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

【摘要】：隨著社會的不斷進步,各種材料都被應用于工程建設當中,但鋼鐵材料始終占據(jù)著主要位置,其應用廣泛,需求量大,也很經(jīng)濟。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中失效很常見的一種形式。在汽車制造行業(yè)當中,汽車的輕量化已經(jīng)成為一種新的發(fā)展趨勢,對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,而且還要保證其應有足夠的強度與剛度。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人身事故和經(jīng)濟損失的重大原因,所以對材料構(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。對疲勞過程和機理以及影響疲勞強度的主要因素作了詳細闡述,重點對獲取材料疲勞性能的試驗方法進行了介紹。汽車通常在行駛時其所受的應力水平較低,經(jīng)過較久時間的積累才會引起疲勞失效。在研究汽車車身材料的疲勞性能時,采用應力與疲勞壽命之間的關(guān)系來表示其疲勞特性。本文通過對汽車車身所選沖壓鋼板進行高周疲勞試驗,試驗內(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方法》制定,試驗設備采用美國MTS Landmark電液伺服疲勞試驗機。整個疲勞試驗研究包括:材料的單向拉伸試驗,高周疲勞試驗,數(shù)據(jù)的分析,S-N曲線的擬合以及設計S-N曲線的獲取。試驗通過小樣本量中值試驗法,施加非對稱的軸向正弦波載荷,獲取材料在不同應力水平下的循環(huán)壽命,對獲取的大量試驗數(shù)據(jù)分析,通過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)計分析得到合適的設計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.
【學位授予單位】：河北工程大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U465.11;TG142.15

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