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Stany graniczne murów obronnych

Kubik Jan

Inżynieria i Budownictwo

2020

R. 76, nr 7

329--332

Przedstawiono mechanizmy zniszczenia zabytkowego muru obronnego w wyniku powstania odspojeń przypowierzchniowych warstw ściany zabytku. Przeanalizowano najprostszy mechanizm zniszczenia, kiedy występuje kontakt cierny tylko w podstawie płata odłamu. Oszacowano graniczne parametry określające wystąpienie tego mechanizmu zniszczenia.

The paper presents the destruction mechanism of the historic defensive walls. The reason of that phenomena is the decay of the wall surface layer. In particular, the slip at the base of the wall was analysed.

Metoda DIC

Marcinczak Dorota

Builder

2019

R.23, nr 2

66--68

The article presents tests of a reinforced concrete beam strengthened in a shear with PBO-FRCM composite materials. Measurement of the deformation of the composite was carried out using two methods - with strain gauges and the optical DIC method (Digital Image Correlation). The DIC method consists in taking a series of photographs of the tested object before and during loading. The surface of the tested element must have randomly spaced spots that are applied to the object before measurement. During the study, the cameras monitor the shifting of spots against each other, which in comparison to the reference image before loading gives information about strains and stresses of the tested element. Measurements of deformation of composite materials using strain gauges are difficult to clearly analyze, because the strain gauge is in a specific, limited place, which does not correspond to the work of the entire composite. In addition, the strain gauge tends to break at the place of crack. The article discusses this problem by presenting the results of deformation of PBO-FRCM composite meshes measured in two mentioned ways, their comparison and discussion of results.

Destruction Mechanism of ZnAl4 as Cast Alloy Subjected to Cavitational Erosion Using Different Laboratory Stands

Jasionowski R., Polkowski W., Zasada D.

Archives of Foundry Engineering

2016

Vol. 16, iss. 1

19--24

The main reason of a cavitational destruction is the mechanical action of cavitation pulses onto the material’s surface. The course of cavitation destruction process is very complex and depends on the physicochemical and structural features of a material. A resistance to cavitation destruction of the material increases with the increase of its mechanical strength, fatigue resistance as well as hardness. Nevertheless, the effect of structural features on the material’s cavitational resistance has been not fully clarified. In the present paper, the cavitation destruction of ZnAl4 as cast alloy was investigated on three laboratory stands: vibration, jet-impact and flow stands. The destruction mechanism of ZnAl4 as cast alloy subjected to cavitational erosion using various laboratory stands is shown in the present paper.