KHAIRUL AFINAWATI HASHIM

UiTM, Civil Engineering, Faculty Member

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Papers by KHAIRUL AFINAWATI HASHIM

Determination of Acoustic Emissions Data Characteristics under the Response of Pencil Lead Fracture Procedure

Journal of Failure Analysis and Prevention, 2021

This paper presents the results of the analysis of acoustic emission signals (AE) recorded during... more This paper presents the results of the analysis of acoustic emission signals (AE) recorded during the propagation of sound waves in rock samples. The sources are excited by breaking a 3-mm-thick pencil lead (Hsu-Nielsen) on the surface of the rock samples at different AE source locations. Ten repetitions of pencil lead fracturing were performed at a given location. A VS150-M piezoelectric sensor with a frequency range of 100–450 kHz was attached to the upper surface of the rock samples. The results showed that the AE energy and the average frequency of the acoustic emission signals in the rock samples decreased with increasing distance from the AE source locations. These results can be used to establish a relationship between the characteristics of the acoustic emission signals and different rock types at different AE source locations.

Fatigue damage assessment of reinforced concrete beam using average frequency and rise angle value of acoustic emission signal

International Journal of Structural Integrity

PurposeIn civil engineering construction, the reinforced concrete (RC) structure is generally use... more PurposeIn civil engineering construction, the reinforced concrete (RC) structure is generally used and exposed to fatigue loading as it is in service. The assessment of the RC structure is required to maintain the service life of the structure.Design/methodology/approachThis paper presents the behaviour of RC beam specimens under increasing maximum fatigue loading until failure. Simultaneously the acoustic emission (AE) was recorded. Twelve phases of maximum fatigue loading at Stage 1 and Stage 2 were applied to the beam with the frequency of 1 Hz and 5,000 load cycles were applied for each load phase. Two AE parameters were analysed and discussed, namely average frequency and rise angle value at CH4 and CH5.FindingsThe results found that the load and crack are closely related to the AE activities in the RC beam specimen when subjected to increasing fatigue loading.Originality/valueTo investigate the AE characteristics of RC beam specimens subjected to 12 phases of maximum fatigue l...