250KN Electro-hydraulic Servo Dynamic Static Fatigue Testing System

The hydraulic servo fatigue testing machine stands as a cornerstone of modern materials science and engineering, designed to evaluate the durability, strength, and fatigue resistance of materials and components under repeated mechanical stress. By simulating real-world cyclic loading conditions—such as those experienced by aircraft parts, automotive components, or industrial machinery—it provides critical data to ensure product reliability and safety..

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Application

The hydraulic servo fatigue testing machine stands as a cornerstone of modern materials science and engineering, designed to evaluate the durability, strength, and fatigue resistance of materials and components under repeated mechanical stress. By simulating real-world cyclic loading conditions-such as those experienced by aircraft parts, automotive components, or industrial machinery-it provides critical data to ensure product reliability and safety.

Standards

ASTM E399－09 Metallic materials Kic standard test for linear elastic plane strain fracture toughness

ASTM E1820 2001 test standard for measuring fracture toughness

Key components include:

Hydraulic Power Unit (HPU): Supplies pressurized hydraulic fluid to drive the actuation system.
Actuator: Converts hydraulic energy into linear or rotational motion to apply load to the test specimen.
Load Cell/Transducer: Measures real-time force or torque, feeding data back to the control system.
Servo Controller: Adjusts valve operations based on feedback, ensuring loading parameters stay within predefined tolerances.
Test Fixtures: Customizable clamps or grips to secure specimens (e.g., metals, composites, or polymers) and align them with the actuation axis.

Servo actuator

Maximum test force: ±250KN

Maximum stroke: ±75mm (total stroke 150mm);

Special dynamic servo actuator for dynamic and static test;

Double-out rod, the surface of the piston rod is treated with special technology, and special technology is adopted for high-quality finish treatment, which is suitable for long-term dynamic test;

The high-speed sealing element (German Trelleborg Servo Glyd ring, Sterling) is used to seal between the piston and the cylinder body, the piston rod and the end cover. And choose high-speed wear-resistant support ring (German Trelleborg) support, which makes the actuator rigid,

Strong anti-direction finding ability;

The actuator has built-in displacement sensor, external electro-hydraulic servo valve and force sensor, with two closed-loop control loops of force and displacement;

The force sensor is placed on the head of the piston rod, and the prestressing ring is installed and configured, which can fully ensure the safety and reliability of the connection during the dynamic test;

Fatigue Testing Machine

Specifications

Model	KASON HDT-255A
Force capacity	250kN
Load range	2%-100%FS
Testing machine accuracy	Static indication accuracy: ±0.5% Dynamic loading accuracy: ±1%
Actuator dynamic stroke	150mm
Displacement measuring range	0～150mm(±75mm)
Displacement measurement resolution	0.001mm
Deformation indication relative error	±0.5%
Force coaxiality	≤5%
Frequency Range	0.01-20HZ (50Hz optional)
Effective distance between columns	762×310mm
Maximum test space	1200mm (exclude hydraulic clamps)
Main test waveforms	Sine wave, square wave, triangle wave, ramp wave, random waveform and external input waveform; can realize multiple sine wave forms with different frequency or amplitude combinations; random wave forms with user-defined parameters; user-imported custom wave forms
Test control method	Load, displacement, deformation control method
Servo pump station specifications	Flow 100L/min, 21Mpa
Power supply	AC 380V± 10%, 50Hz

Hydraulic servo pump station and electrical control system

Sheet metal closed frame structure with sound insulation design;Ø

Total flow 100L/min, pressure 21Mpa.

The pump station uses a silent variable piston pump from Germany Rexroth Company , which is immersed in the hydraulic medium together with a special liquid-immersed motor imported from Italy. It can automatically adjust the hydraulic flow according to the system flow demand, while reducing noise and avoiding vacuuming at low temperatures. Protect and extend equipment life. When the hydraulic power source is working at full load, the audible noise at a distance of 1 meter does not exceed 65 decibels, which meets the on-site requirements of the laboratory and does not require a separate sound insulation device or oil source room.

fatigue dynamic test

Test software function introduction

Fatigue test (low cycle fatigue, high cycle fatigue)
Stress control,Strain Control,Constant amplitude fatigue,Amplitude fatigue,Frequency conversion fatigue
Simulate the measured waveform,Random waveforms and external input waveforms; random waveforms with user-defined parameters; custom waveforms imported by users;
Multiple sine waveforms with different frequencies or amplitude combinations;

software1

Technical Advantages

What sets hydraulic servo fatigue testers apart is their versatility and precision in extreme conditions. They excel in:

High-Force Applications: Capable of exerting massive loads, making them ideal for testing structural materials like steel or aerospace alloys.
Dynamic Control: Maintaining stable loading even at high frequencies, critical for simulating fatigue over millions of cycles.
Environmental Adaptability: Many models integrate temperature chambers, corrosion baths, or vacuum systems to test materials under harsh or specialized environments.

Applications Across Industries

From aerospace to civil engineering, these machines are indispensable:

Aerospace: Testing turbine blades, landing gear, and airframe components to withstand cyclic stress during flight.
Automotive: Evaluating engine parts, suspension systems, and chassis materials for long-term durability.
Materials Science: Characterizing fatigue limits of new alloys, composites, or polymers to optimize their use in structural applications.