Influence of the stacking sequence on the through-thickness Young’s moduli of fibrous composite laminates measured by nanoindentation

2020 ◽  
pp. 002199832096565
Author(s):  
Luoyu Roy Xu ◽  
Md Mehadi Hassan ◽  
Osman Anderoglu ◽  
Kai Zhao ◽  
Mark Flores
Keyword(s):  
Young’S Modulus ◽  
Composite Laminates ◽  
Composite Laminate ◽  
Young's Modulus ◽  
Fiber Composite ◽  
Fibrous Composite ◽  
Test Procedures ◽  
Young’S Moduli ◽  
Glass Fiber Composite ◽  
Carbon Fiber Epoxy

Previous approaches to measure the through-thickness Young’s modulus of a composite laminate often employed complicated specimens and test procedures, so very few through-thickness Young’s moduli were reported. An efficient spherical nanoindentation approach was developed to measure the through-thickness Young’s moduli of a woven fibric glass-fiber composite laminate. In this paper, the same approach is extended to the modulus measurement of four carbon fiber/epoxy IM7/937-7 laminates with complicated stacking sequences. The measured through-thickness Young’s moduli were consistent with the transverse Young’s modulus of the same composite system. Results show that the stacking sequences have little influence on the through-thickness Young’s moduli, which could be explained by classical lamination theory for a thin composite laminate.

Transverse Young's Moduli and Cell Shapes in Coniferous Early Wood

Holzforschung ◽  
2002 ◽  
Vol 56 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Ugai Watanabe ◽  
Minoru Fujita ◽  
Misato Norimoto
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Bending Moment ◽  
Cell Models ◽  
Young’S Moduli ◽  
Cell Shapes ◽  
The Difference ◽  
Square Cells ◽  
Experimental Values ◽  
The Relationship

Summary The relationship between transverse Young's moduli and cell shapes in coniferous early wood was investigated using cell models constructed by two dimensional power spectrum analysis. The calculated values of tangential Young's modulus qualitatively explained the relationship between experimental values and density as well as the difference in experimental values among species. The calculated values of radial Young's modulus for the species having hexagonal cells agreed well with the experimental values, whereas, for the species having square cells, the calculated values were much larger than the experimental values. This result was ascribed to the fact that the bending moment on the radial cell wall of square cell models was calculated to be small. It is suggested that the asymmetrical shape of real wood cells or the behavior of nodes during ell deformation is an important factor in the mechanism of linear elastic deformation of wood cells.

scholarly journals Young's modulus estimation in food samples: effect of experimental parameters

2020 ◽  
Vol 21 (4) ◽  
pp. 404
Author(s):  
Ankita Sinha ◽  
Atul Bhargav
Keyword(s):  
Young’S Modulus ◽  
Texture Analysis ◽  
Young's Modulus ◽  
Food Products ◽  
Food Samples ◽  
Texture Measurement ◽  
Test Standards ◽  
Young’S Moduli ◽  
Rate Dependent ◽  
Sample Shape

Texture is an important attribute in the quality assessment of processed food products. Recently, Young's modulus is identified as one of the most important indicators of food texture. However, there is much ambiguity in the literature about quantification and standards for texture analysis. In this paper, the sensitivity of Young's modulus (and thus texture) towards the applied deformation rate, sample shape and size, moisture content is studied experimentally for potato and sweet potato samples. We found that Young's moduli vary by as much as 54% depending on the rate of applied strain, indicating the need for test standards. The strain rate dependent behaviour exhibits the viscoelastic nature of the potato samples, which was further validated by stress relaxation and cyclic tests. Based on our experimental iterations and associated finding of the work, we propose the need for a standardised procedure for measuring Young's modulus and texture analysis. We expect this work to serve as a crucial step toward standardised texture measurement during thermal processing of food products.

