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HB series servohydraulic testing machine

Actuator in the upper crosshead Download
  • Components
  • Metals
  • Automotive
  • Medical
  • Academia
  • Construction materials
Test load
  • 50 - 2,500 kN
Type of test
  • Fatigue
  • Fracture mechanics
  • ISO 12106
  • ASTM E606
  • DIN 50100
  • ASTM E399
  • ASTM E647
  • ASTM E466

The perfect testing machine for fatigue tests on components

Standard versions of the HB load frame in the 50 to 2,500 kN range have the testing actuator located above the test area. The version with integrated T-slotted platform allows flexure tests and component testing to be performed in addition to standard high cycle fatigue tests.

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

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.

Fatigue test on welded steel specimens

Many welded components are subjected to cyclic loads, which is why these welded connections are tested using a dynamic fatigue test. Typically, these specimens cannot be clamped centrally in the specimen grips. The hydraulic grips shown here are ideal for this application, as the offset can be adjusted with the grips.

Advantages & Features

Advantages & Features

Advantages & Features


These 2-column load frames are designed for materials and component testing under dynamic loading in a closed force-flow. The frame is supported on vibration-isolating leveling units so that no appreciable forces are transmitted to the floor during normal operation. Where tests or environmental conditions are critical in nature, the use of optionally available air-springs is advisable; these have a natural frequency of approximately 3 - 6 Hz.

The efficiency of the testing system is enhanced by the especially high axial and lateral stiffness of the HB load frames, enabling higher frequencies and specimen deformations Moreover, high lateral forces which may occur in compression and flexure tests can be absorbed without difficulty.

The frames also feature extremely precise alignment; Following installation of the testing actuator and load cell, alignment accuracy is +0.1 mm per meter separation; at distances below 350mm the offset is constant at 0.05mm. Plane-parallelity of mounting surfaces is equal to or better than 0.03 mm per 100 mm. All fixtures and ZwickRoell load cells are mounted via flanges with centering-spigot.

Advantages & Features

  • 4 standard nominal ratings from 50 kN to 2500 kN
  • testing actuator mounted on upper crosshead
  • convenient working height
  • hydraulic clamping and adjustment for easy positioning of upper crosshead
  • comprehensive range of accessories, including hydraulic grips, compression platens, flexure test kit etc.
  • safety housing for compliance with CE Machinery Directive
  • version with integrated T-slotted specimen ideal for fatigue tests on components

Technical overview

Advantages & Features

Advantages & Features

Hydraulic power packs
servohydraulic actuator
Hydraulic connection unit
Hydraulic power pack 40 l/min without noise protection

Hydraulic power packs

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.


Testing actuator LH2500

servohydraulic actuator

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.


Distribution unit

Hydraulic connection 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.


Related products and accessories

Common fatigue tests

Materials and components may fail prematurely under oscillating loads. For this reason, the behavior of materials under alternating mechanical loading is an important decision criterion, for which the necessary data are obtained through testing.

There are two categories of fatigue in materials testing:

Low cycle fatigue (LCF) test
ISO 12106, ASTM E606
to Low cycle fatigue (LCF) test
High Cycle Fatigue Test / S-N Test
DIN 50100
to High Cycle Fatigue Test / S-N Test


Name Type Size Download
  • Product information: HB series servohydraulic testing machine PDF 378 KB
  • Product information: Hydraulic distribution unit PDF 396 KB
  • Product information: Hydrostatic single testing actuator 10-50 kN PDF 540 KB
  • Product information: Hydrostatic single testing actuator 100-1000 kN PDF 480 KB
  • Product information: 20 l/min. hydraulic power pack PDF 567 KB
  • Product information: 40 l/min. hydraulic power pack PDF 567 KB
  • Product information: 80 l/min. hydraulic power pack PDF 598 KB
  • Product information: 170 l/min. hydraulic power pack PDF 391 KB
  • Product brochure: Dynamic PDF 5 MB

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