BS ISO 6721-9 pdf free download

BS ISO 6721-9-2019 pdf free download.Plastics – Determination of dynamic mechanical properties – Part 9: Tensile vibration一Sonic-pulse propagation method.
This document describes a pulse propagation method for determining the storage component of the complex tensile modulus E’ ofpolymers at discrete frequencies typically in the range 3 k[Iz to 10 kHz. The method is suitable for measuring materials with storage moduli in the range 0,01 GPa to 200 GPa and with Loss factors below 0,1 at around 10 kHz. With materials having a higher loss, significant errors in velocity measurement are introduced through decay of amplitude.
The method allows measurements to be made on thin films or fine fibres and long specimens, typically tapes of 300 mm x 5 mm x 0,1 mm or fibres of 300 mm x 0,1 mm (diameter).
This method may not be suitable for cellular plastics, composite plastics and multilayer products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition ofthe referenced document (including any amendments) applies.
ISO 1183-1. Plastics — Methodsfor determining the density ofnon-cellular plastics — Part 1: immersion method, liquid pycnometer method and titration method
ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient column method
ISO 1183-3. Plastics — Methods for determining the density of non-cellular plastics — Part 3: Gas pyknometer method
ISO 6721-L Plastics — Determination of dynamic mechanical properties — Part 1: General principles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6721-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 longitudinal sonic pulse
single sonic pulse where the deformations coincide with the direction of propagation of the pulse
5.4 Pulse arrival time measuring equipment
This instrument shall be capable of measuring the time interval between two pulses, one from transducer drive unit and the other from receiving transducer to an accuracy of± 0,5 is.
NOTE The time interval will depend upon the distance between the transmitting and receiving transducers and the sonic wave velocity in the material.
5.5 Temperature measurement and control equipment
According to ISO 672 1-1.
6 Test specimens
6.1 General
The test specimens shall be in accordance with ISO 672 1-1.
6.2 Shape and dimensions
Test specimens in the form of a thin film or fibre are suitable. The dimensions are not critical, however, specimens 200 mm to 500 mm in length, 1 mm to 10 mm in width, and 0,1 mm to 1 mm in thickness or diameter are suitable.
6.3 Preparation
According to ISO 672 1-1.
7 Number of specimens
According to ISO 672 1-1.
8 Conditioning
According to ISO 672 1-1.
9 Procedure
9.1 Test atmosphere
According to ISO 672 1-1.
9.2 Mounting the specimen
Place a test specimen in the apparatus so that the received pulse has a suitable amplitude to determine its arrival time. Poor contact between the test specimen and the transducers makes the pulse energy inadequate for determining the sonic pulse propagation time.
For not rigid specimens, apply a small tension to the specimen to make it tight, but not stretched.BS ISO 6721-9 pdf download.