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Online since: January 2010
Authors: Kei Shinozuka, Hisao Esaka, M. Tamura, Hiroyasu Tanigawa
Accordingly, although dynamic recovery occurred in the ODS steel, it had not affected the creep deformation rate.
Oxide dispersion strengthened (ODS) steels are promising candidate for high temperature materials of a nuclear fusion reactor because of excellent mechanical properties.
Although ferritic ODS steels are excellent in creep properties compared with martensitic ODS steels, the anisotropy of the mechanical properties in correlation with rolling or extrusion is large.
However, since the decrease in dislocation density is the main factor of dynamic recovery in usual martensitic heat resistant steel, detailed analysis of the dislocation density during creep deformation is required.
Consequently, dynamic recovery did not affect the creep deformation rate, though it did occur during creep test.
Online since: December 2014
Authors: Jarosław Chmiel, Roman Jędrzejewski, Arkadiusz Rzeczycki, Jolanta Baranowska
Example of pressure changes caused by implosion on the surface of a pressure pickup [2] The role of stresses in the process of hydrogen absorption and diffusion in metals and the influence of adsorbed hydrogen on mechanical properties of metals has been discussed in many publications [3-12].
The method used allows to observe that when a material is affected by cavitation, the states of stress vary and depend on depth.
Numerical models indicate that essentially changed properties can be found in an area of extreme parts of microvolumes affected by a microjet or shock waves generated by cavitation.
Migration of positive charges affected by implosion of a cavitation bubble [20] Fig. 9.
At the macroscopic level the deciding factor is a change in hydrogen concentration close to the crack bottom [24].
Online since: February 2012
Authors: Wei Da Li, Hai Yan Hu, Man Tian Li, Juan Li, Li Ning Sun
The main body is a circuit board, which simultaneously fulfills mechanical connect and electric connect.
Due to symmetrical layout of three flexible legs and their consistent drive signal, tensional vibration of the legs will not affect movement of the robot.
Therefore, first order and second order vibration mode are main factors affecting the vibration of the structure.
Assume (4) Combing with equation (3),the solution of equation (2) can be solved as (5) To make static properties of double pendulum model same with actual structure, following complemental condition is added (Fig.3): double pendulum model and the sub-structure have the same equivalent stiffness, which is the same displacement d will be produced when the same force F is applied at the end.
According to small deformation theory for the sheet, and combining structure characteristics of piezoelectric bimorph, following basic hypothesis is proposed: (i) The bonding between piezoelectric substrate and metal substrate is strong enough, which allow ignoring the effect of adhesive on mechanical properties of dual piezoelectric film.
Online since: October 2016
Authors: Prihartini Widiyanti
(b) connection between column Ca(I) with column Ca (II) through a cluster of tetrahedral PO4 [5] The physical, chemical, and biological properties of HA are similar to its bone.
Structure polimannuronat, poliguluronat, dan copolimer [6] Three main properties of alginate were soluble water which could increase solution viscosity, formed gel, and formed film and fiber.
Compressive Strength Test Result The mechanical properties of bone graft is one of the parameters in the bone graft to be considered for tissue engineering applications.
Bone graft must have good mechanical properties.
The addition of compaction force on each sample also affect the value of its compressive strength, where the greater value of compaction is done, the greater mechanical strength value of the composite material were produced.
Online since: September 2013
Authors: Tomaž Pazlar
The choice of the levels of reliability for a particular structure should take into account of several relevant factors including aspects of design working life, durability and quality assurance.
The approach of structural reliability is based on the semi-probabilistic method: limit-state performance design and partial factors method.
Summer storm on 23rd of August affected the northern part of the Ljubljana basin, Styria and some parts in east Slovenia.
We were not successful at obtaining information form the insurance companies, since they required written authorization letters form the property owners.
After taking into account the key factors – the characteristics of the atmosphere, facility location, terrain, height of buildings, etc. – the reference wind pressure as calculation load on structure can be calculated.
Online since: February 2012
Authors: Hao Lu, Yi Min Xia, Zhao Wang, Zhi Jin Zhou, Ze Jun Wen
Mining pipeline’s vibration can cause the pipeline leak, burst, fatigue damage, etc., which will affect the stability and reliability of pipeline systems, deteriorate working conditions and undermine system security, and even cause serious accidents and property damage [2].
