六面顶压机立方压腔内压强的定量测量及受力分析

发布时间：2018-04-12 00:30

本文选题：高压技术 + 立方压腔　；参考：《物理学报》2017年09期

【摘要】：将六面顶压机立方压腔内置入电路,采用原位电阻测量确定Bi,Tl,Ba相变的方法,标定了压腔内不同位置的压力(强).通过标定立方压腔顶锤表面的压力并结合计算,分别得到了外部加载与压腔密封边受力以及合成腔体受力的对应关系.实验分析结果表明,随着外部加载的增加,当腔体压力达到5 GPa时,消耗在压腔密封边上的加载急剧上升,消耗在合成腔体的加载趋于不变,从而导致立方压腔压力达到上限.利用实验结果,分析了立方压腔在高压下的受力状态,解释了立方压腔的压力难以超过7 GPa的原因.结合立方压腔的几何结构,通过理论分析,提出了采用高体弹模量的物质作为传压介质,同时采用低体弹模量的物质作为密封边提高立方压腔压力上限的可行方案.通过定量标定叶腊石压腔轴向的压力梯度,给出了压腔内沿对称轴不同位置压力值的计算方法,此方法可为高压实验提供更精确的压力数据.
[Abstract]:In this paper, the cubic pressure chamber of the hexahedral top press is placed in the circuit, and the in-situ resistance measurement is used to determine the phase transition of Bi-T _ (ln) Ba, and the pressure at different positions in the cavity is calibrated.By calibrating the pressure on the surface of the cuboidal chamber top hammer and combining with the calculation, the corresponding relations between the external loading and the sealing edge of the chamber and the force on the composite cavity are obtained respectively.The experimental results show that, with the increase of external loading, when the pressure of the cavity reaches 5 GPa, the load consumed on the edge of the chamber seal increases sharply, and the load consumed in the composite cavity tends to remain constant, resulting in the pressure of the cubic chamber reaching the upper limit.Based on the experimental results, the stress state of the cubic pressure cavity under high pressure is analyzed, and the reason why the pressure of the cubic pressure cavity is difficult to exceed 7 GPa is explained.Based on the geometric structure of the cubic cavity and theoretical analysis, a feasible scheme is proposed to increase the upper pressure limit of the cubic chamber by using the material with high bulk elastic modulus as the pressure transfer medium and the material with low bulk elastic modulus as the sealing edge.By quantificationally calibrating the axial pressure gradient of the pyrophyllite cavity, a method for calculating the pressure values at different positions along the symmetry axis in the cavity is presented. This method can provide more accurate pressure data for the high pressure experiment.
【作者单位】：河南工业大学材料科学与工程学院材料压处理研究所;四川大学原子与分子物理研究所高压科学与技术实验室;武汉科技大学理学院;
【基金】：国家自然科学基金青年基金(批准号:11504087,51502217) 河南省教育厅自然科学项目(批准号:14A430033) 河南工业大学科技创新人才项目(批准号:2014CXRC08)资助的课题~~
【分类号】：TH49

【相似文献】