In situ measurement of the Young`s modulus of an embedded inclusion by acoustic microscopy

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Engineering Materials and Technology

DOI:https://doi.org/10.1115/1.2805986· OSTI ID:483646

Canumalla, S; Gordon, G A; Pangborn, R N ^[1]

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1. Pennsylvania State Univ., University Park, PA (United States)

Alumina-silicate inclusions (shot) have been found to adversely affect the mechanical properties of a short alumina-silicate fiber reinforced aluminum alloy (A356). To better understand the differences between the responses of the shot and fibers of applied loads, the Young`s modulus of the shot is measured and compared to that of the fibers. The Rayleigh wave speed in the shot (cross-sectional area of 200 {micro}m x 150 {micro}m), measured in situ to be 4041 m/s using a scanning acoustic microscope, was used to calculate the Young`s modulus of the shot particle (132 GPa). The accuracy of the technique and the experimental arrangement used was verified to be better than 4% by independent measurements of the Rayleigh wave speeds in the aluminum alloy matrix and an embedded sapphire fiber. The fiber modulus was estimated to be 225 GPa based on a comparison of previously measured composite modulus with micromechanical predictions. Thus, shot was found to have a Young`s modulus 40% lower than that of the fibers. The applicability of the V(z) technique has been demonstrated for measuring the elastic properties over a microscopic area, even when the target material is an embedded inclusion.

• Sponsoring Organization: USDOE
• OSTI ID: 483646
• Journal Information: Journal of Engineering Materials and Technology, Journal Name: Journal of Engineering Materials and Technology Journal Issue: 2 Vol. 119; ISSN 0094-4289; ISSN JEMTA8
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACOUSTIC MICROSCOPY
ALUMINIUM BASE ALLOYS
ALUMINIUM SILICATES
COMPOSITE MATERIALS
EXPERIMENTAL DATA
INCLUSIONS
MATHEMATICAL MODELS
PREDICTION EQUATIONS
VALIDATION
YOUNG MODULUS