scholarly journals Application of state variable method to the analysis of steady-state and dynamic conditions of nonlinear electromagnetic devices

Vestnik IGEU ◽  
2015 ◽  
pp. 27-32
Author(s):  
V.A. Martynov ◽  
◽  
A.N. Golubev ◽  
A.V. Aleynikov ◽  
◽  
...  
Keyword(s):  
Steady State ◽  
Variable Method ◽  
Dynamic Conditions ◽  
State Variable ◽  
Electromagnetic Devices

A Visco-Plastic Constitutive Model for 60/40 Tin-Lead Solder Used in IC Package Joints

1992 ◽  
Vol 114 (3) ◽  
pp. 331-337 ◽  
Author(s):  
E. P. Busso ◽  
M. Kitano ◽  
T. Kumazawa
Keyword(s):  
Steady State ◽  
Constitutive Model ◽  
Bauschinger Effect ◽  
Back Stress ◽  
Steady State Creep ◽  
Stress Dependence ◽  
State Variable ◽  
Hardening Behavior ◽  
Measured Stress ◽  
Ic Package

A new unified visco-plastic constitutive model for the 60 Sn-40 Pb alloy used in solder joints of surface-mount IC packages and semiconductor devices is proposed. The model accounts for the measured stress-dependence of the activation energy and for the strong Bauschinger effect exhibited by the solder. The latter is represented by a back stress state variable which, in turn, evolves according to a hardening-recovery equation. Based on the observed hardening behavior, it is assumed that the isotropic resistance to plastic flow does not evolve within the deformation range covered in this study (ε< 3 percent). The deformation phenomena associated with the solder’s monotonic and steady-state cyclic responses are accurately predicted for −55°C≦T≦150°C and 8 x 10−2 s−1 ≦ ε ≦ 8 x 10−5 s−1. The model also predicts well the overall trend of steady-state creep behavior. The constitutive model is formulated within a continuum mechanics framework and is therefore well suited for implementation into finite element or other structural codes.

Condensate Retention Effects on the Performance of Plain-Fin-and-Tube Heat Exchangers: Retention Data and Modeling

2001 ◽  
Vol 123 (5) ◽  
pp. 926-936 ◽  
Author(s):  
C. Korte ◽  
A. M. Jacobi
Keyword(s):  
Steady State ◽  
Thermal Performance ◽  
Heat Exchangers ◽  
Air Cooling ◽  
Retention Data ◽  
New Approach ◽  
New Model ◽  
Dynamic Conditions

A study of condensate retention is presented for plain-fin-and-tube heat exchangers typical to those used in air-cooling applications. An experiment in which the retained mass of air-side condensate was measured under dynamic conditions is described, and the results are analyzed using conventional thermal-hydraulic measurements of j and f. With the coupling between condensate retention and thermal performance established, a new model for predicting the mass of retained condensate is described and compared to the steady-state retention data. The model is successful in predicting retained condensate under relatively restricted conditions. The promise of this new approach, and possible refinements that will add engineering value are discussed.

scholarly journals Modelling the steady state and dynamic conditions of a biotrickling filter treating styrene and acetone in air

2010 ◽  
Vol 53 (5) ◽  
pp. 1225-1234 ◽  
Author(s):  
Andrew Mark Gerrard ◽  
Josef Havranek ◽  
Vratislav Novak ◽  
Martin Halecky ◽  
Kim Jones ◽  
...  
Keyword(s):  
Steady State ◽  
Biotrickling Filter ◽  
Dynamic Conditions
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