二硼化钪硬度及高压下弹性性质的第一性原理研究

用密度泛函理论的局域密度近似和广义梯度近似下赝势平面波,得到了二硼化钪的电子结构、硬度及高压下弹性性质。从电子结构上看,二硼化钪的化学键是具有共价、离子及金属键性质的混合键。得到的弹性常数（Cij）、体弹模量（B）和剪切模量（G）与其它结果进行了比较;并得出德拜温度、线性压缩率及泊松比;用布居数得出硬度。     

半空间地下结构与土相互作用的链杆法研究

根据弹性地基上的半无限平面理论,利用计算弹性地基梁的链杆法,将地基的弹性刚度矩阵与上部结构刚度矩阵相协调、综合,引进上部结构与地基土的综合刚度矩阵,解决了结构与土的相互作用问题,计算方法简单、实效。     

按全过程法确定Clough模型参数的非线性地震反应分析

不同轴压力作用下和不同配筋率以及不同物理力学指标(如钢筋强度)时的结构构件恢复力模型的特征参数值是不相同的。过去采用相同的数值进行非线性动力反应分析无法反映出结构性能受这些因素的影响。本文提出通过全过程分析求出这些参数,然后用于动力反应分析。振动台试验证明,此法合理可靠。     

空心圆管中环形片状裂纹对简谐弹性纵波的稳态响应

在弹性波理论中,对弹性波导如板、壳、柱等的研究,一直受到人们的重视.随着断裂力学的发展和应用,含裂纹的弹性波导问题引起了人们的关注.在工程实际中,人们希望得到更多的关于带裂纹的管路中弹性波传播时的某些特性,尤其是远场信息,因为它将直接为探伤技术等应用领域提供理论依据.在前文中我们讨论了其应力场在裂纹尖端附近的力学行为,在此我们将着重分析其位移场在离开裂纹时的远场特性.     

带凸凹的弹性半平面的应力状态

本文研究了带凸凹的弹性平面的应力状态,利用穆斯海里什维里的方法,获得了第一边值问题的通解,并特别讨论了σ_(x∞)σ_(y∞)τ_(xy∞)≠0的情形。     

电机控制下的一类弹性机械手系统的镇定

考察了某一类在电机控制下的机械手系统。为了抑制这类机械手的弹性弯曲振动，设计了一类电机控制，使整个闭环系统描述为一个适当的在Ｈｉｌｂｅｒｔ空间中的抽象发展方程。运用泛函分析及算子半群方法，讨论了相应的发展方程主算子的谱特征及半群性质。最后，证明了所讨论的非线性系统的解指数一致衰减到零，从而保证了弹性机械手的工作姿态到位     

A first-principles study of displacive β to ω transition in Ti-V alloys

The ground state properties of β and ω phases in Ti-(0–30 at%)V alloys were calculated, and subsequently thermodynamics and energy barriers of the displacive β to ω transition were investigated by first-principles. The results show that the lattice parameters of β and ω phases decreases with increasing V content in Ti-V alloys. The principal lattice strains for the β to ω transition are highly compositional dependent, and the volume variation decreases with increasing V content. The mechanical stability of the ω phase increases initially at the V content around 10 at% and then decreases with increasing V content. Based on the quasiharmonic Debye model, a metastable diffusionless phase diagram has been established, showing that the ω phase is thermodynamically more stable than the β phase at room temperature, anticipating a spontaneous transition from β to ω phases in Ti-V alloys. The calculations of energy pathways indicate that there is an energy barrier during the displacive βto ω transition in Ti-V alloys at temperatures from 100 to 500 K, but not at 0 K.     

关于弹性碰撞实验的研究

利用频闪摄影的记录，分析研究了高中物理中的弹性碰撞实验的误差产生原因．     

Solid solution strengthening in multicomponent fcc and bcc alloys:Analytical approach

Based on virtual solvent concept, novel methods are developed to determine interatomic distance, atomic size misfit, and elastic modulus misfit in multicomponent alloys with components having the crystal structure differing from that of the alloy. The combination of the different methods results in a number of models to calculate solid solution strengthening. These models are assessed with view point of the best fit to experimental data. The models giving the most reliable strengthening prediction can be used for an evolutionary design of strong and stable multicomponent alloys.     

基于AD1674采集弹簧的分选系统采集模块设计

弹簧弹性力测试分选系统是对大批量生产的弹簧依据其弹性系数不同,按照预先规定的指标进行测试,自动筛选出合格与不合格产品,并在不合格产品范围内依据是否可以修复将弹簧进一步细分,自动流入不同料箱,以用于不同场合。而在整个系统中,AD采集模块及采集软件的实现则是核心需要。