Inelastic stress analysis and failure prediction of the turbine housing in engine motoring tests

Abstract

In order to predict the thermomechanical failure of the turbine housing, it is essential to consider temperature-dependent inelastic materials undergoing thermal cyclic loads and to obtain the transient temperature distributions. This paper presents the analysis methods to calculate the thermal stresses and the plastic strain ranges for prediction of the fatigue life. The presented work is based on the engine motoring mode test that is commonly used for accelerated engine endurance tests. The results showed that the localized critical regions coincided well with the crack locations identified on the basis of a thermal shock test. The plastic strain values were predicted to lie within the range 0.216–0.396% corresponding to a range of 628–1450 cycles for 1600 target cycles.

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

“…5,[20][21][22][23]24 Thermal stress mainly studies the thermal displacement of turbine housing under thermal load, that is, the temperature gradient caused by uneven structure and uneven boundary load of turbine housing, and then forms thermal stress. 5,13,[25][26][27][28] For measuring the stress and strain on the surface of an object, DIC is a good tool for measuring the full-field strain diagram on the surface of the object. [29][30][31] Measuring strain response during hightemperature loading is key to determine the mechanical and thermal properties of materials that are used at high temperatures.…”