Morrell, R; Kent, J (2015) The effect of test-piece chamfers on the determination of elastic moduli using the impact excitation method. NPL Report. MAT 77

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Abstract

An experimental analysis of the effect of chamfers on the long edges of bar test-pieces employed for the determination of elastic properties by the impact excitation or resonance methods given in various standards (ASTM C1259 Annex, ASTM C1198 Annex) has been undertaken. The published flexural mode chamfer correction based on moment of inertia works appropriately, but the suggestion that the nominal density value has also to be corrected applies only if the density version of the calculation equation is used, and not if the mass version, as written in the standards, is used.

These standards have no equivalent chamfer correction for determining shear modulus by torsional vibration. Generic correction equations have been developed from experimental results that can be applied to cross-sectional aspect ratios 4 > b/t > 1.3 and chamfer sizes c/t/ < 0.3. These enable Poisson¿s ratio to be determined correctly from chamfered bars.

Item Type:	Report/Guide (NPL Report)
NPL Report No.:	MAT 77
Keywords:	Elastic moduli, shear modulus, chamfers, impact excitation method
Subjects:	Advanced Materials Advanced Materials > Mechanical Measurement
Last Modified:	02 Feb 2018 13:13
URI:	http://eprintspublications.npl.co.uk/id/eprint/6810

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