Servohydraulic load frames up to 2,500 kN

Test load

10 kN - 25 kN (HC)
50 kN - 500 kN (HA)
50 kN - 2,500 kN (HB)

Type of test

Fatigue
Fracture mechanics
LCF

Standards

ISO 12106
ASTM E606
DIN 50100
ASTM E399
ASTM E647
ASTM E466

Description Videos Benefits Technical overview Accessories Software

Servohydraulic load frames

The load frames of ZwickRoell’s servohydraulic testing machines have been specially designed for specific fatigue testing requirements, which is reflected in their high frame stiffness, among other things. They are used to determine material characteristic values under vibrating loads, including S-N tests (high cycle fatigue tests), LCF tests (low cycle fatigue) or fracture mechanics tests.

Depending on testing requirements and the need for ergonomic working conditions in everyday tests, the testing actuator is mounted either above or below the test area.

A separate hydraulic power pack is required for the servohydraulic load frames. ZwickRoell offers hydraulic power packs with different power levels, allowing the servohydraulic load frames to be adapted to specific customer requirements.

HC series up to 25 kN HA series up to 500 kN HB series up to 2,500 kN

Servohydraulic load frames from 10 kN to 2,500 kN

HC series up to 25 kN

While the load frames of the HA and HB series are floor-standing, allowing equipment assembly at an optimum operating height, the servohydraulic load frames of the HC series, both 10 kN and 25 kN, are table-top models. A matching concrete base ensures ergonomic working height.

In the servohydraulic HC table-top load frame, the testing actuator is located above the test area. The hard-chromed T-slot platform in the test area as well as the columns of the test frame are suited for testing under corrosive media.

An optional hydraulic adjustment facilitates the positioning of the upper crosshead.

HA series up to 500 kN

The HA series servohydraulic load frames are available in standard versions (Fmax) 50 kN, 100 kN, 250 kN and 500 kN.

With the testing actuator mounted in the lower crosshead, the HA series represents the typical servohydraulic testing machine used for determining material properties under cyclic loading. It is particularly suitable for tests requiring the use of temperature chambers or high-temperature furnaces.

The upper crosshead is adjustable, with optional hydraulic crosshead clamping and lift cylinders. The testing actuator stroke is 100 mm or 250 mm. The servohydraulic testing machine can be supplied for 210 bar or 280 bar system pressure.

HB series up to 2,500 kN

The HB series servohydraulic load frames are available in standard versions (Fmax) 50 kN, 100 kN, 250 kN, 500 kN, 1,000 kN and 2,500 kN.

In the HB series, the testing actuator is located above the test area. These machines are particularly versatile. 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 load cell can be mounted on the lower crosshead or directly onto the piston rod, depending on the application.

A wide range of acessories, including hydraulic grips, compression platens, flexure test kits, and more, complete the system.

Videos on servohydraulic load frames

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Fracture mechanics test to ASTM E647

The crack growth test to ASTM E647 is performed on CT specimens, for which an HA 250 kN servohydraulic test frame is used. The determined characteristic values are the crack growth da/dN and the threshold value ΔKth.

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Fracture mechanics test to ASTM E399

The fracture strength according to ASTM E399 is determined using a servohydraulic load frame HA 250 kN.

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HB-series: Fatigue test

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.

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HC-series: fatigue test on spinal implant

Fatigue test on spinal implants with an HC10 kN servohydraulic load frame to ISO 12189, ASTM F2077 and ASTM F2347.

Advantages and features

Closed force distribution

The two-column load frames are designed for materials and component testing under vibrating operational conditions with a closed distribution of forces. The frame stands on anti-vibration leveling elements.

Load frame stiffness

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

The high stiffness supports higher frequencies and specimen deformations. In addition, high lateral forces, such as those that can occur during compression and flexure tests, can be absorbed without any problems.

Alignment accuracy

The servohydraulic load frames are aligned with a high level of precision. After installation of the testing actuator and load cell, the alignment accuracy is +0.1 mm per meter distance. At a distance of less than 350 mm, the offset is a constant 0.05 mm. Plane-parallelity of the mounting surfaces is equal to or better than 0.03 mm per 100 mm.

All fixtures and load cells are mounted via flanges with a centering gauge.

Crosshead adjustment

Hydraulic clamping and adjustment simplifies the positioning of the upper crosshead.

Remote control

The entire test, including setup and control of automatic extensometers and specimen grips, is run via the display-equipped remote control.

Operator protection

Regardless of applications, we offer an optional safety housing in compliance with the CE Machinery Directive.

