The version currently used in LIMIT was published by the Association of American Railroads in the year 2015. The title of the code is:
MANUAL OF STANDARDS AND RECOMMENDED PRACTICES
SECTION C—PART II
DESIGN, FABRICATION, AND CONSTRUCTION OF FREIGHT CARS
ISSUE OF 2015
The fatigue strength assessment in LIMIT® according to the AAR, Section C-Part II, is based on S-N curves and damage calculation. Only nominal stress concepts are used. In case of fatigue no specific weld details are taken into account. In case of static assessments local nominal stresses which include also the stresses in weld throats based on the cross section of the throat are used. The implemented version can be used for non-welded and welded steel. The AAR, Section C-Part II also includes S-N curves for welded and non-welded aluminum. Currently this feature is not included in LIMIT®, but can easily be added on request.
The different assessment types are:
- Static Strength
- Variable amplitude fatigue with result type degree of utilization
- Variable amplitude fatigue with result type damage
- Variable amplitude fatigue with result type fatigue life distance in miles
The stress unit used in the code is KSI (kilo pounds per square inch). When using the AAR the stresses from the finite element analysis must be available in KSI. When stresses are available in MPa, they can be converted in LIMIT®.
Fields of Application
- railway industry worldwide
For detailed information please contact our LIMIT® support.