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SINT Technology s.r.l. Tel: +39.055.8826302 · Fax: +39.055.8826303 · [email protected] · www.sintechnology.com
Eval 7
Residual stress analysis software
SINT Technology s.r.l. Tel: +39.055.8826302 · Fax: +39.055.8826303 · [email protected] · www.sintechnology.com
Main features
Eval 7: residual stresses calculation by the hole-drilling method
Several theoretical models have been developed by many research centers in order to evaluate the residual stress
field produced by the strains measured by a strain gage rosette. Some of them (standard ASTM E837-08, Integral
method and Differential method) were already introduced in the standard version of the EVAL 6 software for the
calculation of residual stresses by the hole drilling method.
In the EVAL 7 software, the standard alghorims are improved with
additional features and a better graphical overview including a further
database of strain gage rosettes and materials.
Moreover, a new theoretical algorithm, named HDM, has been
implemented: this model is able to provide a further analysys of the
residual stress field that improve even more the standard residual stress
analysys.
The HDM method is an evolution of the standard calculation
algorithms that provides equivalent results to the Integral and ASTM
method with a more powerful calculation process and with the
possibility to correct the main sources of uncertainty of this method: the eccentricity and the local plasticity errors.
The new graphical layout with the upper control pannel makes easy, intuitive and sequential the calculation
process: all these new features make the software EVAL 7 an essential tool for your analysis.
Available methods for stress analysis:
ASTM E837-08 for uniform stress field
Through hole stress evaluation with local
plasticity correction
ASTM E837-08 for non uniform stress field
Integral Method
Differential method
HDM method
Internal strain gage database
Internal material database
Measurement filtering for an optimal reduction
of measurement disturbs effects
Off axis hole drilling correction
Tikhonov regularization
High level 2D and 3D postprocessing tools for an
easier analysis of the stress field
Automatic test report
Direct interface with SINT Technology hardware
for hole drilling (RESTAN-MTS3000 system)
New graphic layout
Eval 7 Residual Stress Analysis Software
SINT Technology s.r.l. Tel: +39.055.8826302 · Fax: +39.055.8826303 · [email protected] · www.sintechnology.com
During the preprocessing stage, the software
supports the user by means of a predefined
and updated database of material properties
and commercial strain gage geometries in
order to allow a fast and reliable definition of
the test conditions.
Eval 7 Residual Stress Analysis Software
Several output formats are available for an accurate analysis of the calculated stress field:
Preprocessing
Stress calculation
During the stress calculation stage, the software provides
the user with the most updated methods for stress
evaluation (ASTM E837-08, Kockelmann method, Integral
method and HDM method) for an accurate back-calculation
of the stress field.
Advanced tools are available for the correction of the errors
due to casual off axis drilling or plasticity conditions.
Moreover, numerical regularizations of the stress field are
available in order to compensate ill-conditioned configurations:
in particular, the Tikhonov’s correction and the least square
method. Automatic optimal choice of the analysis parameters
is also available whenever required.
Postprocessing
Standard direct plot of principal stresses
and principal angle vs hole depth in the
thickness
3D views of the Mohr’s circles of the stress
field vs depth, with the possibility to focus
on particular positions into the thickness
for a more detailed investigation
Direct calculation of the stress components
according to the requested directions with
reference to the strain gage rosette
Automatic test report in html and txt format
Moreover, the user can take advantage of improved tools provided in
order to filter the possible measurement disturbances and to minimize
their effect on the final result. The choice of the filtering parameters
can be done manually or automatically by means of the optimization
routine implemented in the HDM calculation program for this purpose.
SINT Technology s.r.l. Tel: +39.055.8826302 · Fax: +39.055.8826303 · [email protected] · www.sintechnology.com
Eval 7 Residual Stress Analysis Software
References
Contact us
Via delle Calandre, 63 - 50041 Calenzano (FI) ITALY
Tel: +39.055.8826302
Fax: +39.055.8826303
www.sintechnology.com
VAT n. 04185870484
Recognitions
SINT Technology’s test laboratory is accredited to standard ISO/IEC
17025:2005 by the Italian accreditation body ACCREDIA with
certificate no. 0910
Certification of conformity to the requirements of standard
UNI EN ISO 9001
ASTM E 837-08, “Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain-Gage Method”
Schajer, G. S., “Measurement of Non-Uniform Residual Stresses Using the Hole-Drilling Method. Part I - Stress Calcula-
tion Procedures”, Journal of Engineering Materials and Technology, Vol. no. 110, 1988, pages 338-343
Schajer, G. S., “Measurement of Non-Uniform Residual Stresses Using the Hole-Drilling Method. Part II - Practical Appli-
cation of the Integral Method”, Journal of Engineering Materials and Technology, Vol. no. 110, 1988, pages 344-349
Schwarz, T., Kockelmann, H., “The hole-drilling method - the best technique for the experimental determination of resid-
ual stresses in many fields of application”, MTB 29, 1993, Vol. no. 2, pages 33-38
Beghini M., Bertini L., Rosellini W., “Genetic algorithms for variable through thickness residual stress evaluation”, 5th Eu-
ropean Conference on Residual Stresses – Delft, 28-30 September 1999
M Beghini, L Bertini, L F Mori and W Rosellini, “Genetic algorithm optimization of the hole-drilling method for non-
uniform residual stress fields”, accepted for publication, DOI: 10.1243/03093247JSA457
E.Valentini, A.Benincasa, “Calcolo ottimizzato di tensioni residue con foro eccentrico”, AIAS—XXXVII CONVEGNO NAZIONA-
NAZIONALE, 10-13 SETTEMBRE 2008