Dear ANSYS Experts, I have been asked to do some primary (transient) creep modeling using ANSYS. The proposed primary creep model is Bailey-Norton model (strain = C0*stress^C1*time^C2*exp(-C4/Temp)) please note that this equation obtains the strain - reference: Table 1 of Mukhrejee et al., (2016), “Creep Constitutive Models Suitable for Solder Alloys in Electronic Assemblies”, Journal of Electronic Packaging, Vol 138, 3. Many other primary creep models are mentioned and all compute the strain as a function of time, stress and/or temperature. The above paper cites the original reference of the Bailey-Norton model which I tried to find but I didn’t succeed. This cited reference is: Norton & Bailey (1954),” Creep of Steel”, Trans. ASM, 52, p. 114. If anyone could provide this paper I will be very grateful. However, When I read TFM, I noticed that this model is given for the strain rate (strain rate = C0*stress^C1*time^C2*exp(-C4/Temp)), in Mechanical APDL Materials Reference R19.0. This has been scratching my mind in the last few days. Is it just a typo somewhere or am I missing something? I would love some inputs from ANSYS guys of this list. Best, Mohammad -- ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 =====================================

I found this from SOLIDWORKS help which states that the primary creep strain is given by the equation mentioned in my previous email of Mukhrejee et al., (2016), “Creep Constitutive Models Suitable for Solder Alloys in Electronic Assemblies”, Journal of Electronic Packaging, Vol 138, 3. https://help.solidworks.com/2012/english/SolidWorks/cworks/Creep_Models.htm?format=P&value= If ANSYS uses the same equation considering primary creep “strain rate”, I think this is a problem. Or maybe there’s something I cannot catch. Any thoughts? Best, MG — Guest Professor IMTEK University of Freiburg On Monday, October 9, 2023, Mohammad Gharaibeh <mgharai1@binghamton.edu> wrote: > Dear ANSYS Experts, > > I have been asked to do some primary (transient) creep modeling using > ANSYS. The proposed primary creep model is Bailey-Norton model (strain = > C0*stress^C1*time^C2*exp(-C4/Temp)) please note that this equation > obtains the strain - reference: Table 1 of Mukhrejee et al., (2016), > “Creep Constitutive Models Suitable for Solder Alloys in Electronic > Assemblies”, Journal of Electronic Packaging, Vol 138, 3. Many other > primary creep models are mentioned and all compute the strain as a function > of time, stress and/or temperature. > > The above paper cites the original reference of the Bailey-Norton model > which I tried to find but I didn’t succeed. This cited reference is: Norton > & Bailey (1954),” Creep of Steel”, Trans. ASM, 52, p. 114. If anyone could > provide this paper I will be very grateful. > > However, When I read TFM, I noticed that this model is given for the > strain rate (strain rate = C0*stress^C1*time^C2*exp(-C4/Temp)), in > Mechanical APDL Materials Reference R19.0. > > This has been scratching my mind in the last few days. > > Is it just a typo somewhere or am I missing something? I would love some > inputs from ANSYS guys of this list. > > Best, > Mohammad > > > > -- > ===================================== > Mohammad A Gharaibeh, Ph.D. > Associate Professor > Department of Mechanical Engineering > The Hashemite University > P.O. Box 330127 > Zarqa, 13133, Jordan > Tel: +962 - 5 - 390 3333 Ext. 4771 > Fax: +962 - 5 - 382 6348 > ===================================== > > > > -- ===================================== Mohammad A Gharaibeh, Ph.D. Associate Professor Department of Mechanical Engineering The Hashemite University P.O. Box 330127 Zarqa, 13133, Jordan Tel: +962 - 5 - 390 3333 Ext. 4771 Fax: +962 - 5 - 382 6348 =====================================