Information on the most widely used ASTM standards within the materials testing industry
Model: UTDS, ASTM F1717, ASTM F2706, ISO 12189
In the treatment of spinal diseases, the spinal nail rod system is widely used as an important surgical treatment modality to restore the stability and function of the spine. However, with the increase in surgical patients and the extension of the number of years of surgery, the long-term stability and durability of the spinal nail rod system have become the focus of attention. Spinal injuries usually occur as a result of dislocations or fractures due to rotational, curved, or axial loading conditions. Static tests are used to assess the loads that will result in spinal fractures, while fatigue tests are performed to assess the number of cycles required for failure to occur when a component is subjected to repetitive loads at lower forces.
Lifetime testing of fatigue or spinal structures is crucial because fatigue failure is more common than catastrophic failure. Loads are typically applied in a constant-amplitude, load-controlled sinusoidal waveform that runs more than 5 million times.
General Introduction
In the treatment of spinal diseases, the spinal nail rod system is widely used as an important surgical treatment modality to restore the stability and function of the spine. However, with the increase in surgical patients and the extension of the number of years of surgery, the long-term stability and durability of the spinal nail rod system have become the focus of attention. Spinal injuries usually occur as a result of dislocations or fractures due to rotational, curved, or axial loading conditions. Static tests are used to assess the loads that will result in spinal fractures, while fatigue tests are performed to assess the number of cycles required for failure to occur when a component is subjected to repetitive loads at lower forces.

Lifetime testing of fatigue or spinal structures is crucial because fatigue failure is more common than catastrophic failure. Loads are typically applied in a constant-amplitude, load-controlled sinusoidal waveform that runs more than 5 million times.
The test is performed under sinusoidal load with a maximum test frequency of 5 Hz. This force, in turn, depends on the position of the spine to be modeled. (lumbar spine: 0.6-2.0 kN / neck: 0.05-0.15 kN). The test ends when 5 million duty cycles are reached or when the structure has a mechanical failure. The results of the fatigue test must be summarized with an S-N curve. These tests are performed at ambient temperature, but can also be repeated in a Ringer's solution at 37 °C if necessary to simulate physiological environmental conditions and determine possible corrosion effects.
Key Features
ASTM F1717: Standard Test Methods for Spinal Implant Constructs in a Vertebrectomy Model.
Four test incldue in ASTM F1711
1.1, Static compression bending test
1.2, Static tensile bending test
1.3, Static torsion test
1.4, Dynamic compression bending fatigue test

ASTM F2706, Standard Test Methods for Occipital-Cervical and Occipital-Cervical-Thoracic Spinal Implant Constructs in a Vertebrectomy Model describes static test methods for fatigue tests on occipital-cervical and occipital-cervical-thoracic spinal implants in a vertebrectomy model.
Five test incldue in ASTM F2706
2.1, Static compression bending test
2.2, Static tensile bending test
2.3, Static torsion test
2.4, Dynamic compression bending fatigue test
2.5, Dynamic torsion fatigue test
ISO 12189:2008
Implants for surgery — Mechanical testing of implantable spinal devices — Fatigue test method for spinal implant assemblies using an anterior support
The spinal implant to be tested is securely mounted on a test block made of ultra-high molecular weight polyethylene (UHMWPE). The number of test blocks used simulates the vertebrae. The type and number of test blocks depends on the position of the vertebrae to be simulated. Between the test blocks, springs with specified stiffness values simulate the intervertebral disc and provide additional anterior support as specified in ASTM F1717.

