微型圆片试样液压爆破法测试压力容器用钢强度性能的研究

发布时间：2018-02-27 07:27

本文关键词： 微型圆片试样液压爆破 16MnR 屈服强度　出处：《华东理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：“微型圆片试样液压爆破法”是一种新型微试样力学性能测试方法。该方法是通过对圆形薄片试样进行液压加压,使圆薄片鼓胀并爆破,在试验过程中记录圆形薄片中心点的载荷-位移曲线,通过曲线上的特征载荷关联材料强度。前人的相关研究给出了基于该种微小试样实验关联材料屈服强度及抗拉强度的经验公式。本文通过实验发现：之前学者提出的屈服强度经验公式在关联具有长屈服平台的16MnR钢的屈服强度时出现了较大偏差。本文的主要研究内容及成果如下： (1)针对微型圆片试样的加工难题以及原有试验装置的不足,自主设计了微型圆片试样的精加工装置,提高了微型圆片试样的加工效率和加工精度。改进了原试验装置中位移信号的采集方式,减小位移采集对试样变形的影响。 (2)通过对微型圆片试样液压爆破实验过程中的压力-位移曲线屈服特征载荷的研究,提出了以极顶位移100μm为参量确定结构屈服特征载荷Py100,并通过解析公式估算材料屈服强度的方法。实验证明了该方法能较好地预测16MnR钢、A508钢和S30408钢等压力容器用钢的屈服强度。 (3)借助有限元模拟方法分析了极顶位移为100μm时微型圆片试样的应力、应变及变形情况,研究了压环圆角半径对微型圆片试样屈服特征载荷以及爆破压力的影响规律；通过研究材料屈服平台长度对微型圆片试样压力-位移曲线影响发现,屈服平台的长短对微型圆片试样的屈服特征载荷Py100基本没有影响。
[Abstract]:The "hydraulic blasting method of microdisk specimen" is a new method for testing the mechanical properties of microspecimen. The method is to inflate and blast the circular wafer by hydraulic pressure on the circular sheet specimen. The load-displacement curve of the central point of the circular sheet was recorded during the test. The empirical formulas for the yield strength and tensile strength of the material based on the experimental correlation of this kind of micro-specimen are given by the previous studies. The empirical formula for yield strength of 16MnR steel with long yield platform has a large deviation. The main contents and achievements of this paper are as follows:. (1) aiming at the difficulties in the processing of micro wafer samples and the deficiency of the original test equipment, the finishing device for micro wafer samples is designed independently. The processing efficiency and machining precision of the micro wafer specimen are improved, and the acquisition method of displacement signal in the original test device is improved, so as to reduce the influence of displacement acquisition on specimen deformation. (2) by studying the yield characteristic load of the pressure displacement curve during the hydraulic blasting experiment of the miniature circular specimen, A method for determining the structural yield characteristic load Py100 with the polar top displacement of 100 渭 m as a parameter is proposed, and the yield strength of the material is estimated by analytical formula. The experimental results show that the method can predict the yield strength of pressure vessel steels such as 16MnR steel A508 and S30408 steel. (3) the stress, strain and deformation of miniature disk specimen with polar top displacement of 100 渭 m are analyzed by means of finite element simulation method. The influence of corner radius of pressure ring on the yield characteristic load and blasting pressure of miniature disc specimen is studied. By studying the effect of material yield platform length on the pressure-displacement curve of micro-circular specimens, it is found that the length of yield platform has little effect on the yield characteristic load Py100 of micro-wafer specimens.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TH49;TG142.15

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