In the design process, the performance of rubber fenders is considered in terms of deflection-reaction force characteristics in compression and the energy absorption calculated from these characteristics.
In the design process, the performance of rubber fenders is considered in terms of deflection-reaction force characteristics in compression and energy absorption calculated on the basis of these characteristics. Rubber has viscoelastic properties and its performance is influenced by the natural environment and conditions of use.
Factors affecting performance are called influencing factors and must be taken into account when designing rubber fenders.
Simply a matter of convenience and ability of the test facility. Although the rated performance should be exhibited in actual berthing, the demonstrable performance is regarded as the standard performance. The practical design is expected to correspond to the design performance based on design conditions.
In such a case, the influence coefficients of the reaction force and energy absorption are also equivalent. When selecting a rubber fender, it is not necessary to determine strain-specific values, and determining only the coefficient at the design strain is sufficient. Thus, the strain-specific influence factors are considered only when required.
Rubber fenders are made primarily of natural rubber produced from sap and synthetic rubber made from petroleum;the rubber is mixed with chemicals, such as sulfur and carbon, and subsequently vulcanized by heat and pressure. Therefore, the fender performance is different under various conditions such as seasonal variations and differences in the manufacturing processes. Fig. shows an example of the frequency distribution of the ratios of the test values to the catalogue values of the energy absorption (CpE) of various rubber fenders pertaining to different manufacturers 4)
According to Fig. the production tolerance generally falls within ± 10%. Furthermore, since the change in shapes of performance due to the production tolerance is nearly negligible, the coefficients of reaction force and energy absorption may be equivalent
Stability of D-type rubber fenderDecember 16, 2024The quality of D-type rubber fenders always restricts production and use, interferes with docking and the safety of ship drivers, and affects the schedule of production ships. This is not an accidenta...view
How to regularly inspect marine rubber fenders?December 16, 2024After installing the marine rubber fender, when the ship is docked for inspection, it should be inspected every time. Regardless of whether it is parked for inspection or not, it should be inspected r...view
Commonly used Ten types of rubber fendersDecember 16, 20241 GD type rubberl Smaller bottom width size, especially suitable for framed docksl High energy absorption and high reaction force.l High installation strength and long service life.2. Super Dru...view
Three common causes of damage to rubber fendersDecember 16, 20241. Ship overloadedThis kind of damage often occurs in rubber fenders, especially some old rubber fenders, which often crack at the weak points of the structure. The cracks are generally along the leng...view
EN
