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The CreepLife™ computer program
is now available from CC Technologies Systems, Inc. This computer
program provides state-of-the-art methodology for assessing
the creep-rupture life, creep-crack-growth life, and fracture
potential of cylindrical pressure vessels and pipes. CC Technologies
Systems, Inc. is licensing CreepLife™ for individual
use on MS-DOS and Macintosh personal computers equipped with
math co-processors.
Program Development
The CreepLifeTM computer program was developed by Dr. C. E.
Jaske of CC Technologies Systems, Inc.. It is a user-friendly,
interactive computer program that employs both creep-rupture
modeling and inelastic fracture mechanics to assess the life
of high-temperature cylindrical pressure vessels and pipes.
The CreepLife™ software is designed for easy use on personal
computers. The key feature of the CreepLife™ program
is an interactive data entry. The input data can be saved
in a file for later editing and re-use. Material properties
and damage models are incorporated for two alloys: 2-1/4Cr-1Mo
steel and 1-1/4Cr-1/2Mo steel. Properties are included for
both welds and base metal. The user can add properties for
other alloys by preparing a text file of materials data and
materials constants. The CreepLife™ software comes with
an extensive user manual that describes the theoretical basis
of the analytical methods, provides instructions for using
the software, and presents sample problems. Results of CreepLife™
calculations can be easily saved to a text file for subsequent
printing and graphing.
The CreepLife™ program has been used
to assess the life of seam-welded hot reheat steam lines,
main steam lines, and welded petro-chemical process vessels.
Model Operations
CreepLife™ can model cyclic operations. The operating
history is simulated by a series of up to 100 load steps.
The series of unique load steps is defined as a block of the
operating history. A block of simulated operation is repeated
a specified number of times or until failure is predicted.
CreepLife™ computes both creep-rupture and creep-crack-growth
life. The Larson-Miller parameter is used to model creep-rupture
behavior, and the Robinson time-fraction rule is used to compute
creep damage. The Cj parameter is used to model creep-crack-growth
behavior. The J integral or the flow strength is used to compute
estimates of critical crack size using Jlc fracture-toughness
or tensile-strength data, respectively.
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