平均纯变形抗力模型

本文提供了一种用单位纯变形能建立平均纯变形抗力模型的方法。

凤城白云金矿早前寒武纪变质岩系应变的环境条件分析

根据辽宁凤城白云金矿地区辽河群岩石的变质相,运用金属物理学和流变学的理论,以数学方法分析了早前寒武纪角闪岩相为主条件下岩石的流变行为。有关计算结果表明,变形的比温度值(T/Tm)较高,普遍达0.7以上,差异应力值较低,为(7—20)×10~6Pa,应变率小,一般小于10^(-13)/s,这是一种稳态流变过程。数学推导表明,这种流变体服从于牛顿定律,并由此计算了本区变形岩石的等效粘滞度。

辽宁四道沟金矿床的脉动构造

辽宁四道沟金矿床内直接控制矿化的主要为一系列不规则的小型微型裂隙,这些控矿裂隙形成于叠加褶曲作用晚期,是一种脉动构造。叠加褶曲轴都是脉动构造发育的良好地段。根据流体包裹体特征,可将脉动作用划分为四个阶段,表明了成矿的多阶段性。

辽宁凤城白云金矿区早前寒武纪地体流变学参数推导初试

本文运用金属物理学和流变学理论,分析了辽宁凤城白云金矿早前寒武纪地体的应变特征.有关计算结果表明:区内岩石变形时的比温度值高,一般均>0.7,差异应力值低,约为(70～200)×10~5Pa 应变率也低,约为1.01×10^(-12.9)～5.67×10^(-16.5)/s.这种流变体服从于牛顿定律,并计算出等效粘滞系数为7.39×10^(18.9)～1.23×10^(22.5),本区岩石的变形过程是一种稳态流变过程.

Deformation division of metal flow behavior during extrusion process of 7075 aluminum alloy

To reduce defects caused by non-homogeneous metal flow in conventional extrusion,a die with guiding angle was designed to improve the metal flow behavior. The characteristic quantities such as the second invariant of the deviator stress J2 and Lode's coefficient μ were employed for the division of deformation area. The results show that when the metal is extruded with the guiding angle,no metal flow interface forms at the container's bottom,the dead zone completely disappears,the deformation types of the metal in the plastic deformation area change from three types to one type of tension,and the homogeneity of the deformation as well as metal flow are greatly improved. The non-homogeneous metal flow at the final stage of extrusion is improved,reducing the shrinkage hole at the axis end. The radial stress of the furthest point from the axis is transformed from tensile stress to compressive stress and the axial stress,and decreased from 70.8 to 34.8 MPa. Therefore,the surface cracks caused by additional stress are greatly reduced.