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All Journal Scientific Journal of Mechanical Engineering Kinematika
Rhakamerta Hijazi
Badan Riset dan Inovasi Nasional (BRIN)
Automotive Engineering Energy Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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DETEKSI CACAT PADA CARBON FIBER REINFORCED POLYMER BERDASARKAN KOEFISIEN KORELASI PEARSON DARI SINYAL ECHO ULTRASONIK Yusuf Giri Wijaya; Suprijanto Suprijanto; Afid Nugroho; Rhakamerta Hijazi; Damar Rastri Adhika
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v9i2.322

Abstract

Carbon fiber reinforced polymer (CFRP) is a composite material widely used in the aerospace, automotive, and marine industries due to its high strength and low weight. However, the reliability of CFRP can be compromised by internal defects occurring during manufacturing or use. This study aims to detect defects in CFRP using the Pearson correlation coefficient from ultrasonic echo signals. This method utilizes ultrasonic waves to identify defects based on changes in signal patterns. The reference signal is obtained by averaging the signals from several defect-free locations. Variations in the measurement signals compared to the reference signal are quantified using the Pearson correlation coefficient to classify defect-free and defect-containing areas. The test samples consisted of thin CFRP plates with artificial defects created using Teflon material in the form of circles with a radius of 15 mm, placed at two different depths. The results indicate that the Pearson correlation coefficient effectively distinguishes between defect-free and defective areas. Defect-free areas showed correlation values in the range of 0.97 to 1, while defective areas showed low correlation values in the range of 0 to 0.36.
SISTEM UJI TAK RUSAK BERBASIS ULTRASONIK UNTUK KONTROL KUALITAS PADA FABRIKASI BATA TIMBAL Rhakamerta Hijazi; Suprijanto; Freddy Haryanto; Ahmad Haerudin; Yusuf Giri Wijayaa; Jos Budi Sulistyo
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/sjmekinematika.v9i2.323

Abstract

BATAN has the authority to improve the quality of lead brick production, which is still fabricated conventionally. Therefore, a non-destructive testing system has been developed, consisting of a Partial Immersion Technique transducer used to maintain a perpendicular scanning angle due to the uneven surface of the lead brick, an un0rick board used for its flexibility and good capability in generating high-voltage electrical pulses and high sampling frequency, and a laptop. The result is the optimization of ultrasonic parameters, with a transducer frequency of 500 KHz and a pulse length of 0.5 μs. Additionally, tests were conducted on three cases. A standard lead brick used as a reference has a propagation speed of 2.156 m/s. The lead brick with artificial defects had the first defect location estimated at 23.32 mm with an error of 16.62%, the second defect location estimated at 25.1 mm with an error of 0.44%, the third defect location estimated at 36.17 mm with an error of 9.57%, and the fourth defect location estimated at 9.38 mm with an error of 6.2%. The third case, a lead brick with natural defects, had the defect location estimated at 26.77 mm with an error of 1.08%.
Co-Authors Afid Nugroho Ahmad Haerudin Damar Rastri Adhika Freddy Haryanto Jos Budi Sulistyo Suprijanto Suprijanto Suprijanto Yusuf Giri Wijaya Yusuf Giri Wijayaa