Note: Motor-piezoelectricity coupling driven high temperature fatigue device

Area of Science:

• Materials Science
• Mechanical Engineering
• Tribology

Background:

• High-temperature fatigue testing is crucial for understanding material behavior in extreme environments.
• Existing devices often lack the capability for simultaneous multimodal loading at elevated temperatures.
• Advanced alloys require sophisticated testing methods to evaluate their performance limits.

Purpose of the Study:

• To design and evaluate a novel high-temperature fatigue testing device.
• To enable simultaneous servo motor and piezoelectric actuator driven loading.
• To perform multimodal fatigue tests with combined static and dynamic loads.

Main Methods:

• The device integrates monotonic and cyclic loading capabilities.
• It features a maximum tensile load of 1800 N and a driving frequency of 50 Hz.
• The maximum service temperature is 1200 °C, allowing tests from room temperature (RT) to 1100 °C.

Main Results:

• The device successfully achieved multimodal fatigue tests with arbitrary static and dynamic load combinations.
• It demonstrated the capability to investigate coupling mechanical behaviors under tensile and tensile-fatigue loading.
• Feasibility was verified through tests on UM Co50 alloys at temperatures up to 1100 °C.

Conclusions:

• The developed high-temperature fatigue device offers a versatile platform for advanced material characterization.
• It enables novel multimodal fatigue testing at extreme temperatures.
• The device is suitable for investigating complex mechanical behaviors of materials like UM Co50 alloys.