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中文核心期刊

1966 Vol. 9, No. 2

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1966, 9(2): 85-94. doi: 10.6052/0459-1879-1966-2-19660201
1966, 9(2): 95-98. doi: 10.6052/0459-1879-1966-2-19660202
1966, 9(2): 96-116. doi: 10.6052/0459-1879-1966-2-19660203
1966, 9(2): 117-118. doi: 10.6052/0459-1879-1966-2-19960204
1966, 9(2): 119-120. doi: 10.6052/0459-1879-1966-2-19960205
ИССЛЕДОВАНИЯ ХАРАКТЕРИСТИКИ ОЛТИУЕСКИ АКТИВНЫХ ЛРОЗРАУНЫХ МАТЕРИАЛОВ ТИЛОМ ЗЛОКСИДНОЙ СМАЛЫ ЛРОЗРАУНЫХ МАТЕРИАЛОВ ТИЛОМ ЗЛОКСИДНОЙ СМАЛЫ
Фу Син-мин, Фан Ен-лго, Ван Го-лзнъ, Ма Уэнь и Ли Во-цинь
В настоящей статце кратко обобщены результы характеристики оптически активных прозрачных материалов,иепытанных нами с 1961 года в лаборатории оптическополяризационных измерений прн Научно-исследовательском инситуте водного хозяйства и гидроэнергетики.В данной работе разработаны:1)Основная характеристика оптичеки актнвных материалов;2)Анализ причин начальных напряжений в пластинках иблокх,существующих в процессе полимеризации смолы;3)Исследование обливки объемных моделей со сложными формаи;4)Изготовленние оптически активных прозрапных материалов,имсющих различные модуля упругости и способы их склейки.
1966, 9(2): 121-140. doi: 10.6052/0459-1879-1966-2-1966-001
THE CALCULATION OF ROLLING PRESSURE OF BLOOMING MILL BY THE GENERALIZED VARIATIONAL PRINCIPLE OF IIMIT ANALYSIS
武汉钢铁公司钢铁研究所
In applying the generalized variational principle of limit analysis in solid mechanics proposed by Reference [5], a simple formula (28) of rolling pressure of blooming mill is derived far practical use in rolling engineering.Comparison with the experimental data obtained in this country shows that the agreement seems to be quite satisfactory, the resuits being more accurate than those from many foreign formulas, and the calculation very straightfotward.
1966, 9(2): 141-149. doi: 10.6052/0459-1879-1966-2-1966-002
EFFECT OF TRANSVERSE CURVATURE ON AXISYMMETRIC COMPRESSIBLE LAMINAR BOUNDARY LAYER
北京大学
The thickness of the boundary layer over an axisymmetric slender body may be comparable to, or even of several times the local radius of the transverse curvature of the body. The practice of replacing distance of a point in the boundary layer from the axis by the local body radius, as in classical Prandtl boundary layer equatiions,is then no longer applicable.The present work discusses the effcet of the transverse curvature on the axisymmetric compressiboe laminar boundary layer flow,analogous to the work of Lighthill and Glauert for the incompressible case.The first part of the paper deals with the strong effect region, i.e., the region where the boundary layer thickness is much larger than the local body radius.The usual assumptions of perfect gas, Prandtl number equal to one and linear viscosity-temperature relation are made.Neglecting the pressure gradient,one may find a small parameter ε to characterize the transverse curvature effect.The reduced stream function is then expressed as a power series of ε and the asymptotic solutions for skin friction and heat transfer rate are found.It is shown that the singularity of the second approximation(the third term in series)near the wall may be removed by using the PLK method and the solution is then uniformly valid.For power-lawed bodies,rw~xn,the skin friction coefficient Cf and the Stanton number St in the strong effect region may be expressed as Cf=4Ce/Rex Tw/Te x/rw cosφ{θ+[0.577-In(1+2n)]θ2}+O(θ3,St=1/2Cf In the second part, the transverse curvature effect in the entire flow field is investigated by means of momentum integral method where the Crocco's independent variables x,μ are used.With a suitable choice of a relation between shearing stress τ and velocity μ,approximate solutions for Cf and St of the circular cylinder and circular cone, valid for the entire range of transverse curvature paameters Ω and Φ,are found Coparison of the results with the Probstein and Elliott's serics solution for the weak effect region and the solution for the strong effect region found in the first part is made.
1966, 9(2): 150-172. doi: 10.6052/0459-1879-1966-2-1966-003
1966, 9(2): 173-174. doi: 10.6052/0459-1879-1966-2-1966-004