Forecasting of Life Span of Diesel Engine’s Emission Reduction System

Abstract

In the design of toxicity reduction system of emissions the main factor for forecasting of system lifetime will be the right determination of crippling external load that leads to full failure of system’s elements. There was considered system of manufacturing from structural inhomogeneous material, containing abnormalities of type cracks. There was studied mutual interaction of crack with the field of circular holes in plate. There was considered one case, when size of crack is more than radii of punched holes. There was obtained dependence of average values of critical load from disposition of micro pores and level of material damage, calculated value of crippling external load, that leads to cracks contraction. There was established that at disposition of micro pores in front of micro cracks, the average fracture strength decreases by 30 %, at disposition micro pores over or under micro crack the average fracture strength increases by 46 %. Under distributed porousness fracture strengthdeclines. Offered technique allows forecast life span of emission reduction system during the stage of its design, taking into account mutual interaction of crack with micro defects of material.