Studi Kepecahan Moda Kegagalan Material A36 dengan Variasi Panjang Retak Terpusat

Budiman, Muhammad Alif (2019) Studi Kepecahan Moda Kegagalan Material A36 dengan Variasi Panjang Retak Terpusat. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kecelakaan kapal sering terjadi diakibatkan kerusakan pada lambung. Lambung kapal merupakan susunan dari beberapa material baja yang dibentuk sedemikian rupa hingga menjadi suatu kesatuan utuh. Salah satu penyebab kerusakan lambung adalah timbulnya initial crack pada material penyusun lambung. Pada penelitian ini, pelat baja A36 yang sering digunakan pada lambung kapal dijadikan dalam skala ukuran spesimen pengujian. Tujuan penelitian ini yaitu menentukan fracture toughness dan tegangan kritis baja A36. Spesimen diberikan beban statis yang diperoleh dari hasil pengujian tarik. Beban tarik pada spesimen uji menghasilkan faktor intensitas tegangan digunakan untuk mengevaluasi fracture toughness dan tegangan kritis yang dapat diterima akibat initial crack. Pemodelan dilakukan sesuai spesimen uji tarik dengan 9 variasi initial crack menggunakan software Finite Element Analysis. Berdasarkan variasi tersebut didapatkan beberapa hasil yang dibandingkan untuk mengevaluasi faktor intensitas tegangan, fracture toughness dan tegangan kritis akbiat intial crack. Untuk mengevaluasi dilakukan pengujian tarik (eksperimen) serta dua pendekatan yaitu XFEM setiap K mode I dan J-Integral. Didapatkan hasil fracture toughness material A36 dari eksperimen sebesar 1413.7154 MPa√mm; metode XFEM setiap K mode I mengahasilkan fracture toughness A36 sebesar 1412.6214 MPa√mm dan J-Integral menghasilkan fracture toughness A36 sebesar 1414.7809 MPa√mm. Perbedaan nilai fracture toughness terhadap eksperimen diperoleh eror sebesar 0.077% (XFEM setiap K mode I) dan 0.075% (J-Integral).
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Ship accidents often occur due to damage to the hull. The hull is an arrangement of several steel materials that are formed in such a way that they become a block. One of the causal factors associated with hull damage is the emergence of an initial crack in the material In this study, A36 steel plates are used frequently on the hull of the ship as part of a test specimen size scale. The purpose of this study is to determine fracture toughness and critical stress of A36 steel. Specimens are given static loads which are obtained from tensile test results. Tensile load on tensile test specimens produce stress intensity factors are used to evaluate fracture toughness and critical stress based on initial crack. Modeling is done in accordance with specimens with 9 initial crack variations using Finite Element Analysis software. Based on these variations, some results were compared to evaluate stress intensity factors, fracture toughness and critical stress during intial crack. To evaluate the tensile test and two approaches known as XFEM each K mode I and J-Integral. Form test, the values of fracture toughness material A36 of 1413.7154 MPa√mm; XFEM method for each K mode I produces fracture toughness A36 of 1412.6214 MPa√mm and J-Integral produces fracture toughness A36 of 1414.7809 MPa√mm. The difference in the value of fracture toughness as compared in the test resulted in an error of 0.077% (XFEM every K mode I) and 0.075% (J-Integral).

Item Type:	Thesis (Undergraduate)
Additional Information:	RSPe 620.112 6 Bud s-1 2019
Uncontrolled Keywords:	Baja A36, Initial Crack, Faktor Intensitas Tegangan, J-Integral, Fracture Toughness
Subjects:	V Naval Science > V Naval Science (General) V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Budiman Muhammad Alif
Date Deposited:	13 Dec 2021 01:00
Last Modified:	13 Dec 2021 01:00
URI:	http://repository.its.ac.id/id/eprint/61700

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