MODELLING OF PERMANENT DEFORMATIONS - A SUPPORT FOR A BETTER UNDERSTANDING OF MATERIALS BEHAVIOUR?

This paper presents some ideas on the time-dependent deformation of bituminous materials which were developed by W Fluegge more than 20 years ago. The mechanics of continuous media is concerned with stresses, strains, and displacements. The behaviour of visco-elastic materials in uniaxial stress can be explained fairly accurately by models composed of discrete viscous and elastic elements. The basic elements are springs and dashpots. The differential equations of the models are derived. An equivalent formulation in terms of 'hereditary' integrals is presented, which is more flexible in explaining the measured properties of a specific material. It models a standard test consisting of a creep phase and a relaxation phase. Visco-elastic motion is usually so slow, that the product of acceleration and mass is usually very small compared with other forces present. This enables a substantial part of the theory to be developed without introducing inertia terms into the equations. However, mass inertia plays an important part in the theory of vibrations, which is outlined at the end of the paper. For the covering abstract see IRRD 896365.

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• Authors:
  • Eustacchio, E
• Conference:
  • PERFORMANCE RELATED TEST PROCEDURES FOR BITUMINOUS MIXTURES. PROCEEDINGS OF THE WORKSHOP HELD DUBLIN 6-7 NOVEMBER 1997
• Publication Date: 1997

Language

• English

Media Info

• Features: References;
• Pagination: p. 88-107

Subject/Index Terms

• TRT Terms: Bituminous mixtures; Deformation; Mathematical models; Mechanics; Motion; Stresses; Test procedures; Theory; Time; Vibration; Viscoelasticity
• ITRD Terms: 4967: Bituminous mixture; 5595: Deformation; 6473: Mathematical model; 5455: Mechanics; 5483: Movement; 5575: Stress (in material); 6288: Test method; 9078: Theory; 5414: Time; 5558: Vibration; 5935: Viscoelasticity
• Subject Areas: Materials;

Filing Info

• Accession Number: 00747340
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 1-85748-5955
• Files: ITRD
• Created Date: Apr 28 1998 12:00AM