[KSCI] Korea Science Citation Index Service

Efficient Layered Manufacturing Method of Metallic Sandwich Panel with Pyramidal Truss Structures using Infrared Brazing and its Mechanical Characteristics

Lee, Se-Hee (Department of Mechanical Engineering, KAIST)
Seong, Dae-Yong (Department of Mechanical Engineering, KAIST)
Yang, Dong-Yol (Department of Mechanical Engineering, KAIST)

Publication Information

Journal of the Korean Society for Precision Engineering / v.27, no.8, 2010 , pp. 76-83 More about this Journal

Abstract

Metallic sandwich panels with pyramidal truss structures are high-stiffness and high-strength materials with low weight. In particular, bulk structures have enough space for additional multi-functionalities. In this work, in order to fabricate 3-D structures efficiently, Layered Manufacturing Method (LMM) which was composed of three steps, including crimping process, stacking process and bonding process using rapid infrared brazing, was proposed. The joining time was drastically reduced by employing infrared brazing of which heating rate and cooling rate were faster than those of conventional furnace brazing. By controlling the initial cooling rate slowly, the bonding strength was improved up to the level of strength by conventional vacuum brazing. The observation of infrared brazed specimens by optical microscope and SEM showed no defect on the joining sections. The experiments of 1-layered pyramidal structures and 2-layered pyramidal structures subject to 3-point bending were conducted to determine structural advantages of multilayered structures. From the results, the multi-layered structure has superior mechanical properties to the single-layered structure.

Keywords

Pyramidal Truss Structure; Infrared Brazing; Shear Bonding Tests; Three-point-bend Test;

Citations & Related Records

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