Induction Heating Steel Dogbone Specimen
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Objective: To heat a magnetic steel dogbone specimen to 12000F as quickly as possible and sustained for tensile testing. Heating should take place using a helical coil placed square in relation to the long axis of the gage area. Also, thermal and mechanical loading need to be controlled through the use of a temperature sensor output.
Material: 1008 Steel Dogbone Test Specimen measuring 4 3/4″ long, 11/16″ in diameter at the ends, and 0.406″ in diameter in the middle of the gage section.
Temperature: 12000F
Application: The UIHM Laboratory Staff chose to use the Power of 15KW,15KW output solid state induction power supply along with a seven (7) turn helical coil, a Mirage Infrared Thermometer, and a 4-20 mA input device for enhanced voltage ramp to achieve the following results:
# 12000F was reached throughout the gage area in 6.1 seconds.
# Temperature was sustained using the closed loop system provided by the Mirage Infrared Thermometer.
# Even and uniform heating was achieved through the use of the seven (7) turn helical coil.
Equipment: Power of 15KW,15kW output solid state induction power supply including one (1) remote heat station containing two (2) capacitors totaling 0.66 µF, a seven (7) turn helical coil with a 1 1/4″ ID and measuring 1 1/2″ OAL, a 4-20 mA output device to facilitate voltage ramping, and an optical thermometer.
Frequency: 231 kHz
Heating Dogbone Specimen
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