Experimental analysis of deformation mechanisms in a closed-cell aluminum alloy foam

Bastawros, Ashraf F.; Bart‐Smith, Hilary; Evans, A.G.

doi:10.1016/s0022-5096(99)00035-6

Cited by 341 publications

(182 citation statements)

References 17 publications

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“…The trends we observe in sti!ness and strength are similar to those of Bastawros et al [13]. In that study, uniaxial compression tests were performed on prismatic aluminum foam specimens of constant length and width and varying depth.…”

Section: Uniaxial Compressionsupporting

confidence: 87%

Size effects in ductile cellular solids. Part II: experimental results

Andrews

Gioux

Onck

et al. 2001

International Journal of Mechanical Sciences

510

234

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There is increasing interest in the use of metallic foams in a variety of applications, including lightweight structural sandwich panels and energy absorption devices. In such applications, the mechanical response of the foams is of critical importance. In this study, we have investigated the e!ect of specimen size (relative to the cell size) on selected mechanical properties of aluminum foams. Models, described in the companion paper, provide a physical basis for understanding size e!ects in metallic foams. The models give a good description of size e!ects in metallic foams.

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Section: Uniaxial Compressionsupporting

confidence: 87%

Size effects in ductile cellular solids. Part II: experimental results

Andrews

Gioux

Onck

et al. 2001

International Journal of Mechanical Sciences

510

234

View full text Add to dashboard Cite

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“…If data about the sample interior (bulk) are needed, the best way to acquire them is X-ray computed tomography (CT) (Huston 2011), as used e.g. in (Yoshihiko Hangai 2010; Blazy et al 2004;Barth-Smith et al 1998;Bastawros et al 2000). Generally, this type of imaging approach consists in a collimated X-ray beam being transmitted through an object and its intensity measured by a detector.…”

Section: Determination Of Basic Cellular Materials Characteristicsmentioning

confidence: 99%

“…studies of plastic deformation mechanisms in aluminum closed cell foams conducted and described in (Bastawros et al 2000;Barth-Smith et al 1998;Bastawros and McManuis 1998).…”

Section: Observation Of Deformation Mannermentioning

confidence: 99%

“…The method allows consecutive image capturing sufficiently fast to study cell distortion while the sample is being deformed. Exemplary use of CT to examine closed cell aluminum foam while deformation can be found in (Barth-Smith et al 1998;Bastawros et al 2000). Some more details about this imaging technique are written above in section 3.…”

Section: Observation Of Deformation Mannermentioning

confidence: 99%

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Methodology for Experimental Investigations of Metal Foams and Their Mechanical Properties

Stręk

2012

mech

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SUMMARYThis paper presents a comprehensive, systematic approach on experimental investigations of structure and mechanical properties of metal foams. Based on a thorough state of the art study, the existing solutions have been synthesised with recent developments in the discussed field to become a proposition of a possibly complete methodology for observation and testing of cellular metals. Material properties acquired in the described manners can constitute reliable reference result base e.g. for identification and verification of failure criteria. This paper describes sample preparation procedures and next discusses techniques which enable one to characterise foam structure. There are also presented procedures for determining strength limits in different load cases: uniaxial tension or compression, shear and torsion as well as multiaxial states. The tests are discussed in terms of their specific application to study cellular metallic materials.Keywords: metal foams, tensile tests of foams, compression tests of foams, multiaxial tests of foams, shear tests of foams METODOLOGIA BADAÑ EKSPERYMENTALNYCH PIAN METALICZNYCH I ICH W£ASNO CI MECHANICZNYCH Przedstawiono kompleksowe, systematyczne podej cie do badañ do wiadczalnych struktury i w³a ciwo ci mechanicznych pian metalowych. Na podstawie dog³êbnej analizy stanu rzeczy rozwi¹zania istniej¹ce zsyntetyzowano, uwzglêdniaj¹c najnowsze zmiany w omawianym zakresie tak, aby przedstawiae propozycje mo¿liwie pe³nej metodologii obserwacji i badañ metali komórkowych. Wla ciwo ci materia³u uzyskane w czasie zaproponowanych testów mog¹ stanowiae wiarygodn¹ bazê odno nych wyników, np. do identyfikacji i weryfikacji kryteriów wytê¿enia. Opisano procedury przygotowania próbek, a nastêpnie omówiono techniki umo¿liwiaj¹ce scharakteryzowanie struktury piany. Przedstawiono równie¿ procedury okre lania granic wytrzyma³o ci w ró¿nych przypadkach obci¹¿e-nia: jednoosiowego rozci¹gania lub ciskania, cinania i skrêcania oraz wieloosiowych stanach obci¹¿enia. Badania zosta³y omówione w odniesieniu do szczególnego zastosowania ich do zbadania komórkowych materia³ów metalicznych.S³owa kluczowe: pianki metaliczne, próba rozci¹gania pianek, próba ciskania pianek, próba wieloosiowa pianek, test cinania pianek

