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Online since: January 2016
Authors: Aare Aruniit, Renno Veinthal, Henri Rummo
The mechanical, electrical and magnetic properties of the samples with different filler and reinforcement contents were determined.
Results of flexural properties have been shown in Table 3.
Flexural properties of different structures No.
Magnetic properties.
Another factor affecting the magnetic permeability is the average particle size and shape, whereas their effect is considered negligible compared to the loading of the magnetic filler [14].
Results of flexural properties have been shown in Table 3.
Flexural properties of different structures No.
Magnetic properties.
Another factor affecting the magnetic permeability is the average particle size and shape, whereas their effect is considered negligible compared to the loading of the magnetic filler [14].
Online since: June 2010
Authors: Dong Lu Shi, Xue Jun Wen, Eleni Katsanevakis, Ning Zhang
In comparison, polymers may mimic the mechanical
properties of native bone, however, may lack the appropriate surface properties to seamlessly
integrate with natural bone.
This approach allows for the potential to have both mechanical and chemical properties similar to that of natural bone 7.
Biomineralization of a polymer scaffold allows for mechanical and chemical properties similar to that of natural bone.
They observed enhanced mechanical properties as well as increased calcium phosphate deposition during cell culture.
Other bioactive agents being incorporated into mineral coatings include growth factors such as vascular endothelial growth factors (VEGF) and bone morphogenetic protein 2 (BMP2).
This approach allows for the potential to have both mechanical and chemical properties similar to that of natural bone 7.
Biomineralization of a polymer scaffold allows for mechanical and chemical properties similar to that of natural bone.
They observed enhanced mechanical properties as well as increased calcium phosphate deposition during cell culture.
Other bioactive agents being incorporated into mineral coatings include growth factors such as vascular endothelial growth factors (VEGF) and bone morphogenetic protein 2 (BMP2).
Online since: October 2023
Authors: Noor Ghadarah, Jim Hurley, David Ayre
However, a reduction in laminate mechanical properties was noticed.
Work by Tuloup [3] investigating the effects of embedding PZT and PVDF inside a glass fibre reinforced polymer also showed that embedding slightly lowers the mechanical properties.
It was also concluded that embedding a PVDF sensor in the composite does not significantly affect the mechanical behaviour.
It is apparent that the sensor does affect the mechanical properties of the specimen, the extent will depend on the size and shape of the sensor as well as on the thickness of the composite.
One of the suspected factors was the resin entering between the PVDF sensor and the electrical cable when infusing.
Work by Tuloup [3] investigating the effects of embedding PZT and PVDF inside a glass fibre reinforced polymer also showed that embedding slightly lowers the mechanical properties.
It was also concluded that embedding a PVDF sensor in the composite does not significantly affect the mechanical behaviour.
It is apparent that the sensor does affect the mechanical properties of the specimen, the extent will depend on the size and shape of the sensor as well as on the thickness of the composite.
One of the suspected factors was the resin entering between the PVDF sensor and the electrical cable when infusing.
Online since: July 2015
Authors: Irum Tariq, Muhammad H Hasan, Sazib Mollik
These materials offer comparable mechanical properties to conventional composites, with biocomposites having the added benefit of being biodegradable.
Therefore,the reinforcement phaseis considered an essential factor in controlling the overall composite’s performance [4, 5].
Furthermore, like CNTs, nanoclay is a particulate of the nanometre scale that enhances the properties of composites even when added in small amounts.
Biodegradable composites The use of natural fibres (such as jute, flax or hemp, among many others) in composites and polymeric matrices has a plethora of benefits including economic viability, low intrinsic density, enhanced energy recovery, high specific mechanical properties and biodegradability.
Hence, we can infer that natural fibers possess great potential to replace synthetic ones, like glass, carbon or aramid for specific applications, since they have comparable mechanical properties in addition to being recyclable and non-polluting.[10, 11].
Therefore,the reinforcement phaseis considered an essential factor in controlling the overall composite’s performance [4, 5].
Furthermore, like CNTs, nanoclay is a particulate of the nanometre scale that enhances the properties of composites even when added in small amounts.
Biodegradable composites The use of natural fibres (such as jute, flax or hemp, among many others) in composites and polymeric matrices has a plethora of benefits including economic viability, low intrinsic density, enhanced energy recovery, high specific mechanical properties and biodegradability.
Hence, we can infer that natural fibers possess great potential to replace synthetic ones, like glass, carbon or aramid for specific applications, since they have comparable mechanical properties in addition to being recyclable and non-polluting.[10, 11].
