BS ISO 29221:2014

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Test specimen
7 Procedure
8 Calculation and validation of results
9 Precision
10 Test report
Annex A (informative) - Determination of the initial
        crack length, a[o], when using the chevron notch
Annex B (informative) - Procedure for measuring
        the arrested crack length (a[o])
Annex C (informative) - Fracture surface acceptability
Annex D (informative) - Comment on precision statement
Bibliography

Defines a method for the determination of the plane-strain crack-arrest fracture toughness, K[Ia], of polymeric materials by the use of a side-grooved, crack-line-wedge-loaded compact tension specimen to obtain a rapid run-arrest segment of flat-tensile separation with a satisfactory crack front.

This International Standard specifies a method for the determination of the plane-strain crack-arrest fracture toughness, K_la, of polymeric materials by using a side-grooved, crack-line-wedge-loaded compact tension specimen to obtain a rapid crack run-arrest segment of flat-tensile separation with a satisfactory crack front. This International Standard employs a static fracture analysis determination of the stress intensity factor at a short time after crack arrest. The estimate is denoted as K_a and when certain size requirements are met, the test result provides an estimate, termed as K_la, of the plane-strain crack-arrest toughness of the polymer. The specimen size requirements provide for in-plane dimensions large enough to allow the specimen to be modelled by linear elastic analysis. If the specimen does not exhibit rapid crack propagation and arrest, K_a cannot be determined.