ASTM A956 PDF

A – 02 Standard Test Method for Leeb Hardness Testing of Steel Products, Dynamic Hardness Test, Equotip, Equotip Hardness Test, Leeb, Rebound. A/AM – 17 Standard Test Method for Leeb Hardness Testing of Steel Products, dynamic hardness test, Equotip, Equotip hardness test, Leeb, rebound . ASTM A – Download as PDF File .pdf), Text File .txt) or read online.

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The Leeb hardness value aatm read on the indicator device. Furthermore, the L value depends on the geometry of the indenter and its material properties, predominantly hardness and elasticity.

Impact Device 65 6. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.

The results generated at that location do not represent the part at any other surface location and yield no information about the material at subsurface locations. The impact and rebound velocities are measured when the impact body is approximately 1 mm from the test surface. Test pieces of weights less than the minimum or pieces of any weight with sections less than the minimum thickness require rigid support and coupling to a thick, heavier non-yielding surface to resist the impact of the device.

This is a measure for the velocity of the impact body: Any instrument not meeting the requirements of Part B shall not be employed for the acceptance testing of product.

Historical Version s – view previous versions of standard. Impact Device G max. Eight laboratories tested five certified test blocks. Coarse finishes will tend to lower the measured value. The following guidelines are offered as minimum weights and sizes of test pieces for selecting the proper test equipment. The impact and rebound velocities are assumed to be proportional to the extremal values A and B of the signal curve, which is a good approximation, if the device is constructed so, that the extremals are near the signal step caused by the impact.

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Both effects lead to a change in impact energy.

ASTM A – 02 Standard Test Method for Leeb Hardness Testing of Steel Products

Impact bodies show minimal wear even at high hardness levels when compared to D device. The indicated value is automatically replaced with the next test impact result.

Any instrument aa956 meeting the requirements of Part B shall not be employed for the acceptance testing of product. The respective standard deviations among test results, related to the above numbers by the factor 2.

Impact bodies show no fading even xstm high hardness levels compared to D device.

ASTM A956-06.pdf

Summary of Test Method 4. The other types have been added with the time for applications with special requirements.

Device C LC Device DL LDL -3 -3 -2 -2 -2 -1 -1 -1 -2 -3 -6 -2 -4 -7 -3 -5 -9 -3 -6 -4 -7 -5 -8 -5 -9 -6 Failure to provide adequate support and coupling will produce test results astj than the true hardness value.

Permission rights to photocopy the s956 may also be secured from the ASTM website www. It is of advantage to arrange the impact body magnets and the coil so that the impact signal as well as the rebound signal uses at least two zero transitions in this case 3 of the induced voltage as support points for the evaluation of the curve.

Applications on walled or impact sensitive components small measuring indentation too. Failure to provide adequate surface finish will produce questionable test results.

Special applications in very confined spaces like holes, cylinders or measurements inside of assembled machines and constructions. Uniformity of Hardness Calibration using a single standard test block may indicate acceptable results, but additional calibration tests asmt blocks of differing hardness may yield unacceptable results. A number in parentheses indicates the year of last reapproval.

Requires less surface finish than impact device D for accurate readings. In order to reproduce the standard direction dependency, it is necessary to specify velocity and mass separately and to have a specific asmt flight length.

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If the material being tested is considered to be nonhomogeneous for example. We are a non-profit group that run this website to share documents. Please help us to share our service with your friends. Only the mass must be kept within narrow tolerances. The quotient of these measured voltage values derived from the impact and rebound velocities, multiplied by the factor produces a number which constitutes the Leeb hardness value.

Any instrument not verified shall not be used for testing without repair and re-verification. The impact device, while not in contact with the test piece, is held firmly with one hand and the charging tube is depressed with the other hand until contact is felt. A number in parentheses indicates the year of last reapproval.

Applications for measurement in the high end range. The Leeb hardness test is of the dynamic or rebound type, which primarily depends both on the plastic and on the elastic properties of the material being tested.

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Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Leeb and Equotip are registered trademarks used with permission of Proceq SA. Impact Device DL max. Furthermore, small differences, caused by production, in potential energy of the impact a596 in the tensioned state are asstm. This is accomplished by means of a permanent magnet mounted in the impact body which, during the test, moves through a coil in the impact device and induces an electric voltage on both the impact and rebound movements.

Originally approved in For the definition of some of the parameters refer to Fig.

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