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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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Study on the Characteristic of Lateral Thrust System for Position and Posture Control in the Terminal Stage of Projectile
Kwang Joon Kim, Sang Youn Lee, Shin Hoe Kim, Sun Jae Rhee
J. Korean Soc. Precis. Eng. 2025;42(6):471-476.
Published online June 1, 2025
DOI: https://doi.org/10.7736/JKSPE.025.032
The propulsion system of a projectile is very important for the aerospace industry. To perform space exploration mission, controlling position and posture of the projectile in the terminal stage is very important. In this study, a new lateral thrust system is proposed to control the position and posture of the projectile at the terminal stage. Based on nozzles in a lateral thruster, a high-speed projectile can instantly change its position and posture. After changing its position and posture, reverse thrust is generated to control unnecessary movements for stabilizing. Based on various tests, the operation and performance of the nozzle opening device (NOD) of the separation mechanism were validated. As a result, excellent reproducibility was confirmed with standard deviation of 0.057 ms for the time from the end of igniter operation to the start of NOD separation. The internal pressure of the chamber and NOD separation time were inversely proportional to each other with a linear relation. The internal pressure of the chamber and flight speed of NOD were also proportional to each other. The flight speed of NOD was 37.53 m/s at the maximum expected operation pressure (β), 30.26 m/s at 0.5 β, and 17.05 m/s at 0 psi.
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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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Mathematical Modeling and Analysis for the Ejection Force of Pyrotechnic Suspension System
Jung Pil Kim, Gu Hyun Ryu, Joon Kim, Jae Seung Yoo
J. Korean Soc. Precis. Eng. 2021;38(7):513-520.
Published online July 1, 2021
DOI: https://doi.org/10.7736/JKSPE.021.036
The main function of aircraft ejection system is that it separates the store from the aircraft. The ejection force is important for the safety of the aircraft when the store is ejected, because the store can be lifted by air flow affected by the aircraft’s speed. If the ejection force is low, the aircraft can be damaged by the floating store. The ejection force of the suspension system should be designed in order to release the store safely. In this study, the ejection force of the pyrotechnic suspension using the cartridge to eject the store was researched. This research was performed, based on the precedent study about the over-center linkage mechanism and the pressure drop by the orifice. The ejection force was calculated, after analyzing mathematical fundamentals about the pressure in the system of the suspension and analyzed through AutoDyn and ADAMS software. Finally, the theoretical results were compared with the ejection test results of the suspension system.
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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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A Case Study on the Design Requirements of Airborne Black Box considering the Extreme Environment
Jung Pil Kim, Joon Kim, Jun Hyoung Kim, Tae Won Kim
J. Korean Soc. Precis. Eng. 2019;36(10):911-919.
Published online October 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.10.911
An airborne black box should preserve the recorded data under the extreme environmental conditions such an aircraft crash. Through the recorded information from the black box, the cause of the aircraft crash can be analyzed. This requires the black box to safely protect its memory board inside from the external forces or heat generated by the aircraft crash. This paper is a case study conducted to develop the black box to satisfy the crash survival requirements of ED-112A, the standard of performance to develop the black box, and optimize its weight and size. Through the sequential design, analysis, and test process, the black box successfully demonstrated the optimized design, analysis and test subjected to crash survival requirements of ED-112A. The prototype of the black box was fabricated and tested for the verification of each analysis within the requirements of ED-112A.

Citations

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  • Study on the Design Method of Small Black Box for Aircraft that Satisfies Extreme Environment Requirements
    Dong-Hun Son, Kwang-Min Kim, Jong-Hak Lee, Gu-Hyun Ryu
    Transactions of the Korean Society for Noise and Vibration Engineering.2024; 34(4): 385.     CrossRef
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Study on the Deburring of Intersecting Holes with Abrasive Flow Machining
Joon Kyu Beom, Young Gwan Kim, Kwang Joon Kim, Kwon Hee Kim
J. Korean Soc. Precis. Eng. 2019;36(2):163-168.
Published online February 1, 2019
DOI: https://doi.org/10.7736/KSPE.2019.36.2.163
Intersecting holes deep inside a workpiece, are difficult to deburr because of poor accessibility. When holes are small and the intersecting angle (acute angle between hole axes) is less than 45°, difficulty is at its extreme. In this study, abrasive flow machining is used for a hole diameter of 3mm and intersecting angles of 30° and 45°. Tests were performed for AL6061 specimens, with process parameters allocated to L8(27) orthogonal array. Degree of deburring is strongly dependent on intersecting angle, abrasive grit size, and total volume of flow. Successful deburring was achieved for 30° intersecting angle.
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Nd:YAG Fiber Laser Drilling Characteristics of Alumina Plates
Dae Hea, Kwon Hee Kim, Doo Hyun Cho, Kwang Joon Kim
J. Korean Soc. Precis. Eng. 2018;35(11):1055-1061.
Published online November 1, 2018
DOI: https://doi.org/10.7736/KSPE.2018.35.11.1055
The mechanical drilling of micro holes is considered a difficult endeavor, due to the high hardness and brittleness of alumina plates found during the drilling process. In this work, an alumina plate with a 4mm thickness is drilled with the use of a continuous-wave Nd:YAG fiber laser. As can be seen, there is minimum required power density to ablate the alumina plate. As shown in this study, the hole diameter and straightness are not constant with the hole depth recorded, which is presumably due to the recondensation of vaporized alumina, and the characteristics of irregular laser radiation. The oxygen pressure, power density, focal position, and laser on time (duration) are chosen as the control parameters. To understand the influence of control parameters, the orthogonal arrays table in Taguchi method is applied, and the micro holes are evaluated based on the use of geometrical factors. Through the review of a sensitivity and interaction analysis, the appropriate duration and oxygen pressure are identified as the major parameters governing the geometrical quality of drilled holes in this study.

