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Stiffness of Auxetic Foams

100%
Więcek T., Wasilewski A.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
182-184
EN
An optical method is used for measurements of mechanical properties of foams. The method is based on analysis of diffraction pattern and does not require calibration. The measurements of the stiffness were performed for the conventional and auxetic foams. It was found that the stiffness of auxetic foams is several times greater than that of conventional foams.
2
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An Investigation of the The dynamic Young Moduli of Twisted Fibres

100%
Wasilewski A., Więcek T.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 2
231-233
EN
This paper describes a modified laser system to measure the dynamic Young modulus and logarithmic decrement of damping for twisted fibers. A modified impulse mechanical spectrometer was designed and built by the authors. The effect of twisting on the values of the dynamic Young modulus and logarithmic decrement of damping was studied. The dynamic Young modulus and logarithmic decrement of damping were investigated for long PET fibers with a 200 μm diameter. This experimental method does not require calibration because it contains standard length which is the wavelength of the laser beam.
3
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A Finite-Element Flash Method for Measuring Thermal Conductivity of Liquid

81%
Mamczur J., Wasilewski A., Więcek T.
Acta Physica Polonica A
|
2015
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vol. 128
|
issue 2
193-195
EN
A laser beam is used to heat a portion of liquid closed in a vessel from the top of it to avoid convection. The temperature is measured at the bottom of the vessel by a laser waveguide sensor. The heating and measuring methods allow using a small amount of liquid of the order of a milliliter fraction. The heat flow through the liquid as well as the surrounding vessel and space is modeled by the finite-element method to calculate the temperature at the bottom vs. time. Thus obtained dependence is used then as a fitting function to get the liquid thermal conductivity among some other fitting parameters.
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