Compressions tests on right, cylindrical steel specimens were performed in order to determine the stress-strain behavior. Lubrication was achieved by using a thin PTFE (Hostaflon) sheet on either side of the specimen. Preliminary testing with geometrically similar specimens (aspect ratio of 1.5) showed that the stress-strain relations were affected by the size of the specimen. This paper deals with the theoretical investigation and the experimental verification of this phenomenon (termed the “size effect”). It is concluded that homogeneous deformations up to large strains can be maintained by proper selection of the PTFE sheet thickness.

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