Resonant Testing Machine(DC Series)
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DC Series(GPS Series) Resonant Testing Machine
An electromagnetic excitation resonance type fatigue testing equipment based on the principle of mechanical resonance.
The electromagnetic resonance fatigue testing machine system is an electromagnetic excitation resonance type high frequency dynamic testing system.This system uses electric energy to drive servo motors to achieve static loading, and uses elastic structures such as electromagnets and bow rings to form a resonance mechanism.
The automatic control system is composed of sensors, computer, and controller. Combined with high-frequency phase detection theory, it can achieve high load and low power consumption loading tests at high frequencies, greatly reducing test time and testing costs.
Test Load
- Ultra-highfrequency range: 60Hz~400Hz;
- Superstrong load capacity: 500N~1000kN;
Type of Test
Fatigue(Tensile, Compression, Bending, Shearing, etc.); Fatigue Crack Growth; Fracture mechanics; CTOD (Crack Tip Opening Displacement); High-cycle Fatigue (HCF); Low-cycle Fatigue (LCF)
Test workpiece:
Metal, bolts, chains, connecting rods, gears, sucker rods, steel bars, hexagonal bars, etc
Test standard:
DIN 50100, ASTM E399, ASTM E466, ASTM D7774 , ASTM D7791, ASTM D4482, ISO 6892,
also compliant with ISO 1099 for axial force-controlled fatigue testing at ambient temperature.
AVAILABLE MODELS
DC-0025: ±25kN
DC-0100: ±100kN
DC-0250: ±250kN
DC-0500: ±500kN
DC-1000: ±1000kN
SINOTEST Electromagnetic Resonance Testing Machine
Detailed Specification of high frequency fatigue testing machine
- Tensile grip for CT (compact tension) specimens.
- Bending fixture for SEB (single edge bending) specimens.
- Chain fixture
- 3/4 Point Bending Fixture
- Compression fixture
The Electromagnetic Resonance High-Frequency Fatigue Testing Machine is primarily designed for evaluating the fatigue and fracture mechanics properties of metallic materials and components. Specifically, it performs tensile, compressive, and tension-compression alternating load tests, as well as high-frequency fatigue crack pre-cracking, in accordance with ASTM E466 and ASTM E399.
Key Applications
In terms of material testing, this electromagnetic resonance fatigue testing machine is mainly used to assess the fatigue fracture performance of various metallic materials—including steel, aluminum alloys, and high-temperature alloys—by generating S-N curves and determining fatigue limits under high-cycle loading conditions.
When equipped with specialized fixtures, the system extends its capability to component-level fatigue testing. Typical test workpieces include gears, chains, rivets, bolts, sucker rods, and automotive connecting rods, making the machine widely applicable across aerospace, automotive manufacturing, and metallurgical industries.
Environmental Capabilities
To accommodate diverse testing requirements, the system can be integrated with a range of environmental accessories:
Low/High Temperature Testing: When equipped with an environmental chamber, the high frequency fatigue tester performs tests across a wide thermal range from −70 °C to +350 °C, simulating service conditions from extreme cold to elevated heat.
Ultra-High Temperature Testing: When equipped with an atmospheric furnace, the system supports high-temperature fatigue testing from 300 °C to 1100 °C, making it suitable for thermal-mechanical fatigue evaluation of aerospace and power-generation materials.
Consequently, the DC series high frequency fatigue testing machine delivers a versatile, high-efficiency solution for both ambient and extreme-environment fatigue characterization, trusted by research institutes and industrial laboratories worldwide.
▪FOB
▪CIF
▪Package: Wooden case
Application Standards
The DC series High Frequency Fatigue Testing Machine is fully compliant with a comprehensive portfolio of Chinese national standards, international standards, and specialized test methods. Specifically:
Chinese Standards
JB/T 5488-1991 – High Frequency Fatigue Testing Machine
JJG 556-2011 – Verification Regulation of Axial Force Fatigue Testing Machines
GB/T 2611 – General Requirements for Testing Machines
GB/T 3075 – Metallic materials — Fatigue testing — Axial force controlled method
HB 5287 – Test Method for Rotating Bending Fatigue of Metallic Materials at Elevated Temperature
Core Test Methods
ISO 1099 – Metallic materials — Method of test for the determination of fatigue properties under uniaxial loading conditions
ASTM E466 – Standard Practice for Conducting Force Controlled Constant Amplitude Axial Fatigue Tests of Metallic Materials
ASTM E399 – Standard Test Method for Linear-Elastic Plane-Strain Fracture Toughness of Metallic Materials
ISO 12106 – Metallic materials — Fatigue testing — Axial strain-controlled method
ASTM E606/E606M – Standard Test Method for Strain-Controlled Fatigue Testing
Specialized Performance Tests
ASTM E647 – Standard Test Method for Measurement of Fatigue Crack Growth Rates
ASTM E739 – Standard Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (ε-N) Fatigue Data
Specific Products & Applications
ISO 1143 – Metallic materials — Rotating bending fatigue testing
ISO 3800 – Threaded fasteners — Fatigue testing
ASTM F1717 / ISO 12189 – Standard Specification for Spinal Implant Constructs in a Vertebrectomy Model / Implants for surgery — Mechanical testing of endoprostheses for spinal application
Consequently, the DC series electromagnetic resonance fatigue testing machine provides laboratories with a fully standards-compliant platform for conducting fatigue and fracture mechanics evaluations across a diverse range of metallic materials and components.
