Internal stresses in planar random fiber aluminum composites. 1: Tensile tests and cyclic Bauschinger experiments at room temperature and 77 K

Journal Article · Fri Dec 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(95)00116-D· OSTI ID:178001

Johannesson, B; Ogin, S L ^[1]

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1. Univ. of Surrey, Guildford (United Kingdom). Dept. of Materials Science and Engineering

Internal stresses in planar random alumina fiber reinforced aluminum with a range of fiber volume fractions have been studied theoretically and in tensile tests and cyclic Bauschinger experiments at room temperature and 77 K. The Eshelby S tensor for a planar random array of fibers is calculated, which allows the mean field model to be used to predict the internal stresses. The conventional Orowan-Wilson method of analyzing cyclic Bauschinger experiments is modified, enabling the plastically and thermally induced matrix mean stresses to be separated. This analysis is applied to experimental results and the plastic mean stress and the initial magnitude of the thermal mean stress in the matrix are measured. The results for the thermal matrix mean stress are compared with measurements from monotonic flow curves and generally good agreement is observed. The measured thermal matrix mean stress in these composites is approximately independent of fiber volume fraction.

• OSTI ID: 178001
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 12 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
ALUMINIUM OXIDES
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
MATHEMATICAL MODELS
MATRIX MATERIALS
PLASTICITY
PREDICTION EQUATIONS
STRESSES
TENSILE PROPERTIES
THERMAL STRESSES