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Ranges And Limitations Of Optimum Design For Convecting-Radiating Annular Fins Of Trapezoidal Profile, Benjamin T.F. Chung, Y. Zhou, Y. Wang, L. T. Yeh
Ranges And Limitations Of Optimum Design For Convecting-Radiating Annular Fins Of Trapezoidal Profile, Benjamin T.F. Chung, Y. Zhou, Y. Wang, L. T. Yeh
Dr. Benjamin T.F. Chung
This paper deals with a controversial problem in answering the question “Does the optimum fin design always exist? If not, what are the optimization ranges and limitations?” These authors employ a general example of convecting-radiating trapezoidal annular fin with heat transfer at the tip and wall resistance at the interface. The present results indicate that the answer to the above first question is negative. The ranges of fin optimum design under different thermal and physical conditions are proposed. The effects of Biot number, radiation number, the heat loss at the tip, fin profile and overall wall resistance on fin optimization …
The Third-Type Of Strain Aging And The Constitutive Modeling Of A Q235b Steel Over A Wide Range Of Temperatures And Strain Rates, Jianjun Wan, Wei-Guo Guo, Xiaosheng Gao, Jing Su
The Third-Type Of Strain Aging And The Constitutive Modeling Of A Q235b Steel Over A Wide Range Of Temperatures And Strain Rates, Jianjun Wan, Wei-Guo Guo, Xiaosheng Gao, Jing Su
Dr. Xiaosheng Gao
In this study, uniaxial compression experiments of a Q235B steel are conducted over the temperature range of 93–1173 K and the strain rate range of 0.001–7000 s−1. Through the mechanism analysis, an argument is made that the third-type of strain aging (the 3rd SA) effect, the Portevin–Le Chatelier (PLC) effect and the blue brittleness are different manifestations of the dynamic strain aging. Based on the experiment results, the characteristics of the 3rd SA effect are analyzed and a constitutive model is developed to describe the plastic behavior of the Q235B steel. The model accounts for the 3rd SA effect and …