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Online since: October 2010
Authors: Yuan Xu, Ru Heng Wang, Hua Chuan Yao
In order to study the physical and mechanical properties of recycled coarse aggregate, the grain diameter of the three kinds of tested recycled concrete were 5~20mm 、5~31.5mm、 5~40mm.
Then, the directly or indirectly affect of the different grain diameter on recycled concrete strength was measured.
Meanwhile, each group using fly ash and extra water modified recycled concrete, improving its interface transition zone and its mechanical properties and durability, making it meets its technology, environmental requirements and reducing the cost, making it develops to high-strength and high performance diretion.
Recycled concrete compressive strength is the main reason of the reducing regeneration and slurry between aggregate and in some regions with weaker.Microscopically speaking, the influence factors of recycled concrete strength is due to the existence of old cement slurry, new cement mortar can not with the original coarse aggregate better together, namely recycled coarse aggregate itself by the strength greatly weakened
Properties of Recycled Coarse Aggregate and Its Influence on Recycled Concrete[J].
Online since: July 2015
Authors: Abdul Adam Abdullah, Mohd Herzwan Hamzah, Agung Sudrajat, Nur Atiqah Ramlan, Nur Fauziah Jaharudin
Experiment that conducted by Panda [4] concluded that pyrolysis can be performed with or without catalyst where the catalyst affect the yield rate of the liquid fuel.
The chemical properties for diesel, TDF and WPDF used in the experiment are shown in Table 2.
Table 1: Engine specification Table 2: Chemical properties of test fuels Properties Diesel WPDF TDF Density [g/cm3] 0.841 0.771 0.923 Cetane Number 55 51[6] 42[8] Kinematic Viscosity @ 40 0C [cst] 3.05 2.149 5.1 Flash Point [°C] 84 72 44 Gross cal.
This factor make WPDF has comparable ignition delay compared to diesel fuel even though it has lower cetane number compared to diesel fuel.
This factor cause lower peak pressure when WPDF is combusted.
Online since: October 2018
Authors: Antti Järvenpää, Kari Mäntyjärvi, Markku Keskitalo, Mikko Hietala, Aappo Mustakangas, Tero Jokelainen
Laser welding can be utilized to decrease the production costs (high velocity, one side welding, etc), but also to optimize the panel properties due to low heat input in laser welding.
Mechanical properties of the test materials are shown in Table 1 and the flow curves in Fig. 3.
Tensile properties for the test materials [Data taken from ref. 10].
Plastic properties were taken into account by utilizing the tensile test results (Fig. 3.).
Sandwich panels with different structural dimensions were tested to determine the role of the panel properties on buckling resistance.
Online since: May 2013
Authors: Sean K. Powell, Suzanne M. Mithieux, Anthony S. Weiss, Konstantin I. Momot
Discussion MR properties of water in hydrated biomaterials and tissues can be approximated by the model involving dynamic equilibrium between two distinct pools, “free” and “bound” water [5,6].
Water in the free pool has molecular hydrodynamic properties similar to those of bulk water and possesses a rotational correlation time ~10 ps.
The two-site exchange model shows that the water-proton spin relaxation rates are determined by several factors.
It may be that the intrinsic bound relaxation rates, R1B and R2B, are themselves affected by compression.
By distinguishing between these two models, mMRI would provide valuable insights into the macromolecular basis of the biomechanical properties of elastin networks.
Online since: June 2010
Authors: E. Ahmad, T. Manzoor, M. Sarwar
Duplex stainless steels have become renowned for its excellent properties such as, high strength, toughness and resistance to corrosion [3].
These steels are widely used in petroleum, petrochemical industry due to its good properties, which make them economically competitive with other types of stainless steels and carbon steels in offshore, oil and gas industry.
The controlling factor for cracking of DSS is ferrite phase yielding since ferrite is harder than the austenite phase.
Hydrogen may affect the critical tensile stress σf for crack propagation.
