Multilevel approach to lifetime assessment of steam turbines

Numerical Modeling of Cyclic Creep-Fatigue Damage Development for Lifetime Assessment of Steam Turbine Components

“…Instead of estimating the plastic strains based on thermoelastic stresses and using analytical notch stress-strain correction methods [4,14], a more accurate approach with direct use of elastic-plastic material was adopted. Numerical calculations were performed using Abaqus [21], employing elastic-plastic material model with the Prager-Ziegler linear kinematic hardening.…”

“…Safe and reliable operation of steam turbines can only be ensured with proper monitoring systems, periodic inspections and comprehensive lifetime assessment studies [4][5][6].…”

Analiza termodynamiczna i techniczna zeroemisyjnej elektrowni dla pomorza

“…It is well known that the most exploited stages of turbines (especially steam turbine) are the first and last [34][35][36]. The high pressure stages of steam turbine are designed for majority new types of turbines, because the possibility to manufacture the cylindrical profile of blade is relatively simple.…”

“…The complexity of the configuration such as non-uniform cross-section, twist, thickness, and curvature makes the research of blades of the last stage difficult [36]. On the other hand, it is quite significant for the design, safety and lifetime of machinery to determine their dynamic characteristics accurately because they are working at high speed -this prompts researchers and producers to devote greater efforts to the problem [34][35][36].…”

“…In particular, it is important to investigate the stress state of turbine and steam boilers [28,34,37,38]. Some elements of above facilities are manufactured with high-strength steels or, in general, ultra-fine grained alloys and nano-metals.…”