Launched by Cepel in 1975, the Laboratory of Mechanics and Structural Dynamics (MA4), formerly referred to as Mechanical Properties Laboratory, supports research on mechanical aspects of generation, transmission and distribution systems of paramount interest to the electricity sector and also provides services to other industrial sectors. It is prepared to act both, internally, within its own facilities, and in the field, performing measurements in clients' facilities.
The Laboratory of Mechanics and Structural Dynamics has at its disposal an area to perform vibration tests (harmonic, transient and shock) of equipments up to 1,000 kg and two indoor spans with 60 m and 75 m length, both in environments with stable and controllable temperature. Both spans allow one to apply long-term mechanical loads as well as to simulate wind-induced vibrations and they are used to perform both static and vibration tests on transmission line cables and other related accessories (dynamic vibration absorbers, end fitxtures, insulators). The laboratory is also equipped with two universal tensile test machines with load capacity of 300 kN and one thermomechanical fatigue test machine with load capacity of 100 kN to perform tensile, compressive, bending and fatigue tests on either standard testpieces or on non-standard geometries in order to evaluate the static and fatigue strengths of materials either at room temperature or above.
Some of the major products developed by the laboratory are prototypes and researches for service life assessment and predictive techniques for equipment maintenance through the monitoring of mechanical quantities.
The laboratory also offers resources for the development of projects within the research themes "Monitoring of Electrical and Mechanical Performance of Transmission Lines", "New Transmission Line Concepts" and "Optimization of Transmission Line Projects".
• tensile/compressive/bending and impact tests on metallic, polymeric and ceramic materials (300 kN max.)
• creep tests in transmission line cables
• rupture tests in transmission line cables and glass, ceramic and polymeric insulators (300 kN max.)
• vibration tests in mechanical, electric and electronic components
• vibration tests in transmission line cables, dynamic vibration absorbers and other accessories
• analysis of data collected by vibrometers placed on transmission line cables
• thermomechanical fatigue tests
For the conduction of its activities, the Laboratory of Mechanics and Structural Dynamics has at its disposal:
- an area for vibration tests on large-scale equipments/components up to 1000 kg in three mutually-perpendicular directions, performed with a high-capacity electrodynamic shaker equipped with a vertical and an horizontal vibration tables;
- two indoor spans with 60m and 75m length with stable and controllable temperature to perform static and vibration tests on transmission line cables, dynamic vibration absorbers and other accessories;
- a wide variety of sensors and instrumentation for measurement, conditioning and post-processing of mechanical quantities (temperature, displacement, velocity, acceleration, force, strain, stress);
- two universal tensile testing machines with load capacity of 300 kN with both displacement and force controlled modes of operation to perform tensile, compressive and bending tests either on standard testpieces or on non-standard geometries (cables, insulators) in order to evaluate the static strength of metallic, ceramic and polymeric materials;
- a thermomechanical fatigue testing machine with load capacity of 100 kN equipped with an inductive heating system, an air-cooled system and displacement, force or strain controlled modes of operation to perform either isothermal fatigue tests or thermomechanical fatigue tests on standard metallic testpieces. Arbitrarily general mechanical and thermal cycles (in-phase or out-of-phase cycles with dwell time) may be easily constructed via embedded software.
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