Strength Evaluation of Pompong Structure Made from High Density Polyethylene Plastics as Basic Materials

Abstract

High density polyethylene plastic (HDPE) can be used as an alternative material for the construction of pompong ships in the Riau coastal waters, as the wood material is limited at this time. A study to understand the specifications of strength of pompong that are commonly used in Riau waters (3 GT, 10.2 m Length) has been conducted. The tensile strength of HDPE plastic is tested according to ASTM D638-02a standards with the intention of material strength properties and then being compared with the strength of the material that satisty the rule class standards. Results shown that the tensile strength is 17.12 MPa Yield Strength and the Ultimate Strength is 24.82 MPa. Data are then verified using a finite element method (FEM), where the ship are modelled using ANSYS Workbench 12.0 (3 models). The maximum stress of all models occur in the load cases 1 and load case 3. The load case 1 is the condition when the ship is empty, payload 100% and fuel 100%. While the load case 3 is full charge of 100%, net charge 100% and 10% fuel. The maximum tensile stress is 11.67 MPa, however, the tension does not exceed 17 MPa as required by the class rules. Its safety factor is 1.45, meanwhile the maximum compression stress is 15.82 MPa with a safety factor of 1.26 toward the standard class rule.