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

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-s...

Full description

Saved in:
Bibliographic Details
Published inJournal of materials science Vol. 29; no. 24; pp. 6413 - 6419
Main Authors ANDERSON, W. B, LAKES, R. S
Format Journal Article
LanguageEnglish
Published Heidelberg Springer 15.12.1994
Subjects
Applied sciences
Cellular
Exact sciences and technology
Forms of application and semi-finished materials
Polymer industry, paints, wood
Technology of polymers
Degradation
Polyimide
Closed cell
Size effect
Foam(plastics)
Elasticity
Mechanical properties
Experimental study
Cosserat material
Surface
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00353997