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Online since: July 2017
Authors: Volker Piotter, Metin Tueluemen, Thomas Hanemann, Michael J. Hoffmann, Rainer Oberacker
Flow paths in the machinery parts, rheological properties of binding system, fiber content and the fiber orientation have significant effect on the flow behavior of the feedstock, fiber -orientation, -distribution & -length, which are crucial to understand the properties of end-parts like mechanical reinforcement of the fibers.
Besides the material related issues, the type of shaping-process and the processing parameters required equivalent attention that affect directly the finished product properties.
Finally, sintering temperature & time have a determinant role on microstructure; hence, they influence the physical properties, like density, toughness, etc.
Above 2,2 mg/m² dispersant all the solid content would be covered at least once and the fiber breakage did not affect the measurement as much as at 1,1 mg/m² dispersant.
The future works will concentrate on diagnosing and improving the mechanical properties in association with the predictive factors of this study like fiber content, fiber orientation and temperature, but also alternatively sintering time and fiber length.
Besides the material related issues, the type of shaping-process and the processing parameters required equivalent attention that affect directly the finished product properties.
Finally, sintering temperature & time have a determinant role on microstructure; hence, they influence the physical properties, like density, toughness, etc.
Above 2,2 mg/m² dispersant all the solid content would be covered at least once and the fiber breakage did not affect the measurement as much as at 1,1 mg/m² dispersant.
The future works will concentrate on diagnosing and improving the mechanical properties in association with the predictive factors of this study like fiber content, fiber orientation and temperature, but also alternatively sintering time and fiber length.
Online since: April 2023
Authors: Shao Hua Yin, Chang Ning LI
Gu Xiaolong et al. [21] further studied the effects of brazing temperature and holding time on the mechanical properties of Al2O3 ceramic and Kovar alloy brazed joints.
The results show that the main influencing factors are laser power.
The smaller the output power is, the lighter the interfacial reaction is, and the better the mechanical properties of the joint are.
Wang, Mechanical property of alumina ceramic/AgCuTi/Kovar alloy brazed joint, J.
YU, Microstructure and Mechanical Properties of Partial Transient Liquid Phase Bonded Si3N4-DZ483 SuperalloyJoints, J.
The results show that the main influencing factors are laser power.
The smaller the output power is, the lighter the interfacial reaction is, and the better the mechanical properties of the joint are.
Wang, Mechanical property of alumina ceramic/AgCuTi/Kovar alloy brazed joint, J.
YU, Microstructure and Mechanical Properties of Partial Transient Liquid Phase Bonded Si3N4-DZ483 SuperalloyJoints, J.
Online since: February 2020
Authors: Denis Veselov, Nikolay Samotaev, Konstantin Oblov, Anastasia Ivanova, Maya Etrekova, Anastasiya Gorshkova
.), In addition, platinum is weakly susceptible to oxidation in air, which makes it easier experiments on its adhesion to ceramics due to the absence of a chemical factor in the materials interaction.
Spraying through a mask imposes on the topology a number of restrictions on the pattern geometry due to the mechanical properties of the mask material itself.
Too long curves and voids lead to sagging of mask elements with their subsequent mechanical destruction.
(c) Metallization processing mode, leading to its detachment from the front side and not affecting the metallization from the reverse side.
The processing mode of metallization, leading to its detachment from the front side, presented in Figure 1c (T = 4ns, P = 0.04 W (0.2%), S = 600 mm/s, F = 50 kHz, 100 lines/mm), and not affecting the metallization on the reverse side, does not lead to evaporation of metallization along the vector contour.
Spraying through a mask imposes on the topology a number of restrictions on the pattern geometry due to the mechanical properties of the mask material itself.
Too long curves and voids lead to sagging of mask elements with their subsequent mechanical destruction.
(c) Metallization processing mode, leading to its detachment from the front side and not affecting the metallization from the reverse side.
The processing mode of metallization, leading to its detachment from the front side, presented in Figure 1c (T = 4ns, P = 0.04 W (0.2%), S = 600 mm/s, F = 50 kHz, 100 lines/mm), and not affecting the metallization on the reverse side, does not lead to evaporation of metallization along the vector contour.
Online since: September 2013
Authors: Xiao Ying Yin, Bi Ying Sha, Qing Shan Liu, Ling Zhang
CS-graft-poly(methyl methacrylate) copolymer nanoparticles are new polymeric materials that possess both good mechanical and biocompatibility properties[9-11].
Factors and the corresponding levels Factors 1 2 3 Reaction time (h) A 1.5 2.0 2.5 Amount of chitosan (g) B 0.15 0.3 0.45 Amount of MMA(g) C 0.5 1.0 1.5 Volume of TBHP(mL) D 0.2 0.3 0.4 Table 2.