Online since: June 2014
Authors: Ping Zhang, Yi Kun Hou, Hong Gen Qin, Chao Ming Pang, Jia Jun Deng
Different Salt Solution on the Deterioration of Marine Engineering Concrete Under the Action of Chemical- Mechanical Coupling
Honggen Qina, Jiajun Dengb, Ping Zhangc, Chaoming Pangd, Yikun Houe
School of Materials Science and Engineering, Southeast University Nanjing, 211189, PR China.
Introduction The durability of the concrete generally refers to the property or ability to resist physical, chemical or mechanical factors.
Coupling of all above factors could accelerate the damage process of concrete remarkably.
TABLE1 THE MAIN CHEMICAL COMPOSITIONS OF RAW MATERIALS Parameters ω(CaO) ω(SiO2) ω(Al2O3) ω(Fe2O3) ω(MgO) ω(SO3) Cement 65.03 21.38 4.71 3.68 2.53 0.53 Fly ash 3.49 52.42 33.25 4.53 1.07 / Slag 36.35 33.48 12.21 1.41 10.60 0.66 TABLE 2 PROPORTION OF CONCRETE MIXTURE PREPARED Group C FA SL W S G JM-PCA ρco[kg/m3] C50FS 0.40 0.30 0.30 0.33 1.50 2.50 0.51 2390 Test mechanical properties of the specimens after standard curing for 90 days: the compressive strength was 57.6MPa and the flexural strength was 8.7MPa.
Fig.7 The Concentration of the Chloride Ion Fig.8 The Concentration of the Sulfate Ion Conclusions (1) Under the coupling effect of wetting and drying cycle and bending load, different salt solution affects the durability of marine concrete at different degrees: sulfate salt is more corrosive than chloride salt, simulated seawater is similar to 5.0%Na2SO4 solution, while five-time simulated seawater is the most corrosive
Introduction The durability of the concrete generally refers to the property or ability to resist physical, chemical or mechanical factors.
Coupling of all above factors could accelerate the damage process of concrete remarkably.
TABLE1 THE MAIN CHEMICAL COMPOSITIONS OF RAW MATERIALS Parameters ω(CaO) ω(SiO2) ω(Al2O3) ω(Fe2O3) ω(MgO) ω(SO3) Cement 65.03 21.38 4.71 3.68 2.53 0.53 Fly ash 3.49 52.42 33.25 4.53 1.07 / Slag 36.35 33.48 12.21 1.41 10.60 0.66 TABLE 2 PROPORTION OF CONCRETE MIXTURE PREPARED Group C FA SL W S G JM-PCA ρco[kg/m3] C50FS 0.40 0.30 0.30 0.33 1.50 2.50 0.51 2390 Test mechanical properties of the specimens after standard curing for 90 days: the compressive strength was 57.6MPa and the flexural strength was 8.7MPa.
Fig.7 The Concentration of the Chloride Ion Fig.8 The Concentration of the Sulfate Ion Conclusions (1) Under the coupling effect of wetting and drying cycle and bending load, different salt solution affects the durability of marine concrete at different degrees: sulfate salt is more corrosive than chloride salt, simulated seawater is similar to 5.0%Na2SO4 solution, while five-time simulated seawater is the most corrosive
Online since: December 2014
Authors: Diogo Pedro, Jorge de Brito, Luís Evangelista
According to Tam et al. [14], the presence of pores and cracks in the mortar next to the interfacial transition zone (ITZ) causes a weak link in the microstructure of concrete, affecting the global strength.
Results and discussion This section presents and comments the results of the hardened concrete properties (mechanical and durability characteristics).
Figure 3 - 28-day modulus of elasticity These results show that this property is influenced by the cement paste, aggregate type, the bond and distribution of the concrete constituents, i.e. the factors that affect the overall deformability of the composite.
Rahal, Mechanical properties of concrete with recycled coarse aggregate, Build Environ. 42 (2007), 407–15
Kliszczewicz, Influence of recycled aggregates on mechanical properties of HS/HPC, Cem.
Results and discussion This section presents and comments the results of the hardened concrete properties (mechanical and durability characteristics).
Figure 3 - 28-day modulus of elasticity These results show that this property is influenced by the cement paste, aggregate type, the bond and distribution of the concrete constituents, i.e. the factors that affect the overall deformability of the composite.
Rahal, Mechanical properties of concrete with recycled coarse aggregate, Build Environ. 42 (2007), 407–15
Kliszczewicz, Influence of recycled aggregates on mechanical properties of HS/HPC, Cem.
Online since: December 2023
Authors: Theingi Nwe, Monsak Pimsarn
The SIF provides information about the maximum stress at the tip of a crack, and it is affected by factors such as geometry, material properties, and load.
Press-fitting can introduce residual stresses, which can significantly affect the SIF and residual fatigue life of the axle.
Figure 6 shows the variation of stress intensity factors along the crack front, which are determined under stable and adverse running conditions.
