Determination of stress–strain characteristics of thin polymer films on cylindrical specimens

Proceedings of the Estonian Academy of Sciences

Martins Kalnins¹  Dace Cerpakovska¹  Natalja Jelinska¹  Sergey Gluhih¹  Ernests Auzins¹ 

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关键词: polymers;    thin films;    cylindrical shell;    compression;    test methods;    stress-deformation characteristics;   

DOI  :  10.3176/proc.2012.3.04

学科分类：化学（综合）

来源: Teaduste Akadeemia Kirjastus

【 摘 要 】

An experimental method (TWCS method) was applied to determine the flexural elastic modulus E and some other stress-deformation characteristics of a thin-walled circular cylindrical polymer shell at compression. A methodology of test sample preparation and fixation as well as means of the measurement of the load P and the respective displacement Δ were developed. Two modes of testing the equipment were used in which the sequences of measuring P -> Δ and Δ -> P were implemented. Repeatability of measurements was evaluated. Optimal geometric parameters of test samples and the range of determinable values of modulus E were defined. A procedure of the calculation of the relationship between the tensile stress σ and relative elastic tensile deformation ε in the most deformed area of the sample was developed. Applicability of the TWCS method for multiple assessments of changes of deformational characteristics by using a single sample was proved. It was shown that creep, creep recovery, and stress relaxation tests can be performed by the TWCS method.

【 授权许可】

Unknown