FATIGUE OF ASPHALT; CRACK INITIATION - ENERGY DISSIPATION. WORKING DAYS ON ROAD ENGINEERING 1990, PROCEEDINGS OF A CONFERENCE HELD IN EDE, THE NETHERLANDS, MAY 9-10, 1990. PART 1

VERMOEIING VAN ASFALT; SCHEURINITIATIE - ENERGIEDISSIPATIE

The fatigue process of materials can be divided into two subsequent stages. In the first the initial fatigue strength of the material is affected. At the end of this stage (local) micro cracks have initiated (crack initiation stage). Then these micro cracks start growing (crack growing stage). By dynamic fourpoint bending tests with a "complex" prescribed strain signal, it is shown that the fatigue life is not determined by the height of the strain signal alone. However, the observed fatigue life (until crack initiation) can be explained if the mean dissipated energy per cycle is taken as the relevant parameter in the fatigue process. The consequence of this observation may be that fatigue of the material (crack initiation) will also occur if only "push" stresses are applied. However, for the growth process of the micro cracks "pull" stresses remain necessary. The paper ends with a number of statements which in the opinion of the authors can be deduced from the observations. For the covering abstract of the conference see IRRD 836802. (Author/TRRL)

• Corporate Authors:

  CROW

  GALVANISTRAAT 1
  EDE,   Netherlands  NL 6716 AE

  Ministry of Communications, Republic of China

  Highway Research Institute, 12 Bei Huan Xi Lu
  Beijing,   China  100088
• Authors:
  • Pronk, A C
  • HOPMAN, P C
• Publication Date: 1990

Language

• Dutch

Media Info

• Features: References;
• Pagination: p. 83-94
• Serial:
  • Publication of: CROW
  • Publisher: CROW

Subject/Index Terms

• TRT Terms: Asphalt pavements; Bend tests; Conferences; Cracking; Dissipation; Durability; Fatigue (Mechanics); Fatigue strength; Fracture mechanics; Microcracking; Stresses
• Uncontrolled Terms: Crack growth; Microcracks
• Geographic Terms: Netherlands
• Subject Areas: Energy; Highways; Pavements;

Filing Info

• Accession Number: 00617148
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: No. 37-I
• Files: ITRD, TRIS
• Created Date: Nov 30 1991 12:00AM