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aligned along the extrusion direction in Mg97Zn1Y2 extruded alloy, acted as hardening phases, just like reinforced fibers. Key words: plastic deformation; yield stress; LPSO-phase; dislocation... properties were elucidated. In the present work, the temperature dependence, orientation dependence, and tension-compression asymmetry of the yield stress were particularly investigated. By comparing......
-shaped function and supplement its definition in the deviatoric section, and then a yield criterion suitable for 3D stress conditions is obtained; 2) to elaborate its numerical implementation based.... LU et al [28] developed a nonlinear unified strength model based on the characteristic stress concept. One remarkable feature for these yield criteria is: representations of meridian and deviatoric......
, slender plastic zone at the crack tip in a non-hardening material under plane stress, the Dugdale model proposed the extent of the plastic zone, just as shown in Fig.5(a). The yield plastic zone... opening displacement (CTOD), σs, y is the yield stress of y axial, and G is the shear elastic modulus. CTOD and Dugdale model have been applied widely under uniaxial loading[13-16......
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the sedimentary stability. Using 45# transformer oil instead of special shock absorption fluid as a carrier of MRF, the shear yield stress remains nearly constant but the viscosity and the sedimentary stability...-state viscosity, but has no function on the shear yield stress. In magnetic field of 237 kA/m, the shear yield stress of MRF based on special shock absorption fluid is 18.34 kPa and the shear yield......
between yield stress and slurry concentration 绘制n值与浓度关系图如图4所示.由图4可知,浆体浓度增长的情况下,n值呈现指数下降的趋势.用Origin 2015软件对浓度-流动指数曲线进行拟合,函数为 ,拟合结果:a= 0.42127,b=3.64856×107,c=-3.84401,其中Adj.R2=0.99002.由该方程得出当y=1时,x取值为... and yield stress 从表2可以看出,4种拟合函数中Ploy4,DoseResp和Logistic能够较好地拟合试验得到的数据,且DoseResp函数的调整相关系数在四者中最大,说明DoseResp函数是拟合函数的最佳选择.另一方面,Ploy4函数虽然在64%~73%之间对数据拟合度良好,但当料浆浓度低于64%或者高于73%时出现"反常"变化,即低值范围内得到屈服应力为负值,高值范围内屈服应......
strain and strain rate: (15) where σ is flow stress; ε is the strain; A is the yield stress at reference temperature... temperature and minimum strain rate) were taken as the reference temperature and strain rate in the Johnson-Cook (JC) model, respectively. In the equation, A is the yield stress (10.68 MPa......
were removed. Fig.1 FEM model of welding specimen 3 Material properties Two different material models were established based on the test results. Perfect plastic yield stress model (PM) was conventional only temperature- dependent material model. In PM, the yield stress varies with temperature during heating and cooling stage. Flow stress model (FM) was temperature- and plastic-strain......
electron microscopy. The results show the experimental temperature has no significant effect on the tensile strengths, which are greater than 1 000 MPa from room temperature to 800 ℃. The yield strength reaches its maximum (970 MPa) at 800 ℃. When the experimental temperature is higher than 800 ℃, the tensile and yield strengths decrease evidently and the ductility increases remarkably. The fractograph......
with that of the experiment, the real strain hardening exponent was acquired. Once the strain hardening exponent was determined, the initial yield stress σy of metals could be obtained by the power law...; representative stain; initial yield stress 1 Introduction Nanoindentation, originally developed by DOERNER and NIX [1] and later further improved by OLIVER and PHARR [2,3], is arguably one of the quickest......