Citations

Citations to this article as recorded by  Crossref logo
  • Micro Drilling of Single Crystal SiC Using Polycrystalline Diamond Tool
    Ui Seok Lee, Chan Young Yang, Ju Hyeon Lee, Bo Hyun Kim
    Journal of the Korean Society for Precision Engineering.2021; 38(7): 471.     CrossRef
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Driving Stability Analysis of Shelter Vehicles Passing by Each Other
Jeongroh Yoon, Donghun Son, Euibong Jeong, Joon Kim, Inkab Jang
J. Korean Soc. Precis. Eng. 2017;34(11):781-787.
Published online November 1, 2017
DOI: https://doi.org/10.7736/KSPE.2017.34.11.781
Tactical devices and equipment are usually loaded on a trailer vehicle within a shelter system. When the vehicle is moving fast and passing other vehicles, side panels of the shelter are deformed and tilted by pressure waves. Also, the vehicle is subjected to the effects of wind load and centrifugal force with the pressure waves at severe conditions. In this study, a theoretical analysis of overturn calculated by CFD (Computational Fluid Dynamics) and experiments is applied to the vehicle. Deformations of the side panel are measured for experimental validation of the CFD model. As a result, the safety factor of the driving stability of the vehicle is derived by theoretical analysis in the severe situation predicted by the validated CFD model.
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Application and Design of Eddy Current based on FEM for NDE Inspection of Surface Cracks with Micro Class in Vehicular Parts
Kwang-Hee Im, Seul-Ki Lee, Hak-Joon Kim, Sing-Jin Song, Yong-Deuk Woo, Sung-Woo Na, Woo-Chae Hwang, Hyung-Ho Lee
J. Korean Soc. Precis. Eng. 2015;32(6):529-536.
Published online June 1, 2015
A defect could be generated in bolts for a use of oil filters for the manufacturing process and then may affect to the safety and quality in bolts. Also, fine defects may be imbedded in oil filter system. So it is very important that such defects be investigated and screened during the multiple manufacturing processes. Therefore, in order effectively to evaluate the fine defects, the FEM simulations were performed to make characterization in the crack detection of the bolts and the parameters such as number of turns of the coil, the coil size, applied frequency were calculated based on the simulation results. Simulations were carried out for the defect signal of eddy current probe. Exciter and receiver were utilized. In this paper, the FEM simulations were performed in both bobbin-type and pancake-type probe, both probes were optimized under Eddy current FEM simulations and the results of calculation were discussed.
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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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Techniques of Editing and Reproducing Robot Operation Data for Direct Teaching
Han-Joon Kim, Young-Jin Wang, Jin-Oh Kim, Ju-Hoon Back
J. Korean Soc. Precis. Eng. 2013;30(1):96-104.
Published online January 1, 2013
Study of human-robot Interaction gets more and more attention to expand the robot application for tasks difficult by robot alone. Developed countries are preparing for a new market by introducing the concept of ‘o-Robot’model of human-robot Interaction. Our research of direct teaching is a way to instruct robot’ trajectory by human’ handling of its end device. This method is more intuitive than other existing methods. The benefit of this approach includes easy and fast teaching even by non-professional workers. And it can enhance utilization of robots in small and medium-sized enterprises for small quantity batch production. In this study, we developed the algorithms for creating accurate trajectory from repeated inaccurate direct teaching and GUI for the direct teaching. We also propose the basic framework for direct teaching.
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Single-cell Electroporation and Gene Transfection using MEMS-based Microdevice with Cantilever-type Microelectrode
Young Hak Cho, Beomjoon Kim
J. Korean Soc. Precis. Eng. 2010;27(5):85-91.
Published online May 1, 2010
In this paper, we present details on fabrication of single-cell electroporation microdevice, practical experiments of single-cell electroporation with our fabricated microdevice. Also, the continuous electroporation for the continuous flow of cells is used for high-throughput electroporation. The delivery efficiency and cell viability tests are provided and the successful GFP transfection into cells is also evaluated with a fluorescent microscope after electroporation. This device enables to reduce the size of samples and thus the use of small amount of reagents. Also, it makes it possible to permit to avoid cell discrimination (transfected cells versus non-transfected cells) encountered when traditional bulk electroporation is held.
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Web-based Product Development Engineering Collaboration System: System Framework
Ji Hyung Park, Sung Joon Kim, Yong Hyun Jang, Kyung Hwa Park, Gyu Bong Lee
J. Korean Soc. Precis. Eng. 2006;23(5):7-14.
Published online May 1, 2006
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