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喷丸强化过程及冲击效应的数值模拟张洪伟1,张以都1,吴琼1(1.北京市北京航空航天大学机械工程及自动化学院虚拟现实技术与系统国家重点实验室)摘 要:运用大型有限元软件LS-DYNA建立了喷丸强化处理过程的三维有限元模型,研究了弹丸冲击作用下,铝合金材料Al2024-T3动态响应过程中的应力波结构,应变率效应及应力波衰减效应等动态参量;研究了弹丸搭接率对于残余应力场的影响,建立了高覆盖率多丸粒强化模型;研究了冲击顺序,材料应变率及初始残余应力对强化效应的影响;研究了喷丸强化后的表面微观变形特征.分析结果表明,弹丸......
J. Cent. South Univ. (2019) 26: 2447-2463 DOI: https://doi.org/10.1007/s11771-019-4186-4 Petrel2ANSYS: Accessible software for simulation of crustal stress fields using constraints provided...: Crustal stresses play an important role in both exploration and development in the oil and gas industry. However, it is difficult to simulate crustal stress distributions accurately, because......
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stress of the simulative component is the same as that of the practical component. The ratio of welding residual stress attained by the experiment or the simulation method between the practical runner and the simulative component was compared with the ratio obtained by the similitude principles. Moreover, the error is less than 10%. This provides a new idea to predict the welding stress distribution......
ratio is higher than 6 and the excessive MgO exsits in the hydration products, the cement paste may be damaged by the excessive crystallization stress of a great deal of Mg(OH)2 formation.关键词:...Influence of MgO/MgCl2 Molar Ratio on Phase Stability of Magnesium Oxychloride Cement巴恒静,关辉摘 要:Formation, solution and phase change of hydration products......
the assumption that the film remains elastic, the stress σ in the film can be calculated by the equation[15] where E and ν are elastic modulus and Poissons ratio of the film respectively; L...Article ID: 1003-6326(2005)02-0414-05 Influences of post-annealing and internal stress on magnetoresistance properties of Ni80Fe20 films GAO Yan-qing(高艳清), WU Ping(吴 平), CAI En-jing(蔡恩静......
tensile stiffness on the critical height ratio, stress concentration ratio, soil arching ratio, geosynthetic tension and axial strain were investigated. This study suggests that a RPC of 1:1.0 and a one-way...; (2) As previously assumed, the soil stress at the arch foot enters the active state first. Then, an earth pressure coefficient, which is the ratio of the horizontal stress......
Effect of (Ba+Sr)/Ti ratio on dielectric and tunable properties of Ba0.6Sr0.4TiO3 thin film prepared by sol-gel method ZHU Wei-cheng(朱伟诚), PENG Dong-wen(彭东文), CHENG Jin-rong(程晋荣), MENG... were fabricated on Pt coated Si (100) substrates by sol-gel techniques with molar ratio of (Ba+Sr) to Ti changing from 0.76 to 1.33. The effect of (Ba+Sr)/Ti ratio deviating from the stoichiometry......
seen from test results. The slope of the stress-strain curve after peak value for low water-to-cement ratio is steeper than that of high water-to-cement ratio mortar. The compressive strength... of the water-to-cement ratio. The critical compressive strain increases with the strain rate.Key words:cement mortar; loading rate; compressive strength; critical strain; stress-strain behavior......
