A new model for the life prediction of GH4133 under TMF conditions

Thermal mechanical cyclic strain tests were carried out under in-phase and out-of-phase conditions on a Nickel-base Superalloy GH4133 in the temperature range of 571-823℃. Based on analyzing the present models of TMF (thermal mechanical fatigue) life prediction, a new model for predicting nickel-base superalloy TMF lifetime was proposed.TMF life of superalloy GH4133 was calculated accurately based on the new model. Experimental TMF life has been compared with the calculatedresults and all results fall in the scatter band of 1.5. The calculating results show that the new model is not only simple, but also precise. This model will play great roles in life prediction of the metal materials and the engineering components subjected to non-isothermal service conditions.     

浅谈物理模型在解题中的应用

本文通过几个实例说明了在具体问题中建立相应物理模型的方法以及物理模型在解题中应用的重要性。     

基于CGP模型的涌现研究

涌现是复杂性理论中的一个重要概念。在讨论涌现基本概念的基础上 ,介绍了一种用于研究复杂系统涌现行为的模型方法———CGP模型 ,给出了一个CGP模型的具体例子———采集机器人的仿真模型。通过对这个模型进行仿真实验 ,观察到机器人简单的状态转换函数和看似杂乱无章的行为产生了具有明显规律性的结果 ,对这种涌现现象的产生进行了分析 ,指出了它的现实意义。     

Research on Product Information Integrating and Sharing for Dynamic Colla boration

Dynamic Collaboration emerges as the new trend of n et working and collaborating work in manufacturing industry, in which product infor mation sharing among allied enterprises plays very important roles in collaborat ing product development. This thesis aims at studying the integrating, contr olling and sharing mode of product information among the heterogeneous and dispe rsed environments through Internet, and proposes the information integrating/sha ring architecture based on the Product Master Model (P...     

双金属氧化物和氧化物载体组分间的相互作用

讨论了一些过渡金属氧化物（NiO,CuO或MoO3)在经改性所得复合载体（TiO2-γ-Al2O3，MoO3-t-ZrO2或NiO-t-ZrO2)上的分散作用，这些三地体系中实验测定的氧化物分散容量与研究负载型二元氧化物体系所得嵌入模型的估算值基本相符；样品的表面组成、结构和性能与载体的表面结构、过渡金属氧化物的负载量和加料顺序以及焙烧温度密切相关。     

向量值有限平均MDP

讨论了向量值离散时间平均准则下的有限马氏决策模型；在采取确定性平稳策略时所得马氏决策过程为遍历的假设下，证明了存在一个至多在Ｋ－１个状态是随机的平稳最优策略，并给出了其线性规划算法。同时证明了存在强最优策略的充要条件是其存在强确定性平稳最优策略。     

TP801控制凝固点降低法测定分子量

介绍用ＴＰ＿（８０１）微机控制凝固点降低法测定分子量的有关原理和技术，与传统的用贝克曼温度计测△Ｔ方法相比，扩大了测量范围，提高了精密度，工作条件得到改善．     

高应变率扭转SHB实验技术

介绍自制分离式霍布金生扭杆试验设备；详细推导出按扭转ＳＨＢ方法测量材料的动态剪应力和剪应变关系的基本方程；对软铝进行高应变率试验得到动态剪应力和剪应变关系曲线。     

The Extraction Method of Cutting Engagement in Ball-end Milling Simulation

Ball-end mill is widely used in workpiece processi ng with free-form surfaces. Such models that can predict processing character istics precisely are very necessary to the aim of cost reducing, quality improvi ng and productivity progressing, the cutting force prediction is the most import ant among these models. To explore the physical essence of metal cutting, model researchers commonly simplify the geometric conditions in cutting process, and a ssume that the geometric parameters that are needed to s...     

基于现场称重测试系统的设计与研究

依据系统结构原理，推导出数学模型，提出一种适于称重传感器测试系统的控制策略。根据该测试系统的特点，建立误差补偿模型，确定数据处理方法。 试验结果表明，整个测试系统简洁、高效、可靠；控制方案简单、易行，满足系统的性能要求；所采取的误差补偿办法切实可行， 经过处理的测试数据能够准确反映传感器测试系统的性能。