Fatigue and/or crack growth test sample
AssigneeFractureLab, LLC
InventorRichard G. Pettit
Life of this patent
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Abstract
A sample for fatigue and/or crack growth testing, including an axisymmetric or cylindrical gage section with a concentric hole running from a first end, and terminating within the gage section, with one mode of loading introduced at the terminus of the hole, and reacted at the end where the hole originates. A second mode of loading is optionally introduced at a second end of the specimen. Use of the specimen is described in both in the context of an apparatus for fatigue/crack growth testing described in the referenced parent application, as well as with conventional test machines.
Claims9
A sample for fatigue and crack growth testing, comprising:
- (a) a length of the material to be tested comprising:
- (i) a first and second end;
- and
- (ii) an axisymmetric shape on the exterior over at least a portion of its length;
- and
- (b) a substantially circular hole extending from the first end of the sample along its longitudinal axis to a depth such that its terminus lies in the midst of the said axisymmetrically shaped portion, wherein:
- (i) the hole is concentric with said axisymmetric portion;
- and
- (ii) the hole has a constant diameter along at least a portion of its length in the vicinity of the terminus;
- and
- (iii) the region of the terminus of the hole forms a notched shape to initiate and/or grow cracks in the specimen under cyclic loading;
- and
- (c) at least two means of contacting a test machine capable of transmitting loads, wherein:
- (i) a first means introduces load in the vicinity of the terminus of the hole;
- and
- (ii) a second means introduces load at or near the first end of the sample, distributing load in a substantially axisymmetric manner around the sample axis.
Dependencies are inferred from the claim text.