ISO 148-1-2016 pdf free.Metallic materials一Charpy pendulum impact test一Part 1: Test method.
8.3.1 Unless otherwise specified, tests shall be carried out at 23 °C ± 5 °C (ambient temperature). If a temperature is specified, the test piece shall be conditioned to a temperature within ±2 °C.
8.3.2 For conditioning (heating or cooling) using a liquid medium, the test piece shall be positioned in a container on a grid that is at least 25 mm above the bottom of the container and covered by at least 25 mm of liquid, and be at least 10 mm from the sides of the container. The medium shall be constantly agitated and brought to the specified temperature by any convenient method. The device used to measure the temperature of the medium should be placed in the centre of the group of test pieces. The temperature of the medium shall be held at the specified temperature within ±1 °C for at least 5 mm.
NOTE When a liquid medium is near its boiling point, evaporative cooling can dramatically lower the temperature of the test piece during the interval between removal from the liquid and fracture.IBi
8.3.3 For conditioning (heating or cooling) using a gaseous medium, the test piece shall be positioned in a chamber at least 50 mm from the nearest surface. Individual test pieces shall be separated by at least 10 mm. The medium shall be constantly circulated and brought to the specified temperature by any convenient method. The device used to measure the temperature of the medium should be placed in the centre of the group of test pieces. The temperature of the gaseous medium shall be held at the specified temperature within ±1 °C for at least 30 mm before the test piece is removed from the medium for testing.
8.3.4 Other methods for heating or cooling are allowed, if the other pertinent requirements of & are fulfilled.
8.4 Specimen transfer
When testing is performed at other than ambient temperature, not more than 5 s shall elapse between the time the test piece is removed from the heating or cooling medium and the time it is impacted by the striker. An exception is made if the difference between the ambient or instrument temperature and the test piece temperature is less than 25 °C, in which case the time for specimen transfer shall be less than lOs.
The transfer device shall be designed and used in such a way that the temperature of the test piece is maintained within the permitted temperature range.
The parts of the device in contact with the specimen during transfer from the medium to the machine shall be conditioned with the specimens.
Care should be taken to ensure that the device used to centre the test piece on the anvils does not cause the fractured ends of low-energy, high-strength test pieces to rebound off the device into the pendulum. This pendulum/test piece interaction results in erroneously high indicated energy. It has been shown that clearance between the end of a test piece in the test position and the centring device, or a fixed portion of the machine, shall be equal to or greater than 13 mm to avoid the ends of the test pieces rebounding into the pendulum during the test.
NOTE Self-centring tongs, similar to those shown in Annex A for V-notched test pieces, are often used to transfer the test piece from the temperature-conditioning medium to the proper test position. Tongs of this nature eliminate potential clearance problems due to interference between the fractured specimen halves and a fixed centring device.
8.5 Exceeding machine capacity
The absorbed energy, K, should not exceed 80 % of the initial potential energy, K. lithe absorbed energy exceeds this value, the absorbed energy shall be reported as approximate and it shall be noted in the test report as exceeding 80 % of the machine capacity.
NOTE Ideally, an impact test would be conducted at a constant impact velocity. In a pendulum-type test, the velocity decreases as the fracture progresses. For specimens with impact energies approaching the capacity of the pendulum. the velocity of the pendulum decreases during fracture to the point that accurate impact energies are no longer obtained.
8.6 Incomplete fracture
Test pieces do not always break into two pieces during the test.
For material acceptance testing, it is not required to report information concerning incomplete fracture.
For tests, other than material acceptance testing, it is required that unbroken test pieces are reported.ISO 148-1 pdf free download.
Tags: Metallic materials
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