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Metal and Weld Fatigue Tester

IP.com Disclosure Number: IPCOM000078197D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Paine, RH: AUTHOR

Abstract

The present tester provides a gradually increasing deflection of the material or part under test. A force is applied to the backstop of a type carrier 10, deflecting it at the rate of 5 cycles per second. The displacement of the backstop is gradually increased with each cycle and the test is continued until the backstop weld cracks. The force applied gradually increases as the deflection increases and as soon as the weld begins to crack, the applied force begins to drop. Thus, if the force is monitored by a recording instrument, the force at which the weld fails is easily determined.

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Metal and Weld Fatigue Tester

The present tester provides a gradually increasing deflection of the material or part under test. A force is applied to the backstop of a type carrier 10, deflecting it at the rate of 5 cycles per second. The displacement of the backstop is gradually increased with each cycle and the test is continued until the backstop weld cracks. The force applied gradually increases as the deflection increases and as soon as the weld begins to crack, the applied force begins to drop. Thus, if the force is monitored by a recording instrument, the force at which the weld fails is easily determined.

The method of obtaining a continuously increasing displacement is to pass the type carrier slowly across the angular face of a push bar 11 by rigidly mounting the type carrier on a crossfeed slide 12, which is driven by a very slow- speed motor 13. The push bar is driven back and forth by a double acting air cylinder 14 at the rate of 5 cycles per second. To obtain the driving rate of the air cylinder, a 5 cycles per second sine-wave generator 15 is provided which drives a mercury-wetted relay 16 having multiple sets of contacts. A 48 volt DC four- way solenoid air valve 17 is connected to one set of contacts, and a counter 18 is connected to a second set of contacts so that each time the relay operates, a count is made. The air line to the cylinder is equipped with an air line filter 19, a pressure reducer 20, air gauge 21, and an air line oiler 22.

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