本文選題：壓印連接　切入點：失效模式　出處：《昆明理工大學(xué)》2017年碩士論文

【摘要】：中國制造2025的提出,不僅提出對制造業(yè)實現(xiàn)數(shù)字化、網(wǎng)絡(luò)化和智能化的要求,而且在發(fā)展制造業(yè)的同時強調(diào)破解環(huán)境和資源制約,特別提到節(jié)能減排,其中節(jié)能與新能源汽車是中國制造2025十大重點領(lǐng)域之一。在探索實現(xiàn)汽車的節(jié)能減排的道路上,結(jié)構(gòu)輕量化是行之有效的方法之一。但在實現(xiàn)結(jié)構(gòu)輕量化的過程中,輕量金屬的連接技術(shù)是亟待解決的問題。近些年國內(nèi)已經(jīng)對新型板材連接技術(shù)展開研究,包括本文的研究核心:壓印連接技術(shù)。之前對于壓印連接技術(shù)的研究側(cè)重于壓印接頭的力學(xué)性能和不同材料的壓印接頭的相似與不同之處,但對于壓印接頭在失效過程中的規(guī)律和失效模式研究較少。本文主要的試驗對象為壓印接頭,通過大批量的試驗對壓印接頭的失效模式和其中規(guī)律進行分析研究。具體的研究內(nèi)容包括:1)本文根據(jù)傳統(tǒng)失效模式的定義,探究發(fā)現(xiàn)壓印接頭產(chǎn)生不同失效模式的根本原因是上板頸部強度與內(nèi)鎖強度兩種結(jié)構(gòu)強度之間的博弈。本文從傳統(tǒng)失效模式中區(qū)分出混合失效并發(fā)現(xiàn)其優(yōu)越性;2)其次,根據(jù)之前學(xué)者的相關(guān)研究并結(jié)合在試驗中的經(jīng)驗,在論文中提出壓印接頭變化的數(shù)值變量并將其命名為壓印結(jié)構(gòu)系數(shù)s,s是由頸部厚度tN和鑲嵌量tU相除得到的;3)在鍍鋅鋼同種接頭拉伸-剪切試驗結(jié)果中,根據(jù)結(jié)構(gòu)系數(shù)s的變化可預(yù)測壓印接頭的失效模式。當(dāng)s的值小于0.50時,所有接頭的失效模式均為上板頸部斷裂失效模式;當(dāng)s的值在2.35到7.00變化時出現(xiàn)的失效模式幾乎為混合失效當(dāng)s的值從8.60趨向于∞時,接頭的失效模式逐漸由混合失效向上板拉脫失效變化;出現(xiàn)頸部斷裂失效接頭個數(shù)隨s的值呈線性下降的趨勢,出現(xiàn)混合失效接頭個數(shù)隨s的值呈近似拋物線的趨勢,出現(xiàn)拉脫失效接頭個數(shù)隨s的值呈線性上升的趨勢。當(dāng)s的值為4.40時,此時壓印接頭的承載能力是最高的,當(dāng)s的值為5.70時,此時壓印接頭的能量吸收值是最高的;同時8組試驗組的承載能力和能量吸收值隨著s值增大呈現(xiàn)拋物線狀變化;4)在得到鍍鋅鋼同種壓印接頭失效過程中有關(guān)s值的規(guī)律后利用驗證組試件,對所得的規(guī)律進行驗證。驗證結(jié)果發(fā)現(xiàn),所得規(guī)律在同質(zhì)壓印接頭的DP590-DP590和SPCC-SPCC接頭得到驗證,但對于異質(zhì)接頭TA1-1420接頭規(guī)律明顯不適用;5)在動態(tài)疲勞試驗中,選取了混合失效失效模式和上板頸部斷裂失效模式的壓印接頭。發(fā)現(xiàn)結(jié)構(gòu)系數(shù)s和壓印接頭動態(tài)疲勞性能兩者存在線性關(guān)系,即隨著壓印結(jié)構(gòu)系數(shù)s的增大壓印接頭動態(tài)疲勞性能逐漸下降,在s=0.5時可取得最佳疲勞強度的鍍鋅鋼接頭。
[Abstract]:The proposal of the made in China 2025 not only puts forward the requirement of digitizing, networking and intelligentizing the manufacturing industry, but also emphasizes on solving the environmental and resource constraints while developing the manufacturing industry, with particular reference to energy saving and emission reduction.Energy-saving and new energy vehicles are made in China in 2025, one of the top ten key areas.Structural lightweight is one of the effective methods to realize energy saving and emission reduction.However, in the process of structural lightweight, the connection technology of light metal is an urgent problem to be solved.In recent years, a new type of plate bonding technology has been studied, including the core of this paper: imprint connection technology.The previous research on imprint connection technology focused on the mechanical properties of the imprint joint and the similarity and difference of the imprint joint with different materials, but there was little research on the rule and failure mode of the imprint joint during the failure process.The main test object in this paper is the imprint joint. The failure mode and the regularity of the imprint joint are analyzed and studied by mass test.In this paper, according to the definition of traditional failure mode, it is found that the fundamental reason for different failure modes of imprint joint is the game between the strength of upper plate neck and the strength of inner lock.This paper distinguishes the mixed failure from the traditional failure mode and finds its superiority. Secondly, according to the relevant research of previous scholars and combined with the experience in the experiment,In this paper, the numerical variable of the change of the imprint joint is proposed and named as the imprint structure coefficient SKS is obtained by dividing the thickness of neck t N and the amount of tu inlay) in the tensile shear test results of galvanized steel joint of the same kind.According to the change of structure coefficient s, the failure mode of imprint joint can be predicted.When the value of s is less than 0.50, the failure mode of all joints is the failure mode of neck fracture of upper plate, and the failure mode when the value of s varies from 2.35 to 7.00 is almost mixed failure when the value of s tends to 鈭，

本文編號：1723862