Project Case of high frequency fatigue testing machine
Working Principle
The Electromagnetic Resonance High-Frequency Fatigue Testing Machine operates based on the principle of system resonance, with its main unit optimized using a multi-degree-of-freedom mechanical model.
First, the machine forms a mechanical vibration system primarily consisting of the frame, electromagnetic exciter, main vibration spring, force sensor, specimen, and the configured mass of the main vibration system. Subsequently, vibration is excited and sustained by the electromagnetic exciter. When the frequency and phase of the exciting force generated by the exciter align closely with the natural frequency of the vibration system, resonance occurs.
In this resonant state, the inertial force generated by the configured mass acts reciprocally upon the specimen. Consequently, the fatigue test is conducted under precisely controlled, high-frequency cyclic loading. As a result, this electromagnetic resonance fatigue testing machine achieves ultra-high test speeds—typically 60–400 Hz—dramatically reducing test duration and energy consumption compared to conventional servo-hydraulic systems.
Electrical Control System
The DC series High-Frequency Fatigue Testing Machine is equipped with an advanced digital electrical control system that ensures precise, stable, and high-speed operation across all testing modes.
Core Architecture & Performance
At the heart of the system lies a digital control architecture featuring a dual-CPU core unit (FPGA + DSP), which comprises three functional modules: Mean Load Control, Alternating Load Control, and Digital Acquisition. Furthermore, a high-speed Ethernet interface enables stable and reliable data transmission at rates exceeding 200 MHz. In terms of processing power, the system is equipped with a 32-bit internal processor and high-speed D/A and A/D conversion units. Additionally, the standardized modular hardware design ensures both operational stability and ease of maintenance.
Regarding data integrity, the system achieves a maximum sampling frequency of 20 kHz and guarantees distortion-free data transmission at test frequencies below 500 Hz. Moreover, the I/O architecture supports expansion for both analog and digital measurement channels: the analog module features an adjustable gain amplification module for 20 kHz AC/DC excitation, while the digital module accepts Encoder and SSI signals.
Control Modules
The Mean Load Control Module is driven by an AC servo motor with stepless speed regulation. Specifically, it implements Digital PID closed-loop control, delivering high precision and strong anti-interference capability. Consequently, static tests—including tension, compression, and bending—can be performed via this closed-loop system.
The Alternating Load Control Module processes load cell signals through the high-speed acquisition module, handling decomposition, signal processing, and phase control. In real time, pulse signal adjustment controls the power amplifier and electromagnet to achieve stable loading. Furthermore, a complete closed-loop system is formed via load sensor feedback, ensuring smooth and precise alternating load control.
The Data Acquisition Module is responsible for the acquisition, signal processing, calculation, and storage of sensor data—covering load, displacement, and deformation. As a result, all critical test parameters are captured with high fidelity, supporting comprehensive post-test analysis and reporting.
Ultimately, this integrated electrical control architecture enables the electromagnetic resonance fatigue testing machine to deliver exceptional control accuracy, data integrity, and operational reliability across the full spectrum of fatigue and fracture mechanics tests.
Electrical Control System
The DC series High-Frequency Fatigue Testing Machine comes equipped with the GPSTestExpert V2.0 Dynamic Test Software, a powerful and flexible platform designed to streamline fatigue test operations and data management.
At the core of the software is a modular architecture that decouples the user interface from testing functions and algorithms. Consequently, this design enhances system flexibility and simplifies future upgrades. Furthermore, the platform supports multi-tasking parallel processing, simultaneously handling load control, data acquisition, analysis, processing, and visualization/storage without performance bottlenecks.
In terms of data analysis, the software utilizes advanced test comparison methods and critical threshold判定 (judgment) to enable data fusion and comparative analysis across multiple test runs. Additionally, an integrated hardware-software validation process employs debugging tools to correct defects and verify both software reliability and algorithm precision.
As a result, the GPSTestExpert V2.0 software empowers the electromagnetic resonance fatigue testing machine with a seamless, high-efficiency user experience—from test setup and execution to comprehensive post-test reporting.
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