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Auyeskhan Ulanbek,STEED CLINT ALEX,박수형,김동현,정임두,김남훈 한국CDE학회 2023 Journal of computational design and engineering Vol.10 No.3
There is a combinatorial explosion of alternative variants of an assembly design owing to the design freedom provided by additive manufacturing (AM). In this regard, a novel virtual reality-based decision-support framework is presented herein for extracting the superior assembly design to be fabricated by AM route. It specifically addresses the intersection between human assembly and AM hence combining design for assembly, and design for additive manufacturing using axiomatic design theory. Several virtual reality experiments were carried out to achieve this with human subjects assembling parts. At first, a two-dimensional table is assembled, and the data are used to confirm the independence of non-functional requirements such as assembly time and assembly displacement error according to independence axiom. Then this approach is demonstrated on an industrial lifeboat hook with three assembly design variations. The data from these experiments are utilized to evaluate the possible combinations of the assembly in terms of probability density based on the information axiom. The technique effectively identifies the assembly design most likely to fulfill the non-functional requirements. To the authors’ best knowledge, this is the first study that numerically extracts the human aspect of design at an early design stage in the decision process and considers the selection of the superior assembly design in a detailed design stage. Finally, this process is automated using a graphical user interface, which embraces the practicality of the currently integrated framework and enables manufacturers to choose the best assembly design.
Design Approach for Additive Manufacturing of a Dynamically Functioning System: Lifeboat Hook
Ulanbek Auyeskhan,Namhun Kim,Chung-Soo Kim,Tran Van Loi,Jihwan Choi,Dong-Hyun Kim 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.5
The design freedom provided by Additive Manufacturing (AM) enables the part consolidation (PC) of sophisticated mechanical assemblies. However, PC has been mainly performed for static components in assemblies with nonmoving parts. In this regard, a new approach to assembly-level Design for Additive Manufacturing (A-DfAM) considering an industrial lifeboat hook assembly with a functionally dynamic system is proposed. The methodology comprises steps starting from inputting the Computer-Aided Design (CAD) fi les for the 3D printing of the final assembly and evaluation. Throughout the design stages, opportunistic and restrictive natures of DfAM within our methodology direct engineers and designers to manufacture optimized products. In addition, a comparative assessment of the original and fi nal assemblies is also illustrated. Consequently, a significant part-count reduction after PC was achieved, and the prototype of the lifeboat hook components was printed via laser-powder bed fusion (L-PBF). This shows that by incorporating the suggested A-DfAM framework, it can serve as a potential guide to whoever intends to manufacture dynamic assemblies.
Waseem, Owais Ahmed,Auyeskhan, Ulanbek,Lee, Hyuck Mo,Ryu, Ho Jin Published for the Materials Research Society by th 2018 Journal of materials research Vol.33 No.19
<▼1><B>Abstract</B><P/></▼1><▼2><P>To overcome the limited feasibility of various refractory high-entropy alloys (HEAs) due to the presence of (i) very dense elements (W and Ta), (ii) costly elements (Hf and Ta), and (iii) oxidation prone elements (V) in them, Al<I>x</I>Cr<I>y</I>Mo<I>z</I>NbTiZr HEAs were prepared via arc-melting. Considering the critical nature of oxidation resistance in high-temperature applications, HEAs were characterized to form a combinatorial library of microstructural and oxidation behavior. Al<I>x</I>Cr<I>y</I>Mo<I>z</I>NbTiZr HEAs revealed multiphase microstructures consisting of intermetallic phases along with BCC matrices. Mass loss and porous microstructures were obtained in Mo-rich HEAs after oxidation at 1000 °C for 1 h. The presence of Al enhanced the oxidation resistance and developed a protective oxide layer on the HEAs. Al30Cr10-NTZ exhibited promising potential for use in high temperature applications, as it showed an oxidation time exponent of ∼0.5 and a dense and continuous oxide layer.</P></▼2>
Van Loi Tran,Byeong-Cheon Kim,Thanh Thuong Do,Shengwei Zhang,Kyoungsik Chang,Sung-Tae Hong,Ulanbek Auyeskhan,Jihwan Choi,Dong-Hyun Kim 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.23 No.12
The design principle of an additively manufactured (AMed) lattice structural conformal cooling channel for hot stamping is investigated. AM with selective laser melting is adopted to fabricate a lab-scale rapid cooling die filled with conformal lattice structures, which provide structural stiffness, act as thermal fins, and expedite the occurrence of turbulent flow in the channel. Three different surface area densities with the same relative volume density were considered to evaluate the heat transfer and cooling performance. Computational fluid dynamics is used to analyze the flow of coolant in the lattice structures with different surface area densities. The experimental and computational results show that if the surface density of the lattice structure is selected properly, the cooling performance can be enhanced significantly while maintaining a constant relative volume density, which directly affects the weight reduction and stiffness of the cooling die.