On the effect of shear and local deformation in three-point bending tests

Mujika, F.

doi:10.1016/j.polymertesting.2007.06.002

Cited by 65 publications

(58 citation statements)

References 5 publications

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“…Ondoren, zerraren markak kentzeko leungailu bat erabili da. Propietate elastikoei dagokienez, Mujikak [12] proposatutako prozedura erabili da. Lortutako moduluen batez besteko balioak eta desbideratze tipikoaren balioak honako hauek dira:…”

Section: Materialaren Fabrikazioa Eta Probetakunclassified

Laminarteko hausturaren i/ii modu mistoa aztertzeko saiakuntza konfigurazio berri bat

Boyano

Osa²,

Fernandez-Gamiz³

et al. 2018

EKAIA

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Laburpena: Lan honetan, laminatu konpositeen I/II haustura modu mistoa aztertzeko, saiakuntza konfigurazio berri bat aurkezten da. Konfigurazioa End Notched Flexure saiakuntzan oinarrituta dago. Pitzaduraren bi besoen artean, metalezko arrabola bat sartzen da modu mistoa lortzearren. II modua kanpoko kargaren bidez lortzen da, eta I modua, arrabola bat sartuz pitzadura irekitzean lortzen da. Haustura aztertzeko, energia askatzearen tasa erabiltzen da. Haustura modu bakoitzari dagokion tasa, analitikoki kalkulatu ondoren, elementu finituen bidezko kalkuluetan lortutako emaitzekin erkatzen da. Lan esperimentalean, karbono zuntzez eta epoxi matrizez osatutako norabide bakarreko T300/F593 konpositea erabiltzen da. Pitzadura luzera egoki neurtuta dagoen egiaztatzen da, energia askatzearen tasaren balioak irudikatzen dira, eta haustura irizpide egokia aukeratu da. Gainera, GIc eta GIIc parametroak ere kalkulatzen dira.Hitz gakoak: laminarteko haustura, modu mistoa, energia askatzearen tasa, pitzadura neurketa.Abstract: This study describes a new test configuration, based on an End Notched Flexure test configuration. A metallic roller is inserted between the two arms of the crack in order to get a mixed mode fracture. The external load application gives the mode II, and the opening of the crack is get by means of the inserted roller. Energy release rate is the parameter used for analyzing interlaminar fracture. Each mode energy release rate is determined analytically and the results are compared with the ones obEkaia 34 (ale berezia 2018).indd 37 Ekaia 34 (ale berezia 2018).indd 37

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Section: Materialaren Fabrikazioa Eta Probetakunclassified

Laminarteko hausturaren i/ii modu mistoa aztertzeko saiakuntza konfigurazio berri bat

Boyano

Osa²,

Fernandez-Gamiz³

et al. 2018

EKAIA

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“…Moreover, local deformation at contact points affects deflection behavior of beam under three point bending. Effects of local deformations at supports and load application point are generally captured by modeling them through spring elements [121].…”

Section: Boundary Conditionmentioning

confidence: 99%

“…On the other hand most of the laboratory experimental works are done to validate theoretical simulation models. Experimental research works are carried out on various types of straight [106,108,109,121] and curved [65,73,96,109] beams and their equivalent models such as leaf spring [75,84,107,118,126], arch [122], rectangular plate [136,137], and beam and plate with geometric discontinuity in form of hole [124]. These structures involve various boundary conditions, like simply supported-simply supported [96,107,121,126], clamped-free [73,75,106,109], clamped-simply supported [84], clamped-clamped [122], etc.…”

Section: Experimental Workmentioning

confidence: 99%

“…Experimental research works are carried out on various types of straight [106,108,109,121] and curved [65,73,96,109] beams and their equivalent models such as leaf spring [75,84,107,118,126], arch [122], rectangular plate [136,137], and beam and plate with geometric discontinuity in form of hole [124]. These structures involve various boundary conditions, like simply supported-simply supported [96,107,121,126], clamped-free [73,75,106,109], clamped-simply supported [84], clamped-clamped [122], etc. and various loading conditions such as three point bending [96,118,121], compression [126], tension [126,136], torsion [109,126], cyclic loading [126], pure bending [124], concentrated load [65,73,75,107,109], distributed load [109], combined action of concentrated and distributed loads …”

