SM & T Standards Measurement & Testing Project No. SMT4-CT97-2165 UNCERT COP 04: 2000 Manual of Codes of Practice for the Determination of Uncertainties in Mechanical Tests on Metallic Materials Code of Practice No. 04 The Determination of Uncertainties in Critical Crack Tip Opening Displacement (CTOD) Testing L.M. Plaza INASMET Centro Tecnológico de Materiales Camino de Portuetxe, 12 ES-20009 San Sebastián SPAIN Issue 1 September 2000