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Failure during Fatigue Testing of Metal 3D Printed Objects
Shimadzu Review 81[1・2] (2024)
Abstract
Mechanoluminescent materials are ceramic particles that have the ability to repeatedly emit light in response to mechanical stimuli such as compression and tension. Various research groups are working on attaching mechanoluminescent materials to the surface of test objects and using the light emitted by the mechanoluminescent materials when external forces are applied to the test object to determine the mechanical properties of the test object.
Mechanoluminescent materials only emit light when in an excited state and must be irradiated with excitation light to achieve this excited state. However, this excitation process typically cannot be carried out at the same time as measuring mechanoluminescence, as the mechanoluminescent signal is of very low intensity and drowned out by the excitation signal. This shortcoming has hindered using mechanoluminescent materials to visualize phenomena that occur intermittently and unpredictably.
We have devised a technique allowing the acquisition of high high-contrast mechanoluminescent images while simultaneously irradiating the mechanoluminescent material with excitation light. This technique involves adding an optical filter to the light measurement system and applying appropriate image processing to the recorded signals. This article reports on using this technique to successfully visualize apparent signs of failure during fatigue fracture testing of metal 3D printed objects.
1Research & Development Department, Analytical & Measuring Instruments Division, Shimadzu Corporation, Kyoto, Japan
2Kobe Material Testing Laboratory Co.,Ltd., Hyogo,Japan
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