Creep and recovery in graphites at ambient temperature: an acoustic emission study

Neighbour, Gareth B and McEnaney, Brian (1993). Creep and recovery in graphites at ambient temperature: an acoustic emission study. Carbon, 32(4) pp. 553–558.

DOI: https://doi.org/10.1016/0008-6223(94)90071-X

Abstract

Nuclear graphites subject to compressive or tensile stress cycling show a Felicity effect, that is, acoustic emission (AE) is detected at stresses less than the previous peak stress. This is attributed to recovery processes that occur upon unloading and at zero stress. The extent of recovery increases with time (up to 105 mins) at zero stress between cycles. For two graphites (IM1-24 and PGA) held under constant compressive or tensile strain, AE over ∼16 h is attributed to creep. For the same graphites at zero stress (after application of a compressive or tensile prestress), AE over ∼16 h is attributed to creep recovery. Both types of AE time curve follow logarithmic rate laws similar to those derived earlier for high-temperature primary creep and creep recovery. The micromechanical processes that give rise to creep and AE on loading graphites are basal plane shear and microcracking; creep recovery is attributed to the reverse of these processes.

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About

  • Item ORO ID
  • 60563
  • Item Type
  • Journal Item
  • ISSN
  • 0008-6223
  • Keywords
  • graphite, creep, acoustic emission
  • Academic Unit or School
  • Other Departments > Other Departments
  • Depositing User
  • Gareth Neighbour

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