en.Wedoany.com Reported - The DIC strain measurement system is a tool for studying the mechanical behavior of nickel-based alloy thin sheets under impact deformation at 120°C, capable of providing full-field displacement and strain details. The research utilized the XTDIC DIC strain measurement system from Newopto 3D to conduct punch impact deformation tests on nickel-based alloy (GH3044) thin sheets at specific temperatures. It obtained the full-field displacement and strain of the specimens, revealing the deformation patterns of the samples in a high-temperature environment of 120°C. This DIC strain measurement system is based on the principle of digital image correlation. It uses industrial CCD cameras to continuously capture the deformation of the specimen and calculates the displacement and strain fields by comparing images before and after deformation.

The test employed the principle of the Erichsen cupping test to design a measurement scheme for the force-induced deformation of thin sheets, simulating the collision of thin sheets by a specific-shaped object at 120°C. After calibration, the accuracy of this DIC strain measurement system can reach 0.001mm, making it suitable for thin sheet deformation measurement. The test material is GH3044, primarily used in aero-engine heat shields, guide vanes, etc. The specimens were divided into three groups: Group A at room temperature, Group B at 120°C, and Group C at 150°C. The punch was made of SKH-9 high-speed steel with a hardness of 65 HRC, featuring a flat front end with rounded corners. During the test, the data from Group B specimens were representative. The measurement results from the DIC strain measurement system showed that the deformation of the specimens under heating conditions significantly increased compared to room temperature, with substantial improvements in both displacement and strain. Among the displacement changes, the z-direction displacement was dominant, while among the strain changes, the y-direction strain was dominant. Temperature had a noticeable effect on the deformation amount of the specimens; the higher the temperature, the greater the deformation. When the total displacement reached its maximum, the deformation area of the specimen under the selected seed points reached 100%. Analysis using the DIC strain measurement system indicated that for a temperature difference of 30°C, the total displacement and principal strain differed by 1.047 mm and 1.002%, respectively.

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