ISO 179-2-1997 pdf download – Plastics – Determination of Charpy impact properties – Part 2: Instrumented impact test.
2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of IS0 179. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 179 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 1 79-1 :-‘I, Plastics – Determination of Charpy impact properties – Pati 1: Non-instrumented impact test. IS0 1 3802:2) , Plastics – Verification of pendulum impact-testing machines – Chapy, Izod and tensile impact testing. 3 Definitions For the purposes of this part of IS0 179, the definitions given in part 1 apply, together with the following: 3.1 impact velocity, VO: The velocity of the striker relative to the test specimen supports at the moment of impact. It is expressed in metres per second (m/s). 3.2 inertial peak: The first peak in a force-time or force-deflection diagram. It arises from the inertia of that part of the test specimen accelerated after the first contact with the striker (see figure 1 , curve b, and annex A). 3.3 impact force, F: The force exerted by the striking edge on the test specimen in the direction of impact. It is expressed in newtons (N). 3.4 deflection, s: The displacement of the striker relative to the test specimen supports after impact, starting at first contact between striker and test specimen. It is expressed in millimetres (rnm). 3.5 impact energy, W The energy expended in accelerating, deforming and breaking the test specimen during the deflection s. It is expressed in joules (J). It is measured by integrating the area under the force-deflection curve from the point of impact to the deflection s. 3.6 maximum impact force, FM: The maximum value of the impact force in a force-time or force-deflection diagram (see figure 1). It is expressed in newtons (N).