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Optimization of Spring Performance Through Understanding and Application of Residual Stress

From Lambda Technologies

The intent of this paper is not to present a new technology available to springmakers and spring users. The intent of this paper is to utilize existing spring manufacturing and analysis techniques to further the understanding of how a spring's fatigue performance can be enhanced and/or changed by modifying residual stress levels.

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Topics of Interest

The welding process induces residual tensile stress that is detrimental to fatigue life. Tensile stresses act to stretch or pull apart the surface of the material. With enough load cycles at a high...

The measurement of residual stress distributions with depth is critical to understanding the impact of machining, shot peening, induction hardening, and similar processes on fatigue performance. The...

One of the advantages of ultrasonic techniques for residual stress measurement is that they are non-destructive. Using such techniques, one can measure the residual stresses in the same points many...

The deep stable layer of compressive residual stress produced by low plasticity burnishing (LPB) has been demonstrated to improve the damage tolerance in engine alloys IN718, Ti-6Al-4V, and 17-4PH.

High cycle fatigue (HCF) performance of turbine engine components has been known for decades to benefit from compressive surface residual stresses introduced through shot peening. However, credit for...