摘要
轴向压缩(拉伸)变形实验是测量岩石力学机制参数和模拟岩石变形过程中显微织构演化的主要手段。Paterson气体介质高温高压流变仪可以完成应力测量精度高(±0.1MPa)的轴向压缩(拉伸)变形实验,是模拟研究中、下地壳岩石流变行为的最佳仪器。由于样品组装中采用的活塞发生变形、封套铁筒承担部分加载力和样品截面积随压缩变形增大等因素,我们从仪器记录的数据文件计算出来的应力、应变数据被称为名义应力和名义应变,均与真实值之间存在误差。因此必须针对每一个造成误差的因素进行逐步校正,方能获得真实应力和真实应变数据。因此撰写本文,逐步介绍针对上述要素的三种校正:样品变形量校正、强度校正和截面积校正。以便于促进大家对Paterson气体介质高温高压流变仪的实验方法了解,更好地利用Paterson气体介质高温高压流变仪进行构造变形研究。另外以部分大理岩数据为例演示校正过程并讨论每步校正前后相应因素造成误差的大小。
The axial compression （or extension） testing has been a major method for studying the mechanical prop- erties and mierostrueture evolution of rocks during their deformation processes. The Paterson-type gas medium high- pressure high-temperature （HPT） machine is the state of art apparatus for the axial deformation testing of the mid- dle-lower crustal rocks, due to its high precision in stress measuring （ ±0.1 MPa）. However, during the rock de- formation testing, the piston will be deformed accordingly, the iron jacket will support part of the load force, and the cross-section of sample will increase, therefore, the stress and strain calculated from recorded data of HPT should be nominal stress and nominal strain, which deviate from the true stress and strain. Thus, corrections corre- sponding to each factor causing errors must be carried out. In this paper, three corrections, those are sample distor- tion correction, strength correction and cross-section correction, are introduced, to make domestic scholars get fa- miliar with the HPT machine. Then we can accomplish much more structural deformation studies. In addition, the marble axial deformation data are chosen as example to show the correction steps and the deviation before and after each calibration.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2013年第1期127-137,共11页
Geotectonica et Metallogenia
基金
国家自然科学基金项目(批准号:41102139和41174072)资助
关键词
Paterson气体介质高温高压流变仪
轴向压缩变形
数据校正
Paterson-type gas medium high-pressure high-temperature machine （HPT）
axial deformation testing
data calibration