These factors can lead to crack initiation and propagation in the axle, which can increase the SIF value.
An investigation on the influence of rotary bending and press-fitting on stress intensity factors and fatigue crack growth in railway axles.
Press-fitting can introduce residual stresses, which can significantly affect the SIF and residual fatigue life of the axle.
Figure 6 shows the variation of stress intensity factors along the crack front, which are determined under stable and adverse running conditions.
These factors can lead to crack initiation and propagation in the axle, which can increase the SIF value.
An investigation on the influence of rotary bending and press-fitting on stress intensity factors and fatigue crack growth in railway axles.
Online since: August 2014
Authors: T.V. Moorthy, Udaya Prakash J, S. Ananth
Both continuously and discontinuously reinforced MMCs are made by dispersing reinforcement into a metal matrix.MMCs are well known for their superior mechanical properties over unreinforced alloys and used in applications requiring high strength, thermal conductivity, damping properties and low coefficient of thermal expansion with lower density.
These properties of MMCs increase their usage in automobile and wear applications.
Consequently, data for properties of bulk ceramics are commonly used as estimates.
The sliding speed is the most significant factor affecting the wear rate, followed by load and sliding distance.
The sliding speed is the most significant factor affecting the wear rate, followed by load and sliding distance.
These properties of MMCs increase their usage in automobile and wear applications.
Consequently, data for properties of bulk ceramics are commonly used as estimates.
The sliding speed is the most significant factor affecting the wear rate, followed by load and sliding distance.
The sliding speed is the most significant factor affecting the wear rate, followed by load and sliding distance.
Online since: November 2020
Authors: Alicia Mašlejová, Lucia Hrabčáková, Atila Drotár, Peter Kalmár, Mária Demčáková, Peter Vranec, Pavol Zubko, Slavka Hockicková
The most significant effect on quality of weld joints and their final mechanical properties has relative position of strip ends and geometry of cutting edge.
Introduction Weld quality is an important factor that should be taken into the account in analysis of process efficiency.
Appropriate choice of process parameters is not a function for maximization of welding process efficiencies, but a search for an acceptable balance between contending factors of physical and metallurgical effects.
Directly at plant was performed mechanical test of welds to approve the performance of weld by Erichsen cup test.
Katayama, Effects of laser focusing properties on weldability in high-power fiber laser welding of thick high-strength steel plate.
Introduction Weld quality is an important factor that should be taken into the account in analysis of process efficiency.
Appropriate choice of process parameters is not a function for maximization of welding process efficiencies, but a search for an acceptable balance between contending factors of physical and metallurgical effects.
Directly at plant was performed mechanical test of welds to approve the performance of weld by Erichsen cup test.
Katayama, Effects of laser focusing properties on weldability in high-power fiber laser welding of thick high-strength steel plate.
Online since: August 2010
Authors: Lee Ku Kwac, Hong Gun Kim
In
addition, straightness error of spindle, thermal expansion error of mechanical structure is analyzed to
detect movement error property in ultra-precision machining.
It can be confirmed that nonlinear characteristics of a system is dominated not by mechanical factors but by the properties of piezoelectric actuator and hysteresis due to electrical nonlinear characteristics.
It occurs because of hysteresis due to the properties of piezoelectric actuator and the operating characteristics of electrical/mechanical control system and it is considered that in low frequency input signal, nonlinear characteristics were dominant due to hysteresis phenomenon however, as the frequency increased the nonlinear characteristics due to the operating characteristics of the control system increased.
Consequently, to compensate for all the input condition of the nonlinear characteristics of piezoelectric actuator, we have to take into account, separately, for the hysteresis phenomenon due to the properties of matter and the nonlinear characteristics due to operating characteristics.
Specific orbit can hysteresis of piezoelectric actuator affect the displacement and the output voltage of inverse-hysteresis model can be produced when critical point is put into input.
It can be confirmed that nonlinear characteristics of a system is dominated not by mechanical factors but by the properties of piezoelectric actuator and hysteresis due to electrical nonlinear characteristics.
It occurs because of hysteresis due to the properties of piezoelectric actuator and the operating characteristics of electrical/mechanical control system and it is considered that in low frequency input signal, nonlinear characteristics were dominant due to hysteresis phenomenon however, as the frequency increased the nonlinear characteristics due to the operating characteristics of the control system increased.
Consequently, to compensate for all the input condition of the nonlinear characteristics of piezoelectric actuator, we have to take into account, separately, for the hysteresis phenomenon due to the properties of matter and the nonlinear characteristics due to operating characteristics.
Specific orbit can hysteresis of piezoelectric actuator affect the displacement and the output voltage of inverse-hysteresis model can be produced when critical point is put into input.