Analysis Of Polyurethane Foam Strength On Fiber-Based Vessels

Wahab, Gilang Gemilang Wahyu (2026) Analysis Of Polyurethane Foam Strength On Fiber-Based Vessels. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Busa poliuretan kaku sel tertutup (RPUF) banyak digunakan pada kapal berbahan komposit fiber sebagai inti sandwich, daya apung cadangan, dan insulasi, sehingga kekuatan tekannya menentukan kemampuan strukturalnya. Penelitian ini mengevaluasi, dengan metode elemen hingga (ANSYS), kekuatan tekan RPUF sebagai fungsi densitas (40–120 kg/m³) dan arah pengembangan busa, dibandingkan terhadap ASTM D1621, kemudian menerapkan busa yang telah tervalidasi sebagai inti panel sandwich fiberglass. Pada fase kupon, sepuluh analisis menunjukkan tegangan tekan meningkat mengikuti σ ∝ ρ², sekitar 31% lebih tinggi sejajar arah pengembangan, dan sesuai data publikasi dalam ±3% pada densitas rendah. Pada fase struktural, panel sandwich 1 m × 1 m (kulit 3 mm / inti 20 mm / kulit 3 mm) dibebani tekanan lateral, geser bidang, dan tekuk. Dibandingkan laminat kulit tunggal setara, inti busa mengurangi defleksi sekitar 26 kali, menurunkan tegangan kulit puncak sekitar 7 kali, dan menaikkan ketahanan tekuk sekitar 25 kali dengan tambahan berat hanya 15%.
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Rigid closed-cell polyurethane foam (RPUF) is widely used in fiber-reinforced plastic vessels as a sandwich core, reserve buoyancy, and insulation, where its compressive strength governs its structural duty. This study evaluates, by finite element analysis in ANSYS, the compressive strength of RPUF as a function of density (40–120 kg/m³) and rise direction, benchmarked against ASTM D1621, and then applies the validated foam as the core of a representative fiberglass sandwich hull panel. In the coupon phase, ten analyses show that compressive stress rises with density following σ ∝ ρ², is about 31% higher parallel to the rise direction, and agrees with published data to within about 3% at low density, over-predicting at high density because the linear-elastic model has no yield plateau. The coupon quantity is the compressive stress at 2% strain (modulus-controlled, σ ∝ ρ²), not the true compressive strength; Phase 1 characterises stiffness-controlled stress rather than predicting strength. In the structural phase, a 1 m × 1 m sandwich panel (3 mm skin / 20 mm core / 3 mm skin) is loaded under lateral pressure, in-plane shear, and buckling. Against an equal-skin single-skin laminate the foam core reduces deflection about 26 times, lowers peak skin stress about 7 times, and raises buckling resistance about 25 times for only 15% more weight. The results quantify both the material behaviour of RPUF and the structural benefit it delivers as a fiberglass sandwich core.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	rigid polyurethane foam, compressive strength, sandwich structure, fiberglass, finite element analysis.
Subjects:	V Naval Science > VK > VK200 Merchant marine--Safety measures
Divisions:	Faculty of Marine Technology (MARTECH) > Naval Architecture and Shipbuilding Engineering > 36201-(S1) Undergraduate Thesis
Depositing User:	Gilang Gemilang Wahyu Wahab
Date Deposited:	31 Jul 2026 04:09
Last Modified:	31 Jul 2026 04:09
URI:	http://repository.its.ac.id/id/eprint/140343

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