Dissipation measurement aids stress testing
A
Cedip Infrared Systems product story
Edited by the Engineeringtalk editorial team
Oct 7, 2003
Following several years of development and intensive testing work, Cedip Infrared Systems has added a novel dissipation measurement mode to its Altair LI infra-red camera system.
Following several years of development and intensive testing work in partnership with two major automotive manufacturers, Cedip Infrared Systems has added a novel dissipation measurement mode (or D-mode) to its Altair LI infra-red camera system.
The new capability allows engineers to determine the damage induced by fatigue loading on mechanical structures.
As part of Cedip's Altair LI package, the D-mode technique can be used to quickly assess the fatigue limit of most materials.
Only a limited number of samples are required to obtain an accurate determination of the fatigue limit.
Also the technique is capable of working on real structures operating in real conditions as opposed to the usage of large number of test specimens commonly required by conventional methods.
One successful implementation of the D-mode technique has been the installation of an Altair LI system onto an automotive production line to determine the quality level of iron crankshaft being produced.
The samples are taken randomly and measured automatically with the Altair LI test station, the D-mode signal is plotted against the applied load to the sample.
The resulting test curve shows a linear increase of the D-mode signal up to the fatigue limit and after reaching this limit a rapid increase.
The break-up point of the curve corresponds to the fatigue limit.
As a result of this technological breakthrough the manufacturer of these crankshafts now relies on the D-mode technique to fully assess the quality of its production.
Any discrepancies in crankshaft material performance can be rapidly detected offering the potential benefits of increased operational reliability and lower incidence of component breakdown in operation.
The Altair LI is an advanced system that uses Cedip Infrared Systems' advanced Jade infrared focal plane array camera technology.
It is capable of producing noncontact stress images of structures and materials under cyclic loading.
Using measurements based on the thermoelasticity principle together with a highly sensitive infra-red focal plane array camera and state of the art digital processing electronics the Altair LI offers leading edge performance.
When a structure undergoes cyclic loading as during fatigue testing, small temperature changes are produced at the material surface.
These temperature changes vary synchronously with loading.
Under adiabatic condition, there is a linear relationship between temperature variation and local stresses.
The required thermal resolution to achieve a resolution of 1MPa depends on the material properties through the Km constant, it is typically equal to 1mK for steel and 2mK for aluminium.
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