LTM Electro-Dynamic Testing Machine

Electro-dynamic testing machines are used to determine material and component fatigue strength in the areas of fatigue life and fatigue limit. Thanks to oil-free drive technology and simple installation, they are ideal for use in medical engineering but also in R&D. Typical examples are tests for hip joints and knee or dental implants. Other applications are tests on standard plastics and composites test specimens as well as aluminum and plastics CT and SEB specimens. The LTM dynamic testing machine series is currently available with loads of ±5 and ±10 kN, as well as a piston stroke of 60 mm.

Return to product overview

Quick links:

Videos
Technical overview
Medical applications
Related Products

Downloads

News

02.08.2018

Dynamic Test Methods for Running Shoes

Flexible use for static and dynamic tests

Optimum drive characteristics thanks to a broad speed range of 0.016 mm/s to 1.5 m/s.

Optimum positioning of travel measurement system for accurate test results

Load application and travel measurement system are aligned with the test axis, preventing tilting torque and bending moments and resultant travel measurement errors
Minimizes heat drift, yielding more accurate test results

Low-friction slide bearings on piston rod

Minimization of stick/slip effects resulting in more accurate test results even when amplitudes are low

Maintenance-free piston break system

No additional costs or downtime for maintenance and adjustment work

Testing frequencies, which equal up to 100 Hz, depending on the test, ensure short test times, yielding high specimen throughput.

The linear motor does not require additional supply feeds, such as pneumatic, coolant, or oil. This reduces service and installation costs.

Operation is via testXpert® R for dynamic tests and testXpert® II for static tests. This software is intuitive and customized to meet testing requirements.

Wear-free components ensure maintenance-free operation.

Videos⁽²⁾

1:45

Fatigue test on spinal implants

Fatigue testing of spinal implants to ASTM F1717-09 with electrodynamic testing machine LTM
1:51

LTM electrodynamic testing machine

Technical Overview

LTM 5/10

Type	LTM 5 Standard	LTM 5 + 250 mm^[1]	LTM 10 Standard	LTM 10 + 250 mm^[2]
Item No.	1008107	3001848	1008108	3001847
Fmax, dynamic	±5	±5	± 10	± 10	kN
Fmax, static continuous	±3.5	±3.5	± 7	± 7	kN
Piston stroke	60	60	60	60	mm
Positioning and repeat accuracy	±2	±2	±2	±2	μm
Speed range	1	1	1	1	mm/min
	1.5	1.5	1.0	1.0	m/s
Maximum frequency^[3]	100	100	100	100	Hz
Load frame
Overall height of testing machine, max. (A)^[4]	2510	2760	2715	2965	mm
Overall height of test frame, max. (B)	1980	2230	1980	2230	mm
Overall width	860	860	860	860	mm
Overall depth	850	850	850		mm
Height of mounting table (C)	720	720	720	720	mm
Column diameter	65	65	65	65	mm
Test-area height, max. (D)^[4]	1106	1356	1106	1356	mm
Frame stiffness at 1000mm crosshead separation	300	300	300	300	kN/mm
Total weight^[5]	941	966	1040	1065	kg
Working area
Working-area width	460	460	460	460	mm
Working area width without load cell, max. (E)^[4] ^[6]	920	1170	920	1170	mm
Working area height with load cell, max. (F)^[4] ^[6]	781	1031	781	1031	mm
Top crosshead adjustment	Motorized
Top crosshead clamping	Manual
Crosshead clamping electrically monitored	Yes, with signal indicator

Extended load frame (required for use with a temperature chamber)

Extended load frame - required when using a temperature chamber

Depending on load ratio (r-ratio) and test amplitude

Highest crosshead position

Testing machine only, without electrical cabinet, accessories and options

Median piston position

Design

testControl II measurement and control electronics

testControl II measurement and control electronics
Control frequency	10 kHz
Measured value acquisition	10 kHz, 24 bits, arithmetical
Slots	5 x module bus
PC interface	GigaBit Ethernet
Integrated safety concept	- 2-channel specification for maximum safety
	- interface for interlocked safety doors
	- Emergency Stop link interface
Display-equipped remote control unit	set-up or testing mode
	- Emergency Stop button
	key-switch for switching between setup and testing modes
Dimensions
Height	750	mm
Width	600	mm
Depth	600	mm
Weight approx.	102	kg
Length of cable between LTM & testControl II	500	mm
Protection class	IP 54

Typical Applications in the Medical Industry⁽⁴⁾

Test fixture for spinal implants

For tests to ASTM F1717

Test fixture for spinal implants

For tests to ASTM F1717
Test fixture for dental implants

For tests to ISO 14801

Test fixture for dental implants

For tests to ISO 14801
Test fixture for hip prostheses

For tests to ISO 7206-4, ISO 7606-6, ISO 7206-8 and ASTM F2068

Test fixture for hip prostheses

For tests to ISO 7206-4, ISO 7606-6, ISO 7206-8 and ASTM F2068
Test fixture for spinal implants

For tests to ASTM F 2077

Test fixture for spinal implants

For tests to ASTM F 2077

Medical product safety and reliability enhanced through innovative testing technology

Fatigue tests are an essential element in the development of durable, safe and reliable implants. Prototypes undergo extensive testing before entering the validation process; Komet Medical, the surgical division of Gebr. Brasseler based in Lemgo, Germany, uses a ZwickRoell testing machine with linear drive for these tests.