本文選題：薄膜伸張模型 + 小沖桿蠕變試驗　； 參考：《華東理工大學(xué)》2015年碩士論文

【摘要】：小沖桿蠕變試驗方法,是微試樣測試的一種,兼具無損和取樣方便的優(yōu)勢,應(yīng)用在電力、航空航天和化工等領(lǐng)域,對材料高溫蠕變性能進行測試,具有巨大的優(yōu)勢和潛力。本研究基于小沖桿方法研究材料的蠕變問題,主要進行三方面的工作：一、基于薄膜伸張理論,建立小沖桿蠕變的簡化模型,通過幾何計算將小沖桿蠕變試驗得到的撓度值轉(zhuǎn)化為等效蠕變應(yīng)變,并將試驗載荷轉(zhuǎn)化為等效蠕變應(yīng)力,從而建立完全基于小沖桿試驗的測試材料高溫蠕變性能的方法；二、對小沖桿試驗裝置進行優(yōu)化,進行小沖桿蠕變試驗和單軸蠕變試驗,并將兩者得到的結(jié)果進行對比,得到P91材料的小沖桿蠕變Norton方程；三、進行1.25Cr0.5MoSi材料的小沖桿蠕變試驗和單軸蠕變持久試驗,建立Monkman-Grant壽命預(yù)測模型,并比較分析兩者得到的結(jié)果。通過對以上內(nèi)容的研究,可以得到如下結(jié)論：(1)獲得了基于小沖桿試驗的評定材料高溫蠕變性能的方法,并能夠與單軸蠕變持久試驗進行關(guān)聯(lián)比較；(2)基于P91材料566℃的小沖桿蠕變試驗結(jié)果,獲得其不同試驗載荷轉(zhuǎn)化成的等效蠕變應(yīng)力以及對應(yīng)的最小等效蠕變應(yīng)變速率,在此基礎(chǔ)上建立小沖桿Norton蠕變方程,證明小沖桿方法能夠評定材料的蠕變變形性能；(3)獲得1.25Cr0.5MoSi材料在550℃下的小沖桿蠕變的壽命預(yù)測模型,說明小沖桿方法能夠用來預(yù)測材料的剩余壽命。
[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，

本文編號：2032055