Abstract
Ultrasonic fatigue tests were carried out on the plastic material Nylon 6. Special attention was devoted to the temperature control in order to avoid physic-chemical transformation of this low melting point material. Under ultrasonic fatigue tests, important heat dissipation takes place at the narrow section of hourglass shape specimen leading to high temperature at this zone. The specimen was calculated to meet the resonance condition with the smallest dimensions at its narrow section, with aim to reduce the temperature gradient at this zone of this non heat conducting material. Temperature at narrow section was maintained lower than 45℃ using a cooling system with cooling air; under this condi- tion the ultrasonic fatigue tests were performed. Experimental tests were carried out at low loading range (9 - 12.5% of the elastic limit of material) in order to control the highest temperature and to avoid that specimen was out of resonance condition. Experimental results are analyzed together with the fracture surfaces and conclusions are presented concerning the ultrasonic fatigue endurance of this polymeric material.
Highlights
Industrial applications of plastic materials have been increasing exponentially in the last 30 years: Semiconductor manufacturing, Medical sector, Food processing, Electrical power and electronics, Oil drilling and exploration, Oil refinery and transportation, Underwater seismology, Automotive, Aerospace and flight, Chemical manufacturing, Logging and forestry, Water and waste treatment, Materials handling 1-3
In most of its industrial application, this plastic material undergo oscillating mechanical loading that leads to fatigue condition 8 ; it is of principal interest to investigate the fatigue endurance of this material in the high and very high cycle regime
Crack propagation was observed at the narrow section of specimen in a perpendicular plane to the specimen longitudinal direction; crack origin was not clearly indentified: in some fracture surface it seems to be localized inside the specimen, associated with the high temperature at this zone
Summary
Industrial applications of plastic materials have been increasing exponentially in the last 30 years: Semiconductor manufacturing, Medical sector, Food processing, Electrical power and electronics, Oil drilling and exploration, Oil refinery and transportation, Underwater seismology, Automotive, Aerospace and flight, Chemical manufacturing, Logging and forestry, Water and waste treatment, Materials handling 1-3. Nylon polyamides can withstand sustained contact with a wide variety of chemicals, alkalis, dilute acids or oxidizing agents Another important factor, both economically and mechanically, is the relative light weight of polyamide—approximately 1/8 the weight of bronze, 1/7 the weight of cast iron, and 1/2 the weight of aluminum—which reduces both the inertial and static loads and eases the handling of large components during maintenance or replacement procedures. Both economically and mechanically, is the relative light weight of polyamide—approximately 1/8 the weight of bronze, 1/7 the weight of cast iron, and 1/2 the weight of aluminum—which reduces both the inertial and static loads and eases the handling of large components during maintenance or replacement procedures Industrial applications of this plastic material, among others, include: food contact parts, wheels, gears, custom parts, textile fibers, electric parts, industrial cords, carpets, bushings, ropes, slippers, pulleys, etc. In most of its industrial application, this plastic material undergo oscillating mechanical loading that leads to fatigue condition 8 ; it is of principal interest to investigate the fatigue endurance of this material in the high and very high cycle regime
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