Servohydraulic Testing Machine HB from 50 to 2500 kN

Actuator in the Upper Crosshead

Standard versions of the HB load frame in the 50 to 2,500kN 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.

Servohydraulische Prüfmaschine HB-Baureihe für dynamische Prüfungen

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Servohydraulic Components
Common Tests
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News

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Technical Overview

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.

Description

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 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_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 250mm-stroke actuator	3475 (3975)^[1]	3559 (4059)^[1]	3823 (4323)^[1]	4345 (4845)^[1]	mm
A_G400 – max. test-frame height with 400mm-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 installation	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)^[2]	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 crosshead^[3]	950	950	890	900	mm
G – max. test area height^[4]	1510 (2010)^[1]	1510 (2010)^[1]	1705 (2205)^[1]	2120 (2620)^[1]	mm
H – max. working test area height^[5]	1434 (1934)^[1]	1434 (1934)^[1]	1614 (2114)^[1]	2020 (2520)^[1]	mm
J - crosshead displacement range	1000 (1250)^[1]	1000 (1250)^[1]	1150 (1400)^[1]	1250 (1400)^[1]	mm
Weight without T-slotted platform^[6]	899 (945)^[1]	895 (941)^[1]	1361 (1430)^[1]	3660 (3780)^[1]	kg
Weight with T-slotted platform^[6]	1137 (1182)^[1]	1133 (1178)^[1]	2082 (2232)^[1]	4860 (4980)^[1]	kg
Frame stiffness with crosshead separation 1000 mm^[7]	730	730	988	1529	kN/mm
Frame stiffness with crosshead separation 1000 mm^[2]	870	870	1332	1848	kN/mm
Item No.
Standard height	077533	924779	040159	079720
Standard height with T-slotted platform	077370	079752	040158	079728
Extra-high + 500 mm	750972	077534	079755	079721
Extra-high + 500 mm with T-slotted platform	077535	079753	079756	079733
Number of columns				2
Frame stiffness at 1000-mm test area height				2100
Top crosshead adjustment				Hydraulic
Top crosshead clamping				Hydraulic
Finish				RAL 7011 and RAL 7038
Weight with typical accessories, approx.				4700
Area required for installation:
Actual footprint				962.11
Test frame base area				1.7755
Specific floor loading (weight / actual footprint):
Based on typical accessories				479.06
With 50 % safety				718.6
Floor load (weight / Space requirements):
Based on typical accessories				370.462
At specimen break (3x), max.				1111.4

Variant with height increased by 500mm

Variant 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 and any fixtures

Standard table plate

Layout

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

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

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.

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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: