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An alternative definition of material properties
Author(s) -
MEDLAND A. J.
Publication year - 1976
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/j.1475-1305.1976.tb00170.x
Subject(s) - poisson's ratio , bar (unit) , instrumentation (computer programming) , material properties , shear modulus , shear (geology) , simple (philosophy) , modulus , structural engineering , poisson distribution , materials science , computer science , mathematics , engineering , physics , composite material , statistics , meteorology , operating system , philosophy , epistemology
The stresslstrain relation is initially discussed in general form. The normal matrix formulation employing the Lamé Constants and the more ‘practical’ formulation based on the Elastic Modulus and Poisson's Ratio are detailed. An alternative approach employing the wave speeds of the material as the basic material parameters is discussed. This approach has a number of advantages over the present tensile testing methods. The main advantages are that the properties can be obtained on the actual part or specimen without resorting to destructive testing means, and the data can be collected with the same strain gauge equipment that is to be employed in subsequent testing procedures. The problem associated with the measurement of short duration, low amplitude pulses is discussed and the broad details of the required instrumentation are given. Two simple experiments are illustrated in which firstly, the wave velocity in a bar is obtained and secondly, the dilatational and shear wave speeds are obtained in a plate structure.