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Online since: December 2024
Authors: Azmia Rizka Nafisah, Fadhil Muhammad Tarmidzi, Deril Setiawan, Dimas Rivaldi Ngabito
By combining chitosan and alginate, a hydrogel with enhanced mechanical properties can be obtained.
The presence of a complex structure can enhance the mechanical properties of the hydrogel.
The presence of these functional groups supports the hypothesis that the hydrogel exhibits enhanced interactions due to the synergistic effects of both alginate and chitosan, contributing to its mechanical and swelling properties.
The specific properties and concentration of chitosan used are crucial factors [13].
Michaud, “Structures, Properties and Applications of Alginates.,” Mar.
Online since: February 2013
Authors: Zhi Tao Tang, Li Qiang Xu, Tao Yu
Introduction Metal cutting is a typical thermo-mechanical process which goes together with the occurrence of high strain, high strain rate and instant temperature increasing in an absolutely small region.
The workpiece material is high-strength wrought aluminum alloy 7050- T7451 and its mechanical and physical properties are given in Table1.
Tab. 1 Mechanical and thermal properties of the material Temperature(℃) 20 100 150 200 Density(kg/m3) 2800 2800 2800 2800 Poisson’s ratio 0.33 0.33 0.33 0.33 Young’s modulus(MPa) 71.7 65.3 61.2 57.9 Yield strength(MPa) 512.5 447.8 376.2 321.4 Thermal Expansion (1 0-6/℃) 21.7 23.5 23.9 24.4 Thermal conductivity(w/m.℃) 134.2 145.3 149.8 175.6 Specific heat capacity (J/kg. ℃) 860.1 902.0 968.6 997.8 Tab. 2 Machining parameters Workpiece size 4×1×2.5mm Tool rake angle 15 Tool clearance 8 Tool flank wear 0 cutting edge inclination 30 corner radius 0 Cutting speed 1000m/min Cutting depth 0.45mm Fig. 1 Three-dimensional oblique simulation model Material Constitutive Model.
The coarser and large elements are allocated in the area of the workpiece and tool not affected by the cutting process [5].
The tool corner radius is one of main factors of influence on the cutting forces.
Online since: November 2015
Authors: E. Sidhuvilaji, B. Prabu, A.V. Raviprakash, Duraikannou Peroumal
., Raviprakash A.V.4d 1 Research scholar, Dept. of Mechanical Engineering, JNTU, Hyderabad – 500085, India. 2,3,4 Dept. of Mechanical Engineering, Pondicherry Engineering College, Puducherry 605014, India.
One of the important conclusions arrived was that centrally located dent affects the shear loading capacity more than the dents located near edges.
Hai et al.[6] in their work, proposed a method to determine global reliability index and sensitivity expression of reliability index of the plate structure with a local dent based on ultimate strength reduction factor.
Results indicate that with increase in dent depth, the five types of dents affect the ultimate strength of the plate in different trends.
The dimensions and material properties of the structural steel plate [7] [9][10] are Length (a) = 500 mm, Width (b) = 500 mm, Thickness (t) = 4, 6, 8, 10, 12, 14, 16, 18 and 20 mm, Young’s modulus (E) = 2.058 x 105 N/mm2, Yield stress (σy) = 313.6 N/mm2, Poisson’s ratio (ν) = 0.3, Mass density (r) = 7800 kg/m3, Zero strain hardening effect is assumed.
Online since: May 2011
Authors: Yong Qian Zheng, Jin Ping Zhuang
The simulation includes the calculations of temperature distribution and the mechanical behavior of the wall in fire, and the temperature calculation is the base of the latter.
In the modeling, the thermal properties for the steel and concrete such as conductivity, specific heat and thermal expansion, and the stress-strain models provided by Lie and Denham [8] are adopted herein.
It is evident that steel reinforcement yield strength does not significantly affect the fire resistance, and the fire resistance drops slightly as the steel reinforcement yield strength increases.
In fire, the temperature of steel reinforcement at the base increases dramatically and the material property degrades rapidly.
Denham: Factors Affecting the Fire Resistance of Square Hollow Steel Columns Filled With Bar-Reinforced Concrete Int.
Online since: August 2011
Authors: Zong De Fang, Xiao Fang Yang, Bao Bin Wang, Jin Fu Du
Their researches showed that the solar wheel factor, the number of planet gears factor, errors factor affect the load sharing coefficient to varying degrees.
