AS 1544.1 pdf download – Methods for impact tests on metals Part 1: Izod

AS 1544.1 pdf download – Methods for impact tests on metals Part 1: Izod
1 sCOPE
This Standard specifies requirements for performing the lzod impact test on metals. It alsoincludes requirements for the installation of the testing machine，its initial and periodiccalibration, and recommendations for its maintenance by the user.
NOTE: The test piece may have a square, a rectangular or a circular section. Where a requirementinvolves reference to a face of a test piece, it applies directly to square or rectangular test piecesand by implication, to the corresponding portion of the surface of a circular test piece.
REFERENCED DOCUMENTS
The following documents are referred to in this Standard:AS
1544
Methods for impact tests on metals
1544.2Part 2:Charpy V-notch
1544.3Part 3: Charpy U-notch and keyhole notch1544.4Part 4:Calibration of the testing machine
1544.5Part 5: Assessment of fracture surface appearance of steel3 DEFINITIONS
For the purpose of this Standard, the definitions below apply.3.1 Centre of percussion
That point in a pendulum at which a blow, delivered in a tangential direction, will cause noreaction at the centre of rotation.
3.2Initial potential energy
The energy theoretically available in a pendulum-type impact testing machine when thependulum is returned from its striking position to its initial release position.
3.3Length of pendulum
The distance from the axis of rotation of the pendulum to the impact point of the pendulum,on a standard test piece.
3.4Point of impact
The midpoint of the line of contact between the striking edge and the test piece.3.5 Sample
A portion of material or a group of items selected from a batch or consignment by asampling procedure.
3.6Secondary standard test pieces
Charpy test pieces having an assigned impact value obtained from tests performed upon averified testing machine.
3.7Standardized test pieces
Charpy test pieces from a nationally recognized source which have certified impact valuesfor testing machine verification purposes.
3.8 Striking energy
The kinetic energy of the pendulum of the testing machine at the instant of impact.3.9 Striking velocity
The linear velocity of the striking edge at the instant of impact.3.10 Test piece
A prepared piece for testing, made from a test specimen by some mechanical operation.3.11Test specimen
A portion of material, or a single item taken from the sample, for the purpose of applying aparticular test.
3.12Verification
Proving of calibration procedures by testing of standardized test pieces.4 PRINCIPLE
The test piece is clamped vertically in supports with the notch in the same plane as theupper face of the support.The blow is struck on the face containing the notch and at a fixeddistance above it.Using a single blow from a pendulum to break a clamped notched testpiece using the energy absorbed by the material to determine the measurement.
5TESTING MACHINE
5.1General
The testing machine shall be of the pendulum type, and shall be so constructed that the lossof energy (such as from translation， rotation or vibration) in the machine framework andpendulum during a test, is negligible.
5.2Installation, calibration and maintenance
The machine shall be installed and calibrated in accordance with Paragraphs Al and A2 ofAppendix A. It shall be recalibrated periodically，and when otherwise necessary，inaccordance with Paragraph A2 of Appendix A.
The machine should be maintained in satisfactory working order and condition in theintervals between successive recalibrations, in accordance with Paragraph A3 ofAppendix A.
5.3 Test piece supports
The test piece supports shall be of hardened steel and shall consist of a support block and aclamp block, see Figures 1(a) and 1(b).
The support block shall be provided with a vertical groove for locating the test piece in theplane of the swing of the pendulum. The location groove shall conform to the requirementsof Table 1 and the following requirements:
(a)For square-section and rectangular test pieces the groove shall have a clearance space
at the top and relieving recesses at the corners.