Accession Number : AD0822677

Title :   SOME PROCEDURES FOR OBTAINING THE SHORT-TIME PORTION OF CREEP AND RELAXATION FUNCTIONS OF LINEAR VISCOELASTIC MATERIALS.

Descriptive Note : Interim technical rept.,

Corporate Author : CALIFORNIA UNIV BERKELEY STRUCTURAL ENGINEERING LAB

Personal Author(s) : Sackman, J. L. ; Kaya, I.

Report Date : SEP 1967

Pagination or Media Count : 25

Abstract : The analytical bases are given for the design of some experiments for the direct determination of the short-time portion of creep and relaxation functions of linear viscoelastic materials. These procedures, which emanate from a study of the manner in which waves propagate in viscoelastic media, should yield accurate results for very early times - the range in which it is usually difficult to assess the mechanical properties of viscoelastic materials. Some of the proposed methods utilize expansions valid for short times, while others are based primarily on convolutional operations. They require the measurement of the same response quantity at two different locations in the medium, or measurements of two different response quantities at the same location. (Author)

Descriptors :   (*VISCOELASTICITY, MATERIALS), (*CREEP, VISCOELASTICITY), (*RELAXATION TIME, VISCOELASTICITY), SOLIDS, TEST METHODS, CYLINDRICAL BODIES, VELOCITY, INTEGRAL EQUATIONS, STRESSES, DIGITAL COMPUTERS.

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE