不同加载压力下平面对顶砧间叶蜡石封垫力学状态的演变  

Evolution of the Mechanical Behavior of Pyrophyllite Gasket between Flat Anvils under Different Loading Pressures

作　　者：胡云[1,2] 陈丽英[1,3] 刘秀茹[1] 彭小娟[1,4] 苏磊[1,5] 洪时明[1] 

机构地区：[1]西南交通大学物理科学与技术学院,材料先进技术教育部重点实验室,四川成都610031 [2]成都信息工程学院光电技术学院,四川成都610225 [3]武汉理工大学物理系,湖北武汉430070 [4]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,四川绵阳621999 [5]郑州轻工业学院技术物理系,河南郑州450002

出　　处：《高压物理学报》2015年第6期401-409,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(10299040,11004163)

摘　　要：以Wakatsuki提出的恒定加载压力下封垫的压缩模型为基础,采用直径20mm的硬质合金平面对顶压砧,测量了不同外部加载压力下叶蜡石封垫的临界厚度、弹性区半径以及回弹率等数据;结合对中心压力的标定,以及对回收封垫的图像处理分析和相关计算,给出了封垫内弹性区和塑性区的压力分布随外加压力变化的规律,并估算了准静水压区范围。实验表明:平面对顶压砧间封垫塑性区内的剪切强度随压力提高而增加,中心的压力随外加压力的提高而增加,其增加的比率具有逐渐上升的特点。On the basis of the compressible gasket model presented by Wakatsuki,we investigated the squeezing behavior of a pyrophyllite gasket using a Bridgman type high pressure apparatus with an anvil top diameter of 20 mm. A series of data including the critical thickness, the elastic region diame- ter,the compression spring-hack rate etc. , were measured under different loading forces. Combining with the pressure calibration at the center of the gasket, the image-analysis＇of recovered discs and related calculations, we described the evolution of the mechanical state and pressure distribution in the elastic and plastic regions of gasket along with the increase of the loading force, and then estimated the region of quasi-hydrostatic pressure in the gasket. The experimental results show that the increase rate of the center pressure with the loading force shows an upward trendency, which is a feature of the Bridgman anvils.

关 键 词：平面对顶压砧 叶蜡石封垫 剪切强度 压力分布 

分 类 号：O344.3[理学—固体力学]