期刊
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
卷 130, 期 -, 页码 165-180出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2019.06.009
关键词
Open-cell metal foams; Ni/PU hybrid foams; Digital image correlation; Thermography; Full-field thermomechanical analysis
Open-cell metal/polymer hybrid foams are biomimetic open-porous composites, consisting of a polymeric foam electrochemically coated with a metallic layer. Due to their specific pore structure, they can be used in lightweight applications or as crash absorbers. The nanocrystalline coating leads to a strengthening effect and largely improved energy absorption capacity. Understanding the mesoscopic deformation behaviour of foams is essential for the design of intelligent and safe crash absorbers for the future. The present contribution focuses on the full-field thermomechanical analysis of the mesoscopic deformation of metal/polyurethane hybrid foams and hollow strut foams. Local strain fields from digital image correlation were directly coupled with local temperature fields from infrared thermography. A new software tool allows for the direct correlation of thermal and mechanical fields and for the corresponding experimental stress-strain data. Furthermore, the evolution of the energy absorption capacity as function of the strain rate was determined using infrared thermography. (C) 2019 Elsevier Ltd. All rights reserved.
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