US 11,703,482 B2
Computing progressive failure in materials and structures by integration of digital image correlation with acoustic emission monitoring data
Antonios Kontsos, Philadelphia, PA (US); Ivan Bartoli, Ardmore, PA (US); and Prashanth Abraham Vanniamparambil, Philadelphia, PA (US)
Assigned to Drexel University, Philadelphia, PA (US)
Filed by Drexel University, Philadelphia, PA (US)
Filed on Jun. 7, 2021, as Appl. No. 17/340,157.
Application 17/340,157 is a continuation of application No. 16/120,355, filed on Sep. 3, 2018, abandoned.
Application 16/120,355 is a continuation of application No. 14/516,708, filed on Oct. 17, 2014, granted, now 10,488,368, issued on Nov. 26, 2019.
Application 14/516,708 is a continuation in part of application No. PCT/US2013/037252, filed on Apr. 18, 2013.
Claims priority of provisional application 61/635,282, filed on Apr. 18, 2012.
Prior Publication US 2021/0302381 A1, Sep. 30, 2021
This patent is subject to a terminal disclaimer.
Int. Cl. H04N 13/246 (2018.01); G01N 29/14 (2006.01); G01M 5/00 (2006.01); G01N 21/88 (2006.01); G06T 7/00 (2017.01)
CPC G01N 29/14 (2013.01) [G01M 5/0066 (2013.01); G01M 5/0091 (2013.01); G01N 21/8803 (2013.01); G06T 7/0008 (2013.01); H04N 13/246 (2018.05); G01N 2291/0232 (2013.01); G01N 2291/0258 (2013.01); G06T 2207/10012 (2013.01); G06T 2207/30108 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A nondestructive method of determining the structural integrity of a specimen as a load is applied to the specimen, the method comprising the steps of:
attaching at least one acoustic emission sensor to the specimen;
applying a contrasting pattern on the surface of the specimen;
aiming a pair of stereoscopic cameras at the contrasting pattern;
passively recording acoustic stress waves propagating in the specimen in an Acoustic Emission (AE) system electronically coupled to the at least one acoustic emission sensor;
time synchronizing cumulative energy calculated from the AE data with information about the load;
triggering operation of the cameras by the AE system;
adaptively recording data generated by operation of the cameras;
measuring deformation in the specimen based on load-induced movement of the contrasting pattern in a Digital Image Correlation (DIC) system, the DIC system being electronically coupled to the cameras; and
correlating stress waves travelling through the specimen measured by the at least one acoustic emission sensor with strain data measured on a surface of the specimen to compute a Mahalanobis distance of the specimen.