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WMT&R Ltd have the capability to
conduct fatigue testing
on a range of materials with machine capabilities encompassing forces from
as little as 50N to a maximum of 1MN. Our servo-hydraulic test frames can be
operated in load, strain or position control. The laboratory works with a range
of materials at both ambient and elevated temperatures to 1000oC.
Test techniques include standard high and low cycle axial fatigue, staircase
fatigue, F.C.G.R, and also component testing using loads from 50N to 1MN. A full
range of grips and fixtures are available to accommodate sample geometries and
components. We have the flexibility and
resources to accommodate a wide range of sample types and sizes. Data is
collected electronically using state-of-the-art software enabling post
processing by ourselves or our clients (if required).
 Fatigue Testing to:
ASTM E606, BS7270, ASTM E561, ASTM E647, ASTM E399, BS3518-3, and
Documented In-House method for Fatigue Testing of Welded, Adhesive Bonded and
Mechanical Joints, primarily in sheet materials.
Fatigue Testing Services:
High Cycle Fatigue, Low Cycle Fatigue, Da/DN, Delta K, Rotating Beam,
Fasteners, Customized testing on full size components and parts.
WMT&R Ltd
specialise in low cycle fatigue
testing on thin sheet material. The strain life of Aluminum alloys
presented as 1.5mm thick test pieces has been successfully measured in a fully
reversed fashion up to 1%. This is a technically demanding test where any degree
of bending in the sample will invalidate the test results. To avoid this
potential problem, all test machines are fitted with alignment cells which are
diligently set as part of the quality procedure to ensure that the grips are
perfectly aligned prior to, and hence during, testing.
Low cycle fatigue testing is generally run in strain control
with the load being a dependent variable. Test frames can be utilised to subject
the specimen to a specified wave type (sinusoidal, triangular, trapezoidal, or a
custom form). Additional variables are frequency (and hold), mean strain, strain
amplitude, and discontinue cycles.
WMT&R’s customised post test analysis software can be utilised to determine
crack initiation, propagation life, and failure, failure is usually
determined by a percentage load drop from a stable position. Typical data from
these tests will include load peaks, strain peaks, hysteresis loops at specific
intervals, calculated plastic and elastic strain, first cycle information and
half-life cycle loop information.
Forces from 50N to 1MN
Sample thicknesses routinely from 2mm
Metals, composites
 Materials,
welded joints, adhesively bonded joints and mechanically fastened joints
Typical Standards are ASTM E606, BS7270, prEN3874
High cycle fatigue testing may be conducted on materials or
joints.
Tests are conducted under load control to produce an S-N
curve, a plot of load versus cycles to failure. The minimum load applied
will allow the test sample to survive exposure to 10's of millions of
cycles.
Joints of various constructions can be evaluated.
These include welded joints, adhesively bonded joints, riv-bonded and
mechanically fastened joints.
Typically these are performed in accordance
with our own, in-house accredited procedures WMTR/QTP/EM001, WMTR/QTP/F001.
Our parent company
in the USA,
WMT&R, Inc., also
offers extensive
Fatigue
Testing Services to meet your needs.
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