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Online since: April 2015
Authors: Yong Xun, Hong Yu Yin, Chen Bin Ji, Shuai Sun
FRP has poor performance in the presence of heat and fire since the mechanical properties of the composite quickly degrade at high temperatures and epoxy resin releases toxic fumes.
Several cylindrical specimens wrapped with different layers of TRC are presented and compared with the response of unconfined specimens of the same size and with the same mechanical properties, accounting for mechanical involved parameters such as the ratio of textile reinforcement, the compressive strength of the concrete, the member cross section.
The identification code and the geometrical properties are summarized in Table 1.
The measured mechanical properties of the textile is list in Table 3.
Xu, Properties and calculation of normal section bearing capacity of RC flexural beam with skin textile reinforcement, J.
Several cylindrical specimens wrapped with different layers of TRC are presented and compared with the response of unconfined specimens of the same size and with the same mechanical properties, accounting for mechanical involved parameters such as the ratio of textile reinforcement, the compressive strength of the concrete, the member cross section.
The identification code and the geometrical properties are summarized in Table 1.
The measured mechanical properties of the textile is list in Table 3.
Xu, Properties and calculation of normal section bearing capacity of RC flexural beam with skin textile reinforcement, J.
Online since: February 2013
Authors: Philippe Bocher, Abderrazak El Ouafi, Abdel Jelil Khelalfa, Noureddine Barka, Jean Brousseau
The developed 2D model includes the coupling between electromagnetic and thermal fields, and takes account of the nonlinear behaviour of material properties versus temperature.
Moreover, the level of compressive residual stresses being produced by temperature gradients and volume change during phase transformation increases significantly the fatigue life of mechanical component.
The model developed by simulation should take into account the influence of machine parameters (such as frequency, current, and heating time), material properties, coil characteristics, and part geometry [3-4].Generally, to treat gear by induction heating process, there are two major concepts.
These currents have an exponential evolution at heating start and due to the dependence of material properties to temperature field, they are spread on more surfaces at the tip region but they are more concentrated to the root region.
The simulation represents a powerful tool to understand how the current are distributed in the gear and how they are affected by the material properties behavior.
Moreover, the level of compressive residual stresses being produced by temperature gradients and volume change during phase transformation increases significantly the fatigue life of mechanical component.
The model developed by simulation should take into account the influence of machine parameters (such as frequency, current, and heating time), material properties, coil characteristics, and part geometry [3-4].Generally, to treat gear by induction heating process, there are two major concepts.
These currents have an exponential evolution at heating start and due to the dependence of material properties to temperature field, they are spread on more surfaces at the tip region but they are more concentrated to the root region.
The simulation represents a powerful tool to understand how the current are distributed in the gear and how they are affected by the material properties behavior.
Online since: June 2014
Authors: Constantin Dogariu, Doru Bardac
Among all the components of a machine tool, the spindle system is the most critical part, since it`s dynamic properties directly affect the machine`s cutting ability.
The huge potential of high-quality ceramic materials is characterized by its excellent wear properties, high operating temperature range, and high resistance towards aggressive media.
Moreover, many important factors will be considered for high-speed spindles, such as rotary inertia and gyroscopic moments.
Tu - Nuggets of Mechanical Engineering – Revisit of the Free-Body Diagram Analysis and Force Flow Concept - International Conference on Engineering Education – ICEE 2007 Coimbra, Portugal September 3 – 7, 2007
[6]- Ṧooṧ L’ - Contribution to the research of static and dynamic properties of CNC turning machine - STROJNỈCKY ĈASOPIS, 59, 2008, no. 5–6, pp. 231-239.
The huge potential of high-quality ceramic materials is characterized by its excellent wear properties, high operating temperature range, and high resistance towards aggressive media.
Moreover, many important factors will be considered for high-speed spindles, such as rotary inertia and gyroscopic moments.
Tu - Nuggets of Mechanical Engineering – Revisit of the Free-Body Diagram Analysis and Force Flow Concept - International Conference on Engineering Education – ICEE 2007 Coimbra, Portugal September 3 – 7, 2007
[6]- Ṧooṧ L’ - Contribution to the research of static and dynamic properties of CNC turning machine - STROJNỈCKY ĈASOPIS, 59, 2008, no. 5–6, pp. 231-239.
