Size effects due to Cosserat elasticity and surface damage in closed-cell polymethacrylimide foam

Autor:	W. B. Anderson, Roderic S. Lakes
Rok vydání:	1994
Předmět:	Machining process Materials science Mechanical Engineering Torsion (mechanics) Stiffness Machining Mechanics of Materials Solid mechanics Closed cell medicine General Materials Science medicine.symptom Composite material Damage effects Softening
Zdroj:	Journal of Materials Science. 29:6413-6419
ISSN:	1573-4803 0022-2461
DOI:	10.1007/bf00353997
Popis:	This article describes the experimental investigation of Cosserat (or micropolar) elasticity and surface damage effects in closed-cell polymethacrylimide foams of different densities. The method of size effects was used to find the degree of Cosserat behaviour for both cylindrical and square cross-section specimens in bending and torsion. The foams were found to behave as Cosserat materials in which slender specimens appear less stiff than thick ones, provided sufficient care is taken when machining the specimens. Surface damage caused by the machining process may cause the apparent stiffness to decrease with decreasing specimen size, giving an opposite softening size effect.
Databáze:	OpenAIRE
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