Heating Effects on The Young's Modulus of Films Sputtered onto Micromachined Resonators

1998 ◽  
Vol 518 ◽  
Author(s):  
H. Kahn ◽  
M.A. Huff ◽  
A.H. Heuer
Keyword(s):  
Temperature Dependence ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Single Crystal Silicon ◽  
Crystal Silicon ◽  
Resonant Structures ◽  
Young’S Moduli ◽  
Heating Effects ◽  
Sputter Deposited ◽  
Dc Current

AbstractSurface-micromachined polysilicon lateral resonant structures were fabricated and used to determine the temperature dependence of the Young's modulus of the polysilicon. This is done by passing a dc current through the beams during resonance testing, resulting in Joule-heating. The temperatures are calibrated by increasing the dc current until the melting point of silicon is attained. The calculated Young's moduli agree well with reported values for single crystal silicon.In addition, metal films were sputter-deposited onto the polysilicon resonators, and similar experiments performed on the composite devices to determine the temperature dependence of the modulus of the sputtered films. Ni films demonstrate a linear decrease in Young's modulus with temperature. TiNi films demonstrate two distinct modulus values with an intermediate transition region, due to the temperature-induced reversible phase transformation exhibited by TiNi.

EXPERIMENTAL STUDY ON COMPRESSIVE YOUNG’S MODULI AND TENSILE YOUNG’S MODULUS OF FLY ASH CONCRETE

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Yoichi Mimura ◽  
Vanissorn Vimonsatit ◽  
Yuki Watanabe ◽  
Itaru Horiguchi ◽  
Isamu Yoshitake
Keyword(s):  
Fly Ash ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Tangent Modulus ◽  
Early Age ◽  
Secant Modulus ◽  
Tensile Stresses ◽  
Fly Ash Concrete ◽  
Young’S Moduli ◽  
Initial Tangent Modulus

Initial cracks due to volume changes at an early age affect the durability of concrete structures, so numerical simulations are often conducted in order to predict cracks. Such prediction requires some mechanical properties of early age concrete. Tensile Young's modulus is directly dependent on the prediction of tensile stress and is one of the important input data for FEM analysis. However, direct tension test for tensile Young's modulus needs a unique apparatus and specimen, and such test is not suitable for evaluating Young's modulus at early ages of concrete. The present study compared tensile Young's modulus with compressive Young's moduli of Fly ash concrete. Compressive Young's moduli used in this study were secant modulus and initial tangent modulus. In addition, linear modulus taken from a regression line of a compressive stress-strain curve in the range of stresses less than the splitting tensile strength was also evaluated. It is found that the secant modulus, which is generally used as Young's modulus in Japan was clearly smaller than the tensile Young's modulus, which means that, tensile stresses evaluated using a secant modulus might be underestimated. On the other hand, linear modulus and initial tangent modulus were almost equal to the tensile Young's modulus. This result indicates that tensile stresses can be evaluated using Young's modulus obtained from a compression test with general apparatus and specimens.

Size effect analysis of open-hole glass fiber composite laminate using two-parameter cohesive laws

2014 ◽  
Vol 226 (4) ◽  
pp. 1027-1044 ◽  
Author(s):  
Y. Mohammed ◽  
Mohamed K. Hassan ◽  
H. Abu El-Ainin ◽  
A. M. Hashem
Keyword(s):  
Size Effect ◽  
Glass Fiber ◽  
Composite Laminate ◽  
Fiber Composite ◽  
Effect Analysis ◽  
Glass Fiber Composite ◽  
Cohesive Laws ◽  
Open Hole ◽  
Two Parameter

EFFECT OF SPECIMEN SIZE ON YOUNG'S MODULUS OF ELECTRODEPOSITED Ni

2009 ◽  
Vol 16 (02) ◽  
pp. 303-307 ◽  
Author(s):  
HONG WANG ◽  
RUI LIU ◽  
SHENG-PING MAO ◽  
JUN TANG ◽  
CONG-CHUN ZHANG ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Specimen Size ◽  
Young’S Moduli ◽  
Different Dimensions

The Young's moduli of electrodeposited Ni with different dimensions were measured carefully in this paper. The dimensions of tensile specimens were 200, 35, or 5 μm thick and 2400, 200 or 50 μm wide. These specimens were measured with three different approaches. The measured Young's moduli of Ni decrease from 122.1 ± 4.3 to 92 ± 5.2 GPa when the thickness changes from 200 to 5 μm and width changes from 2400 to 50 μm.

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