Devine, "Influence of Microstructure on the Mechanical Properties and Localized Corrosion of Duplex Steel in ASTM-5, PP 672, ASTM, Philadephia
Online since: April 2005
Authors: Michael B. Korzenski, D.D. Bernhard, T.H. Baum, Takeshi Hattori, Koichiro Saga, Hitoshi Kuniyasu
This phenomenon, called stiction, is a common problem in the manufacturing of micro electro mechanical systems (MEMS) devices.
In addition, conventional aqueous chemistries tend to alter the sensitive low-k interlayer dielectric properties during post-etch or post-ash photoresist residue removal because these materials are organic or porous polymer materials.
It should be noted that the important factor to consider is the etch rate rather than the amount of substrate to etch to obtain these same PRE values.
This may be a result of three factors, specifically, chemical identity, solution density, chemical additive solubility, and Si and SiO2 etch rates.
Our experiments demonstrate that optimum chemicals, their molar ratios, and specific process conditions can profoundly affect the PRE.
Online since: August 2014
Authors: T.X. Yu, Yan Fei Xiang, Min Wang, Li Ming Yang
The KPIs have five factors: Effective stroke ratio (ESR), Non-dimensional Load-carrying capacity (NLC), Effectiveness of energy absorption (EEA), Specific energy absorption capacity (SEA), Stableness of load-carrying capacity (SLC).
Many factors may affect the energy absorption behavior of tubular structures made from different materials or different configurations.
The solidity ratio (φ) is a dimensionless parameter indicating the geometric property of tubes of different configurations.
Slsobky, Further experimental investigation on the eccentricity factor in the progressive crushing of tubes.
Jones, Energy-absorbing effectiveness factor, Int.
Online since: November 2011
Authors: Jie Zhu, Xin Cai, Pan Pan, Rong Rong Gu
Introduction As one of the most important parts of the wind turbine generator, a good structural design of wind turbine blade is the deciding factor to guarantee the whole generator operates normally.
The maximum stress of the spar cap is far less than 648.7MPa, which is the allowed stress of the glass fiber composites, it shows that the blade lay-up design did not make full use of the mechanical properties of the composites.
The maximum stress of 90MPa which occurs on the spar cap close to the root is far less than the allowed stress of the glass fiber composites, this indicates that the blade lay-up design did not make full use of the mechanical properties of the composites.
(3) The flapwise and edgewise play a main role in the blade vibration while the torsion affects little.
Online since: June 2013
Authors: Sebastian Skoczypiec, Dominik Wyszyński, Piotr Lipiec
The last one is more and more often applied because of unusual and unique properties of the laser beam [2].
These properties enable performing precise operations on difficult to cut materials in low cost and time consuming way.
Realization of these task is strongly related to knowledge about the properties of laser radiation and material physical and chemical characterization.
The extent of these effects primarily depends on the characteristic of laser beam and the thermo-physical properties of the material.
Vertical step C is dependent on laser power, pulse frequency, cutting speed (shape) and material properties.
Online since: July 2019
Authors: Jiří Svoboda, Petr Dymáček, Luděk Stratil, Vít Horník, Bohuslav Mašek, Denisa Bártková
New Generation of ODS Alloys Petr Dymáček1,a*, Denisa Bártková1,2,b, Vít Horník1,2,c, Luděk Stratil1,d, Bohuslav Mašek3,e and Jiří Svoboda1,f 1Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic 2Brno University of Technology, Faculty of Mechanical Engineering, Technická 2, 616 69 Brno, Czech Republic 3COMTES FHT a.s.
A processing route of the ODS steels involves two steps: (i) the nano-composite powder containing matrix and yttria grains is produced by mechanical alloying (MA) and (ii) the powder is then hot consolidated.
The main disadvantage is the low creep fracture strain which represents a limiting factor for use in practice.
The results show that the grain-growing process in the new ODS alloys is significantly affected by the thermomechanical treatment, leading to the maximum grain size within 20-h annealing at 1200 °C.
The mechanical properties reported here are at room temperature and at 800 °C at low strain rates as a part of the ongoing alloy optimization process.
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