| 1. | The dynamic fracture and fragmentation of ofhc cu under 1 - d fast tension
一维快速拉伸下无氧铜的动态断裂与破碎 |
| 2. | Flow stress and constitutive model of ofhc cu for large deformation , different temperatures and different strain rates
不同温度和不同应变率下的流动应力和本构模型 |
| 3. | Two experimental methods were used to investigate the isentropic release properties of ofhc copper at 116 - 148 gpa and 12 , 18 . 5gpa shock compression states . off - hugoniot data have been measured and discussed in this dissertation . method i : calibrated release measurement
本文采用两种实验方法测量了无氧铜在116 148gpa和12 、 18 . 5gpa压力下的等熵卸载路径，得到了部分高压和低压区的off - hugouniot数据。 |
| 4. | Results indicate that with the approximation of _ ( 0 ) _ ( 0 ) - grtlneisen equation of state is usable to describe the release isentrope of ofhc copper in the present pressure range . in addition , the difference ( w - 2u ) becomes greater with the increase of shock pressure , where w is the measured particle velocity at the final release state ( 1 atm ) and 2u is computed from the mirror line of hugoniot
卸载路径的计算和分析表明：在所研究的压力范围，无氧铜的等熵卸载过程用gr neisen状态方程在_ 0 _ 0 =近似下的描述是适用的；卸载到一个大气压的终态粒子速度w与镜像反演的粒子速度2u的偏差，随冲击波压力的增加而增大。 |
| 5. | Light gas gun was used to create shock pressure . staged samples , cuneiform window with aluminium coat on the reflecting surface and visar ( velocity interferometer system for any reflector ) were employed in the experiments . polymethyl methacrylate and ofhc copper were assembled as the impactor to impact staged samples
采用气炮加载，利用台阶样品、双点式visar ( velocityinterferometersystemforanyreflector )和镀膜楔形窗口技术，以有机玻璃和无氧铜组合为飞片，碰撞无氧铜台阶样品。 |
| 6. | Lagrange wave speed in the release process was computed from the measurement , and result shows a good agreement with the data in literature . furthermore from the lagrange wave speed , the stress - strain relationship in the release process was calculated using the impedance match solution . comparison of the stress - strain with the fluid elastic - plastic model indicates that ofhc copper exhibits a clear work - harden behavior during the release
根据界面粒子速度剖面，计算得到了卸载过程中lagrange声速随界面粒子速度变化的关系，所得结果与文献给出的数据符合很好；其次，利用阻抗匹配近似，计算分析了无氧铜卸载过程的应力-应变关系，并与流体弹塑性模型进行了比较，结果表明：无氧铜的卸载过程存在明显的应变硬化效应。 |
| 7. | Numerical simulation also conf irm this analysis that the fluid elastic - plastic model can approximately describe the shock compression and release process of ofhc copper in the teens gpa range , but for precise description , especially in the initial release stage , more detail constitutive model is needed
数值计算结果也支持了这种分析：在十几个gpa的压力范围，无氧铜的冲击加载-卸载过程近似满足流体弹塑性模型，但在精确描述，尤其对初始卸载阶段的描述上，仍需要更准确的本构方程和物理模型。 |
| 8. | Our focus and our direction is to become the most customer - friendly , low cost provider of high quality copper and copper alloy products while generating an above average return on investment for our owners . oxygen - free high conductivity copper is produced by the direct conversion of selected refined cathodes and castings under carefully controlled conditions to prevent any contamination of the pure oxygen - free metal during processing . the method of producing ofhc
江铜铜材有限公司可以生产各类品种规格的铜及铜合金产品，公司的主导产品-无氧银铜合金材料和银铜合金异型排，广泛应用于家电汽摩配电动工具等产品的各种电机换向器，该产品生产历史悠久，技术先进，质量可靠，深得用户好评，市场占有率在国内名列前茅，并逐年上升。 |
| 9. | High energy explosive was used to create a powerful and planar shock wave for accelerating flyer plate to high velocity , and high pressure was produced when flyer impacting with the sample . in the experiments , the impactor was brass and target was ofhc copper . by measuring the shock wave velocities of hr2 steel , high - density glass , aluminium alloy ( ly12 / lf6 ) , magnesium - aluminium alloy ( mb2 ) , polymethyl methacrylate and air , shock pressure and release isentrope of ofhc copper have been obtained
采用化爆加载、平面波发生器和空腔增压技术，以黄铜为飞片，无氧铜为靶板，测量了抗氢钢( hr2 ) 、重玻璃( sio _ 2 ) 、铝合金( ly12 lf6 ) 、镁铝合金( mb2 ) 、有机玻璃( pmma ) 、空气( air )和无氧铜( ofhccopper )各阻抗匹配样品中的冲击波速度，上述材料的hugoniot状态参数c _ 0 、均为已知，由此确定了无氧铜的冲击加载压力和等熵卸载后的状态，得到了等熵卸载路径。 |
