scholarly journals Young’s modulus and Poisson ratio of composite materials: Influence of wet and dry storage

2020 ◽  
Vol 39 (4) ◽  
pp. 657-663
Author(s):  
Ana Lúcia LOURENÇO ◽  
Niek De JAGER ◽  
Catina PROCHNOW ◽  
Danilo Antonio MILBRANDT DUTRA ◽  
Cornelis J. KLEVERLAAN
Keyword(s):  
Composite Materials ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Poisson Ratio ◽  
Dry Storage

Elastic constants of inflated lobes of dog lungs

1976 ◽  
Vol 40 (4) ◽  
pp. 508-513 ◽  
Author(s):  
S. J. Lai-Fook ◽  
T. A. Wilson ◽  
R. E. Hyatt ◽  
J. R. Rodarte
Keyword(s):  
Bulk Modulus ◽  
Young’S Modulus ◽  
Elastic Constants ◽  
Young's Modulus ◽  
Poisson Ratio ◽  
Inflation Pressure ◽  
Initial State ◽  
Volume Curve ◽  
Pressure Volume Curve ◽  
Indentation Tests

The elastic constants of dog lungs were determined at various degrees of inflation. In one set of experiments, the lobes were subjected to deformations that approximated the conditions of uniaxial loading. These data, together with the bulk modulus data obtained from the local slope of the pressure-volume curve, were used to determine the two elastic moduli that are needed to describe small nonuniform deformations about an initial state of uniform inflation. The bulk modulus was approximately 4 times the inflation pressure, and Young's modulus was approximately 1.5 times the inflation pressure. In a second set of experiments, lobes were subjected to indentation tests using cylindric punches 1–3 cm in diameter. The value for Young's modulus obtained from these data was slightly higher, approximately twice the inflation pressure. These experiments indicate that the lung is much more easily deformable in shear than in dilatation and that the Poisson ratio for the lung is high, approximately 0.43.

scholarly journals Determination of Young's Modulus and Poisson Ratio of Lump Ores

1983 ◽  
Vol 69 (7) ◽  
pp. 739-745 ◽  
Author(s):  
Minoru ASADA ◽  
Yasuo OMORI
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Poisson Ratio

Determination of Mechanical Properties of Thin Film on Silicon Wafer

2003 ◽  
Author(s):  
Enboa Wu ◽  
Albert J. D. Yang ◽  
Ching-An Shao ◽  
C. S. Yen
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Thermal Expansion ◽  
Young’S Modulus ◽  
Silicon Wafer ◽  
Coefficient Of Thermal Expansion ◽  
Young's Modulus ◽  
Poisson Ratio ◽  
Bulk State

Nondestructive determination of Young’s modulus, coefficient of thermal expansion, Poisson ratio, and thickness of a thin film has long been a difficult but important issue as the film of micrometer order thick might behave differently from that in the bulk state. In this paper, we have successfully demonstrated the capability of determining all these four parameters at one time. This novel method includes use of the digital phase-shifting reflection moire´ (DPRM) technique to record the slope of wafer warpage under temperature drop condition. In the experiment, 1-um thick aluminum was sputtered on a 6-in silicon wafer. The convolution relationship between the measured data and the mechanical properties was constructed numerically using the conventional 3D finite element code. The genetic algorithm (GA) was adopted as the searching tool for search of the optimal mechanical properties of the film. It was found that the determined data for Young’s modulus (E), Coefficient of Thermal Expansion (CTE), Poisson ratio (ν), and thickness (h) of the 1.00 um thick aluminum film were 104.2Gpa, 38.0 ppm/°C, 0.38, and 0.98 um, respectively, whereas that in the bulk state were measured to be E=71.4 Gpa, CTE=23.0 ppm/°C, and ν=0.34. The significantly larger values on the Young’s modulus and the coefficient of thermal expansion determined by this method might be attributed to the smaller dislocation density due to the thin dimension and formation of the 5-nm layer of Al2O3 formed on top of the 1-um thick sputtered film. The Young’s Modulus and the Poisson ratio of this nano-scale Al2O3 film were then determined. Their values are consistent with the physical intuition of the microstructure.

Study the Strength of Material and Composite Structures of Belly-Landing Mini UAV

2016 ◽  
Vol 842 ◽  
pp. 178-185 ◽  
Author(s):  
Maria Fransisca Soetanto ◽  
Rachmad Imbang Tritjahjono
Keyword(s):  
Tensile Strength ◽  
Composite Materials ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Von Mises Stress ◽  
Uniaxial Tensile ◽  
Specific Strength ◽  
Specific Stiffness ◽  
Von Mises ◽  
Material Composite

This paper consists of the design and analysis of the strength of material composite of the fuselage of a Belly-Landing Mini Unmanned Aerial Vehicle (UAV). A belly landing UAV occurs when an UAV lands without its landing gear and uses its underside, or belly, as its primary landing device. Belly landings carry the risk that the UAV may flip over, disintegrate, or catch fire if it lands too fast or too hard [1], so the more important designs parameters for materials used are the specific strength and specific stiffness. Specific strength is defined as the ultimate tensile strength divided by material density, and specific stiffness is defined as Young’s modulus of the material divided by density [Franklin, 2010]. The aim of this Belly Landing Mini UAV is for used in situations where manned flight is considered too risky or difficult and no runway for take-off or landing, such as fire fighting surveillance, while the term 'mini’ means the design of this UAV has a launch mass greater than 100 grams but less than 100 kilograms [2], the objective of this project is the development and design of materials fuselage of a mini UAV with two layer sandwich structures made from composite materials and epoxy resin. For that purposes, 3 variations of the composite materials tensile test specimens have been manufactured in accordance with ASTM D3039 standard and tested its strength. The results showed that the fibre glass and fibre carbon composite with resin epoxy has the maximum tensile strength and Young’s modulus, so that the fabrication and manufacturing of the fuselage component is made by using that material composite. The Von Mises stress is used to predict yielding of materials under any loading condition from results of simple uniaxial tensile tests by using software Autodesk Inventor 2012. The results show that the design is safe caused the strength of material is greater than the maximum value of Von Mises stress induced in the material. The results of flight tests show that this small UAV has successfully manoeuvred to fly, such as take off, some acrobatics when cruising and landing smoothly, which means that the calculation and analysis of structure and material used on the fuselage of the Mini UAV was able to be validated.

Stiffness and Thermal Conductivity of Carbon Nanotube Containing Aluminum

2007 ◽  
Vol 353-358 ◽  
pp. 587-590 ◽  
Author(s):  
Katsuhiko Sasaki ◽  
Terumitsu Imanishi ◽  
Kazuaki Katagiri ◽  
Atushi Kakitsuji ◽  
Toyohiro Satoh ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Composite Materials ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Thermal Characteristic ◽  
Aluminum Composite ◽  
Activated Sintering ◽  
Plasma Activated Sintering

In this paper, carbon nanotube (CNT) containing aluminum composite materials, which have good thermal conductivity, are made by the plasma activated sintering. CNT and vapor-grown carbon fiver (VGCF) as a super multi-wall CNT are used for the composite materials. To clarify the deformation and thermal characteristic of the composite materials, Young’s modulus and thermal conductivity are measured. Finally, the micromechanical discussion is also conducted using Mori-Tanaka model.

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