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Online since: July 2017
Authors: Stefania Imperatore, Barbara Ferracuti, Silvia Colonna, Maria Zucconi
The structure, a school in Teramo, was already affected by previously seismic damages and it has been highly involved by the seismic events abovementioned.
To evaluate the Conventional Strength at a floor level, a mechanical model based on the shear pier behavior described by Turnsek and Cacovic model is proposed in GNDT methodology.
In absence of specific information about the shear strength, the estimated elastic modulus was used to verify the range of variability of masonry mechanical properties proposed by the Italian Building Code for the clay-brick-masonry.
It is worth to note that this value doesn't account the effective level of damage observed in piers, which could affect their shear strength.
By the mechanical model with the abovementioned parameters, the Conventional Strength is evaluated as 0.212 g.
Online since: September 2020
Authors: Svitlana Chepurna, Tetiana Zhydkova, Olha Popova
Improvement of physical-mechanical properties and decorative features of such concretes is achieved due to the introduction of additives which have a different nature of influence.
Adsorption of the amorphous form of silica on the surface of the carbonate particles of the chalk leads to surface recharging, which explains the difference of the electro-surface properties of the fine chalk from other carbonate materials.
Given that particles of fine chalk can form additional centers of crystallization, accordingly, there is a change in the quantitative ratio of structure-forming and destructive factors during the synthesis of strength of cement stone and concrete.
In this case, the complex compounds, the formed hydrocarbonates, contribute to the increase of water resistance, frost resistance, sulfate resistance of concrete and, accordingly, leads to improvement of decorative properties.
Based on the above, it was assumed that the addition of highly dispersed organogenic calcite (chalk) to the composition of the calcium is the formation of calcium hydrocarbons and low-basic calcium silicates, which improves the physical and mechanical properties and decorative concrete.
Online since: May 2014
Authors: Ernst Kozeschnik, M.R. Ahmadi, L. Whitmore, E. Povoden-Karadeniz, M. Stockinger, A. Falahati
The calculated final yield strength evolution is consistent with experimental results. 1 Introduction Engine performance in aerospace and power generation improves with increasing operation temperature, thus emphasizing the importance of understanding materials with good mechanical properties at high temperatures.
Inconel 718 is a nickel based superalloy, which is widely used in aerospace and gas turbine engine applications because of superior high temperature mechanical properties [2] up to 650°C.
A general approximation for superposition of different weak or strong strengthening mechanisms i was proposed by Ardell [10] to calculate the yield strength increase due to the different strengthening mechanisms with , (7) where M is the Taylor factor for converting shear stress to yield strength (M ~ 2.6) [14]. 4 Results and discussion The formation of γ' precipitates during aging produces the major effect on the final yield strength in 718Plus.
Chaturvedi, Effect of heat input on heat affected zone cracking in laser welded ATI Allvac 718Plus superalloy, Mater.
Online since: October 2010
Authors: Y. Zhang, Rong Di Han, Hui Wang, Q.W. Yao
But there are still some problems about dry cutting Nickel-based superalloy, one of them is the high temperature in cutting zone which negatively affects tool life.
Chemical composition of the material is given in Table 2 and the physical and mechanical properties of GH4169 are shown in Table 3, respectively.
Table 2 Chemical components of the materials used(Wt)% Ni Cr Nb Mo Ti C Al Si Mn 51.75 17.00 5.11 2.93 1.04 0.042 0.41 0.21 0.03 Table 3 Physical and mechanical properties of the materials used Yield strength σs(MPa) Tensile strength σb (MPa) Elongation δ(%) Cross-section contraction ratio φ(%) Hardness HBS 1260 1430 24 40 390 Experimental system.
The cutting experimental study was proposed in single-factor method in turning of C45 steel The cutting force is measured by Kislter 9257A dynamometer and Charge Amplifier 5007.
Online since: February 2018
Authors: Raffaele Landolfo
As a result, different seismic design methods have been proposed, mainly focused on the definition of behaviour / seismic force modification factors and capacity design rules [56,60,66–69].
In addition, also specific activities for the experimental evaluation of mechanical properties of cladding boards [84] and connections [85] were carried out.
The project was devoted to the development and demonstration of enhanced prefabricated lightweight CFS skeleton/dry wall constructions with improved thermal, seismic and fire performance, resulting from the inherent thermal, antiseismic and fire spread prevention properties.
