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. The computational methods for the Maxwell model fitting were achieved in MATLAB software. It is found that fitting precision of the two methods is very high. The method of solving linear equations needs more... can get higher fitting precision. But the method of solving linear equations needs more fitting points and more numbers of Maxwell model. It will result in the program of finite element analysis complex......
system. Aluminium 6061-T6 was used to extract strain responses on the striker during Charpy impact testing. Statistical analysis was performed using the I-kaz method, and curve fitting equations based on the equation for vibration response under a non-periodic force were used to evaluate the Charpy impact signals. The I-kaz coefficients and curve fitting equations were then compared and discussed......
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and Garofalo model are successfully used to describe the creep behavior of SnAgCu and SnAgCuCe alloys. The parameters of the two creep constitutive equations for SnAgCu and SnAgCuCe solders are determined from separated constitutive relations and experimental results. Nonlinear least-squares fitting is selected to determine the model constants. The experimental data of the stress-creep strain rate curves......
the fitting precision. The parameters of the reconstructed surface topography are calculated. 2) All the data points are then imported into CATIA through point cloud technology to simulate the 3D rough... Conclusions 1) The surface topography with specific parameters is obtained through surface reconstruction technology. Interpolation is performed before point cloud fitting to make the surface smoother......
J. Cent. South Univ. Technol. (2009) 16: 0339-0343 DOI: 10.1007/s11771-009-0057-8 Parameter fitting of constitutive model and FEM analysis of solder joint thermal cycle reliability for lead... to those of solder Sn-37Pb. The parameters in Anand model for solder Sn-3.5Ag were fitted based on experimental data and nonlinear fitting method, and its validity was checked by means of experimental......
YJ. Cent. South Univ. Technol. (2009) 16: 0482-0487 DOI: 10.1007/s11771-009-0081-8 Constitutive equations and finite element implementation of strain localization in sand deformation HUANG..., while the pore stress flows nearly horizontally and is distributed equally far away the shear band region. Key words: constitutive equations; deformation band; finite elements; hydraulic......
J. Cent. South Univ. Technol. (2008) 15(s1): 005-008 DOI: 10.1007/s11771-008-302-6 On energy boundary layer equations in power law non-Newtonian fluids ZHENG Lian-cun(郑连存)1, ZHANG Xin-xin(张欣欣)2..., Beijing 100083, China) Abstract: The hear transfer mechanism and the constitutive models for energy boundary layer in power law fluids were investigated. Two energy transfer constitutive equations......
with decreasing the grain size at high strain rates and decreases with decreasing the grain size at low shear rates. Several fitting equations were obtained by using the power law equation, and the method... characteristic. Although some researches about the rheological behavior of semi-solid alloys were reported, rather less attention was paid to ZK60-RE magnesium alloy and the fitting equations. In this study......