Technical overview

HA series servohydraulic load frame — Comparison of servohydraulic load frames

HB series servohydraulic load frame — Comparison of servohydraulic load frames

	HA series	HB series	HC series

Force levels	50 kN 100 kN 250 kN 500 kN	50 kN 100 kN 250 kN 500 kN 1,000 kN 2,500 kN	10 kN 25 kN
Testing actuator	Lower crosshead	Upper crosshead	Upper crosshead
Alignment fixture	✓	-	✓
Temperature chamber	✓	-	-
High-temperature furnace	✓	-	-
T-slotted platform	-	✓	✓
Typical Applications	S-N tests Fracture mechanics	S-N tests Flexure tests Components	Components Biomedicine

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
A_K – tilted dimension for erecting	2820 (3320)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 crosshead²	1010				mm
G – max. height of test area³	1450 (1950)¹				mm
H – max. height of work test area⁴	1372 (1872)¹				mm
J – crosshead adjustment path	1000 (1250)¹				mm
Weight⁵	920 (970)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 No.
Standard height	039825
Extra high + 500 mm	073968
Item Number
Standard height		025238	924810	935267
Extra-high + 500 mm		935832	073969	073970
A_K - tilted dimension for installation		2820 (3320)¹	3195 (3695)¹	3650 (4125)¹
F - height of top edge of lower crosshead²		1010	1030	1020
G – max. test area height³		1450 (1950)¹	1750 (2250)¹	2000 (2500)¹
H – max. working test area height⁴		1372 (1872)¹	1659 (2159)¹	1900 (2400)¹
J – crosshead displacement range		1000 (1250)¹	1150 (1400)¹	1250 (1400)¹
Weight⁶		920 (970)¹	1520 (1600)¹	3600 (3720)¹

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

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_G100 – max. test frame height with 100mm stroke actuator	3175 (3675)¹	3259 (3759)¹	3523 (4023)¹	4045 (4545)¹	mm
A_G250 – max. test frame height with 250 mm stroke actuator	3475 (3975)¹	3559 (4059)¹	3823 (4323)¹	4345 (4845)¹	mm
A_G400 – max. test frame height with 400 mm stroke actuator	-	3859 (4359)¹	4123 (4623)¹	4635 (5135)¹
A – max. column height	2690 (3190)¹	2690 (3190)¹	2900 (3400)¹	3250 (3750)¹	mm
A_K – tilted dimension for erecting	2820 (3320)¹	2820 (3320)¹	3060 (3560)¹	3500 (3980)¹	mm
B – max. width of test frame	1079	1079	1197	1525	mm
C – max. depth of test frame	780 (1020)²	780 (1020)²	1130 (1130)³	1130 (1370)²	mm
D₁ – column spacing	565	565	670	800	mm
E – column diameter	80	80	100	120	mm
F – height of top edge of lower crosshead⁴	950	950	890	900	mm
G – max. height of test area⁵	1510 (2010)¹	1510 (2010)¹	1705 (2205)¹	2120 (2620)¹	mm
H – max. height of work test area⁶	1434 (1934)¹	1434 (1934)¹	1614 (2114)¹	2020 (2520)¹	mm
J – crosshead adjustment path	1000 (1250)¹	1000 (1250)¹	1150 (1400)¹	1250 (1400)¹	mm
Weight without T-slotted platform⁷	899 (945)¹	895 (941)¹	1361 (1430)¹	3660 (3780)¹	kg
Weight with T-slotted platform⁷	1137 (1182)¹	1133 (1178)¹	2082 (2232)¹	4860 (4980)¹	kg
Frame stiffness with crosshead separation 1000 mm⁸	730	730	988	1529	kN/mm
Frame stiffness with crosshead separation 1000 mm³	870	870	1332	1848	kN/mm
Item No.
Standard height	077533	924779	040159	079720
Standard height with T-slotted plate	077370	079752	040158	079728
Extra high + 500 mm	750972	077534	079755	079721
Extra high +500 mm with T-slotted platform	077535	079753	079756	079733

Variant with height increased by 500mm
Variant with t-slotted platform
Version with T-slotted platform
With vibration-damping feet
Distance between upper and lower crossheads
Distance between piston flange and upper crosshead with piston retracted
Weight without actuator, load cell, or any tools
Standard table plate

Test area height	Standard	Extended by 250 mm	Extended by 500 mm
Dynamic nominal force	25	25	25	kN
A – max. height of test frame	1325		1825	mm
A_G100 – max. test-frame height with 100mm-stroke actuator	1865		2365	mm
A_G250 – max. test-frame height with 250mm-stroke actuator	2165		2665	mm
B – max. width of test frame	660	660	660	mm
C – max. depth of test frame	450	450	450	mm
D1 – distance between columns	460	460	460	mm
E – column diameter	65	65	65	mm
F – height of top edge of lower crosshead	75	75	75	mm
G – max. test area height¹	1070		1570	mm
H – max. working test area height²	310 to 1010		810 to 1510	mm
J – crosshead adjustment path³	700		700	mm
K – weight⁴	300		330	kg
Frame stiffness at 1000mm crosshead separation	300	300	300	kN/mm
Clamping/ adjustment: manual/manual	1037238	1037238	1037469
Clamping/ adjustment: manual/hydraulic	1036930	1036931	1037473
A - max. height of test frame		1575
A_G100 – max. height of test frame with 100 mm stroke actuator		2115
A_G250 – max. height of test frame with 250 mm stroke actuator		2415
G – max. height of test area¹		1320
H – max. height of work test area⁵		560 ... 1260
J – crosshead adjustment path⁶		700
K – weight⁷		315
Clamping/Adjustment: manual/manual	1037462

