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Effects of strain rate on transverse tension properties of a carbon/epoxy composite: Studied by moire photography
Luleå tekniska universitet.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.ORCID-id: 0000-0003-0630-2037
1999 (Engelska)Ingår i: Composites. Part A, Applied science and manufacturing, ISSN 1359-835X, E-ISSN 1878-5840, Vol. 30, nr 3, s. 305-316Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The dependence on strain rate of the mechanical properties of a high performance carbon fibre/epoxy composite loaded in transverse tension has been investigated. Dog-bone shaped specimens have been tested in quasi-static and dynamic loading conditions. The dynamic tests were performed in a split Hopkinson bar at strain rates between 100 and 800 s-1. A moiré technique combined with high-speed photography, at framing rates of 0.25-1 MHz, was used for extraction of the local strain fields. The transverse mechanical properties were found to have weak or no dependence on strain rate. The average transverse modulus did not depend on strain rate, whereas the strain to and stress at failure were found to increase slightly with increased strain rate. For these dog-bone shaped specimens the strain evaluated by conventional Hopkinson bar technique was found to underestimate the true strain field measured by moiré technique. Finally, the moiré technique facilitated crack-propagation monitoring in real time. Crack speeds up to 2300 m s-1 were measured at transverse crack propagation.

Ort, förlag, år, upplaga, sidor
1999. Vol. 30, nr 3, s. 305-316
Nationell ämneskategori
Kompositmaterial och -teknik
Forskningsämne
Polymera konstruktionsmaterial
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URN: urn:nbn:se:ltu:diva-8965DOI: 10.1016/S1359-835X(98)00123-7Lokalt ID: 785b51b0-021d-11dc-ad0a-000ea68e967bOAI: oai:DiVA.org:ltu-8965DiVA, id: diva2:981903
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Godkänd; 1999; 20070514 (cira)Tillgänglig från: 2016-09-29 Skapad: 2016-09-29 Senast uppdaterad: 2018-06-14Bibliografiskt granskad

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Asp, Leif

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