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Damage initiation in unidirectional fiber composites with different degrees of nonuniform fiber distribution
Department of Materials Science and Engineering, Texas A&M University, College Station TX; Department of Metallurgical and Materials Eng., Faculty of Petroleum and Mining Eng., Suez University, Suez, Egypt.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science. Department of Materials Science and Engineering, Texas A&M University, College Station, TX; Department of Aerospace Engineering, Texas A&M University, College Station, TX .
2018 (English)In: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 155, 22-32 p.Article in journal (Refereed) Published
Abstract [en]

This paper reports a study of the initiation of the first failure event in unidirectional composites subjected to transverse tension. Two energy based point failure criteria – critical dilatational energy density and critical distortional energy density – are considered. The manufacturing induced disorder in the fiber distribution in the composite cross section is described in terms of the degree of nonuniformity, which is quantified and for which an algorithm is developed. The nonuniformity is captured in a representative volume element (RVE) whose minimum size is determined based on statistics of nearest fiber distance distribution. Several realizations of the RVE for three fiber volume fractions and three degrees of nonuniformity are analyzed using a finite element model. A parametric study of the effect of matrix/fiber stiffness ratio on the damage initiation is also conducted. Significant effects of the fiber distribution nonuniformity on the strain to onset of damage are found.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 155, 22-32 p.
National Category
Composite Science and Engineering
Research subject
Polymeric Composite Materials
Identifiers
URN: urn:nbn:se:ltu:diva-66797DOI: 10.1016/j.compscitech.2017.11.017Scopus ID: 2-s2.0-85035811334OAI: oai:DiVA.org:ltu-66797DiVA: diva2:1160837
Note

Validerad;2017;Nivå 2;2017-12-04 (rokbeg)

Available from: 2017-11-28 Created: 2017-11-28 Last updated: 2017-12-14Bibliographically approved

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