Wyniki wyszukiwania - BazTech

1

Study of the behavior of the Al 2017-A aluminium plate corroded and with horizontal cracks treated by the technique of composite materials

Berrahou Mohamed, Benzineb Hayet

Advances in Materials Science

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2023

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Vol. 23, nr 2(76)

5--24

EN

This work presents a comprehensive study consisting of two aspects: a numerical analytical aspect and a laboratory experimental aspect. The numerical study was a three-dimensional finite element numerical analysis of performance of corroded and horizontally cracked aluminium plates, which were repaired by composite patching. The effect of the composite types on the variance of the damaged area of the adhesive (FM-73) and their efficiency on the stress intensity factor were studied. In the experimental study, corroded aluminium plates were prepared and repaired them using technology of the composite. The results showed that the panels that were repaired with composite (boron/epoxy) give values of stress intensity factor (KI) and damaged area ratio (DR) less than the other two studied composites (glass/epoxy and graphite/epoxy), and increase the ultimate strength of plates damage, and this leads to the conclusion that (Boron/epoxy) increases the performance and durability of (Al 2017-A) plates.

2

Badania parametrów mechaniki pękania betonów asfaltowych konwencjonalnych i o wysokim module sztywności

Szydłowski C., Judycki J.

Drogownictwo

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2014

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nr 7-8

219--225

PL

W artykule przedstawiono przegląd literatury oraz podstawy teoretyczne wyznaczania krytycznej wartości współczynnika intensywności naprężeń KIC, oraz całki JC, charakteryzującej krytyczną prędkość uwalniania energii. Przedstawiono również wyniki badań laboratoryjnych parametrów mechaniki pękania betonów asfaltowych konwencjonalnych i o wysokim module sztywności. Na podstawie otrzymanych wyników dokonano próby oceny badanych mieszanek pod kątem odporności na pękanie.

EN

The paper presents the literature review and theoretical approach for determining the critical stress intensity factor KIC and the J-integral, characterized by the critical strain energy release rate. It also presents the results of laboratory tests of fracture mechanics parameters of conventional asphalt concrete and high modulus asphalt concrete. On the basis of the results the studied asphalt concretes were evaluated for resistance to fracture.

3

A crack between two dissimilar media

Molski K.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

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2001

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Vol. 269, z. 67

183-202

EN

The present paper deals with the assessment of strength of a structure with a crack located between two different elastic materials subjected to extensional and in-plane non-uniform loading. Some problems concerned with the complex exponent of the stress field, oscillatory singularity range near the crack tip and interpretation of stress intensity factors KI and KII are discussed. New modified stress intensity factors KI and KII are proposed and analytical formulae of the stress field components around the crack tip are given. Theoretical results of the stresses are compared to the numerical ones obtained by means of the boundary element method BEM. Normalised weight functions are also obtained which enable to determine numerical values of the stress intensity factors KI and KII for any normal and shear stresses released along the crack surfaces. Dugdale strip yield model is also extended to interfacial crack. Some particular solutions of the model are presented for various material constants and loading conditions. Crack opening displacement parameter based on the energy approach is also derived and discussed.