Online since: August 2018
Authors: Alena Struhárová, Michaela Kostelecká, Katarína E. Hellová
Potential failures does not affect the structure nor the building statics.
It also may cause wood volume change and subsequently formation of sponge, mould and overall wooden construction degradation All these factors decrease the reliability and functionality of the whole wooden construction.
Acknowledgment This article was created with the support of the Ministry of Education, Science, Research and Sport of the Slovak Republic within the Research and Development Operational Programme for the project "University Science Park of STU Bratislava", ITMS 26240220084, co-funded by the European Regional Development Fund and for the project APVV-15-0681 “Investigation of Hygrothermal and Mechanical Properties Linked to the Consistency and Structure of Porous Building Materials, Based on Mathematical Modeling.”
[6] Hens, H.: Applied Building Physics – Boundary Conditions, Building Performance and Material Properties, Berlin: Ernst & Sohn Verlag, 2010 [7] Glass, S.
L.: Moisture Relations and Physical Properties of Wood, Wisconsin: U.S.
It also may cause wood volume change and subsequently formation of sponge, mould and overall wooden construction degradation All these factors decrease the reliability and functionality of the whole wooden construction.
Acknowledgment This article was created with the support of the Ministry of Education, Science, Research and Sport of the Slovak Republic within the Research and Development Operational Programme for the project "University Science Park of STU Bratislava", ITMS 26240220084, co-funded by the European Regional Development Fund and for the project APVV-15-0681 “Investigation of Hygrothermal and Mechanical Properties Linked to the Consistency and Structure of Porous Building Materials, Based on Mathematical Modeling.”
[6] Hens, H.: Applied Building Physics – Boundary Conditions, Building Performance and Material Properties, Berlin: Ernst & Sohn Verlag, 2010 [7] Glass, S.
L.: Moisture Relations and Physical Properties of Wood, Wisconsin: U.S.
Online since: September 2011
Authors: Xiao Ming Qian, Yue Qing Zhang, Zhi Zhong Ding
As one of the body armor materials, the fiber of the fabric should have high properties of strength, modulus, impact resistance.
The properties of the main fiber types used in personal body armor are summarized in Table 1.
Horsfall et al. [14] developed a mechanical flexibility test which was used to assess multi layer body armor systems.
Yves Termonia [16] developed a model for the study of the factors against needle puncture.
The balance of functionality and comfort directly affects its market promotion.
The properties of the main fiber types used in personal body armor are summarized in Table 1.
Horsfall et al. [14] developed a mechanical flexibility test which was used to assess multi layer body armor systems.
Yves Termonia [16] developed a model for the study of the factors against needle puncture.
The balance of functionality and comfort directly affects its market promotion.
Online since: July 2017
Authors: Horia Octavian Manolea, Alexandru Andrei Iliescu, Irina Maria Gheorghiu, Mihaela Georgiana Iliescu, Gabriel Tulus, Paula Perlea
Properties and clinical applications, Wiley Blackwell, Oxford, 2014, 71-110
Berzins, Chemical properties of MTA, in: M.
Properties and clinical applications, Wiley Blackwell, Oxford, 2014, 17-35
Gettleman, Physical properties of MTA, in: M.
Properties and clinical applications, Wiley Blackwell, Oxford, 2014, 37-70
Berzins, Chemical properties of MTA, in: M.
Properties and clinical applications, Wiley Blackwell, Oxford, 2014, 17-35
Gettleman, Physical properties of MTA, in: M.
Properties and clinical applications, Wiley Blackwell, Oxford, 2014, 37-70
Online since: July 2012
Authors: De Wen Seng
Through appropriate methods, different materials are to be combined with each other sets’ advantages of various materials into one, and to be available to the various properties of new materials.
The development of ceramic matrix composites subject to the constraints of fiber development, fiber plays an important role in the performance of the composites, fiber thermal stability, high strength, high modulus, low density are important factors affect the performance of composite materials [1-3].
Overview of composite materials The composite is a combination of two or more different materials mechanical engineering materials.
The development of ceramic matrix composites subject to the constraints of fiber development, fiber plays an important role in the performance of the composites, fiber thermal stability, high strength, high modulus, low density are important factors affect the performance of composite materials [1-3].
Overview of composite materials The composite is a combination of two or more different materials mechanical engineering materials.