Section: Experimental Workmentioning

confidence: 99%

“…and various loading conditions such as three point bending [96,118,121], compression [126], tension [126,136], torsion [109,126], cyclic loading [126], pure bending [124], concentrated load [65,73,75,107,109], distributed load [109], combined action of concentrated and distributed loads [106], end moment [73,109] and combined bending-stretching [118], etc. Many experiments are carried out on specially designed rig [65,73,75,84,106,109,118] and universal testing machine [96,121,126,136] whereas some other researchers carried out experiments on standard leaf spring testing rig [107] and electronic post buckling testing platform [59]. Measurement techniques for stress and deformation analysis of beam structures, as implemented by the researchers, are described in the following sub-sections.…”

Section: Experimental Workmentioning

confidence: 99%

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A Review on Stress and Deformation Analysis of Curved Beams under Large Deflection

Ghuku

Saha

2017

IJET

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Abstract. The paper presents a review on large deflection behavior of curved beams, as manifested through the responses under static loading. The term large deflection behavior refers to the inherent nonlinearity present in the analysis of such beam system response. The analysis leads to the field of geometric nonlinearity, in which equation of equilibrium is generally written in deformed configuration. Hence, the domain of large deflection analysis treats beam of any initial configuration as curved beam. The term curved designates the geometry of center line of beam, distinguishing it from the usual straight or circular arc configuration. Different methods adopted by researchers, to analyze large deflection behavior of beam bending, have been taken into consideration. The methods have been categorized based on their application in various formats of problems. The nonlinear response of a beam under static loading is also a function of different parameters of the particular problem. These include boundary condition, loading pattern, initial geometry of the beam, etc. In addition, another class of nonlinearity is commonly encountered in structural analysis, which is associated with nonlinear stress-strain relations and known as material nonlinearity. However the present paper mainly focuses on geometric nonlinear analysis of beam, and analysis associated with nonlinear material behavior is covered briefly as it belongs to another class of study. Research works on bifurcation instability and vibration responses of curved beams under large deflection is also excluded from the scope of the present review paper.

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Toughness and Fracture Properties in Nacre‐Mimetic Clay/Polymer Nanocomposites

Morits

Verho

Sorvari

et al. 2017

Adv Funct Materials

127

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Nacre inspires researchers by combining stiffness with toughness by its unique microstructure of aligned aragonite platelets. This brick‐and‐mortar structure of reinforcing platelets separated with thin organic matrix has been replicated in numerous mimics that can be divided into two categories: microcomposites with aligned metal oxide microplatelets in polymer matrix, and nanocomposites with self‐assembled nanoplatelets—usually clay or graphene oxide—and polymer. While microcomposites have shown exceptional fracture toughness, current fabrication methods have limited nacre‐mimetic nanocomposites to thin films where fracture properties remained unexplored. Yet, fracture resistance is the defining property of nacre, therefore centrally important in any mimic. Furthermore, to make use of these properties in applications, bulk materials are required. Here, up to centimeter‐thick nacre‐mimetic clay/polymer nanocomposites are produced by the lamination of self‐assembled films. The aligned clay nanoplatelets are separated by poly(vinyl alcohol) matrix, with 106–107 nanoplatelets on top of each other in the bulk plates. Fracture testing shows crack deflection and a fracture toughness of 3.4 MPa m1/2, not far from nacre. Flexural tests show high stiffness (25 GPa) and strength (220 MPa) that, despite the hydrophilic constituents, are not substantially affected by exposure to humidity.

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On the effect of shear and local deformation in three-point bending tests

Cited by 65 publications

References 5 publications

Laminarteko hausturaren i/ii modu mistoa aztertzeko saiakuntza konfigurazio berri bat

Laminarteko hausturaren i/ii modu mistoa aztertzeko saiakuntza konfigurazio berri bat

A Review on Stress and Deformation Analysis of Curved Beams under Large Deflection

Toughness and Fracture Properties in Nacre‐Mimetic Clay/Polymer Nanocomposites

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