Conclusions By this method, we can obtain graft copolymerization nanoparticles with excellent chemical and physical properties .
Stimulus Properties of PMMA: Effect of Optical Isomers and Conformational Restriction[J].
Experimental study of tensile properties of PMMA at intermediate strain rate[J].
Factors and the corresponding levels Factors 1 2 3 Reaction time (h) A 1.5 2.0 2.5 Amount of chitosan (g) B 0.15 0.3 0.45 Amount of MMA(g) C 0.5 1.0 1.5 Volume of TBHP(mL) D 0.2 0.3 0.4 Table 2.
Conclusions By this method, we can obtain graft copolymerization nanoparticles with excellent chemical and physical properties .
Stimulus Properties of PMMA: Effect of Optical Isomers and Conformational Restriction[J].
Experimental study of tensile properties of PMMA at intermediate strain rate[J].
Online since: December 2012
Authors: Yang Gao, Ying Ying Zhang, Cheng Long Li, Chun Hua Wang
The 20CrMnMo material properties is better than 16Mn[7],and dangerous location is often not in the sidewall, under the premise of not affecting the analysis results, to simplify the solution process this article uses 16Mn material in the overall analysis.
This paper uses the Mohr-Coulomb elastic-plastic model to simulate the soil materials[9,10].Model yield function is (1) Where: is Shear stress, is Normal stress, is Adhesion, is internal frictional angle, Adhesion and internal frictional angle relate to Strain hardening factor.
The basic mechanical parameters of soil: The Soil density is 1.96, Plastic coefficient is 16.5, Adhesion is 19.99Mpa, internal frictional angle is 0.3889rad, Uniaxial compressive strength is 20MPa, elasticity modulus is 68.93MPa, Poisson ratio is 0.3.
The other working condition: bucket maximum stress is 88.43MPa ,the maximum displacement of the bucket is 2.472mm; two conditions contrast that the stresses drawn bucket teeth, bucket roots of ear plate, hinged at and reinforcing the region affected are large.
Beijing; Mechanical Industry Press,2011 [9] Zheng Ying-ren , Kong Liang Soil geotechnical plastic mechanics,M.
This paper uses the Mohr-Coulomb elastic-plastic model to simulate the soil materials[9,10].Model yield function is (1) Where: is Shear stress, is Normal stress, is Adhesion, is internal frictional angle, Adhesion and internal frictional angle relate to Strain hardening factor.
The basic mechanical parameters of soil: The Soil density is 1.96, Plastic coefficient is 16.5, Adhesion is 19.99Mpa, internal frictional angle is 0.3889rad, Uniaxial compressive strength is 20MPa, elasticity modulus is 68.93MPa, Poisson ratio is 0.3.
The other working condition: bucket maximum stress is 88.43MPa ,the maximum displacement of the bucket is 2.472mm; two conditions contrast that the stresses drawn bucket teeth, bucket roots of ear plate, hinged at and reinforcing the region affected are large.
Beijing; Mechanical Industry Press,2011 [9] Zheng Ying-ren , Kong Liang Soil geotechnical plastic mechanics,M.
Online since: September 2012
Authors: Tsung Hsin Hung
Introduction
The SMT (Surface Mount Technology) manufacturing process involves multiple factors of machinery and materials, with considerably complex and extensive variables.
Finally, factors and average values were adjusted to the target values, and sensitivity was calculated to determine the adjustment of factors.
After literature review and industrial interviews, this study identified 10 control factors and 10 fixed factors influencing the solder thickness of the soldering machine of the SMT process.
The FAHP method was employed to select the top five factors for two categories, as shown in Table 1.
Table 1 Analysis of controllable factors Factor DFij Range Current State Controllable factors Control factors A.
Finally, factors and average values were adjusted to the target values, and sensitivity was calculated to determine the adjustment of factors.
After literature review and industrial interviews, this study identified 10 control factors and 10 fixed factors influencing the solder thickness of the soldering machine of the SMT process.
The FAHP method was employed to select the top five factors for two categories, as shown in Table 1.
Table 1 Analysis of controllable factors Factor DFij Range Current State Controllable factors Control factors A.
Online since: October 2010
Authors: Qing Xue Huang, Jian Jun Hao, Xue Liang Zhang
Aluminum
quality will directly affect vehicle body's strength and assembly quality, and its quality mainly
includes strength index and shape precision.
However, because of many affecting factors, suitable parameters for straightening process will directly affect straightening effect.
While straightening force can be determined by material strength properties curve and F δ− curve model.
Mechanical Strength, Vol. 27(2005), No.5, p.636 (In Chinese).
However, because of many affecting factors, suitable parameters for straightening process will directly affect straightening effect.
While straightening force can be determined by material strength properties curve and F δ− curve model.
