The influence of partial surface shot peening on fatigue crack growth behaviour of a high‐strength ferritic steel

Abstract

The effects of partial surface shot peening on the fatigue crack growth behaviour of a ferritic steel have been experimentally investigated in this paper. Dog‐bone specimens fabricated from Optim700QL were tested under tension‐tension fatigue loads. Three distinct extents of partial shot peening, with respect to the crack tip and specimen symmetry line, were tested. The fatigue crack growth results from these experiments have been compared with those obtained from the same specimen geometry but with no peening. The results show that the residual stress fields formed ahead of the initial notch tip due to the partial peening process play a significant role in the fatigue crack growth behaviour of the material and effectively result in accelerated crack propagation at the midwidth of the specimens. It has been shown in this study that partial peening can lead to a fatigue crack growth rate around twice as fast as that of the unpeened specimen.

Cavitation shotless peening effects on fatigue crack growth behaviour under bending loads

“…In this work, the material utilised for examination was the high-strength ferritic steel referred to as 700 Optim QL [14]. In the completion of this work, 4-point bend specimens underwent machining from an 700 Optim QL plate.…”

“…In this work, the material utilised for examination was the high-strength ferritic steel referred to as Optim700QL. 14 In the completion of this work, four-point bend specimens underwent machining from an Optim700QL plate. As can be seen detailed in Figure 3, the dimensions of the four-point bend specimens were as follows: 330 mm length, 100 mm width, and 25 mm thickness.…”

Experimental and numerical studies of fatigue properties of carbon/glass fiber/epoxy hybrid composites enhanced with nano TiO2 powder

“…Mechanical behavior of composites under fatigue loading seems to be affected by fiber breakage, matrix cracking, interfiber fracture, and delamination between the layers. Different types of polymers such as epoxy, polyester, and vinylesters were used as a base for the composite materials [1] [2]. Many studies have confirmed that the incorporation of the small volume fraction of nanofibers as a filler in the polymer led to improve several fatigue properties.…”