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“…Godine 1991, Luo i grupa autora [55] su uspešno razvili stereovizijski sistem sa dve kamere za merenje deformacija i primenili ih na probleme mehanike loma [56,57]. Da bi prevazišli ključna ograničenja metode (neusklađenost prilikom triangulacije odgovarajućih tačaka, proces kalibracije koji je naporan i dugotrajan), Helm i grupa autora [58,59] su uspešno razvili stereovizijski sistem sa dve kamere koji (a) uključuje uticaje perspektive na oblik malih posmatranih površina, (b) ograničava analizu na epipolarne linije i (c) pojednostavljuje proces kalibracije sistema.…”

Section: Metoda Korelacije Digitalnih Slikaunclassified

Stresses and strains of geometrically complex structures of pipeline fittings

Mitrović¹

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PREDGOVOROvaj rad je nastao nakon višegodišnjeg istraživanja na projektima finansiranim od strane Ministarstva za prosvetu i nauku Republike Srbije, a pre svega tokom rada na projektima "Razvoj savremenih metoda dijagnostike i ispitivanja mašinskih struktura", pod evidencionim brojem TR 35040 i "Razvoj i primena metoda i laboratorijske opreme za ocenjivanje usaglašenosti tehničkih proizvoda" pod evidencionim brojem TR 35031.Pre svega, zahvaljujem se prof. dr Aleksandru Petroviću, mentoru, na nesebičnom zalaganju, podršci, brojnim korisnim savetima i primedbama koji su vešto usmeravali moj naučni rad i uticali na kvalitet ove disertacije. Zahvaljujem se prof. dr Tašku Maneskom na veoma korisnim savetima i podršci koja je u ovoj disertaciji bila od presudnog značaja. Takođe, zahvaljujem se prof. dr Aleksandru Sedmaku, prof. dr Srbislavu Geniću i prof. dr Miloradu Zriliću, koji su doprineli da ova disertacija bude sadržajnija i preglednija.Zahvalnost za stručnu i kolegijalnu pomoć dugujem kolegama Milošu Miloševiću, as.Nikoli Momčiloviću i as. Žarku Miškoviću.Zahvaljujem se svojim roditeljima, Snežani i Radivoju, i svom bratu Nemanji koji su bezrezervno bili tu za mene, na pravi način i u pravo vreme dali vetra u leđa, kada god je trebalo bodrili i podržavali da istrajem do kraja. Mojoj Aleksandri, hvala na ljubavi, strpljenju i pomoći koju je pružala za vreme izrade ove disertacije, njen osmeh i zagrljaj uklanjao je sve poteškoće na ovom putu. AutorNaponi i deformacije struktura kompleksne geometrije cevovodne armature ii NAPONI I DEFORMACIJE STRUKTURA KOMPLEKSNE GEOMETRIJE CEVOVODNE ARMATURE Rezime:Dosadašnja istraživanja u oblasti opreme pod pritiskom, odnosno merenja i određivanja napona i deformacija struktura kompleksne geometrije su se oslanjala na analitičke proračune najčešće bazirane na teoriji ljuski, numeričke proračune upotrebom računarskih softvera i konvencionalne eksperimentalne metode. Kao jedan od najčešćih zaključaka u svojim radovima, istraživači su naveli nepostojanje adekvatnih eksperimentalnih rezultata u postojećoj literaturi, odnosno iskazali potrebu za detaljnom eksperimentalnom analizom kritičnih mesta za koje nije moguće precizno odrediti veličine pomeranja, deformacija ili napona upotrebom analitičkih obrazaca ili numeričkih modela.Ograničenja korišćenih eksperimentalnih metoda su se ogledala u više aspekata. Prvo, za analizu geometrijskih diskontinuiteta, najčešće su korišćene standardizovane epruvete sa pripremljenim diskontinuitetima i ispitivane na zatezanje. Na osnovu dobijenih rezultata su pravljeni dijagrami sa faktorima koncentracije napona, koji su kasnije primenjivani na probleme geometrijski kompleksnih struktura. Ovakav pristup je davao samo okvirna rešenja, koja nisu bila dovoljno precizna i tačna. Drugo, eksperimenti su sprovođeni konvencionalnim metodama. Ograničenje konvencionalnih metoda je lokalno merenje, odnosno dobijanje vrednosti merenih veličina samo u jednoj tački. Treće, merenja su vršena samo u blizini geometrijskih diskontinuiteta, a ne na samim spojevima geom...

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Experimental analysis of deformation mechanisms in a closed-cell aluminum alloy foam

Cited by 341 publications

References 17 publications

Size effects in ductile cellular solids. Part II: experimental results

Size effects in ductile cellular solids. Part II: experimental results

Methodology for Experimental Investigations of Metal Foams and Their Mechanical Properties

Stresses and strains of geometrically complex structures of pipeline fittings

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