Abstract
In order to study the strength of the composite material plate problems, need to adopt a nondestructive testing method to obtain the specimen surface under the effect of high-speed impact regularity of shape. The projection profilometry was used to measure the surface profile or the full field deformation. Furtherly, by using the Fourier transform algorithm, there is only one frame of captured image which is needed in the measurement, so that it can be introduced into the high speed impaction procedure measurement. An experimental system, which was contained with an impact setup and the projection profilometry measurement part, was constructed for the impaction action characteristic research. The metallic impact object can be launched by a gas gun or a spin fan, respectively. The detected object is manufactured by composite materials. In order to increase the surface deformation measurement accuracy, the calibration method and the error was discussed with different calibration specimen. And then, the proposed profilometry measurement method is proved by the gas gun and spin fan projectile test. The surface deformation of the manufactured composite plates and fan case are measured in the impaction procedure. So that the impact action details can be described much more clearly than the traditional video monitoring method.
Highlights
IntroductionIn the active3-D shape measurement, a regular pattern [6], such as a well-defined array of lines, is adhered to the measured sample’s surface, and an image of this grid is obtained before and after deformation
By using the Fourier transform algorithm, there is only one frame of captured image which is needed in the measurement, so that it can be introduced into the high speed impaction procedure measurement
The high-speed Charge Coupled Device (CCD) camera is fixed normal to the reference plane, and the distance between the camera and the detected object depends on the size of the composite plate and the parameter
Summary
In the active3-D shape measurement, a regular pattern [6], such as a well-defined array of lines, is adhered to the measured sample’s surface, and an image of this grid is obtained before and after deformation. In the projection grating profilometry of a dynamic impaction measurement, the parallel with cosine function modulated intensity is projected onto the detected object. The mainly two kinds of phase extracting methods are phase-shifting measurement profilometry (PMP) and Fourier transformation profilometry (FTP). Only one image can be obtained in the dynamic measurement, so the Fourier transform technique is used to extract the phase information [10] [11] [12] [13]. The projection profilometry and the Fourier transform method are introduced into the surface deformation inspection of the manufactured composite plates. Some interesting experimental results are present to prove the feasibility of the proposed method
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