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Second International Forum on Expert Systems and Computer Simulation in Energy Engineering
March, 17-20, 1992, Erlangen, Germany

DOI: 10.1615/ICHMT.1992.IntForumExpSysCompSimEE


ISBN Print: 978-1-56700-486-1

BOILER COMPONENT FATIGUE LIFE MONITORING USING THE DUHAMEL INTEGRAL METHOD AND RAINFLOW CYCLE COUNTING ALGORITHM

pages 11.2.1-11.2.6
DOI: 10.1615/ICHMT.1992.IntForumExpSysCompSimEE.390
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RESUMO

A method of monitoring the thermal stress at the ID of boiler headers and steam drums is described, using a single thermocouple mounted at the ID. The conduction heat transfer differential equation is solved, using the monitored ID temperature as the non-homogenous first boundary condition, and using separation of variables and the Duhamel Integral method in a retrograde form.
The total elastic stress at the inside surface of a hollow cylinder is obtained by adding the mechanical stress caused by the monitored fluid pressure to the calculated thermal stress and is transformed to the inelastic stress-strain history of the tube stub bore hole edge using Neubers Rule and the local strain approach. The patterns of closed stress-strain hysteresis loops are recognized by the Rainflow Cycle counting Algorithm. The fatigue life consumption of individual closed loops is calculated using a modified Coffin-Manson-Basquin-Goodman relationship.

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