Muhammad Agus Kariem

Characteristics of Three Structural Steels at High Strain Rate

Material characteristics at high strain rates are used for various applications involving high speed loading, one of which is plasticity-based impact energy absorbers. In this paper, experimental result of Split-Hopkinson Pressure Bar (SPHB) test of three common structural steels is reported and discussed. The three materials consist of JIS G3101 SS400, API5L Grade B, and S355JR. The material characteristics are presented in Johnson-Cook constitutive equations, and the corresponding parameters have been found through curve fitting. The results are comparable with those of literatures for other carbon steels, hence the acquired data may enrich the database of constitutive equations for various materials, especially carbon steels. The data can then be used for crashworthiness simulation in the future with the corresponding materials.

Stability Analysis of Rail-Conveyor for Coals Transportation

A Rail-Conveyor can be used as one of solutions for transportation of coal production. This system was rated to have either a competitive capital investment, and operational & maintenance cost, when compared with conventional transportation system.This paper studies a stability analysis of the wagon of the Rail-Conveyor in order to prevent derailment in longitudinal and lateral directions. The main aims of this study are to determine the maximum acceleration, deceleration, operational velocity for all possible conditions such as incline slope, decline slope, and turning with a specific radius. Case study was conducted for the wagon diameter of 0.76 m. The loading conditions were classified into two cases: empty wagon and fully-loaded wagon. It was assumed that the maximum allowable slope was 20%. The result of this analysis will be used as a basic design for rail-conveyor operation, route selection, and power station location & its capacity.