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The Influence of Square and Hexagonal Array of Cylindrical Holes on the Elastic and Strength Properties of EN AW-5754 Aluminium Alloy Sheet Metal

100%

Wieczorek M. , Muzykiewicz W.

tom Vol. 18, no 6

133--144

The paper presents research results on the influence of a regular perforation pattern on the modulus of elasticity (Young’s modulus) and on the strength properties of EN AW-5754 aluminium alloy sheet. Square and hexagonal array of cylindrical (in the plane of the sheet metal – round) holes was considered, maintaining a constant hole diameter and pitch value. The reference material was solid sheet metal (without perforation) of the same grade and thickness. It was found that hexagonal perforation pattern reduces the Young’s modulus and strength of the material to a greater extent compared to square array of holes, while maintaining a higher uniformity of the distribution of these parameters in the plane of the sheet metal. The comparative analysis of the elastic and strength properties of sheet metal with straight and hexagonal perforation was also carried out accounting for mass loss ratio.

Properties of rubber-like materials and their blends in wide range of temperatures – experimental and numerical study

61%

Konarzewski M. , Stankiewicz M. , Sarzyński M. , Wieczorek M. , Czerwińska M. , Prasuła P. , Panowicz R.

tom Vol. 17, no. 3

317--332

Elastomers are widely used in many industries. Their use requires thorough knowledge of their strength and stiffness parameters over a wide temperature range. However, determination of the parameters of such materials is still a challenge. Therefore, the paper presents research methodology allowing determination of the properties of rubber-like materials in a wide range of stretch and temperatures (from +50°C to 25°C) by using the example of styrene-butadiene rubber (SBR) and natural rubber (NR) elastomers. Additionally, two blends, chloroprene rubber/nitrile-butadiene rubber (CR/NBR) and NR/SBR blends, were also considered. Based on physical premises, a polynomial and Arruda–Boyce hyperelastic constitutive models parameters were determined using two different methods, namely curve-fitting and the successive response surface method.