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Multi‐Axis Fatigue Torsional & Bending testing system

Multi‐Axis Fatigue Torsional & Bending testing system

Model: UTDST, dual axis test

UnitedTest UTDST series Multi‐Axis Fatigue Torsional & Bending testing system understake this task, used to check the torsion and bending, tension test for the Intramedullary lengthening nail/Intramedullary leg lengthening implants nails. 


Fatigue in intramedullary implants causes severe complications due to the failure of implants and related operation during the consolidation phase. This work succeeds in developing a test fixture and procedure for inducing three‐dimensional loading in order to define the fatigue life of an implant. The fatigue can be analyzed for various osteotomy locations and for various load spectra based on the estimates made for a patient or patient group. The fixture induces reliable loadings at cycle rates up to 2 Hz. 

General Introduction

UnitedTest UTDST series Multi‐Axis Fatigue Torsional & Bending testing system understake this task, used to check the torsion and bending, tension test for the Intramedullary lengthening nail/Intramedullary leg lengthening implants nails. 


Fatigue in intramedullary implants causes severe complications due to the failure of implants and related operation during the consolidation phase. This work succeeds in developing a test fixture and procedure for inducing three‐dimensional loading in order to define the fatigue life of an implant. The fatigue can be analyzed for various osteotomy locations and for various load spectra based on the estimates made for a patient or patient group. The fixture induces reliable loadings at cycle rates up to 2 Hz. 


Currently, the ASTM F1264 standard provides the test methods for studying the mechanical performance of intramedullary fixation devices and defines the test procedure for four‐point bending tests. The existing test methods are suited for studying torsional and relative bending performance separately in a single load mode at a time. The four‐point bending test fixture induces localized surface loads and results in an unrepresentative loading‐deformation especially in an implant that is hollow. 

Multi‐Axis Fatigue TorsionalMulti‐Axis Fatigue Torsional
   Bottom bending fixture ratation in 45o, meantime vertical compression loading

Key Features

  • Actuator
  • Standard
  • Features
  • Advantages
  • Data Acquisition & Analysis for Biomaterials

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.

ASTM F1264-16e1 

Standard Specification and Test Methods for Intramedullary Fixation Devices


ISO 7206-4: Implants for surgery -- Partial and total hip joint prostheses -- Part 4: Determination of endurance properties of stemmed femoral components.

ISO 7206-6: Implants for surgery -- Partial and total hip joint prostheses -- Part 6: Determination of endurance properties of head and neck region of stemmed femoral components.

ISO 7206-8: Implants for surgery -- Partial and total hip joint prostheses -- Part 8: Endurance performance of stemmed femoral components with application of torsion.

ASTM F2580: Standard test method for evaluation of modular connection of proximally fixed femoral hip prosthesis.

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 (e.g., MATLAB, Python) for post-test analysis of tissue/biomaterial degradation.

Main Technical Specification

Max. dynamic load±10KN Accuracy ±1%
Max. static load±10kN
Torque measuring range1Nm~50Nm
Torque resolution0.01o
Rotate range±45o (0.1HZ)
Torsion frequency±10o, 5HZ
Dynamic fluctuationLess   than ±1%FS
Actuator max. stroke±30mm,   accuracy ±0.5%FS
Amplitude at Max. frequency±1mm
Max. Frequency0.1HZ~15Hz
Max. line velocity150mm/s
Control modeLoad,   displacement, deformation
Main test waveformSinusoidal   wave, triangular wave, square wave, sawtooth wave etc.,
Pass through ZeroComplete   display the pass through zero hysteresis loop curve.
Columns number2
Vertical space750mm
Max. test space450mm   (include test fixture)
Test width450mm
Cooling methodWater cooling
Weight350kg
Dimensions785*620*1650mm
Standard Power380/220V,   50/60HZ, 3 phase, 4Kw
Working systemMS Win10 / Win11


Main Accessories

High Stiffness Frame1 set
Servo liner actuator1 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 controller1 set
Professional testing software1 set
Computer1 set
Printer1 set
Documents (Manual, packing list, certificate)


Main Structure


Electronic Dynamic Testing Machine/Cyclic Testing Equipment


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. 


