Patent ID: 7150200

Claim:
A tensile specimen comprising: an axisymmetric first end section; an axisymmetric second end section; an axisymmetric gauge section positioned centrally between said axisymmetric first end section and said axisymmetric second end section, wherein said axisymmetric first end section adjoins said axisymmetric gauge section by a first variable curvature transition fillet, and wherein said axisymmetric second end section adjoins said axisymmetric gauge section by a second variable curvature transition fillet, wherein said tensile specimen has a surface stress concentration factor close to unity (1.0); a first threaded portion positioned substantially near a free end of said axisymmetric first end section; and a second threaded portion positioned substantially near a free end of said axisymmetric second end section; wherein a maximum said surface stress concentration factor is 1.01, a length of said MAST specimen is 1.0 inch and a diameter of said axisymmetric gauge section is 0.080 inch.