Online since: February 2020
Authors: Erwin Christian Lovasz, Nicuşor Alin Sîrbu, Octavian Victor Oancă, Mircea Vodă, Dan Florin Teusdea
Researches on Manufacturing Deo Roll Balls by Ultrasonic Welding
Dan Florin TEUȘDEA1,a *, Octavian OANCĂ2,b, Mircea VODĂ3,c,
Nicușor -Alin SÎRBU4,d and Erwin Christian LOVASZ5,e
1Politehnica University Timisoara, Faculty of Mechanical Engineering, Department of Mechatronics, Bld.
Mihai Viteazu nr.1, 300222-Timisoara, Romania 2National R&D Institute for Welding and Material Testing –ISIM Timisoara, Romania, 3Politehnica University Timisoara, Faculty of Mechanical Engineering, Department of Mechatronics, Bld.
Mihai Viteazu nr.1, 300222-Timisoara, Romania 4National R&D Institute for Welding and Material Testing –ISIM Timisoara, Romania 5Politehnica University Timisoara, Faculty of Mechanical Engineering, Department of Mechatronics, Bld.
Methodology The numerous applications of ultrasound in various branches of the technique are due to the effects produced by them as a result of the properties that the ultrasonic waves possess: the small wavelength, the very large particle acceleration can reach 109 times the gravitational acceleration, the possibility of directing a narrow ultrasonic beam in the desired direction, the possibility of concentrating and focusing the energy in a limited space without affecting the environment through which it propagates [2,5,13].
Material Sound speed [m/s] Horn Length [Mm] Resonance Frequency kHz Amplification Factor Node of Oscillation coordinate [mm] Disipated Power [Watt] OL45 5334 125 2,0 1,56 65,00 2,0 10-3 The technological parameters of ultrasonic welding are shown in Table 2.
Mihai Viteazu nr.1, 300222-Timisoara, Romania 2National R&D Institute for Welding and Material Testing –ISIM Timisoara, Romania, 3Politehnica University Timisoara, Faculty of Mechanical Engineering, Department of Mechatronics, Bld.
Mihai Viteazu nr.1, 300222-Timisoara, Romania 4National R&D Institute for Welding and Material Testing –ISIM Timisoara, Romania 5Politehnica University Timisoara, Faculty of Mechanical Engineering, Department of Mechatronics, Bld.
Methodology The numerous applications of ultrasound in various branches of the technique are due to the effects produced by them as a result of the properties that the ultrasonic waves possess: the small wavelength, the very large particle acceleration can reach 109 times the gravitational acceleration, the possibility of directing a narrow ultrasonic beam in the desired direction, the possibility of concentrating and focusing the energy in a limited space without affecting the environment through which it propagates [2,5,13].
Material Sound speed [m/s] Horn Length [Mm] Resonance Frequency kHz Amplification Factor Node of Oscillation coordinate [mm] Disipated Power [Watt] OL45 5334 125 2,0 1,56 65,00 2,0 10-3 The technological parameters of ultrasonic welding are shown in Table 2.
Online since: November 2020
Authors: Liana Rahmayani, Dwi Septiani, Dheya Amelia Ginting, Iin Sundari, Viona Diansari
The adhesion properties of teeth to restoration have an effect on marginal adaptation.
Adhesive properties due to the exchange of calcium ions in tooth dentin with carboxylic ions in the GIC.
This can occur due to the water sensitivity properties of GIC.
Secondary caries after the placement of restoration materials in cavities can be caused by several other supporting factors involving material and restoration techniques.
Mabrouk) showed the presence of bioactive properties in silica.
Adhesive properties due to the exchange of calcium ions in tooth dentin with carboxylic ions in the GIC.
This can occur due to the water sensitivity properties of GIC.
Secondary caries after the placement of restoration materials in cavities can be caused by several other supporting factors involving material and restoration techniques.
Mabrouk) showed the presence of bioactive properties in silica.
Online since: October 2016
Authors: S.J.A. Rizvi
The microcellular foams offer superior mechanical properties in comparison to conventional foams.
It exhibits the properties of both.
This treatment improves the rheological properties of PLA [76].
It will also affect the rheological and thermal properties of PLA.
Van Krevelen, Properties of Polymer, Elsevier, New York, 1976
It exhibits the properties of both.
This treatment improves the rheological properties of PLA [76].
It will also affect the rheological and thermal properties of PLA.
Van Krevelen, Properties of Polymer, Elsevier, New York, 1976