On the validity of the Tada stress intensity factor solution for the single edge notch tension specimen with pinned ends.

• The validity of the K Tada solution for the pinned SEN(T) is evaluated. • Measured da/dN reductions demonstrate that the true K can deviate below K Tada. • FE calculations quantify the influence of non-linear geometry effects on K Tada. • Most pinned SEN(T) data are valid due to low a/W, low K Tada , and high alloy modulus. • A new K solution is needed to cover broader ranges of a/W, load, and alloy modulus. The validity of the Tada stress intensity factor (K Tada) for pinned-ends single edge notch tension [SEN(T)] specimens is assessed via a combined experimental-modeling approach. Analysis of fatigue crack growth rate reductions during constant-ΔK Tada loading demonstrates that specific combinations of alloy stiffness, geometry, and loading result in the true K deviating below K Tada. Geometrically non-linear, 3-dimensional finite element calculations confirm mild-to-strong influences of these parameters, which are not captured by K Tada. Most existing pinned SEN(T) data are found to use parameters where K Tada is not significantly reduced, but the present results underscore the need for a more broadly applicable K solution. [ABSTRACT FROM AUTHOR]