Search results

It increases with T and decreases with as shown in the following equation (3) where χ is an interaction parameter between 0.1 and 1.0, b is the Burger vector of the slip system α, D is a proportionality factor of unit of stress, g is normalized stress-independent activation energy and k is the gas constant.
In equation (3), the constant k1 affects the dislocation generation during plastic deformation.
This third term affects stage IV.
Mechanical properties of the hot rolled AZ31B Mg alloy under tension and compression.
Experimental (lines) and predicted (symbols) mechanical response under tension and compression of the as-received hot rolled samples.

The characterisation of mechanical properties of the polymer concrete was realised by determining its strength in a temperature range between - 40 °C and 60 °C.
The aspects of the material development, especially the investigation of mechanical properties and durability of the binders and the polymer concretes, are described in this paper.
Specific characteristics such as particle shape, particle size distribution, chemical composition and impurities, as well as the type and form of organic admixtures influence for example the processing properties, the curing characteristics, the mechanical properties and the durability properties of the polymer concrete.
In general an optimized particle size distribution for minimum binder content and good mechanical properties is made for polymer concrete as well as for cement concrete.
For the use of polymer concrete in building constructions, the change of mechanical properties in dependency on the temperature is an important factor.

The biodegradability of this polymer contributes to butylene adiapte part, whereas terephthalate play an important role on stability and mechanical properties [21].
Keller, Temperature dependence of mechanical properties of poly (beta-hydroxybutyrate- beta-hydroxyvalerate), Polym.
Wang, Thermal properties of PHB/PEG blends, J.
Thomas, Blending polylactic acid with polyhydroxybutyrate: the effect on thermal, mechanical, and biodegradation properties, Adv.
Russo, Optical and mechanical properties of UV-weathered biodegradable PHBV/PBAT nanocomposite films containing halloysite nanotubes, AIP Conf.

Numerical analysis on characteristics of heat transfer of pulsating flow around the vibrating tube Qian Liu1, a , Jiuyang Yu1,b, Wei Lin1,2, Lijun Liu1, Wenhao Yang1 , Yiwen Chen1 and Sihao Nie1 1 School of Electrical and Mechanical Engineering, Wuhan Institute of Technology, 693# Xiong Chu Street,Wuhan 430073, Hubei, China 2 School of Mechanical and Electrical Engineering, Wuhan University of Technology , Luoshi road 122, Wuhan 430070, Hubei, China aliuqian19870131@126.com,bjyyu@mail.wit.edu.cn Keywords: Pulsating flow; Vibration; Heat transfer enhancement.
The results showed the combined action of pulsating flow and vibration enhances the coefficient of heat transfer, and the surface heat transfer coefficient of vibrating tube increases with the increment of the tube vibration amplitude, frequency and pulsating flow amplitude, and pulsating flow frequency has less affected.
(a)pulsating flow frequency f=5Hz (b)pulsating flow amplitude A=0.012mm Fig.4 Variation of the instantaneous heat transfer coefficient when the tube under a constant vibration Discussion of heat transfer enhancement factors From Fig.5 ,we can see in a vibration period , the velocity of fluid near the tube have got obvious variation relatively, The whole circulation area still have the vortex fall away, where a is time-phase in a period.
From Fig. 6 we can see for the instantaneous surface heat transfer coefficient vibration has more affect than pulsating flow.
Heat transfer properties of the vibrational tube when fluid passes by it slowly [J].

Fly ash (FA) and granular blast-furnace slag (GBFS) are usual mineral admixtures to conventional concrete, and their contents substituted for Portland cement definitely affect development rate of strength of concrete.
Introduction The strength is the most important property of concrete and influenced by many factors.
The strengths of hardened concrete were tested in compliance with “Standard for test method of mechanical properties on ordinary concrete”(GB/T 50081-2002).
References [1] Abolpour B, et al.: Statistical analysis of the effective factors on the 28 days compressive strength and setting time of the concrete, J Adv Res (2014), http://dx.doi.org/10.1016/j.jare.2014.03.005 [2] M.a.a.
[6] Shan HUANG: Research on Mechanical Properties and Early Prediction of Flay Ash Concrete, Wuhan University of Technology, 2008 (in Chinese).

The non-destructive testing methods are widely used to assess physical and strength properties in the building diagnostics [2].
Progressive changes in the concrete and reinforcement properties can be monitored etc., g.
This testing methods is not just for designating concretes mechanical properties.
De Lorenzo, 2005 [13] presented by in situ non-destructive investigations, the evaluation of the mechanical properties of RC structures.
Vijay Wairagade et al, 2019 [22] carried out a rebound hammer test with the target of predicting on the mechanical properties of the concrete columns used in the college.

(1) where N = axial force; M = bending moment; A = gross sectional area; W1 = section modulus of the edge in bigger compression; NE = Euler critical force; f0.2 = yield limit; η1 = 0.75 for weak hardening alloys, or η1 = 0.9 for strong hardening alloys; γ = plasticity adaptation factor, which is shown in Table 1; φ = stability factor, which is calculate from Eq. 2.
Analytical Method Aluminium alloys possess mechanical properties considerably different from each other, and their constitutive relationship cannot be simplified to perfectly elastic-plastic behaviour which is commonly used for steel.
Zhang [1] found that the in-plane stability capacity of extruded T-section aluminum beam-columns with the edge of the flange in bigger compression are affected by the classes of aluminum alloys largely.
And the analytical results show that the class of aluminium alloys and the kinds of cross-sections do affect the stability capacity obviously.
And the section modulus amplification factor, defined as 1.3, do not consider the class of aluminium alloys as η1 has already do that.

Humidity, as an important factor to measure environmental comfort, affects living and production, and indoor humidity control is an indispensable part of modern architecture.
The indoor environment not only affects the industry but also affects human comfort and then affects the working ambiance.
These properties, as well as extraordinary variability and compatibility with organic and inorganic properties.
According to Fanger[6], human metabolic heat consists of external mechanical work and internal heat demand.
The accurate determination of the convective heat transfer coefficient requires the actual measurement of multiple factors, so we take the intermediate value here 55 W/m2K.

The existence of a temperature difference across a vacuum glazing causes dimensional differences between the hot and cold glass sheets, with associated mechanical stresses and bending.
In order to understand the distribution characteristics of the stresses and deformation in vacuum glazing due to temperature difference, in this work, the mechanical models were established and the calculation formula of the shear stress in the edge seal and bending tensile stress on the surface of the two glass sheets of the vacuum glazing were given.
The objectives of the present work were to study the distribution characteristics of the stresses and deformation in vacuum glazing and its affecting factors due to temperature difference.
Characterization of the Thermal Insulating Properties of Vacuum Glazing.

School of Mechanical Engineering, Liaoning University of Petroleum & Chemical Technology, Liaoning Fushun 113001, PR China. 2.
Introduction Nitrogen-alloyed 316L stainless steel is currently a widely used material because of its good tensile and creep properties and enhanced resistance to intergranular cracking.
The stacking fault energy (SFE) is known to be one of the critical factors which influence the slip character, and thus affects the saturation dislocation structure formed by the cyclic deformation.
Mechanical testing.
In addition, not same as the stacking fault energy, the atomic pairs are not so much affect by temperature, so that the cross slip prohibiting effect will be effective even the temperature is rather high.