Effect of Cold Forming on the High Cycle Fatigue Behaviour of a 27MnCr5 Steel

Self‐heating measurements under cyclic loading to identify history effects on HCF properties of high‐strength low‐alloy steel: Part I—Experimental investigations

“…This load history has an effect on fatigue properties and taking into account these effects is crucial in the design of components. [1][2][3][4][5][6] However, studying these effects using classical fatigue tests would be very time-consuming considering the time dedicated to each cyclic test to failure and the amount of variables that have an influence on fatigue properties. The Palmgren-Miner linear accumulation damage rule 7 is usually used for the case of variable amplitude loading but the accuracy is quite low.…”

“…In addition, forming processes generate deformation inside the material. This load history has an effect on fatigue properties and taking into account these effects is crucial in the design of components 1–6 . However, studying these effects using classical fatigue tests would be very time‐consuming considering the time dedicated to each cyclic test to failure and the amount of variables that have an influence on fatigue properties.…”

Self‐heating measurements under cyclic loading to identify history effects on HCF properties of high‐strength low‐alloy steel: Part II—Modeling

“…However, load history, such as forming process or accidental loading, for example, can have an effect on the HCF properties. [1][2][3][4][5][6] Studying these load history effects on HCF properties considering regular fatigue tests would be very time consuming; therefore, it was proposed to investigate those effects by means of self-heating measurements under cyclic loading, given in the accompanying paper. 7 In order to predict S-N-P curves (i.e., amplitude stress, number of cycles to failure, and probability of failure) from self-heating measurements, a probabilistic two-scale model was developed, 8,9 assuming that fatigue initiation is caused by localized microplasticity that induces dissipated energy.…”

“…High cycle fatigue (HCF) properties of a steel grade are usually characterized from the as‐delivery state of the material. However, load history, such as forming process or accidental loading, for example, can have an effect on the HCF properties 1–6 . Studying these load history effects on HCF properties considering regular fatigue tests would be very time consuming; therefore, it was proposed to investigate those effects by means of self‐heating measurements under cyclic loading, given in the accompanying paper 7 …”

Simulation of Cold Forging Processes Using a Mixed Isotropic-Kinematik Hardening Model

“…In this regard, the numerical modelling is becoming state of the art in the cold forging companies and usual outputs are the material flow, used for checking the die filling and folds, and the punch forces. Advanced features that are not fully stablished in the sector are the advanced fracture criteria as proposed by Bariani et al and Stebunov et al [3,4] and the analysis of the resulting residual stresses and their influence on the final properties [5,6].…”