發(fā)布時(shí)間：2018-07-12 18:19

  本文選題：車身沖壓鋼板 + 單向拉伸試驗(yàn)　； 參考：《河北工程大學(xué)》2017年碩士論文

【摘要】：隨著社會(huì)的不斷進(jìn)步,各種材料都被應(yīng)用于工程建設(shè)當(dāng)中,但鋼鐵材料始終占據(jù)著主要位置,其應(yīng)用廣泛,需求量大,也很經(jīng)濟(jì)。但所有材料都避免不了破壞失效,而疲勞破壞是工程材料當(dāng)中失效很常見(jiàn)的一種形式。在汽車制造行業(yè)當(dāng)中,汽車的輕量化已經(jīng)成為一種新的發(fā)展趨勢(shì),對(duì)選用的制造材料變得很關(guān)鍵,不僅要可以滿足汽車的輕量化要求,而且還要保證其應(yīng)有足夠的強(qiáng)度與剛度。除汽車行業(yè),包括其他工程領(lǐng)域,疲勞破壞已然成為一種帶來(lái)人身事故和經(jīng)濟(jì)損失的重大原因,所以對(duì)材料構(gòu)件的疲勞耐久性成為必須要考慮的因素。本文介紹了汽車車身常用鋼材的種類,以及其疲勞耐久性能的研究現(xiàn)狀。對(duì)疲勞過(guò)程和機(jī)理以及影響疲勞強(qiáng)度的主要因素作了詳細(xì)闡述,重點(diǎn)對(duì)獲取材料疲勞性能的試驗(yàn)方法進(jìn)行了介紹。汽車通常在行駛時(shí)其所受的應(yīng)力水平較低,經(jīng)過(guò)較久時(shí)間的積累才會(huì)引起疲勞失效。在研究汽車車身材料的疲勞性能時(shí),采用應(yīng)力與疲勞壽命之間的關(guān)系來(lái)表示其疲勞特性。本文通過(guò)對(duì)汽車車身所選沖壓鋼板進(jìn)行高周疲勞試驗(yàn),試驗(yàn)內(nèi)容及方法按照GB/T 26076—2010《金屬薄板(帶)軸向力控制疲勞試驗(yàn)方法》制定,試驗(yàn)設(shè)備采用美國(guó)MTS Landmark電液伺服疲勞試驗(yàn)機(jī)。整個(gè)疲勞試驗(yàn)研究包括:材料的單向拉伸試驗(yàn),高周疲勞試驗(yàn),數(shù)據(jù)的分析,S-N曲線的擬合以及設(shè)計(jì)S-N曲線的獲取。試驗(yàn)通過(guò)小樣本量中值試驗(yàn)法,施加非對(duì)稱的軸向正弦波載荷,獲取材料在不同應(yīng)力水平下的循環(huán)壽命,對(duì)獲取的大量試驗(yàn)數(shù)據(jù)分析,通過(guò)最小二乘法擬合曲線,得到疲勞極限。由于數(shù)據(jù)存在的分散性,選擇合適的置信區(qū)間,統(tǒng)計(jì)分析得到合適的設(shè)計(jì)S-N曲線。
[Abstract]:With the development of society, all kinds of materials have been used in engineering construction, but the steel material has always occupied the main position, its application is extensive, the demand is large, and it is also very economical. But all materials can not avoid failure, and fatigue failure is a common form of failure in engineering materials. In the automobile manufacturing industry, the lightweight of the automobile has become a new development trend, which is very important to the selected manufacturing materials, not only to meet the lightweight requirements of the automobile, but also to ensure that it should have sufficient strength and stiffness. In addition to automobile industry, including other engineering fields, fatigue damage has become a major cause of personal accidents and economic losses, so the fatigue durability of material components must be considered. This paper introduces the kinds of steel used in automobile body and the research status of its fatigue durability. The fatigue process and mechanism as well as the main factors affecting fatigue strength are described in detail, and the test methods for obtaining fatigue properties of materials are introduced emphatically. The stress level of a vehicle is usually low when it is driven, and fatigue failure will only occur after a long time accumulation. The relationship between stress and fatigue life is used to express the fatigue characteristics of automobile body materials. In this paper, the high cycle fatigue test of stamping steel plate selected for automobile body is carried out, and the test contents and methods are formulated according to GB/ T26076-2010 < method of axial force control fatigue test for sheet metal (belt). MTS Landmark electro-hydraulic servo fatigue testing machine is used in the test equipment. The whole fatigue test includes uniaxial tensile test, high cycle fatigue test, analysis of data, fitting of S-N curve and acquisition of design S-N curve. The cyclic life of materials under different stress levels is obtained by applying asymmetric axial sinusoidal load through the method of small sample size median test. A large number of test data obtained are analyzed and the curve is fitted by the least square method. The fatigue limit is obtained. Due to the dispersion of the data, a suitable design S-N curve is obtained by statistical analysis by selecting the appropriate confidence interval.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U465.11;TG142.15

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