Accession Number:

ADA028780

Title:

Effect of a Prestrain-Surface Layer Elimination Process on Low Cycle Fatigue Life.

Descriptive Note:

Final rept. 20 Feb 75-20 Mar 76,

Corporate Author:

GENERAL MOTORS CORP INDIANAPOLIS IND DETROIT DIESEL ALLISON DIV

Personal Author(s):

Report Date:

1976-03-22

Pagination or Media Count:

37.0

Abstract:

Low cycle fatigue specimens of Ti 6Al-4V and a martensitic stainless steel H46, were tested to determine the effect of a prestraining-surface layer elimination process on the low cycle fatigue life. Results of axial strain controlled tests conducted at ambient temperature, using a constant strain range after prestraining for specimens with and without a surface layer elimination process, showed no significant improvements over those of baseline tests for Ti 6Al-4V. However, H46 material did show an improvement as a result of a surface layer elimination process. The improvement was approximately 15 for both crack initiation and failure. The increase in life was attributed to an increase in the proportional limit which in turn decreased the amount of plastic strain. Author

Subject Categories:

  • Metallurgy and Metallography
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE