On the Theory of Diffraction by an Aperture in an Infinite Plane Screen. II.

The thermo-mechanical integration of polymer films requires a precise knowledge of material properties. Nanoindentation is a widely used testing method for the determination of material properties of thin films such as Young’s modulus and the hardness. An important assumption in the analysis of the indentation is that the indented medium is a semi-infinite plane or half space, i.e., it has an “infinite thickness.” In nanoindentation the analyzed material is often a thin film that is deposited on a substrate. If the modulus ratio is small, (soft film on hard substrate) and the penetration depth is small too, then the Hertzian assumption does not hold. We investigate this situation with spherical and conical indentation. Measurement results are shown using spherical indentation on a visco-elastic thin polymer film and a full visco-elastic characterization is presented.

Download Full-text

Study of Method for Determination of Thermal Conductivity of Automotive Interior Materials

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.526.46 ◽

2014 ◽

Vol 526 ◽

pp. 46-51

Author(s):

Li Xiong Zhang ◽

Rong Gang Gao

Keyword(s):

Thermal Conductivity ◽

Conductivity Measurement ◽

Transient Heat Conduction ◽

Traditional Theory ◽

Infinite Plane ◽

Plane Source ◽

Transient Plane Source ◽

Wide Range ◽

Automotive Interior

Based on the traditional theory of transient plane source for thermal conductivity measurement, this paper designed and developed a new pattern of heating and temperature sensing probe, presented the study of transient heat conduction of half-infinite plane while being heated, established a modified mathematical model of transient plane source method, and achieved the measurement of thermal conductivity of automotive interior material sample by the data processing method of mathematical iteration and liner regression using the modified transient plane source probe. According to the data of experiments, the instrument which this paper designed has a high precision of 5% and a wide range of 0.003-1W/(mK).This paper provides a practicable way for heat capacity determination of automotive interior materials.

Download Full-text

Lyapunov instability of the stationary flows of polymeric fluid in an infinite plane channel with constant flow rate

Journal of Mathematical Analysis and Applications ◽

10.1016/j.jmaa.2021.125541 ◽

2021 ◽

pp. 125541

Author(s):

A.M. Blokhin ◽

D.L. Tkachev ◽

A.V. Yegitov

Keyword(s):

Flow Rate ◽

Plane Channel ◽

Infinite Plane ◽

Constant Flow ◽

Polymeric Fluid ◽

Constant Flow Rate ◽

Stationary Flows ◽

Lyapunov Instability

Download Full-text

Nutrition Screening Index for Older Adults (SCREEN II©) Demonstrates Sex and Age Invariance

Journal of Nutrition for the Elderly ◽

10.1080/01639361003772426 ◽

2010 ◽

Vol 29 (2) ◽

pp. 192-210 ◽

Cited By ~ 4

Author(s):

Holly D. Reimer ◽

Heather H. Keller ◽

Scott B. Maitland ◽

Jessica Jackson

Keyword(s):

Older Adults ◽

Nutrition Screening ◽

Screen Ii

Download Full-text

Scattering of SH Wave on Periodic Cracks in an Infinite Plane of Piezoelectric/Piezomagnic Composite Materials

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.166-169.3364 ◽

2012 ◽

Vol 166-169 ◽

pp. 3364-3368

Author(s):

Wei Shi ◽

Li Xia Ma

Keyword(s):

Stress Intensity Factor ◽

Integral Equation ◽

Composite Materials ◽

Piezoelectric Materials ◽

Infinite Plane ◽

Sh Wave ◽

Scattering Problems ◽

Sh Waves ◽

Periodic Cracks ◽

The Fourier Transform

In this paper, the scattering problems of SH waves on periodic cracks in an infinite of piezoelectric/piezomagnic composite materials bonded to an infinite of homogeneous piezoelectric materials is investigated, the Fourier transform techniques are used to reduce the problem to the solution of Hilbert singular integral equation, the latter is solved by Lobotto-Chebyshev and Gauss integral equation, at last, numerical results showed the effect of the frequency of wave, sizes and so on upon the normalized stress intensity factor.

Download Full-text