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Online since: December 2010
Authors: Ling Ling Zhang, Qing Sun, Ling Zhang
Xenon lamp aging affects the material properties of the specimens with protective coatings more slightly than those without any protective coatings.
High temperature environment affects the material properties of specimens more obviously than low temperature environment does.
Preface Pole and Tower are important support structures in the transmission and other infrastructure, whose structural properties directly affect the safety, economy and reliability of the transmission lines.
All these are important factors which restrict the application of FRP Pole and Tower.
In order to compare, the mechanical properties of eight specimens without any aging treatment (the group number is JB) are tested specifically.
Online since: August 2012
Authors: Yong Yao, Bin Jia, Chao Wu Pei, Jiu Li Zhang, Dai Guo Chen, Li Jun He
The Interfacial transition zone is the weak links of concrete, it is a non-uniform system, and it can present the Macro-mechanical properties of concrete to a huge degree.
The decrease of the tensile strength in interfacial transition zone of concrete could due to these factors.
Supported By NSAF(Grant NO.11076023)2011.1-2013.12 References [1] MINDESS S, Tests to Determined the Mechanical Properties of the Interfacial Zone [A].In: MASO J C ed.
Summary of Mechanical Properties of Concrete Aggregate-paste Interfaial Transition Zone[J].Technology of Water Resours. 28(2)(2008)89-94
Standard Test Methods for the Mechanical Properties of Ordinary Concrete ,S.2003
Online since: March 2008
Authors: Igor S. Golovin, Werner Riehemann, Agnieszka Mielczarek, Olga A. Sokolova
Introduction Fe - Al alloys are characterized by good mechanic, magnetic and dissipative properties.
The mechanical properties of these alloys are reported in refs. [2 - 4].
If HC0 is the coercivity of the single crystal and C is a constant [8, 10 and 20], equation (8) holds: d C HH cc += 0 (8) Additional factors like dislocation density and internal stresses, affect the coercivity of the alloys, as well.
These factors prevail in case of cold rolled specimen.
Moreover other unknown micro-structural factors like small precipitates and ordered domains in the order of domain wall thickness increase the coercivity.
Online since: January 2014
Authors: Hsi Harng Yang, Mu Hung Chen, Tung Hsu Hou, Wang Lin Liu
Many academic institutions have been actively involved in the study of optical thin films by developing new surface nanostructure technologies to create nanofilms with low surface energy, high mechanical strength, high adhesive properties; or anti-reflection, self-cleaning, dirt-repelling, or anti-bacterial properties.
In this study, the five key factors affecting ultrasonic SiO2 solution spraying are as follows: (A) movement speed, which affects the amount of spray solution deposited on the substrate–a faster axis movement results in faster deposition and less solution on the substrate; (B) flow rate of solution, which affects the amount of ultrasonic fog and indirectly affects the film thickness; (C) airflow strength, which affects the spraying coverage; (D) nozzle height, which affects the density of the film; and (E) spray gap, which affects the uniformity of the surface coating at areas of overlap.
The thin film formed by ultrasonic spraying is correlated with the five control factors listed above.
Because there are five factors and each factor has five levels, there are 20 degrees of freedom in total.
As all five control factors except for factor C have significant effects, but the F value of factor C is close to the significant value, all five factors are taken into account in the prediction.
Online since: September 2013
Authors: Dong Xiang Chen, Fu Xun Lin, Ruo Yu Liang, Xiao Feng Xu, Yi Chao Li, Kai Fa Wu, Taiyong Wang
The main part of the chassis is made of aluminum alloy 5052, this label material has good forming properties, corrosion resistance, blanch resistance, fatigue strength and the medium static strength.
The mains should be the IPC dedicated power, this type has good electromagnetic properties and mounting dimensions.
There’re several factors affect the performance of the gap shield, such as the maximum size of the gap, the depth of the gap, the characteristic of the shielding materials, etc.
The maximum size of the hole and the depth of the hole are the major factors affecting its shielding effectiveness, so when the shielding effectiveness of the ventilation holes and heating contradiction, increase the depth, reduce the diameter of the hole and increase the density and number of the holes can solve the problem.
Other Protective Design Hot flashes, salt spray and mold, these three environmental factors also affect electronic components, the technical precautions for them are called defense technology.
Online since: November 2016
Authors: Kang Yang, Dmitrii Chernikov, Rija Nirina Raoelison, Vladimir Gluschenkov, Nicolas Buiron, Mohamed Rachik, Thaneshan Sapanathan
Minimizing the heating effect by identifying the influencing factors could help to optimize and control the quality of the magnetic pulse welded parts.
