IN-SITU DEFORMED SPECIMEN GRATING REPLICATION TECHNIQUE IN MOIRE INTERFEROMETRY

High-sensitivity moire interferometry with the in situ deformed gratin g replication technique is adopted to investigate the deformations of a nickel-based polycrystal superalloy under uniaxial tensile loading. By multiple replication of several desired loading levels and observin g them in moire interferometry, nearly real time deformation measureme nts can be conducted flexibly even when the testing machine is far awa y from the optical set-up. As an alternative to deformed specimen grat ing replication caused by mechanical loading, a thermally induced defo rmed specimen grating can also be replicated at an elevated temperatur e and deformation fields can be obtained by observing the replicated p ieces in moire interferometry at room temperature. Thermally induced d eformations of a microelectronic assembly are given as an example.