The equations of torque equilibrium of whole system are formulated and the conditions of deformation compatibility are analyzed based on the mechanical model of power-branching transmission shown in Fig. 2.
(1) (2) Fig. 1 The schematic diagram of power-branching transmission system Fig. 2 The mechanical model diagram of power-branching transmission system Analysis of Equivalent Mesh Error In order to facilitate analysis the effect on load distribution of power-branching herringbone gears transmission system resulting from errors, the conception of equivalent mesh error is introduced.
The uneven load coefficient has much to do with the gears own properties under the condtion of same error.
Online since: March 2006
Authors: Hong Gun Kim, J.C. Huang, G.E. Yang, H.K. Lee
And the flow-induced stress causes to anisotropy and optical property, affecting surface molding state of part [3].
The conventional studies on residual stresses are limited to the thermal stress, a dominant factor of residual stress, and deformation of part.
Governing Equations and Material Properties Polymeric flow in the filling phase can be approximated to a flow between two plates separated by a small gap as shown in Fig. 1.
Materials for the thin wall applications requires good flow properties.
So, the residual stress affects the part surface quality seriously.
Online since: October 2011
Authors: Gang Kong Zhi, Jun Xu Liang
Usually there is a sliding between the contact surfaces of the connector, while the changes in temperature and humidity environment would affect the resistance of the connector contact materials.
The results show that the temperature and humidity environment and sliding has a more complex and significant impact on the performance of the contact materials than single-factors, and the tests are closer to the real working environment.
Study shows that there is not only has sliding, but also has changes in environmental factors in the actual working environment, such as temperature and humidity.
The Electrical contact failures are the results of dynamic influence and environmental factors, so the study of the combined effects of the environment and dynamic influence is very necessary.
Proceedings of the 2nd International Session on Electro-Mechanical Device.
Online since: August 2014
Authors: Yun Hai Jia, Jian Gang Li, Lin Chen
Introduction Polycrystalline diamond crystal are arranged disorderly, isotropic, no cleavage plane, has a very high hardness, good impact toughness, resistance to abrasion uniformity and excellent heat resistance, thermal conductivity and other properties.
One is the mechanical grinding. it is difficult to achieve complex shapes of the tapered edge and edge machining tool range of applications affected because of difficulties in shaping wheel, wheel serious loss, high cost and other issues [1,5].
Ko-Ta Chiang in his paper told us that the core two significant factors on the value of the material removal rate (MRR) were the discharge current and the duty factor.
The physical properties of workpieces material are showed in Table 1.
Table 1 Physical Properties of Compax Diamond Tool Blanks Property Compax 1300 Compax 1500 Compression Strength (GPa) 7.5 7.5 Elastic Modulus (GPa) 950 1100 Transverse Rupture Strength (GPa) 1.4 0.85 Thermal Conductivity (W/mkº) 525 600 Electrical Resistivity (Ω/mm) 2.0 4.0 Density (g/(cm)3) 4.0 3.9 Workpiece surface roughness A SEM photograph of unprocessed Compax 1300 is illustrated in figure 1 (a).
Online since: August 2005
Authors: Wolfgang Bleck, S. Angel, S. Harksen, P.-F. Scholz
Structural and functional properties.
Density Volume Spec. surface Edge length V F ∗ρ ρ [ g/cm³] V [mm³] F [mm²] a [mm] [10³⋅mm²/g] 0.842 455.59 1694 7.5 4.4 1.222 195.00 1029 6.0 4.3 2.104 49.14 439 3.6 4.2 Mechanical Properties.
Subsequent the effects of the pore structure and the pore form on the mechanical properties are exemplified.
Multifunctional Foam Properties.
The parameters lead to different structural and functional properties.
Online since: April 2014
Authors: D.R. Fang, L.W. Quan, J. Yang
To date, many investigations have focused on the microstructure and mechanical property of ultrafine-grained materials subjected to ECAP, however, the study on corrosion property is relatively rare.
The study on corrosion resistance of ECAP-processed materials is complex and challenging, because the corrosion resistance will be affected by many factors induced by ECAP, including grain size alteration, changes in dislocation density, increased grain boundary density, particle fragmentation, residual stress, development of texture, as well as different electrolytes [23].
In that way, grain size is an important factor for improving corrosion resistance of materials.
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