Distance between upper and lower crossheads
Distance between piston flange and base crosshead with piston retracted
For frames with hydraulic adjustment only
Weight without actuator, load cell, or any fixtures
Distance between piston flange and lower crosshead with piston retracted
Only for frames with hydraulic adjustment
Weight without actuator, load cell, or any tools

Components and accessories

Hydraulic power pack 40 l/min without noise protection for servohydraulic load frames

Hydraulic power packs

Servohydraulic load frames require a hydraulic power pack for drive and control of the testing actuator. The ZwickRoell hydraulic power packs feature high operational reliability and long service life.

When designing the power packs, we focused on cost-effectiveness for our customers. The stand-alone power packs are used with systems with power control. Only as much hydraulic power is produced as is currently required by the testing systems.

Downloads

Testing actuator LH2500 for servohydraulic load frames

Servohydraulic testing actuator

ZwickRoell’s testing actuators are servohydraulic linear drives that convert hydraulic energy into a mechanical linear movement.

The 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.

Downloads

Distribution unit for servohydraulic load frames

Hydraulic distribution unit

The hydraulic distribution unit distributes the pressurized oil generated by the hydraulic power pack. 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

Controller

The testControl measurement and control electronics for servohydraulic testing machines supports the control of hydraulic linear or torsion actuators that are used in free-standing format or in a testing machine.

The controller allows the performance of static, quasi-static, oscillating and dynamic tests to be carried out on materials, parts, components and complete structures.

Maximum data accuracy thanks to the 24 bit resolution of the measurement signal over the entire measurement range.
Precision measurement and control through data acquisition and clock rate of 10 kHz.

Remote control

The ergonomic handheld remote control with display enables you to work efficiently and ergonomically. The entire test process, including setup and control of automatic extensometers and specimen grips, is run via the display-equipped remote control

Expanded temperature range

Tests in different temperature ranges are used to determine the effect of specific temperatures on material properties. For these tests, ZwickRoell offers various temperature chambers and high-temperature furnaces that guarantee the perfect solution for every application.

Special tests for the determination of low cycle fatigue (LCF tests) require test temperatures on the specimen up to 1,000 °C. The high-temperature furnace has three independently controllable temperature zones in order to achieve the most even temperature distribution possible on the specimen.

Additional accessories

The final element in our dynamic testing product portfolio is the manufacture of all the necessary accessories, including specimen grips and test tools. Our portfolio is constantly being expanded through a program of continuous development and inclusion of new products.

For more information on our accessories, please contact our experts.

testXpert R – our software for dynamic testing

testXpert R is used with servohydraulic testing machines, vibrophores and electrodynamic testing machines. The testing software offers the right test programs for fatigue tests, fracture mechanics, low cycle fatigue (LCF). A graphical block editor is available for free test configurations, where up to 100 blocks can be parameterized.

Learn more about the testXpert R testing software

Do you have questions about our dynamic products?

Please feel free to contact our experts. We will be happy to discuss your needs.

Other dynamic testing machines

Typical tests performed with servohydraulic load frames

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

Fracture mechanics: critical stress intensity factor K1C

ASTM E399

to Fracture mechanics: critical stress intensity factor K1C

Fracture mechanics: crack growth da/dN and threshold value

ASTM E647

to Fracture mechanics: crack growth da/dN and threshold value

Downloads

Product Information: HA series servohydraulic testing machine PDF 398 KB
- DE
- EN
Product Information: Hydraulic Distribution Unit PDF 396 KB
- DE
- EN
Product Information: HB series servohydraulic testing machine PDF 378 KB
- DE
- EN
Product Information: HC series servohydraulic testing machine PDF 293 KB
- DE
- EN
Product Information: Hydrostatic single testing actuator 10-50 kN PDF 540 KB
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- EN
Product Information: Hydrostatic single testing actuator 100-1000 kN PDF 480 KB
- DE
- EN
Product Information: 20 l/min. hydraulic power pack PDF 567 KB
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Product Information: 40 l/min. hydraulic power pack PDF 567 KB
- DE
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Product Information: 80 l/min. hydraulic power pack PDF 598 KB
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Product Information: 170 l/min. hydraulic power pack PDF 391 KB
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Product Brochure: Dynamic and Fatigue Testing Systems PDF 5 MB
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- EN