Fatigue Screening in COMPRESS

Fatigue is a failure mechanism that involves cracking due to cyclic (or fluctuating) stress.  Fatigue is a progression that starts with small changes in material grain structure.  There are three main stages of Fatigue:

  • Crack Initiation

  • Crack Propagation

  • Rupture

Cracking is typically caused by tensile mechanical stresses that are accompanied by another mechanism such as structural damage or corrosion.  As mentioned in numerous references, fatigue failures can happen at stresses below the yield strength of the material.  From the ASME (VIII-2) point of view Fatigue is defined as “Conditions leading to fracture under repeated or fluctuating stresses having a maximum value less than the tensile strength of the material.”

COMPRESS Fatigue Screening

COMPRESS Supports ASME VIII-2 Fatigue Screening

Starting with build 8300, COMPRESS includes ASME VIII-2 fatigue screening as a standard feature.  The ability to quickly model complete vessels and enter fatigue data makes performing VIII-2 or Appendix 46 Fatigue Assessments with COMPRESS simple.

ASME Division 2 Fatigue Screening 5.5.2.4 Method B

Professional Reports

COMPRESS provides professional fatigue reports that document the data entered and equations used.  A convenient summary lists the limiting pressure vessel component.

Fatigue Screening - Inputs Report
Fatigue Screening - Component Results
Fatigue Screening - Stress Amplitude Report
Fatigue Screening - Full Range Pressure Cycles Report

COMPRESS Pressure Vessel Design Highlights

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