ISO 204:2009 pdf free download – Metallic materials – Uniaxial creep testing in tension一Method of test.
— test results;
— position of the rupture (when outside of central two thirds of the parallel length):
percentage initial plastic elongation;
— conditions of accidental interruptions and resumptions of the test:
— any occurrence which can affect the results, for example. deviations from the specified tolerances.
12.3 Information to be available on request (made at the time of order) may iidude, when applicable:
— machine type (sample machine, multiple machine with test pieces in line, etc.):
force application time, elongation-lime diagram with sufficient recordings to accurately construct the diagram;
percentage elastic elongation due to the application of the force (see 84.2):
percentage elastic and anelastic elongation due to unloading and the unloading time (see 8.4.2):
— information concerning the recorded values of any indicated temperature excursions outside the permitted temperature limits defined in 6.3.1:
tipe of extenson’ieter;
— value of the drift of the thermocouples over the test period:
— see also E.6 for recommended additional information regarding the sample material.
12.4 The test conditions and limits defined in this International Standard shall not be adjusted to take account of uncertainties of measurement, unless specifically instructed otherwise by the customer (see Annex D).
12.5 The estimated measurement uncertainties shall not be combined with test results to assess compliance with product specifications, unless specifically instructed otherwise by the customer (see Annex D).
C.1 General
Circumferentially notched test pieces may be employed in tensile creep testing to provide either
a) the material response to a feature that introduces a significant stress concentration, e.g. a sharp change in section of a component such as the root of a thread, or
b) the response of the material under a multi-axial stress state.
The former (a) may be evaluated using a V notch geometry as discussed in C.2, whilst the latter may be achieved using blunt, or semi-circular circumferential notches as discussed in C.3.
C.2 V-notched test pieces
The use of circumferential V-notched test pieces has long been used to determine a material’s response to features such a threads in components, both in tensile and creep testing. Frequently, a combined test piece geometry was employed having a parallel shank region with the same cross-sectional area as that across the throat of a notch machined into a larger diameter portion of the same test piece (see Figure C.1). Such test pieces were primarily used to determine whether the material ‘notch strengthened’, i.e. fractured in the plain shank region first, or ‘notch weakened’, i.e. fractured across the notch. Clearly, the magnitude of the notch strengthening or weakening effect could not be quantified from the use of the combined test piece geometry and if such information is required it is necessary to test separately plain and notched test pieces under the same net section stress.