STRESS CONCENTRATION WITH FATIGUE LOADING.

Abstract

The influence of stress concentration on the fatigue behavior of mild cold drawn steel St 42 K was investigated. Axial fatigue tests were performed at room temperature with a frequency of about 10 and 2000 cpm with cylindrical smooth and circumferentially notched specimens (notch root radius = 1.0 mm and 3.5 mm) in the endurance range N = 1/4 to 10 to the 7th power load cycles. The mean stress was varied between compression and the nominal tensile strength. The HOOKIAN stress concentration factor was calculated to 1.7 and 2.7. The experimentally determined fatigue strength reduction factor (ratio plain fatigue strength to notched fatigue strength at sigma sub m = 0 and N = 10 to the 7th power) was 1.5 and 2.5. By application of NEUBER's notch stress theory an approximative precalculation method for the fatigue strength reduction factor is established. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 31, 1967
Accession Number
AD0668774

Entities

People

  • Heinz Neuber
  • Ludwig Bertele

Tags

DTIC Thesaurus Topics

  • Compression
  • Fatigue Tests (Mechanics)
  • Frequency
  • Mechanical Properties
  • Physical Properties
  • Stress Concentration
  • Stresses
  • Tensile Strength

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Structural Health Monitoring of Composite Structures.