BS 2782-3:Method 323B:1996:2007 Edition
$102.76
Methods of testing plastics – Mechanical properties – Flexural vibration. Non-resonance method
| Published By | Publication Date | Number of Pages |
| BSI | 2007 | 16 |
This part of ISO 6721 describes a flexural, non-resonance method for determining the components of the Young’s complex modulus E* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz. !Higher-frequency measurements can be made, but significant errors may be obtained in the dynamic properties measured (see 10.2.1 and 10.2.2).” The method is suitable for measuring dynamic storage moduli in the range 10 MPa to 200 GPa. Although materials with moduli less than 10 MPa may be studied, more accurate measurements of their dynamic properties can be made using shear modes of deformation (see part 6 of ISO 6721).
This method is particularly suited to the measurement of loss factors greater than 0,1 and may therefore be conveniently used to study the variation of dynamic properties with temperature and frequency through most of the glass-rubber relaxation region (see ISO 6721-1:1994, subclause 9.4). The availability of data determined over wide ranges of both frequency and temperature enables master plots to be derived, using frequency/temperature shift procedures, which present dynamic properties over an extended frequency range at different temperatures.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 1 | BRITISH STANDARD BS 2782-3: Method 323B:1996 ISO 6721-5: 1996 Methods of testing Plastics – Part 3: Mechanical properties – Method 323B: Flexural vibration – Non-resonance method ICS 83.080 |
| 2 | This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 December 1996 National foreword |
| 3 | Contents |
| 7 | Foreword Foreword to amendment 1 |
| 9 | 1 Scope 2 Normative references 3 Definitions 4 Principle 5 Apparatus 5.1 Loading assembly |
| 10 | 5.1.1 Load stage 5.1.2 Transducers 5.2 Electronic data-processing equipment 5.3 Temperature measurement and control 5.4 Devices for measuring test specimen dimensions 6 Test specimens 6.1 Shape and dimensions 6.2 Preparation 7 Number of specimens 8 Conditioning 9 Procedure 9.1 Test atmosphere 9.2 Measuring the cross-section of the specimen 9.3 Clamping the specimen |
| 11 | 9.4 Varying the temperature 9.5 Performing the test 10 Expression of results 10.1 Symbols |
| 12 | 10.2 Calculation of Young’s storage modulus E’ 10.2.1 Avoidance of specimen resonance 10.2.2 Correction for transducer resonance |
| 13 | 10.2.3 Correction for apparatus compliance 10.2.4 Application of a length correction 10.3 Calculation of the Young’s loss factor tan dE 10.4 Calculation of the Young’s loss modulus 10.5 Presentation of data as a function of temperature 11 Precision 12 Test report |
| 14 | Figure 1 – Schematic diagrams of suitable loading assemblies for determining dynamic moduli under flexure |
| 15 | Figure 2 – Schematic diagram of an alternative loading assembly for determining dynamic flexural moduli, employing measurement of the current to the vibrator to determine the force on the specimen |
| 16 | BS 2782-3: Method 323B:1996 ISO 6721-5: 1996 |
