ASTM C1259 PDF

Historical Version s - view previous versions of standard. More C Flat plates and disks may also be measured similarly, but the required equations for determining the moduli are not addressed herein. The specimens are subjected to minute strains; hence, the moduli are measured at or near the origin of the stress-strain curve, with the minimum possibility of fracture.

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Specimens of these materials possess specific mechanical resonant frequencies that are determined by the elastic modulus, mass, and geometry of the test specimen.

The dynamic elastic properties of a material can therefore be computed if the geometry, mass, and mechanical resonant frequencies of a suitable rectangular, cylindrical, or disc geometry test specimen of that material can be measured. Dynamic Young's modulus is determined using the resonant frequency in the flexural mode of vibration. The dynamic shear modulus, or modulus of rigidity, is found using torsional resonant vibrations.

Dynamic Young's modulus and dynamic shear modulus are used to compute Poisson's ratio. Specimen supports, impulse locations, and signal pick-up points are selected to induce and measure specific modes of the transient vibrations.

A transducer for example, contact accelerometer or non-contacting microphone senses the resulting mechanical vibrations of the specimen and transforms them into electric signals.

See Fig. The transient signals are analyzed, and the fundamental resonant frequency is isolated and measured by the signal analyzer, which provides a numerical reading that is or is proportional to either the frequency or the period of the specimen vibration. The appropriate fundamental resonant frequencies, dimensions, and mass of the specimen are used to calculate dynamic Young's modulus, dynamic shear modulus, and Poisson's ratio.

The rod and bar geometries are described in the main body. The disc geometry is addressed in Annex A1. See 5. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Our policy towards the use of cookies Techstreet, a Clarivate Analytics brand, uses cookies to improve your online experience.

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Specimens of these materials possess specific mechanical resonant frequencies that are determined by the elastic modulus, mass, and geometry of the test specimen. The dynamic elastic properties of a material can therefore be computed if the geometry, mass, and mechanical resonant frequencies of a suitable rectangular, cylindrical, or disc geometry test specimen of that material can be measured. Dynamic Young's modulus is determined using the resonant frequency in the flexural mode of vibration. The dynamic shear modulus, or modulus of rigidity, is found using torsional resonant vibrations. Dynamic Young's modulus and dynamic shear modulus are used to compute Poisson's ratio.

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