Accession Number:

ADA056860

Title:

Crack Tip Plasticity Associated with Corrosion Assisted Fatigue.

Descriptive Note:

Interim rept. Jun 77-Jun 78,

Corporate Author:

SOUTHWEST RESEARCH INST SAN ANTONIO TEX

Personal Author(s):

• Davidson,D. L.
• Lankford,J.

Report Date:

1978-05-31

Pagination or Media Count:

38.0

Abstract:

The experimentally measured subgrain size distribution caused by the propagation of a fatigue crack through Fe - .05C steel has been used to calculate 1 stress range distribution around the crack tip 2 strain range distribution near the crack 3 the effect of a water vapor environment on the stress range and strain range distributions 4 the effect of a water vapor environment on the energy required to form a unit area of new crack surface and 5 the effect of cyclic stress intensity factor delta K on the above variables. Throughout the development of the above results, an effort has been made to correlate the results of other investigators with the present experimental findings, and to present unifying concepts. The mechanism of fatigue crack propagation in an inert environment is given, and the effect of water vapor on that mechanism is described. Author

Descriptors:

• *CORROSION
• *CRACK PROPAGATION
• *FATIGUE(MECHANICS)
• *CARBON STEELS
• STRESSES
• ENVIRONMENTS
• DISTRIBUTION
• INTERACTIONS
• CRACKS
• GRAIN SIZE
• STRAIN(MECHANICS)
• PLASTIC PROPERTIES

Subject Categories:

• Properties of Metals and Alloys
• Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE