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ASTM E1876 PDF

January 3, 2020

Buy ASTM E Standard Test Method for Dynamic Young’s Modulus, Shear Modulus, and Poisson’s Ratio by Impulse Excitation of Vibration from SAI. Status: Withdrawn ยท Replaced by: ASTM E Metals — Mechanical Testing; Elevated and Low-Temperature Tests; Metallography(ASTM VOL ). Purchase your copy of ASTM E – 15 as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards available.

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E18876 testing of these materials shall be done in compliance with these material specific standards. 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.

No other units of measurement are included in this standard. Shear modulus To determine the shear modulus, the equipment measures the torsional vibration frequency see picture and calculates the shear modulus using the mass and dimensions of the sample according to the different standards ASTM E, ISOEN The dynamic elastic properties of a material can therefore be computed if the geometry, mass, and mechanical resonant frequencies of a suitable rectangular or cylindrical geometry test specimen of that material can be measured.

Historical Version s – view previous versions of standard. Specimen descriptions should include any specific thermal treatments or environmental exposures that the specimens have received. For predefined shapes like rectangular bars, discs, rods and grinding wheels, the dedicated software calculates the sample’s elastic properties using the sample dimensions, weight and resonant frequency ASTM E Dynamic Young’s modulus is determined using the resonant frequency in either the flexural or longitudinal mode of vibration.

Dynamic Young’s modulus and dynamic shear modulus are used to compute Poisson’s ratio. Flat plates may also be measured similarly, but the required equations for determining the moduli are not presented. The dynamic elastic properties of a material can therefore be computed if the geometry, mass, and mechanical resonant frequencies of a suitable rectangular or cylindrical geometry test specimen of that material can be measured. A range of acceptable resonant frequencies is determined for a specimen with a particular geometry and mass.

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Dynamic Young’s modulus and dynamic shear modulus are used to compute Poisson’s ratio.

To determine the shear modulus, the equipment measures the torsional vibration frequency see picture and calculates the shear modulus using the mass and dimensions of the sample astn to the different standards ASTM E, ISOEN Specimens of these materials possess specific mechanical resonant frequencies that are determined by the elastic modulus, mass, and geometry of the test specimen.

There is no requirement for complex support systems that require elaborate setup or alignment. Specimens of these materials possess specific mechanical resonant frequencies that are determined by the elastic modulus, mass, and geometry of the test specimen. Different resonant frequencies can be excited dependent on the position of the support wires, the mechanical impulse and the microphone.

Afterwards, the acquired vibration signal in the time domain is converted to the frequency domain by a fast Fourier transformation.

Young’s modulus To determine the Young’s modulus, the equipment measures the flexural vibration frequency see picture and calculates the Young’s modulus using the mass and dimensions of the sample according to the different standards ASTM E, ISOEN Active view current version of standard. Dynamic Young’s modulus is determined using the resonant frequency in either the flexural or longitudinal mode of vibration.

The actual dynamic elastic modulus of each specimen need not be determined as long as the limits of the selected frequency range are known to include the resonant frequency that the specimen must possess if its geometry and mass are within specified tolerances.

ASTM E1876 – 15

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. Where possible, the procedures, sample specifications and calculations are consistent with these test methods. The actual asm elastic modulus of each specimen need not be determined as ast as the limits of the selected frequency range are known to include the resonant frequency that the specimen must possess if its geometry and mass are within specified tolerances.

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Flat plates may also be measured similarly, but the required equations for determining the moduli are not presented. There is no requirement for complex support systems that require elaborate setup or alignment. Dynamic Young’s modulus and dynamic shear modulus are used to compute Poisson’s ratio. Test Methods CCCCCand C may differ from this test method in several areas for example; sample size, dimensional tolerances, sample preparation.

Specimens of these materials possess specific mechanical resonant frequencies that are determined by the elastic modulus, mass, and geometry of the test specimen. The testing of these materials shall be done in compliance with these material specific standards. Link to Active This link will always route to the current Active version of the standard.

Theory | IMCE – Your partner in the Impulse Excitation Technique

Where possible, the procedures, sample specifications and calculations are consistent with these test methods. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

The damping behaviour originates from anelastical processes occurring in a strained solid i. Any specimen with a frequency response falling outside the prescribed frequency range is rejected. Test Methods CCCCCand C may differ from this test method in several areas for example; sample size, dimensional tolerances, sample preparation.

Material damping or internal friction is characterized by the decay e876 the vibration amplitude of the sample in free vibration as the logarithmic decrement. The measurement principle is e176 on tapping the sample with a small projectile and recording the induced vibration signal with a microphone or laser vibrometer. No other units of e176 are included in this standard.