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Damage evolution and characterisation of crack types in CF/EP laminates loaded at low temperatures
Swerea SICOMP AB.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0001-9649-8621
2008 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 75, no 9, p. 2631-2641Article in journal (Refereed) Published
Abstract [en]

Tensile testing of CF/EP AS4/8552 cross-ply laminates at room (RT) and cryogenic (around -150 deg C) temperatures has been performed to study the effect of temperature on damage (intralaminar cracking) evolution. Microscopy studies of the specimen edges showed a significant difference in damage pattern for the two different temperatures. At the low temperature (LT), more complex crack types were obtained that could not be found in specimens tested at the RT. The effect of these crack types on the laminate tensile modulus was studied by FEM. In analytical stiffness modelling complex shape crack was replaced by an 'effective' normal (straight) crack with an 'effective' crack opening displacement (COD) that leads to the same reduction in laminate stiffness. A crack efficiency factor was introduced to characterize the significance of complex crack shapes for stiffness reduction. The reduction of tensile modulus for a laminate damaged at low temperature was measured and compared with model predictions.

Place, publisher, year, edition, pages
2008. Vol. 75, no 9, p. 2631-2641
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-11325DOI: 10.1016/j.engfracmech.2007.03.004ISI: 000255253500005Scopus ID: 2-s2.0-40649103441Local ID: a44ad230-3c75-11dd-8e42-000ea68e967bOAI: oai:DiVA.org:ltu-11325DiVA, id: diva2:984275
Note
Validerad; 2008; 20080617 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Varna, Janis

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