1999
DOI: 10.1590/s0104-14281999000100010 View full text |Buy / Rent full text
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Abstract: Nesse trabalho é realizada uma análise descritiva do teste de impacto tipo Izod instrumentado e são mostradas suas vantagens em relação ao impacto convencional na obtenção de diagramas de força e energia de fratura em tempo-real. Estes diagramas além de fornecerem dados do material em termos de sua resistência ao impacto tradicional, contém informações detalhadas sobre os mecanismos de fratura e as principais características apresentadas durante a propagação da trinca no corpo de prova. A medida da variação da… Show more

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“…At room temperature, the fracture surface morphology has typical ductile characteristics with the presence of regions of shear flow due to “whitening” under tension . Figure shows the photos of the fracture surface of the samples obtained by optical microscopy, in which the direction of crack propagation can be verified.…”
Section: Resultsmentioning
“…The sample > 2002 presents encrusted particles can be pigmented or load, since this sample has a monitor with a gray frame. The observation of the fracture surface by SEM also allows one to verify the correlation between the type of fracture and the characteristics shown in the images [22]. In the case of the images shown in Figure 6, it can be seen that the fracture is of ductile type.…”
Section: Flexion Testmentioning
“…40,41 One of the most used standard impact test is defined as Izod impact test, which provides a comparison of different toughness levels for polymer samples, which are fractured under standard conditions. 39…”
Section: Resultsmentioning
“…Figure 7a-c shows similar fracture mechanisms, with relatively smooth surfaces, reflecting a fragile (brittle) fracture mode. Figure 7d fracture surface is clearly different from the others, displaying regions which suffered plastic deformation, represented by the regions of shear flow, characteristics of typically ductile fractures [43][44][45]. Figure 7e shows a greater magnification from Fig.…”
Section: Scanning Electron Microscopy (Impact Surface)mentioning
“…Assim quando a blenda PBT/ABS for submetida a uma solicitação sob impacto, as partículas de borracha concentrarão tensão e distribuirão o campo de tensão igualmente por toda amostra, aumentando a resistência ao impacto da amostra como um todo. Para os resultados dos ensaios de resistência ao impacto discutidos a seguir, a TTFD foi determinada segundo critério estabelecido por Correa et al [32] .…”
Section: Resistência Ao Impactounclassified