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Extra info for Acoustic Emission: Standards and Technology Update (ASTM Special Technical Publication, 1353)
The following settings were used: 1. 2. 3. 4. 5. Threshold: 40 dB Sample Rate: 2 MHz Peak Definition Time: 200 ~ts Hit Definition Time: 400 ~ts Hit Lockout (rearm) Time: 2 ~s Sensors were attached to the pole at each Of the four comers of the box connection (FIG. 6) and were attached with hot melt glue. 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.
The AE signals are registered during a certain period o f time AT after these actions. This approach allows the development of a criterion similar to output action as a convolution function, where multiplication o f count velocity N of AE to period o f time AT after the SL action is the core of this function. Analysis of Stress Using NN-Criterion The AE response to small loads for different relative levels o f stress can be analyzed using NN -criterion (Nogin-Nesvijski criterion) . Values o f NN -criterion are calculated for different relative levels o f stress~(t)/R, where R is the strength o f the concrete specimen.
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. As noted previously, the load cell was installed in line with the cable to allow recording of the load history along with AE data. As an added check, the tip displacements were monitored to ensure FIG.