BLADE-ST is a 3D finite element based system for the design and analysis of steam turbine blades, developed under the sponsorship of the Electric Power Research Institute (EPRI). The program has been licensed to turbine manufacturers, consultants, and electric utilities for analyzing designs and determining causes of unexpected failures. With a minimal amount of effort, a user can easily create and analyze a variety of turbine blade configurations for stress, natural frequency and life characteristics. STI has applied BLADE-ST to over 250 different blade designs for a wide variety of manufacturers.


  • Analytical design tool for producing structurally sound blade designs
  • Diagnostic tool for doing Root Cause Analysis (RCA) to explain why a blade, or disk, has failed
  • Redesign tool to verify proposed changes to a design
  • Evaluation tool to compare competing design offerings from different vendors


Key Capabilities

  • Rapid model generation for quick turnaround analysis
  • Dedicated Finite Element model generation routines, including automatic assignment of boundary conditions
  • Extensive analysis capabilities including steady stress, natural frequency and mode shape calculations
  • User-friendly environment for those less practiced in Finite Element Analysis techniques
  • Automated post-processing of results, including color contour plotting and generation of Campbell and interference diagrams

Modeling Capabilities

  • Windows NT/2000/XP platform
  • Finite element model generation utilizing parametric data input
  • Steady steam forcing calculation based on aerodynamic and thermodynamic analysis
  • Free standing and shrouded blades
  • Apply to Z-lock or midspan shrouds
  • Airfoil is defined with a series of 2D profiles
  • Six different blade attachment styles including
  • Axial entry firtree
  • Tangential entry internal ('T' root)
  • Tangential entry external(straddle root)
  • Radial entry (finger root)
  • Full disk modeling
  • User control of mesh densities
  • Translator for ANSYS FEA program
  • Internal material database for both mechanical and fatigue properties

Analysis Capabilities

  • Thermal, stress and modal analysis, including cyclic symmetric modal analysis of bladed-disk structures
  • Forced harmonic response and vibratory stress calculations
  • Low- and high-cycle fatigue calculations
  • Damage tolerant analysis using stress data directly from finite element results.
  • Advanced fatigue life and strength estimations using the local strain approach and Goodman diagrams

Post Processing

  • Intuitive stress, temperature and displacement viewing
  • Point-and-click identification of result quantities
  • Animated mode shape plotting.
  • Auto-generated interference diagrams
  • Campbell diagrams

Key Benefits

  • Quickly and accurately identify causes of failures
  • Analyze new blade configurations and identify potential problems before they occur
  • Assess the remaining blade life, optimize blade life cycles and maintenance schedules
  • Estimate the life consumed and likelihood of blade failure under actual working conditions
  • Modify operating schedules to maximize remaining life

STI Software Support

STI provides training which includes tutorials on the use BLADE-ST, as well as background on the structural dynamics of the components being analyzed, and their application to real-world problems. In addition, technical support, as needed, is provide by a fully knowledgeable staff.

Additional Information

Download the BLADE-ST Brochure (pdf format)
Download the BLADE Post-Processing Demo

Custom Software | BLADE-ST | STELLA | MHE | IMPRO