Scaling Equation for yield strength of nanoporous open-cell foams

Journal Article · Thu May 25 00:00:00 EDT 2006 · Acta Materialia

OSTI ID:902340

Hodge, A M; Biener, J; Hayes, J R; Bythrow, P M; A Volkert, C; Hamza, A V

A comprehensive study on the relationship between yield strength, relative density and ligament sizes is presented for nanoporous Au foams. Depth-sensing nanoindentation tests were performed on nanoporous foams ranging from 20 to 42% relative density with ligament sizes ranging from 10 to 900 nm. The Gibson and Ashby yield strength equation for open-cell macro-cellular foams is modified in order to incorporate ligament size effects. This study demonstrates that at the nanoscale, foam strength is governed by ligament size, in addition to relative density. Furthermore, we present the ligament length scale as a new parameter to tailor foam properties and achieve high strength at low densities.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 902340
• Report Number(s): UCRL-JRNL-221840; ACMAFD; TRN: US200717%%192
• Journal Information: Acta Materialia, Vol. 55; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
FOAMS
YIELD STRENGTH
POROUS MATERIALS
DENSITY
GOLD