Abstract
One of the important aspects of mechanical design is improving fatigue life.; In this work, the effect of Ultrasonic impact treatment (UIP) and shot peening (SP)on constant cumulative fatigue life and fatigue strength of AA7075-T6 were studied; The sample group was machined and primed, and some specimens were treated using ultrasonic impact therapy (UIT) with one line of peening. Fatigue experiments were conducted under constant and variable amplitude (R=-1) at ambient temperature to determine the fatigue life of the S-N curve and fatigue strength during treatment 3.46% and 8.57% at 107 cycles for (UIT) and (SP). Cumulative fatigue damage testing was carried out for two steps loading it is observed that the fatigue life for SP and UIP treated specimens was improved compared to the unpeeled results. The fatigue endurance limit was enhanced by 35% for UIT and 54% for SP. The fatigue life for both treatments was much improved compared to as-received metal. These results also show a strong tendency of increasing fatigue strength after application of (UIT) and (SP) with an increase in mechanical properties of the material used.
Highlights
Fatigue is described as a crack or damage of structure or component subjected to dynamic load
The present study focuses on the effect of (UIT) and (SP) techniques on cumulative fatigue damage and on improving the mechanical properties and fatigue behavior of the surface treatment compound AA 7075-T6 instead of only one conventional surface treatment, resulting in a duplicate improvement of the surface treatment
The result of this series has brought some 3.3 Cumulative fatigue test results comments in the operation of fatigue behavior of AA7075-T6 under constant loading shown in figure (6) the fatigue endurance limits of shotpeened specimens were increased by 8.57% and 3.46% for shot peening (SP) and Ultrasonic impact treatment (UIP) respectively
Summary
Fatigue is described as a crack or damage of structure or component subjected to dynamic load. The fatigue hardness of alloy improves during surface treatments by introducing compressive residual stress (CRS) on the surface which guidance to produce an obstacle to crack production. Ferreira et al [6] Effect on fatigue life of the (UIP) and (SP) AA7475 models The aim of their examination is to modify the surface by means of a variety of three peening measures: miniature shot peening (MSP) with spots of two unmistakable sizes (MSP) and (UP). The impact of cumulative corrosion fatigue tests has shown that lifespan of the eroded specimens as a result of the UIT has enhanced to around (3 per cent-2.25 per cent) for low-and high-low sequences. Where D is the cumulative fatigue damage and ni, Nfi is the applied cycles and the number of cycles to failure under i-th constant S-N curve stress level respectively.
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