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JIS B 7739:2011

JIS B 7739:2011

$31.20

Pendulum-type impact-testing machines for non-metallic materials – Verification of testing machines

Published By Publication Date Number of Pages
JIS 2011-03-22 59
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This Standard specifies the verification methods of the pendulum-type impact-testing machines used for the Charpy impact test, the Izod impact test and the tensile-impact test specified in JIS K 7111-1, JIS K 7111-2, JIS K 7110 and JIS K 7160, respectively.

Also Annex JA specifies the verification method of pendulum-type impact-testing machines used for the impact shear strength test of adhesive bonds specified in JIS K 6855.

This Standard is applicable to the pendulum-type impact-testing machines.

The impact energy W (see 3.12) absorbed in impacting a specimen is taken as being equal to the difference between the potential energy E (see 3.11) of the pendulum and the energy remaining in the pendulum after impacting the specimen.

On the calculation of the impact energy, the impact energy is corrected for the friction loss and the air-resistance loss (see table 2 and 5.6).

The verification methods of geometrical and physical properties of different parts of the testing machine are specified.

The verification of some geometrical properties is difficult to conduct on the assembled instrument.

It is therefore assumed that the manufacturer is responsible for the verification of such properties and for providing reference planes on the instrument that enable proper verification in accordance with this Standard.

These verification methods are for use when the testing machine is being installed, is being repaired, has been moved or is undergoing periodic checking.

This Standard is also applicable to pendulum -type impact-testing machines of different capacities or designs with the geometrical and physical properties defined in clause 5.

A pendulum -type impact-testing machine verified in accordance with this Standard and assessed as satisfactory is considered suitable for the impact-testing with unnotched and notched specimens of different types.

Annex A describes the relation among the pendulum length, the potential energy and the moment of inertia of the pendulum.

Annex B describes how to calculate the ratio of frame mass to pendulum mass required to avoid errors in the impact energy.

Annex C describes, for Charpy impact testing, the change in pendulum velocity just after impact as a function of impact energy and gives the measurement range of impact energies on which the pendulum of specified capacity is used.

Annex D describes the stiffness of the foundation of the frame necessary to avoid resonance in the frame due to the reaction force caused by the movement of the pendulum.

Annex E describes the shape and dimensions of a gauge plate suitable for the verification of Charpy impact-testing machines.

Annex JA describes the verification method of pendulum-type impact testing machines for shear strength of adhesive bonds.

Annex JB describes the gauge for shape inspection.

Annex JC is the comparison table between JIS and corresponding International Standard.

NOTE: The International Standard corresponding to this Standard and the symbol of degree of correspondence are as follows.

ISO 13802 : 1999 Plastics – Verification of pendulum impact-testing machines – Charpy, Izod and tensile impact-testing (MOD)

In addition, symbols which denote the degree of correspondence in the contents between the relevant International Standard and JIS are IDT (identical), MOD (modified), and NEQ (not equivalent) according to ISO/lEC Guide 21-1.

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JIS B 7739:2011
$31.20