Servohydraulic Testing Machine HA from 50 to 500 kN

Actuator in the Lower Crosshead 

Standard versions of the HA series fatigue testing machines in the 50 to 500 kN range have the testing actuator mounted in the lower crosshead, below the test area. They are ideal for test arrangements that require temperature chambers or furnaces to be installed in the test area. The positioning of the actuator prevents heated air from rising and causing heating of the actuator; it also prevents oil from dripping into the heated test area.

LCF (low cycle fatigue) testing is among the tests that can be performed using the HA load frame.

Servohydraulische Prüfmaschine der HA-Baureihe für Dauerschwingversuche

Technical Overview

The HA fatigue testing machine's test frame features extremely high stiffness, resulting in natural resonance. To avoid unwanted flexural stresses in the specimen the load frames are accurately aligned.

Description

  • HA series servohydraulic testing machines are available in various sizes for test loads from 50 kN to 500 kN.
  • The standard testing actuator stroke is 100 mm or 250 mm.
  • The servohydraulic testing machine can be supplied for 210 bar or 280 bar system pressure.
  • The load cell is attached to the upper crosshead as standard.
  • The upper crosshead is adjustable. It can be optionally equipped with a hydraulic crosshead clamping and lift cylinders.

Advantages & Features

  • 4 standard nominal ratings from 50 kN to 500 kN
  • convenient working height
  • particularly suitable for integration of a high-temperature heating device
  • hard-chromed columns for precise guidance of upper crosshead
  • hydraulic clamping and adjustment for easy positioning of upper crosshead
  • integrated oil-sump for collecting minor leakage
  • safety housing to comply with CE Machinery Directive depending on application

Technical Data

Dynamic nominal force

50

100

250

500

kN

Crosshead clamping

electro-hydraulic

electro-hydraulic

electro-hydraulic

electro-hydraulic

Crosshead adjustment

electro-hydraulic

electro-hydraulic

electro-hydraulic

electro-hydraulic

A - max. height of test frame

2750 (3250)[1]

2750 (3250)[1]

3040 (3540)[1]

3430 (3930)[1]

mm

AK - tilted dimension for installation

2820 (3320)[1]

2820 (3320)[1]

3195 (3695)[1]

3650 (4125)[1]

mm

B – max. width of test frame

1079

1079

1179

1525

mm

C – max. depth of test frame

780

780

790

1390

mm

D1 – column spacing

565

565

670

800

mm

E – column diameter

80

80

100

120

mm

F - height of top edge of lower crosshead[2]

1010

1010

1030

1020

mm

G – max. test area height[3]

1450 (1950)[1]

1450 (1950)[1]

1750 (2250)[1]

2000 (2500)[1]

mm

H – max. working test area height[4]

1372 (1872)[1]

1372 (1872)[1]

1659 (2159)[1]

1900 (2400)[1]

mm

J – crosshead displacement range

1000 (1250)[1]

1000 (1250)[1]

1150 (1400)[1]

1250 (1400)[1]

mm

Weight[5]

920 (970)[1]

920 (970)[1]

1520 (1600)[1]

3600 (3720)[1]

kg

Frame stiffness with crosshead separation 1000 mm

673

673

967

2100

kN/mm

Suitable for actuators with maximum stroke

250

150

150

100

mm

Item Number

Standard height

039825

025238

924810

935267

Extra-high + 500 mm

073968

935832

073969

073970

  1. Variant with height increased by 500mm
  1. With vibration-damping feet
  1. Distance between upper and lower crossheads
  1. Distance between piston flange and upper crosshead with piston retracted
  1. Weight without actuator, load cell or any fixtures

Layout

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Layout der servohydraulischen Prüfmaschine HA-Baureihe

Video

3:00

Dynamic Testing with ZwickRoell

Dynamic Testing of a snow ski, bicycle crank arm, motorcycle drive chain, automobil crankshift, compact-tension specimen

Servohydraulic Components

Description

The final element in our dynamic testing product portfolio is the manufacture of all the necessary accessories such as hydraulic power packs, servohydraulic testing actuators, or hydraulic distribution units. Our portfolio is constantly being expanded through a program of continuous development and inclusion of new products, allowing us to satisfy our customer’s most demanding quality requirements while continually improving the quality of our products.

Hydraulic Power Packs

Hydraulic power pack 40 l/min without noise protection

The HP series power packs feature high operational reliability and long service life. All components are mounted on top of the oil tank for easy access.

The self-priming radial-piston pump is driven by an asynchronous motor. The nine pistons are in hydrostatically balanced contact with the stroke ring. Flow rate is regulated by the stroke-ring eccentricity, which is adjusted via two control pistons located opposite each other. The pressurized oil is routed via a high-pressure filter and is then available to the appliance. A factory-set pressure relief valve prevents excessive increases in pressure.

Servohydraulic Testing Actuator

Testing actuator LH2500
ZwickRoell's servohydraulic testing actuators feature sturdy, robust construction and are used both in servohydraulic testing machines and as single testing actuators, for example on a clamping plate. When used in conjunction with a servo valve they enable complex loading sequences to be implemented with great accuracy. 

Hydraulic Distribution Unit

Distribution unit
The hydraulic distribution unit is the electrically operated switching device in servohydraulic testing machines. It connects or disconnects the hydraulic pressure for a servohydraulic testing actuator or servohydraulic testing machine. A connecting valve is allocated to each consumer, allowing them to be switched independently of each other. The modular design enables addition of an extra switching manifold whenever required.

Downloads

Investigating material behavior in high-pressure hydrogen atmosphere

MPA Stuttgart is engaged in research and development activities to describe the behavior of materials under extreme loading conditions. For its investigations into the behavior of materials in a high-pressure hydrogen atmosphere MPA has opted for a special servo-hydraulic testing system by ZwickRoell.
MPA1
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