Role of residual stresses induced by double peening on fatigue durability of automotive leaf springs

Warm laser shock peening without coating induced phase transformations and pinning effect on fatigue life of low-alloy steel

“…Shot peening based surface modification technology considerably improved the fatigue life of metallic materials over the last few decades. In general, it is well known that the process exhibits desirable property enhancement of engineering materials/components through induction of compressive residual stresses (RS) [1][2][3][4][5][6]. Since this technology introduces poor surface finish and less magnitude of penetration of compressive RS.…”

Fatigue life prediction: A comparative study for a three layer EN45A parabolic leaf spring

“…They presented a more precise method based on non-linear finite element solutions by evaluating the effects of the production parameters, the geometrical tolerances and the variations in the characteristics of the material. Scuracchio et al (2013) described the role of shot peening in manufacturing leaf springs for vehicles, through the analysis of residual stresses by X-ray diffraction and fatigue tests on a series of samples that were subject to ten different peening schedules. Cerny and Mayer (2012) summarized the most important results of selected experimental programs on static and fatigue strength of heavy loaded components and joints made of glass reinforced plastic (GRP) composites, having been recently performed in fatigue laboratory of the SVUM research and testing institute.…”

Residual Stress Gradients in AISI 9254 Steel Springs Submitted to Shot Peening and Heat Treatment for Increased Fatigue Resistance

“…Although the role of shot peening in enhancing fatigue resistance by the generation of compressive residual stresses is well understood, detailed investigations on the relation of process parameters and component performance are less common [13]. For instance, it is still matter of debate whether the major benefits to fatigue performance are due to the compressive residual stress field itself or rather to changes in the microstructure of shot peened components [14].…”

“…Double shot peening is interesting because of the possibility of increasing fatigue properties [13]. The springs were made of AISI 9254 steel, a high strength steel commonly used in the automotive industry [7].…”

“…As a consequence, the material undergoes strain-hardening, which increases yield strength at the surface, and the imposition of compressive residual stresses [4] which hinder crack nucleation and growth increasing fatigue resistance, as attested by numerous researchers [5][6][7][8][9][10][11]. Furthermore, shot peening is a highly flexible process that can be applied to components with various geometries and also increases resistance to stress corrosion cracking, fretting and erosion [12].Although the role of shot peening in enhancing fatigue resistance by the generation of compressive residual stresses is well understood, detailed investigations on the relation of process parameters and component performance are less common [13]. For instance, it is still matter of debate whether the major benefits to fatigue performance are due to the compressive residual stress field itself or rather to changes in the microstructure of shot peened components [14].…”