ISO 12189 Dynamic Pedicle System Test Model. Light gray: PE (polyethylene) block simulates vertebral body, blue: connecting rod implant with dynamic section (black spring), dark gray: pedicle screw, red spring: calibration spring simulates intervertebral disc.
1), Servo liner actuator is the key part in this testing machine, the test output load through this actuator; with United Test technology self design, the actuator internally intall on the top side of frame, consist of actuator, servo motor, servo driving sytem, and load cell.
2), Servo liner actuator frequency limitation position have relief area, avoid the damage of out control.
3), Liner sensor with USA Schaevitz company LVDT, move smoothly, piston rod made by extra-fine process, surface chrome-plated polishing to Rα0.4u.
4), Between load cell and clamper connection, push-pull rod and clamper position have specialized gap elimination device, then improve the dynamic response ability.
A new generation fatigue testing system with a large electromagnetic motor as the actuation core;
The direct drive electromagnetic motor operates stably with high repeatability, ensuring precise control of force and displacement;
The built-in electromagnetic actuator has the characteristics of low friction, high repeatability, high system response, and high speed;
Can perform tests such as tensile, compressive, bending, shear, creep, relaxation, etc;
Meet the strict requirements of modern material mechanics testing for high precision, high frequency, high stability, and durability;
It has the characteristics of oil-free, sealless, maintenance free, long service life, high integration, easy installation, and small footprint;
Various fixtures and accessories are available for selection.
1. Environmental Friendliness
No hydraulic oil leakage or pollution
Low noise operation (≤70dB) allows placement in office areas
Energy-efficient (only consumes power during testing)
2. Cost Benefits
Initial investment: Lower than hydraulic systems
Maintenance: No hydraulic fluids, filters, or seals to replace
Running costs: Minimal power consumption
Space savings: Small footprint reduces laboratory space requirements
3. Performance Advantages
Precision: Backlash-free motion with high repeatability
Control flexibility: Smooth transition between load, displacement, and strain control
Safety: Dual-stage drive mechanisms and overload protection
Clean operation: Ideal for testing sensitive materials like medical devices
4. Ease of Use
Ergonomic design: Intuitive touchscreen or PC interface
Quick setup: Easy specimen installation with specialized fixtures
Automation: Programmable test sequences and data logging
Real-time monitoring: Simultaneous capture of force, displacement, strain, and cycle count (up to 10^9 cycles for long-term fatigue testing).
Biomechanical metrics: Automated calculation of fatigue life (S-N curves), modulus degradation, creep-fatigue interaction, and failure mode (brittle vs. ductile).
Compliance with biological testing standards: Pre-programmed test protocols for ISO, ASTM, and FDA guidelines for biomaterials.
Data export: Compatibility with bioinformatics tools for post-test analysis of tissue/biomaterial degradation.
Main Technical Specification
| Max. dynamic load | ±10KN Accuracy ±1% |
| Max. static load | ±10kN |
| Dynamic fluctuation | Less than ±1%FS |
| Actuator max. stroke | ±50mm, accuracy ±0.5%FS |
| Amplitude at Max. frequency | ±1mm |
| Max. Frequency | 0.1HZ~15Hz |
| Max. line velocity | 150mm/s |
| Control mode | Load, displacement, deformation |
| Main test waveform | Sinusoidal wave, triangular wave, square wave, sawtooth wave etc., |
| Pass through Zero | Complete display the pass through zero hysteresis loop curve. |
| Columns number | 2 |
| Vertical space | 750mm |
| Max. test space | 450mm (include test fixture) |
| Test width | 450mm |
| Cooling method | Water cooling |
| Weight | 350kg |
| Dimensions | 785*620*2050mm |
| Standard Power | 380/220V, 50/60HZ, 3 phase, 4Kw |
| Working system | MS Win10 / Win11 |
| Load cell | USA, Vishay Celtron |
Main Accessories
| High Stiffness Frame | 1 set |
| Servo liner actuator | 1 set |
| Servo motor/driver (Japan Panasonic) | 1 set |
| Loadcel: (USA Vishay Celtron) | 1 set |
| LVDT (Japan Tamagawa liner displacement sensor) | 1 set |
| Tensile test fixture (optional according requirement) | |
| Compression platen (100mm) | 1 set |
| Fully digital servo controller | 1 set |
| Professional testing software | 1 set |
| Computer | 1 set |
| Printer | 1 set |
| Documents (Manual, packing list, certificate) | |
Main Structure

UTDS series Electronic Dynamic Universal Testing Machine mainly consist of parts as below:
1, movable loading platform, can 360 degree free adjusting, easy for sample test.
2, Imported actuator, Japan Panasonic driving system.
3, Data collection system, English software, static/dynamic controller.
4, USA Vishay celtron load cell.
6.1 Servo actuator
Actuator mounted on the top pf working table.
● Max. load capacity: 10000N.
● Effective stroke: +/-50mm (total 100mm)
● Actuator include Japan Tamagawa high accuracy displacement sensor.
● Actuator amplitude limitation position designed with buffer zone, avoid the damage caused by out of control.
● Include device to eliminate the gap clearance, minimize the side force, reduce the impact during high frequency test.

6.2, Load cell
● Use the USA Vishay Celtron load cell, 10KN, overload capacity 150%, mounted at front end of actuator piston, with self-lock nut.
● Calibrated before delivery.
6.3, Data collection system and controller
Servo control system include fully digitally servo controller, computer, software etc.,
1)Controller main consist of:
● Controller frame SUPERTEST T8.3, max. upgrade to 6 channel.
● With two sensor signal unit (load, displacement)
● Signal generator unit
● Computer
2)Controller frame SUPERTEST T8.3 specification:
● Control unit: fully digital PIDF control.
● Frequency range: 0.01 ~15HZ, resolution: 0.01Hz
● Control waveform: Sine wave, Triangle wave, square wave, oblique wave, half of wave etc.,
● Control mode: Load, displacement close-loop control.
● System with load cell calibration, zeroing etc., function.
3)Main function of controller:
● Controller with various corresponding software suite, can meet kinds of different test requirement.
● With calibration system to help customer to calibrate the machine easily.
With multi-control mode, can realize smooth swift, with automatically zeroing, save and recover PID setting, automatically data collection, sample protection function etc.,
Software
Main interface:



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