本文選題：關(guān)聯(lián)系數(shù)　切入點(diǎn)：小沖桿蠕變測(cè)試　出處：《華東理工大學(xué)》2017年碩士論文

【摘要】：高溫服役設(shè)備的力學(xué)性能評(píng)估及剩余壽命預(yù)測(cè)對(duì)保障運(yùn)行安全、降低人員傷害和減小經(jīng)濟(jì)損失具有重要意義。小沖桿蠕變測(cè)試技術(shù)作為一種微損測(cè)試方法可以對(duì)設(shè)備本身微損取樣而不需要修復(fù),因而被認(rèn)為是一種最具應(yīng)用前景的測(cè)試方法。目前科學(xué)研究與工程設(shè)計(jì)都使用常規(guī)試驗(yàn)方法來獲得材料的蠕變力學(xué)性能,怎樣使得小沖桿蠕變測(cè)試方法獲得的材料蠕變性能具有和常規(guī)蠕變?cè)囼?yàn)結(jié)果一樣的參考價(jià)值是研究的重點(diǎn)。2006年,歐洲標(biāo)準(zhǔn)委員會(huì)推出小沖桿蠕變測(cè)試標(biāo)準(zhǔn),其中小沖桿蠕變關(guān)聯(lián)系數(shù)被首次引入并用來關(guān)聯(lián)小沖桿蠕變與單軸蠕變性能數(shù)據(jù)。作者通過研究關(guān)聯(lián)系數(shù)Ksp對(duì)小沖桿蠕變與單軸拉伸蠕變的關(guān)系進(jìn)行了探索,通過進(jìn)行不同應(yīng)力狀態(tài)下的小沖桿蠕變?cè)囼?yàn)與單軸蠕變?cè)囼?yàn),選用諾頓方程和多恩公式等蠕變模型來對(duì)Kp值進(jìn)行研究。同時(shí),對(duì)于獲得的16Mo3蠕變斷裂壽命數(shù)據(jù),基于Monkman-Grant與Larson-Miller等預(yù)測(cè)模型,構(gòu)建了小沖桿蠕變的斷裂壽命與載荷的關(guān)系,并與同條件下單軸拉伸壽命預(yù)測(cè)進(jìn)行了對(duì)比。論文主要獲得如下結(jié)果:1)提出了一種獲得小沖桿蠕變與單軸蠕變關(guān)聯(lián)系數(shù)的方法,該方法與之前研究學(xué)者常用的方法相比具有更好的實(shí)際操作性。2)對(duì)于三種高溫材料,通過實(shí)驗(yàn)獲得了不同的Ksp值。根據(jù)獲得的這個(gè)關(guān)聯(lián)系數(shù),可以直接將小沖桿蠕變?cè)囼?yàn)結(jié)果向單軸轉(zhuǎn)化。3)建立了小沖桿蠕變的Monkman-Grant與Larson-Miller壽命預(yù)測(cè)模型。通過比較小沖桿蠕變與單軸蠕變的Monkman-Grant壽命預(yù)測(cè)模型,分析了影響兩者壽命預(yù)測(cè)精度的因素。
[Abstract]:The evaluation of mechanical properties and the prediction of residual life of high temperature service equipment are of great significance to ensure the safety of operation, reduce the injury of personnel and reduce the economic loss.As a micro-damage testing method, small impact bar creep testing technique is considered to be the most promising test method because it can be used to sample the micro-damage of the equipment without the need of repair.At present, both scientific research and engineering design use conventional test methods to obtain creep mechanical properties of materials.How to make the creep properties of the materials obtained by the creep test method of small punch rod have the same reference value as the results of the conventional creep tests is the key point of the study. In 2006, the European Committee of Standards introduced the creep test standard of small punch rod.Among them, the creep correlation coefficient of small punch bar is introduced for the first time and used to correlate the creep and uniaxial creep performance data of small punch rod.The relationship between creep of small punch rod and uniaxial tensile creep was studied by means of correlation coefficient Ksp. Creep tests of small punch rod and uniaxial creep test were carried out under different stress states.The creep models such as Norton equation and Dorne formula are used to study the value of Kp.At the same time, based on Monkman-Grant and Larson-Miller prediction models, the relationship between creep life and load of small impact bar is constructed and compared with the tensile life prediction of order shaft issued under the same condition for the obtained 16Mo3 creep fracture life data.In this paper, the following results are obtained: (1) A method to obtain the correlation coefficient between creep and uniaxial creep of small punching rod is proposed. This method has better practical operation than the previous methods commonly used by scholars) for three kinds of high temperature materials.Different Ksp values were obtained through experiments.According to the correlation coefficient obtained, the creep test results of small punch bar can be directly transformed to uniaxial. 3) the Monkman-Grant and Larson-Miller life prediction models of small punch rod creep can be established.By comparing the Monkman-Grant life prediction model of small impact rod creep and uniaxial creep, the factors that affect the accuracy of the two life prediction are analyzed.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB302.3

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