BS 6980-5(1990) : 1990 AMD 1995

Committees responsible
National foreword
Method
1 Scope
2 Normative references
3 Definitions
4 Principle
5 Specimens
6 Procedure
7 Assessment of results
8 Test report
Annex
A Formula for calculating stressing of C-ring
     specimens
Table
A.1 Deflection delta D for a C-ring of nominal 19 mm
     outside diameter and 1,50 mm wall thickness of
     alloy with a modulus of elasticity of 100 000 MN/m2
     for stressing to 500 MN/m2
Figures
1 Sampling procedure for testing procedures
2 Example of C-ring specimen
3 Methods of stressing C-rings
4 Suitable jig for the placement of a wedge opening
     insert
5 Protection against crevice corrosion and galvanic
     effects
A.1 Correction factor for curved beams

This covers procedures for designing, preparing, stressing, exposing and inspecting C-ring test specimens for investigating the susceptibility of a metal to stress corrosion. Analysis of the state and distribution of stress in the C-ring is presented. The C-ring is a versatile, economical specimen for determining the susceptibility to stress corrosion cracking of all types of metals in a wide variety of product forms including parts joined by welding. Suitable for tests of tube, rod and plate. Notched specimens may also be used. C-ring specimens may be stressed to predetermined levels, using simple equipment for application of either constant load or constant strain.