By Sotirios J. Vahaviolos
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Additional resources for Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353)
Magnetic clamps were also used to hold the sensors in place. The ambient temperature was approximately 30 ~ F (-1 ~ C) and there was some difficulty in getting the glue gun to heat to the proper level so that the glue could be applied in a sufficiently viscous state to allow the couplant to be squeezed to a thin layer under the sensor. It is anticipated that in future testing the magnetic clamps will be used to keep the sensors in place and a more viscous couplant will be used. HAMILTON ET AL. ON FATIGUE IN TRAFFIC SIGNAL POLES Load Application Applied Moment Load was applied to the end of the mast arm using a fabric cable and a winch.
T . ". ~ DEFORM E D:BAR : [ . . . . ;. ~.... :-. -;. l-Configuration o f the specimen with a single reinforcing bar. J 1500- kl_l 1V rn 1000z v 500- - ! 2-Relationship between number o f AE hits and the applied load. 12 mm. The breakdown of the effect becomes clearer as the cracking progresses in the third, fourth and fifth loadings. High AE activities are observed during the third, fourth and fifth unloadings. The moment tensor analysis revealed that the contribution of shear cracks increases as the breakdown of the Kaiser effect becomes clearer with the progress of the fracture.
There are a great number of studies, reports and other publications devoted to development of NDT for concrete and concrete structures [2-4], but only a few test methods are standardized . This factor has a negative impact on usage of NDT for concrete technology now and will have a place in the future. Concrete and concrete structures still remain "orphaned children" of the NDT standards family. For example, acoustic emission (AE) standards well developed for other materials are out of sight for concrete and concrete structures testing: ANSI/ASTM Practice for Acoustic Emission Monitoring of Structures During Controlled Simulation (E0569), ANSI/ASTM Guide for Mounting Piezoelectric Acoustic Emission Sensors (E0650), ANSI/ASTM Practice for Acoustic Emission Monitoring During Continuous Welding (E0749), ANS1/ASTM Practice for Characterizing Acoustic Emission Instrumentation (E0750), ANSI/ASTM Practice for Acoustic Emission Examination of Fiberglass Reinforced Plastic Resin (FRP) Tanks/Vessels (El 067) and others.
Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353) by Sotirios J. Vahaviolos