Showing papers by "Harbin Institute of Technology published in 1982"
TL;DR: In this article, a universal method for calculation of the inlet length and correction coefficient for the pressure losses and the flow in the case of laminar and turbulent flow in a smooth round pipe is put forward.
Abstract: In this paper, a universal method for calculation of the inlet length and correction coefficient for the pressure losses and the flow in the case of laminar and turbulent flow in a smooth round pipe is put forward.
51 citations
33 citations
TL;DR: In this article, the transient response of a square-law gates sampling oscillographic system excited by a step-like pulse with overshoot is quantitatively analyzed. But the authors do not consider the relationship between the system response overshoot δ and the input pulse overshoot where m is a constant.
Abstract: The transient response of a square-law gates sampling oscillographic system excited by a step-like pulse with overshoot is quantitatively analyzed. The square-law gate is driven by a symmetrical hyperbolic cosine pulse of the form B[cosh(1)-cosh(2t/τ)] in the interval (-τ/2)≤t≤(τ/2) and zero for all other times. The response equivalent time transient function, h(t), and overshoot δ, are derived. For engineering applications it can be shown that the relationship between the system response overshoot δ and the input pulse overshoot δ is δ≅mδ3 where m is a constant.
2 citations
01 Jan 1982
TL;DR: In this paper, the tensile strength of an Al − 4.42%Cu −0.27%Mg − 0.46%Mn alloy, including solutioning, cold drawing and aging procedures, was studied.
Abstract: Thermomechanical treatment of an Al − 4.42%Cu −0.27%Mg − 0.46%Mn alloy, including solutioning, cold drawing and aging procedures, was studied. Experiments indicate that this treatment can increase considerably the tensile strength which may be evaluated by a regressive equation. Emphasis was placed on factors of strengthening, especially the strain-induced precipitation and polygonization.
01 Jan 1982
TL;DR: In this article, three variants of thermomechanical treatment have shown appreciable strengthening effects on plain carbon dual-phase (martensite plus ferrite) steels with nearly 0.2%C.
Abstract: Three variants of thermomechanical treatment have shown appreciable strengthening effects on plain carbon dual-phase (martensite plus ferrite) steels with nearly 0.2%C. The mechanism of strengthening and microstructural changes are discussed.
TL;DR: In this article, an internal friction peak which is considered to be due to α' martensite phase in a cold worked 304L stainless steel has been found at 360K at the measurement frequency of about 500Hz.
Abstract: An internal friction peak which is considered to be due to α' martensite phase in a cold worked 304L stainless steel has been found at 360K at the measurement frequency of about 500Hz by the present authors. This peak is different from the peaks which have been reported by Baraz et al. and Mezzetti et al. in cold worked 18-8 stainless steels. The present work has revealed that the 360K peak height increases with the concentration of solute carbon and nitrogen atoms. The β value, which is discussed in Nowick et al's papers is larger than 2.5 for the 360K peak. Accordingly, this peak is not a single relaxation peak such as a Snoek peak of solute carbon atom. The 360K peak is considered to be a cold work peak which is caused by the interaction between high density dislocations and solute carbon and nitrogen atoms in martensite phase.