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Structural Engineering and Mechanics
  Volume 75, Number 3, August10 2020, pages 369-376
DOI: http://dx.doi.org/10.12989/sem.2020.75.3.369
 


Damage detection of 3D printed mold using the surface response to excitation method
Shervin Tashakori, Saman Farhangdoust, Amin Baghalian, Dwayne McDaniel, Ibrahim N. Tansel and Armin Mehrabi

 
Abstract
    The life of conventional steel plastic injection molds is long but manufacturing cost and time are prohibitive for using these molds for producing prototypes of products in limited numbers. Commonly used 3D printers and rapid prototyping methods are capable of directly converting the digital models of three-dimensional solid objects into solid physical parts. Depending on the 3D printer, the final product can be made from different material, such as polymer or metal. Rapid prototyping of parts with the polymeric material is typically cheaper, faster and convenient. However, the life of a polymer mold can be less than a hundred parts. Failure of a polymeric mold during the injection molding process can result in serious safety issues considering very large forces and temperatures are involved. In this study, the feasibility of the inspection of 3D printed molds with the surface response to excitation (SuRE) method was investigated. The SuRE method was originally developed for structural health monitoring and load monitoring in thin-walled plate-like structures. In this study, first, the SuRE method was used to evaluate if the variation of the strain could be monitored when loads were applied to the center of the 3D printed molds. After the successful results were obtained, the SuRE method was used to monitor the artifact (artificial damage) created at the 3D printed mold. The results showed that the SuRE method is a cost effective and robust approach for monitoring the condition of the 3D printed molds.
 
Key Words
    3D printed mold; structural health monitoring; damage detection; composites; inspection, SuRE
 
Address
Shervin Tashakori, Amin Baghalian, Ibrahim N. Tansel; Department of Mechanical & Materials Engineering, Florida International University, Miami, FL, USA
Saman Farhangdoust and Armin Mehrabi: Department of Civil and Environmental Engineering, Florida International University, Miami, FL, USA
Dwayne McDaniel: Applied Research Center, Florida International University, Miami, FL, USA
 

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