AE Testing Lab Report
Various researchers had worked in the field of AE testing. A brief review of the work carried out in this area is explained in this section.
Ohtsu et. al [1994] studied the history and development of AE. According to them AE research was first carried out in 1950 by J. Kaiser when he worked on metals. B.H Scofield in 1954, initiated the use of AE terminology wise in USA. T.F Drouillard found that first report on an experiment carried out with the help of AE was published in Japan. At the time of fracture the stored strain energy is released. Some of the energy is released in form of stress waves and these are known as acoustic emission. AE signals are amplified by pre-amplifier and main amplifier respectively. Elastic vibrations of 10-9 mm …show more content…
al [2006] studied emissions generated from wire ropes during proof load and fatigue testing. The specimens were made from 10mm steel wire ropes of a configuration of 6x36(14/7+7/7/1) Inner Wire Rope Core. This configuration consist of a central king wire and other wires are wounded around it in helical form. The rope has a breaking load of 72.9kN, a proof load of 25.5kN and a safe working load of 12.75kN. Different damage was introduced in the wire with the help of saw. The acoustic transducers having sampling rate of 4 MHz and frequency band pass of 100 kHz-1.2 MHz (set by software). The acoustic emission signals having five or more than five counts were accepted. In the initial stage proof load was applied several times on the undamaged rope and after that safe working load was applied three times. After that again proof load was applied. The damage was created then with the help of saw and safe working load was applied three times followed by final proof load. Threshold was taken as 40 dB. The qualitative and quantitative nature of the signals were explored and it was found that signals classify the condition of ropes while it is under periodic proof loading. So it is not necessary always to install acoustic setup on ropes. It was also found that signals above 80 dB can differentiate between signals relating to damage and non-damage
Ohtsu et. al [1994] studied the history and development of AE. According to them AE research was first carried out in 1950 by J. Kaiser when he worked on metals. B.H Scofield in 1954, initiated the use of AE terminology wise in USA. T.F Drouillard found that first report on an experiment carried out with the help of AE was published in Japan. At the time of fracture the stored strain energy is released. Some of the energy is released in form of stress waves and these are known as acoustic emission. AE signals are amplified by pre-amplifier and main amplifier respectively. Elastic vibrations of 10-9 mm …show more content…
al [2006] studied emissions generated from wire ropes during proof load and fatigue testing. The specimens were made from 10mm steel wire ropes of a configuration of 6x36(14/7+7/7/1) Inner Wire Rope Core. This configuration consist of a central king wire and other wires are wounded around it in helical form. The rope has a breaking load of 72.9kN, a proof load of 25.5kN and a safe working load of 12.75kN. Different damage was introduced in the wire with the help of saw. The acoustic transducers having sampling rate of 4 MHz and frequency band pass of 100 kHz-1.2 MHz (set by software). The acoustic emission signals having five or more than five counts were accepted. In the initial stage proof load was applied several times on the undamaged rope and after that safe working load was applied three times. After that again proof load was applied. The damage was created then with the help of saw and safe working load was applied three times followed by final proof load. Threshold was taken as 40 dB. The qualitative and quantitative nature of the signals were explored and it was found that signals classify the condition of ropes while it is under periodic proof loading. So it is not necessary always to install acoustic setup on ropes. It was also found that signals above 80 dB can differentiate between signals relating to damage and non-damage