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Hijazi, Rhakamerta
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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; Nugroho, Afid; Hijazi, Rhakamerta; Adhika, Damar Rastri
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024 (ongoing -Full)
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) adalah material komposit yang sering digunakan dalam industri penerbangan, otomotif, dan kelautan karena kekuatannya yang tinggi dan beratnya yang ringan. Namun, keandalan CFRP dapat terganggu oleh cacat internal yang terjadi selama proses manufaktur atau penggunaan. Penelitian ini bertujuan untuk mendeteksi adanya cacat pada CFRP berdasarkan koefisien korelasi Pearson dari sinyal echo ultrasonik. Metode ini menggunakan gelombang ultrasonik untuk mengidentifikasi cacat berdasarkan perubahan pola sinyal. Sinyal referensi diperoleh dengan merata-ratakan sinyal dari beberapa lokasi bebas cacat. Perubahan pola sinyal terhadap sinyal referensi dikuantifikasi menggunakan koefisien korelasi Pearson untuk mengklasifikasikan daerah bebas cacat dan yang memiliki cacat. Sampel uji berupa plat tipis CFRP dengan cacat buatan dari material teflon berbentuk lingkaran dengan jari-jari 15 mm yang diletakkan pada dua kedalaman berbeda. Hasil penelitian menunjukkan bahwa koefisien korelasi Pearson efektif membedakan antara area bebas cacat dan yang memiliki cacat. Area bebas cacat menunjukkan korelasi dalam rentang 0,97 sampai 1, sementara area dengan cacat menunjukkan korelasi rendah dalam rentang 0 sampai 0,36.
SISTEM UJI TAK RUSAK BERBASIS ULTRASONIK UNTUK KONTROL KUALITAS PADA FABRIKASI BATA TIMBAL Hijazi, Rhakamerta; Suprijanto; Haryanto, Freddy; Haerudin, Ahmad; Wijayaa, Yusuf Giri; Sulistyo, Jos Budi
Scientific Journal of Mechanical Engineering Kinematika Vol 9 No 2 (2024): SJME Kinematika Desember 2024 (ongoing -Full)
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 Ahmad Haerudin Damar Rastri Adhika Freddy Haryanto Jos Budi Sulistyo Nugroho, Afid Suprijanto Suprijanto Wijayaa, Yusuf Giri Yusuf Giri Wijaya