Search results for "Materiali"

Three-Point Flexural Behaviour of GFRP Sandwich Composites: A Failure Map

2010

In this work, the failure mechanisms of GFRP/PVC foam core sandwich structures subjected to three-point bending are analysed. By varying the skin thickness (t ) and the span length between supports (l), experimental tests were carried out in order to find the relationship between the geometrical configuration of the sandwiches and the failure mechanism. By plotting failure mechanism on a graph of l against t , a failure map was created identifying the three typical failure mode regions of these sandwiches. The graph clearly shows the failure mode corresponding to each combination of l and t . To help optimise the use of these sandwich beams as structural elements, a theoretical failure mode…

Effect of ultraviolet and moisture action on biodegradable polymers and their blend

2020

In this work, the suitability of polylactic acid (PLA), polybutylene adipate terephthalate (PBAT) and PBAT/PLA blend samples to outdoor applications were investigated in terms of mechanical, morphological and visual properties in presence of ultraviolet action and water, finding that PLA in particular can be actually considered for such applications.

Lekzijas par wehsturisko materialismu

1920

On the influence of the initial ramp for a correct definition of the parameters of fractional viscoelastic materials

2014

Creep and/or Relaxation tests on viscoelastic materials show a power-law trend. Based upon Boltzmann superposition principle the constitutive law with a power-law kernel is ruled by the Caputo's fractional derivative. Fractional constitutive law posses a long memory and then the parameters obtained by best fitting procedures on experimental data are strongly influenced by the prestress on the specimen. As in fact during the relaxation test the imposed history of deformation is not instantaneously applied, since a unit step function may not be realized by the test machine. Usually an initial ramp is present in the deformation history and the time at which the deformation attains the maximum …

INDUCED MODIFICATION OF FLEXURAL TOUGHNESS OF BIO-LIME BASED MORTARS BY ADDITION OF GIANT REED FIBERS

2019

Fibers are often used as reinforcement of brittle materials, like mortars, in order to modify their mechanical behavior; particularly the modification in post-cracking toughness, induced by low elasticity modulus fibers in the artificial stone material, is the main goal in natural fibers mortar manufacturing. In this work Arundo donax L. fibers are used to reinforce lime mortars according to the characteristics of this plant, very commonly available and with high mechanical properties, similar to bamboo, traditionally used in buildings in Spain. Influence of fibers’ length and weight ratio is studied. Particularly, three different fibers’ lengths, 4, 8 and 12 centimeters, and three weight r…

Spekulaation paluu

2017

Kirja-arvio teoksesta Quentin Meillassoux, Äärellisyyden jälkeen. Tutkielma kontingenssin välttämättömyydestä (Après la finitude. Essai sur la nécessité de la contingence, 2006). Suom. Ari Korhonen. Gaudeamus, Helsinki 2017. 286 s. nonPeerReviewed

Kaaos ilman perustaa : Quentin Meillassoux’n korrelationismikritiikki, eli kuinka ajatella absoluuttia

2017

Tutkielmassa analysoin Quentin Meillassoux'n korrelationistisen filosofian kritiikkiä ja todellisuuden radikaalisti kontingentin luonteen -argumenttia.

Digital materialities in the diasporic mourning of migrant death

2019

This article examines memorialization among the family and friends of those who have died at the world’s deadliest border in the Mediterranean Sea. Digital media platforms are central spaces for new, innovative forms of coping with ambiguous loss or the inability to mourn over a dead body. The analysis focuses on the role of digital media technologies and the relationship between digital and material elements in memorialization. I examine the creation and circulation of digital objects of memorialization: visual assemblages in which the material and digital intertwine. The analysis demonstrates that digital media practices are not separate from the material world, nor do they make mourning …

Новый ЛЕФ и киновещь

2019

Abstract In the 1920s, the LEF project moved the discussion about the role of “things in film” – as metonymic and metaphoric, photogenic and functional, and as tools that filled gaps in the narrative, stood in for actors, or operated as generic markers – in a distinctly materialist direction. Sergei Eisenstein and Dziga Vertov were sharply criticized for turning things into symbols in their films. To avoid this aesthetic dispute, Tret’iakov advocated production scripts based on the dominance of material things over plot. Eisenstein, in his unfinished text ‘Play of Objects' (‘Ob igre predmetov’), offers another understanding of things in film. A film-thing (kinoveshch’), in his reading, is f…

Performance of Thin-Film Lithium Energy Cells under Uniaxial Pressure

2008

The objective of this study was two-fold. The first objective was to determine if the all-solid-state thin-film lithium energy cells could withstand the minimal 550 kPa uniaxial pressure required for composite manufacturing, which both specimens successfully did. The second objective was to determine the upper boundary uniaxial pressure limit of operation for the all-solid-state thin-film lithium energy cells. The two all-solid- state thin-film lithium energy cells tested in the present study under uniaxial pressure performed well even when subjected to uniaxial pressures up to about 2.0 MPa. However, pressures higher than this value led to their degradation. The observed degradation was du…