Electronic Dynamic Testing Machine/Cyclic Testing Equipment

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: 


Electronic Dynamic Testing Machine/Cyclic Testing Equipment

Electronic Dynamic Testing Machine/Cyclic Testing Equipment

Electronic Dynamic Testing Machine/Cyclic Testing Equipment

Standard

ISO 14879-1 Fatigue test of metallic tibial trays of total knee joint replacement system

ISO 14879 - 1 is a core international standard formulated by the International Organization for Standardization (ISO) for the mechanical performance evaluation of metallic tibial trays in total knee replacements (TKR). The standard covers two major types of tests: static mechanical testing (to evaluate the ultimate load - bearing capacity and stiffness of the tibial tray) and cyclic fatigue testing (to simulate long - term physiological loading and assess durability).

ASTM F1800 Knee Tibial tray Fatigue testing

ASTM F1800 Cyclic Fatigue Testing of Metal Tibial Tray Components of Total Knee Joint Replacements, covers a procedure for the fatigue testing of metallic tibial trays used in knee joint replacements using a cyclic, constant-amplitude force. It applies to tibial trays that cover both the medial and lateral plateaus of the tibia. This practice may require modifications to accommodate other tibial tray designs.




ASTM WK51649 Femoral knee component fatigue testing system

ASTM WK51649 Femoral knee component fatigue testing system - Fatigue Testing of Total Knee Femoral Components Under Closing Conditions

ASTM WK51649 is a draft standard (work item) under development by ASTM Committee F04.22 on Arthroplasty . It proposes a test method for evaluating the fatigue resistance of total knee femoral components under closing conditions, similar in scope to ASTM F3210. (ASTM F3210-22e1 Standard Test Method for Fatigue Testing of Total Knee Femoral Components Under Closing Conditions)


ASTM WK51649 Fatigue testing of the metal femoral component of a total knee joint prosthesis is conducted to establish the F-N curve at different load levels and to determine the fatigue limit of the sample under 10 million cycles. 

ASTM F2077 Intervertebral body fusion devices testing

ASTM F2077-22: Standard Test Methods for Intervertebral Body Fusion Devices

ASTM F2077 test method covers the materials and methods for the static and dynamic fatigue testing of intervertebral body fusion devices, spinal implants that are designed to promote arthrodesis at a given spinal motion segment. Intervertebral body fusion cages are among this implant type.

Axial-Compression

Compression-Shear

Torsion Testing

ASTM F2777 knee bearing (tibial insert) endurance fatigue test and deformation under high flexion – ASTM F2777 knee bearing (tibial insert) endurance fatigue test and deformation under high flexion


Used to evaluate the durability and deformation performance of knee joint pads under high bending load conditions. It simulates the stress and deformation of the knee joint during daily activities, such as walking, running, and the impact and pressure experienced during sports. During the tests, specific testing equipment and simulated physical movements are used to apply continuous and high-frequency loads to the knee joint, mimicking actual usage scenarios. By assessing the performance variations of knee joint pads under different bending cycles, such as deformation resistance, rebound performance, and durability, it is possible to determine the quality and lifespan of the pads, providing a basis for the design and improvement of knee protection products. This testing method is of great significance for the research and development as well as quality control of knee protection devices and sports goods.

ASTM F2996 Finite Element Analysis (FEA) of Non-Modular Metallic Orthopaedic Hip Femoral Stems Fatigue testing

ASTM F2996 Standard Practice for Finite Element Analysis (FEA) of Non-Modular Metallic Orthopaedic Hip Femoral Stems

ASTM F2996 standard establishes requirements and considerations for developing Finite Element models to evaluate static implant stresses and strains of non-modular metallic orthopaedic hip stem designs. It can be used for worst-case assessment within a family of implant sizes to reduce the need for physical testing. The boundary conditions are set-up according to ISO 7206-4.

Compliance with Industry Standards

Compliance with Industry Standards


StandardApplication
ASTM F1813Fatigue testing of metallic bone plates/screws
ISO 10993-14Mechanical testing of degradable biomaterials
ASTM D7137Flexural fatigue of polymer biomaterials
ISO 7206-4Fatigue testing of hip joint implants (low-force components)
FDA 21 CFR Part 860Biomechanical testing of medical devices (tissue-engineered products)


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