신소재공학과

Seminar

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Date 20181106

MSE Regular Seminar



■ Title :  Design, Fabrication, and Mechanical Characterization of 3D Hollow Ceramic Nano-Architectures

           

■ Speaker :  Prof. Dongchan Jang (KAIST NQE)  

 

■ Date and Time :  11/6 (Tue) 16:00

 

■ Venue :  Applied Engineering Building (W1) 1st Floor, Multimedia Lecture Room

 

 Host :  Prof. Pyuck-Pa Choi

  

 Abstract :  Density-strength tradeoff appears to be an inherent limitation for most materials and therefore design of cell topology that mitigates strength decrease with density reduction has been a long-lasting engineering pursue for porous materials. Continuum-mechanics-based analyses on mechanical responses of the conventional porous materials with bending-dominated structures often give the density-strength scaling law following the power-law relationship with exponent of 1.5 or higher, which consequentially determines the upper bound of the specific strength for a material to reach. In this work, we present a new design criterion capable of significantly abating strength degradation in lightweight materials, by successfully combining size-induced strengthening effect in nanomaterials with architectural design of cellular porous materials. Hollow-tube-based 3D ceramic nano-architectures satisfying such criterion were fabricated in large area using Proximity field nano-Patterning (PnP) and atomic layer deposition (ALD). Experimental data from micro-pillar compression confirmed that the strengths of these nano-architectural materials scale with relative densities with power-law exponent of 0.93,hardly observable value in the conventional bending-dominated porous materials. Our discovery of new density-strength scaling law in the nano-architectured materials will contribute to creating new lightweight structural materials attaining unprecedented specific strengths overcoming the conventional limit.


List of Articles
No. Category Subject Author Date Views
Notice Regular 12/4 (Tue) Prof. Doo Seok Jeong (Hanyang Univ., Department of MSE) ADMINI 2018.11.30 128
Notice Regular 11/27 (Tue) Prof. Seong-Jun Jeong (Soongsil Univ.) ADMINI 2018.11.26 127
Notice Regular 11/20 (Tue) Prof. Youn Soo Kim (Department of MSE, POSTECH) ADMINI 2018.11.19 184
Notice Special 11/14 (Wed) Prof. Hui-Ming Cheng (Director and Professor, Tsinghua University, IMR CAS) ADMINI 2018.11.13 161
Notice Special 11/20 (Tue) Prof. Alfonso H. W. Ngan (Department of Mechanical Engineering, University of Hong Kong) file ADMINI 2018.11.13 175
Notice Regular 11/13 (Tue) Dr. Kang-Wook Lee (SK Hynix) ADMINI 2018.11.13 107
» Regular 11/6 (Tue) Prof. Dongchan Jang (KAIST NQE) ADMINI 2018.11.02 180
Notice Special 11/2 (Fri) Dr. Sungbong Park (Intel Corporation) ADMINI 2018.10.30 208
276 Regular 10/30 (Tue) Dr. Myung-Il Park (Korea Technology Finance Corporation) ADMINI 2018.10.26 136
275 Regular 10/23 (Tue) Dr. Sang-Soo Han (H&P International Patent & Law Office) ADMINI 2018.10.19 126
274 Regular 10/2 (Tue) Prof. Dohwan Kim (Hanyang Univ.) ADMINI 2018.10.01 283
273 Regular 9/18 (Tue) Prof. Seong Jun Kang (Kyung Hee Univ.) ADMINI 2018.09.17 371
272 Regular 9/11 (Tue) Dr. Byeongdu Lee (Argonne National Laboratory) ADMINI 2018.09.07 458
271 Regular 9/4 (Tue) Prof. Kibum Kang (Department of MSE, KAIST) ADMINI 2018.09.03 446
270 Regular 8/28 (Tue) Prof. Kyung-Min Kim (Department of MSE, KAIST) ADMINI 2018.08.24 525
269 Special 8/24 (Fri) Prof. Joel W. Ager III (UC Berkeley, Lawrence Berkeley National Laboratory) file ADMINI 2018.08.20 404
268 Special 8/23 (Thu) Prof. Jeehwan Kim (MIT, USA) file ADMINI 2018.08.20 346
267 Special 8/23 (Thu) Prof. YANGUANG LI (Soochow University) file ADMINI 2018.08.20 236
266 Special 7/25 (Wed) Dr. Chang Sub Kim (Department of MSE, MIT) ADMINI 2018.07.24 465
265 Special 7/13 (Fri) Prof. Dong Ryeol Whang (Johannes Kepler University Linz, Austria) file ADMINI 2018.07.09 440
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