For the pipeline to the lifting nodules, such as a special study of small vertical cantilever pipe vibration, it ignores the factors of the pipeline’s fluid impact, but we consider the frequency of the structure of the pipeline itself, or consider only the tube fluid and the pipe coupling.
Natural frequencies have been obtained under three conditions that stand for three coupling (internal fluid-pipe-outer fluid), two coupling and no coupling between fluid and pipe, then discuss relate difference on natural frequencies of lifting pipeline because various factors of transportation parameters and solid coupling effect result in.
At the same time, impact factor of natural frequencies in the same order also reduced, namely the greater the concentration of internal fluid of pipeline is, the more obvious difference of natural frequencies of pipeline considering effects on fluid-solid coupling and not considering coupling is; (3) impact factors in the different order are not the same, so that they can not be dealt with simply times.
[4] Han-IR Yoon,In-Soo Son,Sung-Jun Ahn.Free Vibration Analysis of Euler-Bernoulli Beam with Double Cracks [J].Journal of Mechanical Science and Technology, 2007,(21):476-485
Online since: June 2007
Authors: Cong Qi Fang, Mei Ying Yi
In normal weight concrete, the aggregate strength is not a factor affecting concrete strength because the aggregate is much stronger than the matrix and the transition zone.
The concrete mixture and its measured mechanical properties are shown in Tables 1 and 2, respectively.
The mechanical properties of reinforcement are shown in Table 3.
Compressive strength [Mpa] Splitting strength [Mpa] Elastic modulus [Mpa] Dry performance density [kg/m3] 32.1 4.5 1.95×10 4 1744 Table 2 Mechanical property of RLAC.
Mechanical properties of the reinforcing bar.
Online since: September 2013
Authors: Andrei Craifaleanu, Adrian Costache, Nicolaie Orăşanu, Cristian Dragomirescu
The paper studies the vibration transmitted by a mechanical oscillating system to its fixing device.
However, the real constraints are made by means of bodies which are also elastic, so that the studied system (the principal sub-system) is part of a system with supplementary degrees of freedom, whose vibratory behavior is affected by the mechanical characteristics of the fixing device (fixing sub-system).
At the same time, the studied mechanical system transmits vibrations to the fixing device.
The ratio , plotted in Figure 7, tends to become constant for perturbation frequencies lower than 30 Hz, which validates the property found in the previous paragraph.
Graham Kelly, Mechanical Vibrations: Theory and Application, Cengage Learning, USA, 2012.
Online since: February 2024
Authors: Agus Geter Edy Sutjipto, Yuli Panca Asmara, Firda Herlina
Other factors affecting efficiency of inhibitor are temperature, flow rate and water/gas ratio.
The corrosion rate is significantly affected by the shape/flow regime and flow velocity [10,11].
In choosing an inhibitor, factors that must be considered are whether the inhibitor is toxic, the price and availability of the inhibitor and its ability to reduce the rate of corrosion.
They work by forming a protective layer on the metal surface or interfere the electrochemical properties to prevent corrosion process.
PVA, with its crosslinked structure, offers a highly adaptable method for creating and modifying polymers, thereby enhancing properties such as mechanical, thermal, and chemical stability.
Online since: March 2007
Authors: Rudolf Kawalla, Stan T. Mandziej, J.D. Vosburgh, H.G. Schoss
Some alloying elements, which tend to segregate, make the as-solidified dendritic microstructure prone to hot cracking and then require well-controlled cross-reductions during subsequent rolling or thermal-mechanical treatment to homogenize microstructure and get optimum properties.
The effect that an alloy's segregation behavior has on its final properties is the reason why semi-solid and post solidification hot rolling processing conditions are an important subject of R&D for innovation and refinement of industrial processes.
In all three cases, the casting process is followed by a hot deformation step, in particular hot rolling, to control the necessary geometrical, mechanical, technical and physical properties of the flat products.
The austenite grain size influences the hardening and softening behaviour of the slab material, while being simultaneously affected by the solute state of the as-solidified slab and related precipitation kinetics.
The laboratory simulation must take into account the mentioned factors and their influence on the deformation process in compliance with the characteristics of meting / solidification and then time-temperature-deformation cycles of the real process.
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