小冲杆蠕变与单轴蠕变试验蠕变变形参数的对比研究

发布时间：2018-06-17 18:38

  本文选题：薄膜伸张模型 + 小冲杆蠕变试验　； 参考：《华东理工大学》2015年硕士论文

【摘要】：小冲杆蠕变试验方法,是微试样测试的一种,兼具无损和取样方便的优势,应用在电力、航空航天和化工等领域,对材料高温蠕变性能进行测试,具有巨大的优势和潜力。本研究基于小冲杆方法研究材料的蠕变问题,主要进行三方面的工作：一、基于薄膜伸张理论,建立小冲杆蠕变的简化模型,通过几何计算将小冲杆蠕变试验得到的挠度值转化为等效蠕变应变,并将试验载荷转化为等效蠕变应力,从而建立完全基于小冲杆试验的测试材料高温蠕变性能的方法；二、对小冲杆试验装置进行优化,进行小冲杆蠕变试验和单轴蠕变试验,并将两者得到的结果进行对比,得到P91材料的小冲杆蠕变Norton方程；三、进行1.25Cr0.5MoSi材料的小冲杆蠕变试验和单轴蠕变持久试验,建立Monkman-Grant寿命预测模型,并比较分析两者得到的结果。通过对以上内容的研究,可以得到如下结论：(1)获得了基于小冲杆试验的评定材料高温蠕变性能的方法,并能够与单轴蠕变持久试验进行关联比较；(2)基于P91材料566℃的小冲杆蠕变试验结果,获得其不同试验载荷转化成的等效蠕变应力以及对应的最小等效蠕变应变速率,在此基础上建立小冲杆Norton蠕变方程,证明小冲杆方法能够评定材料的蠕变变形性能；(3)获得1.25Cr0.5MoSi材料在550℃下的小冲杆蠕变的寿命预测模型,说明小冲杆方法能够用来预测材料的剩余寿命。
[Abstract]:The creep test method of small impact rod is a kind of micro-specimen test, which has the advantages of nondestructive and convenient sampling. It is used in electric power, aerospace, chemical engineering and other fields to test the creep properties of materials at high temperature, which has great advantages and potential. In this paper, the creep problem of material is studied based on the method of small punching rod. The main work is as follows: first, based on the theory of thin film stretching, a simplified model of creep of small punch rod is established. The deflection value obtained from creep test of small punch rod is transformed into equivalent creep strain by geometric calculation, and the test load is transformed into equivalent creep stress, thus a method of testing material creep performance at high temperature based on small punch bar test is established. This paper optimizes the test equipment of small punch rod, carries out creep test of small punch rod and uniaxial creep test, and compares the results obtained by the two methods, and obtains the Norton equation of creep of small punch rod of P91 material. The creep test and uniaxial creep rupture test of 1.25Cr0.5MoSi material were carried out, and Monkman-Grant life prediction model was established, and the results were compared and analyzed. Through the above research, we can get the following conclusion: 1) the method of evaluating the creep properties of materials at high temperature based on the small impact bar test is obtained, and it can be compared with the uniaxial creep rupture test. Based on the creep test results at 566 鈩，

本文编号：2032055