Ductile Instability of Time-Dependent Crack Growth Under Constant Loading

Masumi Saka, Mikio Muraoka, Hiroyuki Abe

Research output: Contribution to journalArticlepeer-review


Experimental results are presented for time-dependent crack growth obtained from load-hold testing at room temperature. The test are carried out over a wide range of loading rates before load holding, which includes a high rate as well as a low rate. First, it is shown that when the load is applied with a high rate, the threshold value of load holding for ductile instability is not limited to values near the maximum load as reported so far, but decreases. Next, the condition is clarified for the transition of time-dependent crack growth from stable to unstable. Then the incipient point of the transition is studied, where the incipient point is denned as a point from which the rate of the crack-mouth opening displacement increases. It is found that the incipient point occurs when the macroscopic deformation of the specimen under a constant loading attains that at the maximum load under monotonic loading.

Original languageEnglish
Pages (from-to)14-23
Number of pages10
JournalTransactions of the Japan Society of Mechanical Engineers Series A
Issue number497
Publication statusPublished - 1988


  • Ductile Instability
  • Fracture
  • Incipient Point of Instability
  • Load-hold Testing
  • Threshold Value of Holding Load
  • Time-dependent Crack Growth

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering


Dive into the research topics of 'Ductile Instability of Time-Dependent Crack Growth Under Constant Loading'. Together they form a unique fingerprint.

Cite this