Over time, repetitive movements can damage equipment.
When a part is subjected to repeated stresses, it may fail even if the stress has never exceeded its stress limit value (found when the part is subjected to static mechanical stress).
Indeed, at each cycle, the part suffers a micro-damage, and it is the accumulation of these damages that causes the breakage after ten thousand, one hundred thousand, one million cycles. We talk about fatigue failure (cf. wikipedia)
Endurance tests can be combined with climatic constraints.
The Emitech Group has developed mechanical test facilities to carry out either static tests until failure or endurance tests on a very large number of cycles.
For example, our subsidiary Environne'Tech has hydraulic cylinders of up to 500,000 N and control means for operating up to 6 cylinders simultaneously on the same structure.
For tests with lower forces, the same centre uses 6-axis robots.
The laboratory conducts tests until failure on structures of all sizes with loads up to 500,000 N.
The structure can be instrumented with stress gauges, displacement sensors or force transducers.
Example: static deformation under load of refrigerated trailers, breakage under maximum torque of transmission shafts of military vehicles, crash simulation on a bodywork component...
The laboratory carries out endurance tests on structures that can be instrumented in stress, force or displacement.
Up to 6 actuators can be combined on the same structure.
Example: endurance of automobile rims, endurance of automobile bodies with loads on wheels, fatigue endurance on fuselage elements...
Rolling tests - pitch - yaw
Swell movements can cause significant damage to a ship's equipment.
The laboratory has a bench composed of several hydraulic actuators controlled simultaneously to reproduce these movements.
The Group is equipped with 2 STAUBLI robots tofor operationnal endurance testing.
These robots can work in temperature either from the outside of a climatic enclosure or by being placed in a 93m3 climatic enclosure.
Some examples: opening/closing hoods and doors, operational endurance of all components on instrument panels, engine displacement tests on pipework, functional testing (keypad, battery insert, SIM card insert, charger insert etc.) for mobile telephones, usage endurance of hand pumps etc.