Constrained Amorphous Interphase in Poly(l-lactic acid): Estimation of the Tensile Elastic Modulus

The phase transformation characteristics, the dynamic elastic modulus and the static tensile elastic modulus of Ti50Ni47.5Fe2.5 alloy were investigated. It is found that, the two mutations in the dynamic elastic modulus is caused by reverse martensite phase transformation and austenite phase transformation respectively; Static tensile test can not reflect the intrinsic elastic modulus when the test temperature is close to martensite transformation temperature(Ms). The static elastic modulus and the dynamic elastic modulus have the same trend when the test temperature is enough higher than Ms.

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Comparative Study on the Test Method for Tensile Elastic Modulus of Rock Materials

Advances in Civil Engineering ◽

10.1155/2019/3161953 ◽

2019 ◽

Vol 2019 ◽

pp. 1-18

Author(s):

Yan Zhang ◽

Dawei Yu

Keyword(s):

Elastic Modulus ◽

Comparative Investigation ◽

Test Method ◽

Bending Test ◽

Brazilian Disc ◽

Rock Materials ◽

Brazilian Disc Test ◽

Test Operation ◽

Uniaxial Compressive Test ◽

Tensile Elastic Modulus

Rock material has different mechanical behaviors under compressive and tensile loading. Correspondingly, there are two types of elastic modulus: compressive elastic modulus Ec and tensile elastic modulus Et, respectively. To distinguish which indirect test methodology, including three-points bending test and Brazilian disc test, is more suitable to measure the tensile elastic modulus Et of rock materials, a series of uniaxial compressive test (UCT), direct tensile test (DTT), three-points bending test, and Brazilian disc test are performed for three typical types of rock: marble, granite, and sandstone. Comparative investigation on the reliability of measurement results of tensile elastic modulus Et is systematically conducted. Finally, it is found that Brazilian disc test could be a suitable method to measure tensile elastic modulus of rock materials, due to the excellent agreement with that measured by DTT and the simplicity of sample preparation, as well as test operation.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.598.388 ◽

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.

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Mechanical and Morphological Behavior of Blends Obtained from Biopolymers (PLA/PLC)

Materials Science Forum ◽

10.4028/www.scientific.net/msf.775-776.24 ◽

2014 ◽

Vol 775-776 ◽

pp. 24-28

Author(s):

Taciana Regina de Gouveia Silva ◽

Bartira Brandão da Cunha ◽

Pankaj Agrawal ◽

Edcleide Maria Araújo ◽

Tomás Jefférson Alves de Mélo

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Lactic Acid ◽

Elastic Modulus ◽

Impact Strength ◽

Polymer Blends ◽

Poly Lactic Acid ◽

Elongation At Break ◽

Morphology Analysis ◽

Morphological Behavior

In this work, the effect of the PCL content and E-GMA compatibilizer on the mechanical properties and morphology of poly (lactic acid) - PLA/ poly (ε-caprolactone)-PCL blends was investigated. The results of the mechanical properties showed that there was a reduction in the elastic modulus and tensile strength when PCL was added to PLA. The decrease in the modulus was more pronounced when the PCL content was increased from 10 to 20% (wt). The PLA/PCL/E-GMA blend showed the lower modulus and tensile strength. This blend also presented the higher elongation at break and impact strength. The morphology analysis by SEM showed that the PLA/PCL blends where characterized by lack of adhesion between the PLA and PCL phases. The presence of E-GMA in the PLA/PCL/E-GMA blend improved the adhesion between the PLA and PCL phases.Keywords: poly (latic acid); poly (ε-caprolactone); polymer blends; compatibilizer

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

Macromolecules ◽

10.1021/ma00194a035 ◽

1989 ◽

Vol 22 (4) ◽

pp. 1709-1718 ◽

Cited By ~ 165

Author(s):

Buckley Crist ◽

Christopher J. Fisher ◽

Paul R. Howard

Keyword(s):

Mechanical Properties ◽

Elastic Modulus ◽

Yield Stress ◽

Tensile Elastic Modulus

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Effect of Fiber Diameter Waviness and Wavelength Ratio on the Effective Tensile Elastic Modulus of Carbon Nanotube-Based Polymer Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.83-86.473 ◽

2009 ◽

Vol 83-86 ◽

pp. 473-480

Author(s):

A.A. Khaled ◽

A.K.M. Masud ◽

S.C. Chowdhury ◽

S. Jannat ◽

M. Obayedullah

Keyword(s):

Elastic Modulus ◽

Carbon Nanotube ◽

Polymer Composites ◽

Polymer Composite ◽

Volume Fraction ◽

Fiber Diameter ◽

Material Constant ◽

Diameter Variation ◽

Ratio Variation ◽

Tensile Elastic Modulus

In this paper, the effects of nanotube diameter, waviness ratio and wavelength ratio on the tensile elastic modulus (TEM) of the carbon nanotube (CNT) reinforced polymer composites is investigated using a 3-D nanoscale representative volume element (RVE) based on continuum mechanics and using the finite element method (FEM). Formula to extract the effective material constant from solutions for the RVE under axial loading is derived based on the elasticity theory. Both long and short CNT embedded in the matrix are considered for investigating the effect of fiber diameter variation whereas only long wavy CNT is considered for investigating the effect of waviness and wavelength ratio variation, all at a volume fraction of 5%. First, the effects of CNT diameter on the TEM of the composite are investigated. Numerical results show that TEM of the polymer composite is influenced by tube diameter variation for both long and short CNT. Then the effects of waviness ratio and wavelength ratio on the TEM of polymer composite are investigated. Results show that both the waviness and wavelength ratio variation of CNT significantly influence the TEM of the polymer composite.

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