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.
LTM electro-dynamic testing machine

Key Advantages and Features

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.

Technical Overview

LTM 5/10 

Description

LTM 5           Standard

LTM 5           + 250 mm[1]

LTM 10           Standard

LTM 10           + 250 mm[1]

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[2]

100

100

100

100

Hz

Load frame

Frame stiffness at 1000mm crosshead separation

300

kN/mm

Max. overall height of testing machine (A)[3]

2510

2760

2715

2965

mm

Max. overall height of test frame (B)

1980

2230

1980

2230

mm

Overall width

860

860

860

860

mm

Overall depth

850

850

850

850

mm

Height of mounting table (C)

720

720

720

720

mm

Column diameter

65

65

65

65

mm

Max. test-area height (D)[3]

1106

1356

1106

1356

mm

Frame stiffness at 1000mm crosshead separation

300

300

300

300

kN/mm

Total weight[4]

941

966

1040

1065

kg

Working area

Working-area width

460

460

460

460

mm

Max working area width without load cell (E)[3] [5]

920

1170

920

1170

mm

Max. working area height with load cell (F)[3] [5]

781

1031

781

1031

mm

Top crosshead adjustment

Motorized

Upper crosshead clamping

Manual

Crosshead clamping electrically monitored

Yes, with signal indicator

Item number

1008107

3001848

1008108

3001847

  1. Extended load frame (required for use with a temperature chamber)
  1. Depending on load ratio (r-ratio) and test amplitude
  1. Highest crosshead position
  1. Testing machine only, without electrical cabinet, accessories and options
  1. Median piston position

Design

LTM electrodynamic testing machine design

testControl II measurement and control electronics

Description

Value

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

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 Zwick testing machine with linear drive for these tests.
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