Rogers, Development of seismic force modification factors for cold-formed steel strap braced walls, Can.
Manfredi, Mechanical Properties of Plasterboards: Experimental Tests and Statistical Analysis, J.
Online since: February 2014
Authors: Rui He Wang, Hong Jian Ni, Peng Wang, Zhi Na Li
Based on this idea, and combining classic solid mechanical stress-strain curves, Dahl described the asperity offset using the following differential equation [4] (2) where, represents Coulomb friction, N; is the shape parameters of stress-strain curve, in general, for brittle material and for soft plastic material, conventionally ; represents the relative sliding velocity between two surfaces, .
The force-displacement relationship for an individual asperity of borehole rock can be expressed as[5] (5) where, represents coefficient of friction,dimensionless; represents normal load, N; is composite shear modulus, , and are respectively shear modulus of ,drill-string and borehole rock, Mpa; , constant factor, .
Common parameters include [8,9]: vibration parameters(frequency , amplitude is ), velocity parameters(,,), material property parameters (, , , , ), surface parameters of borehole rock (,,,), friction coefficient , ,, tangential load .
Modeling the affect of a down-hole Vibrator, R.
[4] Dahl, P.R., Solid friction damping of mechanical vibrations, C.
Online since: September 2013
Authors: Shamina Akter, Deok Jin Lee, Shin Taek Lim, Kil To Chong
Korea. 2 Department of Mechanical and Automotive Engineering, Kunsan National University, Kunsan City, R.O.
The parallel processing properties of CNN makes the proposed method robust for real time application.
If the cells are not directly connected together, it may affect each other indirectly due to the propagation effects of the continuous-time dynamics of CNNs.
Dilation procedure: The size of obstacles in the image can be affected after EROSION so that DILATION [12] templates described by Eq. (5) is used.
The attractive potential field is shown in Fig. 3 with starting point (35,18), goal point (130,175) and scaling factor k=0.5.
Online since: September 2011
Authors: Si Ping Lu, Ming Jian Zhao
During the bridge services, due to long-term loading effects, fatigue effects and material aging, natural disasters, environmental erosion, and traffic accidents and other factors make prestress fall, affect the safety of bridge structures and durability, and further bring to bridge potential safety hazards[2].
Therefore, the prestress is one of the most important security factors for prestressed bridges.
As the effects of various factors on the structure have uncertainty, the loss of prestress can also calculated by probability analysis method [3].
Table 6 Measured material properties of the prestressed steel wires Items Elastic modulus Maximum tensile stress Tensile strength Yield stress Yield strength Numeric 199GPa 31.933KN 1630MPa 31.59KN 1610MPa Table 7 Measured values of the prestressed steel strands Testing points Design tension stress[MPa] Strain values[] Stress[MPa] 246-1 1200 2330 463.67 246-2 1200 1987 395.41 919-1 1200 2543 506.06 919-2 1200 197 (Strain gauge teared) —— 1092-1 1200 2136 425.06 1092-2 1200 1977 393.42 According to the calculation and analysis, the selected prestressed high strength steel wires cannot reach the design requirement after windowing and damage testing.
Evaluation of prestressed reinforcement corrosion and mechanical properties of the degree of attenuation.
Online since: August 2014
Authors: W.Y. Ip, Angela W.H. Ho
The focus of recent studies are on different types of material, and also the structural properties of the conduits.
Fillers can be grouped into three categories: neruotrophic factors, protein cues and anisotropy.
Is has tailored mechanical properties and degradation profiles engineered to be complementary to those of the regenerating nerve.
Others are synthetic polymers, which are less biocompatible relative to biopolymers, but has tailored degradation, and control of mechanical strength, porosity, and microstructure properties.
Properties of CUPE nerve guidance conduits In the current study, CUPE fit some of the criteria of ideal conduit
Online since: January 2013
Authors: Si Ming Xing, Zhi Yong Luo
The original manual testing is not only greatly increase the intensity of this work, but also affect the response time and processing speed of fault.
The mechanical body of this robot system is composed by the motion mechanism in directions of X-axis and Y-axis and the actuator in direction of Z-axis.
The mechanical body of the test robot system is shown in Figure 1. 1.robot control box 2.
This differential operator of edge detection is simple and with directivity property.
In this paper, series method is used to calibrate the relationship of above three factors
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