The onset criterion for the temperature increase and the occurrence of in situ melting has also been predicted experimentally and analytically using a viscous dissipation function in relation with impact conditions and material properties [12].
Electromagnetic, mechanical and thermal properties of the materials used for the individual parts are given in Table 1.
Mechanical, thermal and EM properties of materials used in this model for individual parts Material Part Density(kg/m3) Young’s modulus (GPa) Poison ratio Electrical conductivity (S/m) Specific heat capacity (J/kg.K) Thermal conductivity (W/m.K) AA2024 – T351 Tube and Rod 2700 73 0.33 1.74 × 107 795 143 Copper alloy Fieldshaper 7900 210 0.29 2.66 × 107 486 36 Steel Coil Rigid 4.06 × 106 486 36 Table 2.
However, the shock front travels with an estimate speed of ~1390 m/s, which indicate the time duration affecting the metal due to the gaseous compression is very short, that may result the heating to be experienced only by ~100µm of the interface region.
Online since: November 2021
Authors: Reem Sabouni, Samer Al Martini, Abdel Rahman Magdy El-Sheikh
However, these properties need to be verified under hot weather conditions.
SCC has also good mechanical properties and strength that made it suitable to be used for both in situ and precast concrete construction.
Slump of concrete is affected by seveal factors including: the method and duration of transportation, quantity and characteristics of cementitious materials, grading shape and surface texture of fine and coarse aggregates, entrained air, water content, concrete and ambient air temperatures, admixtures.
The paper investigates the effect of admixture dosage on fresh, mechanical properties and durability of SCC under hot weather.
This test includes some factors, such as temperature, dosage of superplasticizer.
Online since: June 2012
Authors: Xiao Zheng Xie, Yun Ping Yao, Rong Zhen Zhao, Wu Yin Jin
China ax2zdavy@126.com Key words: high-speed milling, Stainless Steel, cutting force, prediction Abstract: According to the components, mechanical properties of difficult-to-process material (26NiCrMoV145)as well as characteristics of high-speed machining, modelling and prediction of cutting force in high-speed milling is studied.
The method of poor prediction in more varied cutting factors and bad cutting situation.
In future studied, more milling force affecting factors should be considered to improve the milling force model.
Zhang, China Mechanical Engineering, Vol.9(1998) No.2, pp.41-44
[10] Yan Bin, Xu Anping, China Mechanical Engineering, Vol.13(2002) No.2, pp. 160-163.
Online since: July 2017
Authors: Tim Foecke, Matthias Merzkirch, Louise Ahure Powell
Numerical models based on cohesive zones are usually used to model and simulate the mechanical behavior of laminated carbon fiber reinforced polymers (CFRP) in automotive and aerospace applications and require different interlaminar properties.
Additionally, the current work offers a detailed insight into the constraints and assumptions to allow exploration of different methods for the determination of material properties using the DIC measured data.
The mechanical interlaminar properties are affected by the volume fraction, the architecture and orientation of the single constituents [1], as well as parameters of the production process.
These models have inputs for different interlaminar properties, including energy, stress and displacement related parameters, to be determined under Mode I, Mode II and mixed Mode loading conditions.
Ye., Consolidation and interlaminar fracture properties of unidirectional commingled CF/PEEK composites, J.
Online since: May 2011
Authors: Zhi Wu Yu, Li Song
The effects of reinforcement corrosion on fatigue behavior of the strengthening beam can be attributed to a combination of four factors, including deteriorated bond behavior between reinforcement bras and surrounding concrete, loss of effective cross-section area of reinforcement, the stress concentration on steel bars, and degradation of mechanical properties of steel bars.
Fig.1 Typical dimensions and reinforcement details of test specimens (unit: mm) Material properties.
The effects of reinforcement corrosion on fatigue behavior of the strengthening beam can be attributed to a combination of four factors, including deteriorated bond behavior between reinforcement bras and surrounding concrete results from rust deposition in their interface zone, loss of effective cross-section area of reinforcement, the stress concentration on steel bars due to corrosion pit, and degradation of mechanical properties of steel bars.
As corrosion progress, however, further corrosion significantly affected the fatigue life.
The effects of reinforcement corrosion on fatigue behavior of the strengthening beam can be attributed to a combination of four factors, including deteriorated bond behavior between reinforcement bras and surrounding concrete, loss of effective cross-section area of reinforcement, the stress concentration on steel bars, and degradation of mechanical properties of steel bars. 2.
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