Is the Viscoelastic Sheet for Slamming Impact Ready to Be Used on Glass Fiber Reinforced Plastic Planning Hull?

Patrick Townsend,Nadia Muñoz,Juan Carlos Suárez Bermejo,Paz Pinilla

doi:10.3390/app10186557

Patrick Townsend, Nadia Muñoz + Show 2 more

Open Access

https://doi.org/10.3390/app10186557

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Abstract

Planing hull vessel built with polymer matrix laminates and fiberglass reinforcements (GFRP) suffer structural damage due to the phenomenon of slamming during navigation, due to the impact of the boat hull on the free surface of the water at high speed. A modification in the manufacture of the laminates for these fast boats is proposed, consisting of the insertion of an additional layer of a hybrid material, formed by elastomer encapsulated in an ABS polymer cell. Using GFRP specimens made from pre-impregnated material and reproducing the characteristic impacts of slamming, it is possible to compare the modified material with the introduction of the viscoelastic layers with the response under the same conditions as the unmodified laminates. Additionally, the panels have been tested using impacts due to weight drop at different energies, which allow determining the material damage threshold as a function of the energy absorbed, and to establish a comparison with the GFRP panels modified by observation in fluorescent light. It is verified that the proposal to reduce the effect of these impacts on the generation of damage to the material and its progression throughout the service life of the vessel is effective.

Highlights

Slamming is an important event during the navigation of the ship, and it appears as a sudden force that vertically impacts the ship in the bow and generates energy from the impact between the hull and the water surface
For the calculation calculation of slamming slamming pressures according according to the the ABS classification classification rules, the the typical
These results considered for the Panels relationship between low energy slamming impacts and 5 impact cycles with P = 420

Summary

Introduction

Slamming is an important event during the navigation of the ship, and it appears as a sudden force that vertically impacts the ship in the bow and generates energy from the impact between the hull and the water surface This force translates into pressure that acts on a very small surface and is so unpredictable that it still requires investigation [1]. The complexity of the phenomenon is due to the fact that the fluid enters the bottom of the ship due to the angular difference between the body surface, expanding at high speed This generates very high pressures that are very important issues in the design of the ships. The answers about this phenomenon and its influence on the structure of the vessels have not been fully resolved and it is more complicated when they are GFRP planning vessels [2,3]

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