards ◽  
Steel Cable ◽  
Tensile Elastic Modulus

The testing rule of mechanical properties of material can be established and the mechanical performance can be found by studying the basic mechanical properties of BFRP bars. Using the opressive sleeve anchor developed by the researchers,tensile tests of BFRP bars are carried out according to the national standards of “GFRP bar tensile test methods”.The BFRP bar’s force-deformation curve is linear before the force-deformation relationship is destroyed,therefore,referring to steel wire or steel cable,the BFRP bar’s reliable strength is suggested to be approximately 80% of its ultimate tensile strength. The BFRP bar’s tensile elastic modulus is related to the content of basalt fiber.The tensile elastic modulus increases with the increase of the basalt fiber’s content and the content increases when the BFRP bar’s diameter becomes longer, so the tensile elastic modulus increases with the increase of its diameter. Compared with steel, the BFRP bar is obviously superior in the aspects of tensile strength, corrosion resistance ,etc,therefore to use the BFRP bar in reinforced concrete structures insead of steel is feasible.

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