Hi Dave

Interpolate. The 20MPa is well within the measured range. However, I agree with Jean Paul that the NCMS data should be used mainly in 
a comparative manner. 
I believe there are not enough data for modelling the  deformation behaviour (or the deep understanding) that allow direct comparison  to data from other test setups. Looking at the data of NPL on their homepage I even saw that the shear axis is assigned with rad which implies a torsion test that has it's problems in comparing the data with a single lap shear  setup again

Best regards

Guenter

EMPA
Swiss Federal Laboratories  for Materials Testing and Research
Centre for Reliability
Guenter Grossmann,  Senior Engineer

8600 Duebendorf
Switzerland

Phone: xx41 1 823 4279
Fax :     xx41 1 823 4054
mail:     [log in to unmask]

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