Ashary, Yudha (2026) Analisis Pengaruh Beban Termo-Mekanis Dengan Variasi Dan Karakteristik Retak Pada Main Steam Strainer Low Carbon Steel Astm A515 Gr.70 Berbasis Failure Assesment Diagram Menggunakan Metode Elemen Hingga. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Penelitian ini menganalisis integritas struktural komponen Main Steam Strainer berbahan baja karbon rendah ASTM A515 Gr.70 yang beroperasi di bawah beban termo-mekanis ekstrem. Fokus utama penelitian adalah mengevaluasi pengaruh variasi panjang (2c = 40–60 mm) dan kedalaman retak (a = 4–14,5 mm) serta perbedaan orientasi retak (horizontal dan vertikal) terhadap risiko kegagalan komponen. Simulasi dilakukan menggunakan Metode Elemen Hingga (ANSYS Workbench) untuk mengekstraksi nilai Stress Intensity Factor (Keff) dan tegangan referensi pada variasi suhu (160°C–190°C) dan tekanan (0,65–0,90 MPa). Hasil simulasi dipetakan ke dalam kurva Failure Assessment Diagram (FAD) standar API 579-1/ASME FFS-1. Hasil analisis menunjukkan bahwa tekanan internal merupakan faktor pendorong utama kegagalan, di mana peningkatan tekanan dari 0,65 MPa menjadi 0,90 MPa meningkatkan K_eff sebesar ±38,5%, sedangkan peningkatan suhu hanya memberikan pengaruh minor (<1,1%). Terdapat perbedaan mode kegagalan yang signifikan berdasarkan orientasi retak: konfigurasi retak horizontal didominasi oleh mekanisme patahan getas (fracture-dominated) yang menembus batas aman (unsafe region) pada kedalaman a≥8 mm akibat tekanan internal. Sebaliknya, retak vertikal didominasi oleh kegagalan runtuh plastis ulet (net-section plastic collapse) pada kedalaman kritis a=14,5 mm, dengan nilai L_r=3,296. Penelitian ini memberikan kontribusi pada prosedur evaluasi aset kritis melalui pendekatan numerik parametrik yang mampu mengidentifikasi batas keamanan operasional secara akurat.
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This study analyzes the structural integrity of a Main Steam Strainer component made of ASTM A515 Gr. 70 low carbon steel operating under extreme thermo-mechanical loads. The primary focus is to evaluate the effects of crack length (2c = 40–60 mm), crack depth (a = 4–14.5 mm), and crack orientation (horizontal vs. vertical) on failure risk using the Failure Assessment Diagram (FAD) method. Simulations were conducted using the Finite Element Method (ANSYS Workbench) to extract Stress Intensity Factor (K_eff) and reference stress values under varying temperatures (160°C–190°C) and pressures (0.65–0.90 MPa). The results were mapped onto the API 579-1/ASME FFS-1 standard FAD curve. The analysis reveals that internal pressure is the primary driver of failure, as increasing pressure from 0.65 MPa to 0.90 MPa elevates K_eff by ±38.5%, while temperature fluctuations have a negligible impact (<1.1%). Distinct failure modes were identified based on crack orientation: horizontal cracks are governed by fracture-dominated failure, exceeding the safety threshold at a≥8 mm, whereas vertical cracks are governed by net-section plastic collapse at a critical depth of a=14.5 mm (L_r=3.296). This research contributes to critical asset evaluation procedures by providing a parametric numerical approach that accurately identifies safe operational limits.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | ANSYS Workbench, Failure Assesment Diagram, Main Steam Strainer, Metode Elemen Hingga, Mekanika Patahan, Fracture Mechanics, Finite Element Method |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) > TA169 Reliability (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA169.5 Failure analysis T Technology > TA Engineering (General). Civil engineering (General) > TA347 Finite Element Method T Technology > TA Engineering (General). Civil engineering (General) > TA418.38 Materials--Fatigue. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Yudha Ashary |
| Date Deposited: | 23 Jul 2026 03:33 |
| Last Modified: | 23 Jul 2026 03:33 |
| URI: | http://repository.its.ac.id/id/eprint/136515 |
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