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Tensile, Compression & Flexural

Electro-mechanical machines often are the perfect solution for typical applications including testing of metal specimens, fasteners, composites, cables, forgings, welded joints, geotextiles, polymers and reinforced plastics, civil structure materials, adhesives, components or finished goods.

The machines with its pre-loaded, backlash-free ball screws and heavy duty bearings with additional robust guidance columns features accurate crosshead alignment and are suitable not only for tension, compression or flexural test but also through zero testing.

The backlash-free ball screws are digital controlled by a high responsive AC brush-less servomotor with high start up torque for faster starts and stops and best and most accurate control over a large speed range at a extremely low noise level. These load frames are rigid 1,2 and 4-column constructions, providing superior axial and lateral stiffness. The machine is equipped with multi-position limit detectors for the best protection of operator, test sample and machine.

The load frame is constructed in the way that the upper crosshead is driven so that the lower base platen remains and allows an ergonomic working in seated or standing position at pleasant working height. The lower base platen is also available with T-slots suitable to fix components, specimens, manufactured assemblies or other accessories. Optional are 2nd and 3rd test chambers and operators safety protection when brittle materials are tested.

Low Cycle Fatigue

walter + Bai Series LFMZ of testing machines is the prefect solution for creep, relaxation or LCF testing. Special software packages for data acquisition of single or multiple machines with force, elongation, temperature and time registration with graph fulfil the requirements of modern testing laboratories.

The Series LFMZ of testing machines feature a special torsion and backlash-free pre-stressed central ball screw drive by a brush-less-free AC servomotor. The machine also allows long term tests with only small deformations and is therefore mostly used to perform creep fatigue (constant applied load), relaxation (constant elongation) or LCF (low cycle fatigue) test under certain temperature conditions with high temperature furnace.

Compared with dead weight or spring loaded systems the Series LFMZ testing machines are fully programmable and offer closed loop force, deformation or crosshead control with testing speeds as low as 0.5 micron / hour. These testing machines can be also used for tensile, compression or 3- / 4-point bending tests for example on ceramic specimens or with built in environmental chambers.

Electro-Dynamic Fatigue

walter + bai Series LFV-E are fluid-free non-hydraulic systems currently available with force capacities up to 2.5 kN for fatigue and durability testing, tensile, compression, bend, peel or shear  strength testing as well as crack initiation.

These table top systems with its SerovElectric drive mounted on upper crosshead represents a versatile and reliable fatigue rated testing machines combined with latest drive technology.

These machines are selected from testing professionals in quality control, R&D or Universities who desire a compact space saving, clean and quite low force testing unit that requires no environmental consideration and virtually no maintenance.

The ServoElectric drive with its in-line digital displacement transducer provides noise-free stroke measurement or control. This drive features backlash-free motion with no fluid compressibility to compromise position accuracy.

The system is available with integral T-slot platen providing high degree of flexibility or attachable (to the upper crosshead) closed frame often used from those who test e.g. dental implants in combination with saline bath.

The upper crosshead can be lift or lowered through integrated electrical spindles to adjust the desired test space. Only unclamp the crosshead by twisting the lever clamps and pushing the up / down bottom without any tools.

High Cycle Fatigue

RUMUL Resonant testing machines stress specimens or components with a dynamic load superimposed to a static load. The machines are equipped with a digital controller for each kind of load.

The dynamic load is generated by an oscillating system (resonator) which runs in its natural frequency. The oscillating system consists of masses and springs whereas the test piece is also an important part of it. The masses can be varied to change the operating frequency in steps.

The static load is made by a spindle and is coupled to the system by a spring. The machines discussed here are operating at full resonance, that means the operating point is on the peak of the resonant curve.

The resonantor is excited by an electromagnet which has to supply the energy to maintain the required load amplitude.

Due to the resonant effect the power consumption is very low (typical 20 to 1000 Watts), that means 3% to 10% in comparison to a servo-hydraulic testing machine. The operating frequency is in a range of 40 to 300 Hz on standard machines