High Temperature Vibratory Response of Hastelloy-X: Stereo-DIC Measurements and Image Decomposition Analysis

Abstract

The mechanical behavior of solids in combined high-temperature and vibratory environments, such as those experienced during hypersonic flight, are historically not well explored. In this work on Hastelloy-X plates, elevated temperatures were achieved by induction heating and periodic vibratory loading was applied using a shaker. Surface displacements and strains were measured using stereo digital image correlation (DIC) in the blue spectrum to alleviate issues associated with thermal radiation. Through the use of image decomposition techniques the resultant high-quality experimental data were used to validate numerical simulations of combined thermoacoustic loading. The simulations were based on the deformed shape and the corresponding temperature distributions measured experimentally as well as taking into account the thermal dependence of Hastelloy-X mechanical properties.

Modal Parameters Evaluation in a Full-Scale Aircraft Demonstrator under Different Environmental Conditions Using HS 3D-DIC

“…Results of these differences are presented as percentages in Figure 17 , considering the non-pressurized state as a reference. The first three shape descriptors were omitted since they represent rigid body translation and rotation [ 22 ]. Hence, the focus was placed on the local deformation of the window.…”

“…The characterization of full-field mode shapes and operational deflection shapes (ODS) is one of the most interesting features using HS 3D-DIC. Sinusoidal signals whose frequency corresponds to a resonance of the system is employed for this purpose [ 11 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. Besides, employing a broadband excitation instead of a fixed sine the full-field response of the specimen is registered, and frequency response functions (FRF) or other frequency domain transfer function are easily obtained.…”

“…By analyzing the peaks that maximize the response it is possible to estimate the natural frequencies and the damping ratios [ 12 , 13 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ]. Special interest presents those studies that employ image decomposition approaches [ 17 , 18 , 22 , 25 , 32 , 33 ] to reduce the full-field information to just a few shape descriptors [ 34 , 35 , 36 , 37 ]. In these works, it was demonstrated that HS 3D-DIC is valid for different materials, such as steel, aluminum, composites, and polymers.…”

Modal Identification in an Automotive Multi-Component System Using HS 3D-DIC

“…Both features are especially interesting considering the 3D distribution and the shape complexity of the components of a lighting system. Different studies have tested the capabilities of HS DIC in the characterization of mode shapes by forcing a single resonance [ 5 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. Full modal characterizations, i.e., for the three modal parameters, were already performed [ 6 , 7 , 17 , 18 , 19 , 20 , 21 ], using frequency response functions (FRF).…”

Centrosymmetric 3D Deformation Measurement using Grid Method with a Single-Camera

“…Since Barnard proposed computer vision technology [14] in 1982, many measurement methods for 3D deformation have been developed and applied in measuring different types of highspeed deformation and dynamic mechanical performance. These applications include random nonlinear dynamic response [15], simulation of artificial wing modal analysis of an underwing beetle [16], high-speed impact [17][18][19], and Hastelloy-X high-temperature vibration response [20]. However, system errors caused by the non-synchronization of the acquisition time are inevitable because of the use of a pair of high-speed cameras.…”