Accession Number : ADP010184

Title :   Methods for Diagnosing the Fatigue Damage Rate of Materials of Machine Elements and Estimating Their Fatigue Life

Corporate Author : JOINT OIL ANALYSIS PROGRAM PENSACOLA FLTECHNICAL SUPPORT CENTER

Personal Author(s) : Koltunov, Alexander

PDF Url : ADP010184

Report Date : APR 1996

Pagination or Media Count : 10

Abstract : A pre-failure process of expiring the resistance of metal materials to elastic, plastic and unstable deformations in machine parts are similar to those in short duration break tests of material specimens. Since the only similarity criterion for damage accumulation in a material element at different failure types is the ratio of characteristic times, the interconnected processes of expiring the resistance to elastic, plastic and unstable deformations in a material element and associated processes of accumulating damages can be estimated using the values of accumulated material damages in the short duration break, namely, in the form of ratios of the times for elastic, plastic and unstable deformations to the total time of specimen failure. The methods, developed on the basis of this regularity, for estimating materials' fatigue damage rate in short duration break tests enable not only quantifying the conditions of fatigue failures of machine parts but also determining their operational fatigue life and thereby obviating the need for time consuming, laborious and expensive tests of machine members.

Descriptors :   *METALS, *MECHANICAL PROPERTIES, *SYMPOSIA, *MACHINES, DAMAGE, FATIGUE LIFE, TEST METHODS, RUSSIA, FATIGUE(MECHANICS), AERONAUTICAL ENGINEERING.

Subject Categories : Properties of Metals and Alloys
      Machinery and Tools
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE