High-strain-rate compressive behavior of a rigid polyurethane foam with various densities

Autor:	Fangyun Lu, Weinong Chen, Nancy A. Winfree
Rok vydání:	2002
Předmět:	Stress (mechanics) Compressive strength Materials science Mechanics of Materials Mechanical Engineering Linear elasticity Solid mechanics Aerospace Engineering Split-Hopkinson pressure bar Strain rate Elasticity (economics) Composite material Quasistatic process
Zdroj:	Experimental Mechanics. 42:65-73
ISSN:	1741-2765 0014-4851
DOI:	10.1007/bf02411053
Popis:	The dynamic compressive stress-strain behavior of a rigid polyurethane foam with four values of density (78, 154, 299, and 445 kg/m3) has been determined in the strain-rate range of 1000–5000 s−1. A pulse shaping technique was used with a split Hopkinson pressure bar to ensure homogeneous deformation in the foam specimens under dynamic compression. Dynamic stress equilibrium in the specimen was monitored during each experiment using piezoelectric force transducers mounted close to the specimen end-faces. Quasi-static experiments were also performed to demonstrate rate effects. Experimental results show that both the quasistatic and the dynamic stress-strain curves of the foam exhibit linear elasticity at small strains until a peak is reached. After the peak, the stress-strain curves have a plateau region followed by a densification region. The peak stress is strain-rate sensitive and depends on the square of the foam density.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::35200691a565d501f5903117d6e86e70 https://doi.org/10.1007/bf02411053 Zobrazit plný text záznamu Full text from SpringerLink