通过Gleeble 3500热压缩试验机对AZ31镁合金进行热压缩实验,得到温度为300、350、400、450和500℃,应变速率为0.03、0.3、和3 s 1的流变应力曲线。对流变应力曲线进行图形变换求解出不同应变速率下的回复参数r,求得的回复参数的自然对数...通过Gleeble 3500热压缩试验机对AZ31镁合金进行热压缩实验,得到温度为300、350、400、450和500℃,应变速率为0.03、0.3、和3 s 1的流变应力曲线。对流变应力曲线进行图形变换求解出不同应变速率下的回复参数r,求得的回复参数的自然对数lnr与温度的倒数1/T成线性相关。结果表明:可以采用修正的Laasraoui-Jonas(L-J)位错密度模型计算AZ31镁合金动态再结晶过程中的位错密度演变;修正的L-J位错密度模型结合元胞自动机(CA)能精确地模拟位错密度动态再结晶过程。展开更多
Using dislocation model of seismic deformation and the hybrid global inversion method, we analyze the 1990-1995 annually GPS data from 89 stations in southern Taiwan and its neighboring area and discuss the origin of ...Using dislocation model of seismic deformation and the hybrid global inversion method, we analyze the 1990-1995 annually GPS data from 89 stations in southern Taiwan and its neighboring area and discuss the origin of the observed deformation field. Based on the geologic investigation and seismic observation we simply assume six blocks and nineteen fault patches in the studied area. The results show that the Philippine Sea plate moves, relative to the Eurasian plate, at a velocity (69±2)mm/a in 317°±2°. About a half of the rate is concentrated on the Longitudinal Valley fault (LVF), and the other half of the convergence spread over the boundaries among the west blocks. The Philippine Sea plate and the Central Range move toward northwestward. In the west of the Central Range zone, the motion of the blocks accords with the observed fan-shape distribution of the maximum principal stress. The faults between the Western Foothills and the Coastal Plain geological provinces have main thrust components, and the dips turn small from south to north. The fault widths are about 10km, implying that they are strongly locked, and most of the large historical earthquakes occurred here.展开更多
文摘通过Gleeble 3500热压缩试验机对AZ31镁合金进行热压缩实验,得到温度为300、350、400、450和500℃,应变速率为0.03、0.3、和3 s 1的流变应力曲线。对流变应力曲线进行图形变换求解出不同应变速率下的回复参数r,求得的回复参数的自然对数lnr与温度的倒数1/T成线性相关。结果表明:可以采用修正的Laasraoui-Jonas(L-J)位错密度模型计算AZ31镁合金动态再结晶过程中的位错密度演变;修正的L-J位错密度模型结合元胞自动机(CA)能精确地模拟位错密度动态再结晶过程。
文摘Using dislocation model of seismic deformation and the hybrid global inversion method, we analyze the 1990-1995 annually GPS data from 89 stations in southern Taiwan and its neighboring area and discuss the origin of the observed deformation field. Based on the geologic investigation and seismic observation we simply assume six blocks and nineteen fault patches in the studied area. The results show that the Philippine Sea plate moves, relative to the Eurasian plate, at a velocity (69±2)mm/a in 317°±2°. About a half of the rate is concentrated on the Longitudinal Valley fault (LVF), and the other half of the convergence spread over the boundaries among the west blocks. The Philippine Sea plate and the Central Range move toward northwestward. In the west of the Central Range zone, the motion of the blocks accords with the observed fan-shape distribution of the maximum principal stress. The faults between the Western Foothills and the Coastal Plain geological provinces have main thrust components, and the dips turn small from south to north. The fault widths are about 10km, implying that they are strongly locked, and most of the large historical earthquakes occurred here.
