SEDL / STP / STP1367-EB / STP14729S

Interaction of High-Cycle and Low-Cycle Fatigue on Fretting Behavior of Ti-6-4

Cortez, R
Materials Research Engineer, Air Force Research Laboratory, Sensors Directorate, Wright-Patterson AFB, OH

Mall, S
Principal Materials Research Engineer, Air Force Research Laboratory, Materials & Manufacturing Directorate, Wright-Patterson AFB, OH

Calcaterra, JR
Aerospace Engineer, Air Force Research Laboratory, Air Vehicles Directorate, Wright-Patterson AFB, OH

Pages: 16    Published: Jan 2000

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Abstract

The fretting behavior of Ti-6Al-4V when subjected to combined high-cycle fatigue/low-cycle fatigue (HCF/LCF) was investigated. Constant amplitude fretting fatigue tests were first conducted at room temperature at both 1 Hz and 200 Hz frequencies. The fretting fatigue life was smaller for the higher frequency condition than for the lower one. Then, fretting tests combining the interaction of both high-frequency and low-frequency waveforms were conducted which yielded similar lives to the constant amplitude fretting fatigue tests. Tests consisting of HCF/LCF blocks of 50:1, 500:1, and 5000:1 were examined where the ratio represented the number of HCF cycles to LCF cycles. Overall, Miner's linear damage summation rule provided a reasonable estimate of combined HCF/LCF fretting lives for the HCF/LCF tests considered.