What Are Wöhler Curves?
Wöhler curves, also known as S-N curves, describe the relationship between cyclic stress amplitude (S) and the number of cycles to failure (N) in a material. They are a fundamental tool for evaluating fatigue performance and durability under repeated loading conditions.
Wöhler Curves for SMA Fatigue Performance
In Shape memory alloys (SMAs) and actuator materials, Wöhler curves help engineers assess how cyclic stress influences functional and structural fatigue life. By analyzing S-N curves, it is possible to determine safe operating stress levels, predict component lifetime, and optimize actuator design for long-term reliability.
Using Wöhler Curves in Actuator Design
Wöhler curves are widely used in fatigue testing, material characterisation, and actuator performance validation across aerospace, robotics, automotive, and industrial applications.