Mechanical Strength, Vol. 27(2005), No.5, p.636 (In Chinese).
Online since: March 2006
Authors: Won Seok Jung, Dong Ho Bae, J.B. Heo
Chemical composition and mechanical
properties are illustrated in Table 1.
In case of spot welding between similar steel sheets, i.e., STS301L, STS304L, SPCC, and SPCD, by similarity of electric, thermal, and mechanical properties, quantitative differences of welding conditions considering pressure (p), current (I), and current time (t) were not large.
In spite of different electric, thermal and mechanical properties, the difference of optimum welding condition was a little.
And, as shown in Fig. 3, amount of major compositions were changed in the border of spot welded lap joint between dissimilar materials, this is supposed due to the fact that new composition distribution by diffusion of each compositions was made in the joining interface of spot weld..Static failure was mostly occurred on the side of material that mechanical properties is relatively lower.
And by the many researchers, it has known that, considering material, the geometric factors, and welding condition on fatigue strength evaluation of spot welded lap joint, ∆P-Nf curves of Fig. 4 sensitively get their influences 5, 7) .
In case of spot welding between similar steel sheets, i.e., STS301L, STS304L, SPCC, and SPCD, by similarity of electric, thermal, and mechanical properties, quantitative differences of welding conditions considering pressure (p), current (I), and current time (t) were not large.
In spite of different electric, thermal and mechanical properties, the difference of optimum welding condition was a little.
And, as shown in Fig. 3, amount of major compositions were changed in the border of spot welded lap joint between dissimilar materials, this is supposed due to the fact that new composition distribution by diffusion of each compositions was made in the joining interface of spot weld..Static failure was mostly occurred on the side of material that mechanical properties is relatively lower.
And by the many researchers, it has known that, considering material, the geometric factors, and welding condition on fatigue strength evaluation of spot welded lap joint, ∆P-Nf curves of Fig. 4 sensitively get their influences 5, 7) .
Online since: November 2013
Authors: Jia Yin Tang, Ping He, Shi Juan Cheng
However the density function of environmental factors is difficult to determine.
Xie(2005)developed the failure model according to the property of order statistics, studied the common cause failure between components in a k-out-of-n systems, not involved the affiliate failure factors, and regard the lifetimes variables of components as independent.
Under these assumptions, by using the geometric process, the vector Markov process and the queuing theory, derived reliability indices for such a k/n(F) system with repairable repair-equipment and discussed its properties.
In this paper, decomposing correlation structure and their marginal distributions of component lifetimes, common cause failure and affiliate failure are considered synthetically which are two types of factors leaded to failure dependency in k/n(F) voting systems.
Reliability properties of consecutive k-out-of-n systems of arbitrarily dependent components, Reliability Engineering and System Safety. 94 (2009) 350-356
Xie(2005)developed the failure model according to the property of order statistics, studied the common cause failure between components in a k-out-of-n systems, not involved the affiliate failure factors, and regard the lifetimes variables of components as independent.
Under these assumptions, by using the geometric process, the vector Markov process and the queuing theory, derived reliability indices for such a k/n(F) system with repairable repair-equipment and discussed its properties.
In this paper, decomposing correlation structure and their marginal distributions of component lifetimes, common cause failure and affiliate failure are considered synthetically which are two types of factors leaded to failure dependency in k/n(F) voting systems.
Reliability properties of consecutive k-out-of-n systems of arbitrarily dependent components, Reliability Engineering and System Safety. 94 (2009) 350-356
Online since: September 2005
Authors: Hong Gun Kim, H.K. Lee, G.E. Yang
The thermal-induced stress leads to the deformation of the parts; the flow-induced stress
alludes anisotropy and optical property, affecting the surface molding state of a part [3].
The conventional studies on residual stresses are limited to the thermal stress, a dominant factor of residual stress, and to the deformation of the part.
Governing Equations and Material Properties Polymeric flows in the filling phase can be approximated to a flow between two plates separated by a small gap.
Materials for the thin wall applications require good flow properties; thus, ABS, which is made from 3 monomers of Acrylonitrile, Butadiene, and Styrene, was used as an amorphous polymer and PP (Polypropylene) as a crystalline polymer.
The properties of two polymers are arranged in Table 1.
The conventional studies on residual stresses are limited to the thermal stress, a dominant factor of residual stress, and to the deformation of the part.
Governing Equations and Material Properties Polymeric flows in the filling phase can be approximated to a flow between two plates separated by a small gap.
Materials for the thin wall applications require good flow properties; thus, ABS, which is made from 3 monomers of Acrylonitrile, Butadiene, and Styrene, was used as an amorphous polymer and PP (Polypropylene) as a crystalline polymer.
The properties of two polymers are arranged in Table 1.