Residual stress relaxation and low- and high-cycle fatigue behavior of shot-peened medium-carbon steel

Numerical modelling of the fatigue crack shape evolution in a shot-peened steam turbine material

“…This process typically induces increased surface roughness, strain hardening and compressive residual stresses (CRS) within the surface layer [4]. Many investigations have focused on the effect of shot peening on fatigue behaviour in different material systems such as steel [1,3,[5][6][7], aluminium [8][9][10][11][12][13], titanium [8], magnesium [8,14,15] alloys and nickel-based superalloys [16,17]. It can be generally concluded that the roughened surface after the peening treatment may accelerate crack initiation [8], on the other hand, the CRS and strain hardening effects can compensate for this by deferring the short crack onset and propagation process [5,9,10,14,18].…”

“…Many researchers have systematically studied the residual stress relaxation behaviour in shot-peened specimens during fatigue loading both experimentally and numerically [2,6,7,11,15,16,[21][22][23]. It was found that the residual stress distribution generally reached a stabilised state after a logarithmic relaxation process during fatigue loading.…”

“…It was found that the residual stress distribution generally reached a stabilised state after a logarithmic relaxation process during fatigue loading. Most studies have related the improvement in fatigue life by shot peening to the extent of the remaining CRS field after residual stress relaxation, and tried to predict the fatigue life utilising some stress-or strain-based approaches without explicitly considering the crack initiation and propagation behaviour [6,7,24,25]. These approaches have been demonstrated to be effective and efficient, particularly in the high-cycle fatigue (HCF) regime.…”

The Role of Overloading on the Reduction of Residual Stress by Cyclic Loading in Cold-Drawn Prestressing Steel Wires

“…Others are based on design modifications of the process, mainly focused on the die geometry [4][5][6][7][8][9][10][11]. However, for certain cases (mainly when the surface residual stresses are compressive in nature), an improvement of the mechanical behavior against fatigue is achieved [12]. Thus, the use of surface post-treatments such as shot peening (whose aim is to introduce compressive stresses in the component surface and its vicinity) is currently widespread in industry.…”

Кинетика напряжeнно-деформированного состояния в поверхностно упрочнeнном цилиндрическом образце при сложном напряжeнном состоянии в условиях ползучести

“…Несмотря на бо-лее чем полувековую историю данного вопроса, в последнее время эмпириче-ские подходы продолжают интенсивно развиваться. В частности, например, в работах [7][8][9][10][11] исследовалась релаксация наведённых остаточных напря-жений в цилиндрических образцах либо в условиях термоэкспозиции (чисто температурной выдержки без механических нагрузок), либо в условиях одно-осного нагружения при высоких температурах, а работы [13][14][15] посвящены влиянию циклических нагрузок на релаксацию остаточных напряжений.…”