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Tensile Behavior of 3D Printed Specimens by Small Punch Test
Bum Joon Kim
J. Korean Soc. Precis. Eng. 2025;42(10):879-884.
Published online October 1, 2025
DOI: https://doi.org/10.7736/JKSPE.025.121

The purpose of this study is to evaluate the deformation behavior of 3D printed specimens using the small punch tensile test method. Traditional tensile tests for assessing mechanical properties require a significant amount of material to produce uniaxial tensile specimens. In contrast, the small punch test method only requires 10 x 10 x 0.5 mm (width x length x thickness) thin plate specimens, providing a substantial economic advantage in specimen sampling and production. This method is particularly beneficial when it is impossible to produce specimens of the same size as uniaxial specimens, as it allows tensile testing with just the minimum sample required. In this study, we utilized fused deposition modeling 3D printing and considered various 3D printing parameters, such as layer height and volume fraction, while manufacturing the specimens. We then compared and analyzed the effects of these variables on tensile strength as measured by the small punch tensile test. Furthermore, we focused on investigating the applicability of this method to the deformation behavior of 3D printed specimens. We also examined the impact of laminating conditions, including layer height, printing speed, and laminating direction, on the failure modes observed after the small punch tensile test.

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Assessment of Creep Behavior of Inconel 617 Alloy Weldment by Small Punch Test
Bum Joon Kim
J. Korean Soc. Precis. Eng. 2023;40(3):203-210.
Published online March 1, 2023
DOI: https://doi.org/10.7736/JKSPE.023.008
In this research, the small punch (SP) test was applied to examine the local creep characteristics of a narrow gap weldment. To find the local creep property, an Ni-based 617 alloy and its narrow gap weldment. which is one of candidates for advanced fossil power plants, were employed. Thin square specimens were machined at three different locations: weld metal, base metal, and HAZ near the base metal from the Inconel 617 alloy narrow gap weldment. The results of the SPC test were evaluated. The microstructure of narrow gap weldment was observed by scanning electron microscopy and optical microscopy to investigate the effect of the microstructure on the creep properties of the weld zone. The creep rupture part of the weldment was observed by scanning electron microscopy. Finally, four different creep characteristics of the narrow gap weldment were obtained by the SPC test with good validity.
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Effect of Fused Deposition Conditions on the Fracture Behavior of 3D Printed Tensile Specimens
Bum Joon Kim
J. Korean Soc. Precis. Eng. 2020;37(6):421-428.
Published online June 1, 2020
DOI: https://doi.org/10.7736/JKSPE.020.048
Three-dimensional printing technology has technical limitations limited to the development of prototypes focusing on functional realization. Because of these limitations, there are problems such as mechanical strength and rigidity in entering the commercialization market. However, the industry is working to overcome these obstacles in the future and apply them directly to the field for mass production in the manufacturing process. In particular, research to secure physical properties such as mechanical strength, the major problem of 3D printing products, has been initiated in the automobile industry, aviation, and medical fields. Thus, this study focused on the mechanical strength required for commercialization of 3D printing technology. To achieve this goal, a tensile specimen was fabricated by an FDM (Fused Deposition Modeling) type 3D printer. Tensile specimens were produced of round bar type and the deposition direction, layer height, and printing speed of the layers were considered. Finally, the effects of variables for each printing condition on tensile strength and fracture behavior were compared and analyzed. Also, the fracture surface of the tensile specimen was observed to investigate the effect of the deposition direction on the fracture behavior.

Citations

Citations to this article as recorded by  Crossref logo
  • Enhanced Analysis Model to account for Equivalent Anisotropic Properties of Parts according to 3D Printing Conditions
    Chae-Rim Seon, Da-Yeong Jang, Geung Hyeon Lee, Minho Yoon, Jang-woo Han
    Journal of the Computational Structural Engineering Institute of Korea.2025; 38(2): 131.     CrossRef
  • Tensile Behavior of 3D Printed Specimens by Small Punch Test
    Bum Joon Kim
    Journal of the Korean Society for Precision Engineering.2025; 42(10): 879.     CrossRef
  • Experimental Validation of Topology Design Optimization Considering Lamination Direction of Three-dimensional Printing
    Hee-Man Park, Gyu-Bin Lee, Jin-san Kim, Chae-Rim Seon, Minho Yoon
    Journal of the Computational Structural Engineering Institute of Korea.2022; 35(3): 191.     CrossRef
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Effects of Packing Parameter on Plastic Article Dimensions in the Plastic Injection Molding
Bum Joon Kim, Ju Kyung Shin, Jeong Goo Lee, Il Seon Sohn
J. Korean Soc. Precis. Eng. 2014;31(1):9-13.
Published online January 1, 2014
The molding process can be divided into five separate steps: plastification, injection, holding, cooling, and finally ejection. In the plastic injection molding, the effect factor such as mold temperature, injection speed, packing pressure and inhomogeneous cooling under packing process affects both the article dimension and physical characteristics. Especially, the packing pressure is the most critical factor to affect molded articles quality among the packing parameters. In this paper, the CAE simulation considering the molding condition is performed to predict the faulty cause which appears in the packing process between cavities of injection molding machine. From the results of CAE simulation, the packing phenomena according to the product form and the gate position was investigated to improve the article quality and minimize the various molding defects. The effect of packing pressure and gate number on the injection molding was discussed.
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Relationship Between Small-punch Creep Test Data and Uniaxial Creep Test Data based on the Monkman–Grant Relation
Bum Joon Kim, Ilseon Sohn, Byeong Soo Lim
J. Korean Soc. Precis. Eng. 2013;30(8):809-814.
Published online August 1, 2013
The relationship between the small-punch creep test and the conventional creep test was investigated experimentally using a method similar to that of the Monkman?Grant relationship. Uniaxial and small-punch creep rupture tests were carried out on 9Cr-2W ferritic steel(Commercial Grade 92 steel: X10CrWMoVNb 9-2) at elevated temperatures. From the relation derived in the same manner as the Monkman?Grant relation, a correlation between the displacement rate in response to the small-punch creep test and the strain rate in the uniaxial creep test was found, and the creep life was calculated using this relation. Furthermore, the failure modes of the small punch creep test specimens were investigated to show that the fracture was caused by creep.
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