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out by CHEN [10], the stress/strain rate relation can be deduced from the normality condition related to a yield function. Hoek-Brown nonlinear failure criterion, which can be employed to evaluate... of the simulation. The H-B yield criterion invoked in the FLAC is expressed by the major and minor principal stresses, whereas the H-B yield criterion employed in theoretical calculation is expressed by normal......
. As the sintering temperature was increased from 700 to 1000 °C, the strain-to-failure of the alloys rose from 4.4% to 38.2%, whereas the yield strength decreased from 1682 to 774 MPa. The bulk FeCoCrNiMn..., exceeding fracture toughness of the most other materials [5]. But, the alloy has relatively low yield strength. Several approaches can be used to improve the yield strength of the FeCoCrNiMn alloy. One......
and dislocation strengthening, the yield strength of Mo-2.0vol.%Al2O3 alloy annealed at 1200 °C is approximately 56.0% higher than that of pure Mo. The results confirm that the addition of Al2O3..., respectively. And these samples were prepared for each set of tests. In the current work, the average yield strength was calculated on the basis of the results of three compression specimens. 2.3 Nano......
that a power criterion exists for the grain refinement in the current system. Key words: vibration; chilling; detachment; refinement; NH4Cl-H2O alloy 1 Introduction Evenly distributed equiaxed... is satisfied with kP≥200, the phenomenon of atomization will happen and grain refinement will be enhanced dramatically. Consequently, Eq.(8) can be regard as an energy criterion to grain refinement......
was adopted as the criterion, the similar mine was referred to determine the selection of structural parameters of the stope. Combined with FLAC3D numerical analysis software, the safety factor of some...减有限元法中边坡失稳的塑性区判据及其应用[J]. 防灾减灾工程学报, 2003, 23(3): l-8. LUAN Maotian, WU Yajun, NIAN Tingkai. A Criterion for evaluating slope stability based on development of plastic zone by shear strength reduction......
and then the foregone failure criterion of 5% reduction in natural frequency is improved. The influence of section and spacing of the stiffeners on the vibration fatigue behavior of the aluminum plate... in fundamental frequency as the failure criterion to determine the fatigue life of plate. Fatigue damage analysis for multi-point spot-welded joints was carried out by HAN et al [16], based on the changes......
Fig. 5 Relationship between yield strength and strain rates of different samples under loading directions of ND 图6 不同试样在ND载荷方向下的真应变与应变速率的关系 Fig. 6 Relationship between true strain... the activation of multiple twin variants and double twins. For the samples of pre-twinning along TD, the compressive yield strength along ND of high strain rates decreases due to the occurrence of de-twinning......
GM T材料界面及性能研究 陈辉1,陈蔚岗1,周玉2,陈二龙1,张淑萍1 (1.哈尔滨玻璃钢研究所;2.哈尔滨工业大学) 摘要:本文研究了GMT湿法成型工艺中PP接枝改性及偶联剂对材料界面及性能的影响,并通过SEM对材料拉伸断口形貌进行了分析. 关键词:GMT湿法工艺; PP接枝; 偶联剂; 界面及性能; [全文内容正在添加中] ......
高锰酸盐指数的灰色GM(1,1)预测 杨满芽1,何小青2,江发平1 (1.中山市环境监测站,中山,528403;2.深圳市计量检验研究院,深圳,518055) 摘要:以中山市岐江河近7年的高锰酸盐指数监测数据为基础,采用灰色系统理论中的预测方法,建立了岐江河高锰酸盐指数的灰色预测模型.用该模型预测岐江河2006年,2007年,2008年高锰酸盐指数的值分别为5.3,5.4和5.4. 关键词:高锰酸盐指数; 灰色预测; 灰色模型; [全文内容正在添加中] ......
基于GM(1,1)的CSTR故障预报董立立,黄道摘 要:应用灰预测模型对连续搅拌式反应釜进行了状态预报检验,并给出了的灰建模过程.结果表明,根据自身数据建立动态微分方程再预报自身发展的灰预测是可行的,该预测模型计算简便,结果可靠.该方法能够及早判明故障的发展趋势及对设备的危害程度,避免了灾难性的事故发生,为故障状态下的设备停车与否提供决策指导,维护设备安全和长周期的运行.关键词:灰理论;连续搅拌式反应釜;设备状态;动态预报;......