لخّصلي

The study employed a self-developed 50t multi-axis fatigue electro-hydraulic servo test system, capable of conducting various tests such as uniaxial dynamic stretching, biax?ial dynamic stretching, uniaxial tensile fatigue, and three-point bending fatigue tests, as presented in Figure 1a.The equipment is jointly developed by Shenyang Aerospace Univer?sity and Shenyang Hongderun HVAC Equipment Co., Ltd., including a low-temperature chamber, a universal testing machine from Changchun Xintai Testing Machine Co., Ltd., Polymers 2023, 15, 1648 3 of 14 and self-made three-point bending fixtures.

The study employed a self-developed 50t multi-axis fatigue electro-hydraulic servo
test system, capable of conducting various tests such as uniaxial dynamic stretching, biax￾ial dynamic stretching, uniaxial tensile fatigue, and three-point bending fatigue tests, as
presented in Figure 1a. The equipment is jointly developed by Shenyang Aerospace Univer￾sity and Shenyang Hongderun HVAC Equipment Co., Ltd., including a low-temperature
chamber, a universal testing machine from Changchun Xintai Testing Machine Co., Ltd.,
Polymers 2023, 15, 1648 3 of 14
and self-made three-point bending fixtures. The experimental fixture is completely selfdeveloped and can better simulate the common ambient and low-temperature conditions
of the specimen on the aircraft, ensuring the reliability of the test, illustrate as Figure 1b.
A three-point bending fatigue test was conducted with a displacement loading of 10 Hz,
where the minimum displacement was set to 0 mm, the maximum displacement was 1 mm,
and the displacement amplitude was 1 mm, as illustrated in Figure 1b of the specimen
fixture and Figure 1c of the loading curve. This test system enabled the researchers to
accurately simulate the fatigue conditions that the material would experience in real-life
applications, providing reliable data for the analysis of the material’s fatigue behavior.