ZHU/zwickiLine

Universal hardness tester for instrumented indentation tests

The ZHU/zwickiLine universal hardness testing machine is based around the zwickiLine materials testing machine. It can be used both for classical hardness testing methods (Rockwell, Vickers, Brinell, ball-indentation) and for the innovative instrumented indentation method for determining hardness plus other material parameters of metallic materials (Martens hardness, ISO 14577). In addition, cyclic indentation tests with increasing test load or indentation depth and partial unloading are implemented in the testXpert testing software.
ZHU/zwickiLine for instrumented indention testing
Hardness measurement head for ZHU/zwickiLine
  • Instrumented indentation test
  • Optical hardness testing methods (Vickers, Brinell, Knoop)
  • Depth measurement methods (Rockwell and similar)

The ZHU/Z2.5 is the most flexible, most versatile hardness testing machine in the world.

Dr Erhard Reimann

An Overview of the Essentials

Advantages and features of ZHU/zwickiLine

  • User-friendly one-button operation.
  • Universal, material-dependent application for practically all hardness testing methods featuring indentation depth measurement.
  • Fast, automatic approach, including with different specimen heights.
  • Fully automatic test sequence and evaluation.
  • Shortest possible test times.
  • Minimal resetting when changing between methods or changing indenter and sensor foot.
  • High measured-value resolution and consistent testing conditions deliver high measured-value accuracy and reproducibility.
  • Determination of additional material characteristics from the force-indentation depth curve.
  • Versatile results display: individual and statistical values, graphs, screen display and printouts can generally be changed freely.
  • Multiple curve for direct comparison of tests in a series.
  • Configuration of user-specific test sequences: special test sequences can also be defined and performed easily.
  • Can be used for in-production tests.

Applications

The ZHU2.5/Z2.5 and ZHU0.2/Z2.5 universal hardness testing systems each comprise a Zwick hardness testing system, a hardness measuring head and testXpert testing software.

Zwick hardness testing systems consist of zwicki single-column load frames with additional gearbox modification (crosshead speed vmax ≤ 50 mm/min) for maximum control accuracy in the submicron range. The ZHU/zwickiLine is available with two different test areas; 350 mm or 850 mm.

Incorporated into the hardness measuring head are a digital displacement measurement system (resolution 0.02 µm), a load cell (range 5 N to 2500 N or 2 to 200 N) and an interchangeable indenter with sensor foot.

Depending on the range of application, the head is designed for use with all Zwick materials testing machines and is also suitable for automated applications.

  • Overall the hardness measuring head covers all hardness tests employing indentation measurement, including:
  • Martens hardness HM, instrumented indentation test
  • Rockwell hardness scales A to K, N, T, plus HMR5/250
  • Rockwell hardness scales R, L, M, E, K, α
  • ball indentation hardness (for plastics)
  • Vickers depth measurement HVT
  • Brinell depth measurement HBT

Instrumented hardness testing for determination of the Martens hardness HM of metals is standardized in EN ISO 14577-1. The purpose of this standard is to define a universal hardness scale. This scale covers all hardness grades from thermoplastic films to very hard metals, enabling improved comparability of material behavior.

  • The force-indentation depth curve and different sequences of the loading process allow more comprehensive description of mechanical material properties, including:
  • plastic and elastic portions of the indentation energy
  • Martens hardness HM
  • volume hardness HMs
  • indentation hardness HiT
  • elastic indentation modulus Eir
  • creep behavior
  • creep relaxation behavior

With regard to the designation "ZHU2.5/Z2.5", the numbers before the slash refer to the maximum test load in kN; the numbers after indicate which Zwick hardness testing machine is used.

Features of the optical testing unit

  • Flexible adaptation of test parameters, e.g. approach speed, loading and unloading rates.
  • Ability to test HM and HV with one indentation.
  • Test load-indentation depth curve can be displayed and evaluated with all test methods.
  • Optical monitoring of specimen surface.
  • Traverse tests can be freely defined and imported and exported. This applies to all methods.
  • Any desired hardness traverse tests can be performed in addition to Vickers traverse tests.
  • These features apply when optical hardness test methods are used.

Optics technical data 

"Optics" add-on unit for hardness measuring head

Description

Item number

"Optics" add-on unit in conjunction with hardness measuring head (testControl), including manual displacement unit for installation in a materials testing machine. Includes 1.4-megapixel GigE camera, LED illumination and software licenses.

320623

Required:

objective lenses

see below

power supply unit for LED illumination

375922

powerful graphics card for optical hardness test methods

075270

"Optics" add-on unit in conjunction with hardness measuring head (testControl), including motorized displacement unit for installation in a materials testing machine. Includes 1.4-megapixel GigE camera, LED illumination and software licenses.

022243

Required:

objective lenses

see below

power supply unit for LED illumination

375922

powerful graphics card for optical hardness test methods

075270

motorized X-Y table

see above

Video adapter (interchangeable; option for "Optics" add-on unit) with low individual magnification for connecting the GigE camera to hardness measuring microscopes. The field of view shown on the screen is expanded by a factor of approximately 2.

320406

Video of ZHU/zwickiLine in Action

1:38

ZHU/zwickiLine universal hardness tester

The ZHU/Z2.5 is the most flexible, most versatile hardness testing machine in the world. Its hardness measurement head is integrated in the zwickiLine testing machine.

Technical Overview

Measuring head up to 2.5 kN

Description

Value

Item No.

320196

Resolution

0.02

μm

Test load, max. (Fmax)

2.5

kN

Upper connection

Ø 20

mm

Lower compression platen

Ø 138

mm

Load cell

0.005 to 2.5

kN

Extensometer, digital

max. 4 mm, increased resolution 0.02 μm

Measuring head up to 200 N

Description

Value

Item No.

320198

Resolution

0.02

μm

Test load, max. (Fmax)

0.2

kN

Upper connection

Ø 20

mm

Lower compression platen

Ø 138

mm

Load cell

0.002 to 0.2

kN

Extensometer, digital

max. 4 mm, increased resolution 0.02 μm

Optical unit

  • User-friendly one-button operation.
  • Universal, material-dependent application for practically all hardness testing methods featuring indentation depth measurement.
  • Fast, automatic approach, including with different specimen heights.
  • Fully automatic test sequence and evaluation.
  • Shortest possible test times.
  • Minimal resetting when changing between methods or changing indenter and sensor foot.
  • High measured-value resolution and consistent testing conditions deliver high measured-value accuracy and reproducibility.
  • Determination of additional material characteristics from the force-indentation depth curve.
  • Versatile results display: individual and statistical values, graphs, screen display and printouts can generally be changed freely.
  • Multiple curve for direct comparison of tests in a series.
  • Configuration of user-specific test sequences: special test sequences can also be defined and performed easily.
  • Can be used for in-production tests.
  • User-friendly one-button operation.
  • Universal, material-dependent application for practically all hardness testing methods featuring indentation depth measurement.
  • Fast, automatic approach, including with different specimen heights.
  • Fully automatic test sequence and evaluation.
  • Shortest possible test times.
  • Minimal resetting when changing between methods or changing indenter and sensor foot.
  • High measured-value resolution and consistent testing conditions deliver high measured-value accuracy and reproducibility.
  • Determination of additional material characteristics from the force-indentation depth curve.
  • Versatile results display: individual and statistical values, graphs, screen display and printouts can generally be changed freely.
  • Multiple curve for direct comparison of tests in a series.
  • Configuration of user-specific test sequences: special test sequences can also be defined and performed easily.
  • Can be used for in-production tests.
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