铝锂合金T型自冲铆接头静力与疲劳性能研究

发布时间：2018-03-18 02:14

本文选题：铝锂合金　切入点：T型自冲铆接头　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：自冲铆接技术作为一种冷成型的方法其工程应用极其广泛。本论文选择自冲铆接技术为研究对象,以现今发展潜力巨大的铝锂合金1420、8090及钛合金TA1为主要连接基板,对其T型自冲铆接性能进行研究。文中具体工作可以分以下几个方面。以1420铝锂合金T型自冲铆接头为主要研究对象,借助铝锂合金1420同种搭接及其与铜合金H62、不锈钢410异种搭接的方式详细地介绍了T型接头的制备过程,并通过拉伸-剥离试验对接头在剥离过程中的静强度、能量吸收、失效形式及其机理进行了比较分析。另外,还设置了一组铝锂合金1420单搭接头进行相关的比较分析。在拉-拉循环加载下对上述三组T型自冲铆接头进行疲劳试验,获得这三组接头的疲劳寿命曲线等信息并分析三组接头的疲劳强度。文章还通过宏观与微观两个层面对接头的失效形式及其机理作了详细的分析。疲劳断口宏观分析表明随着加载降低,接头薄弱环节有由铆钉向板材转移的趋势。断口微观分析结果表明裂纹萌生区为较平坦的准解理,裂纹瞬断区为较突出的沿晶或韧窝特征。对微动的研究发现其跟所受载荷、材料组合、材料性能和内应力有关。以铝锂合金8090同种及其与铜合金H62、钛合金TA1异种组合的T型自冲铆接头为主要研究对象,对该组接头的力学性能、能量吸收性能及相关失效形式进行分析。制作8090铝锂合金与镀锌钢正反组合的T型接头,以分析铆钉不同刺穿方向对接头力学性能及失效形式的影响。为了研究自冲铆-粘接复合连接技术在T型结构中的应用,本文还对8090铝锂合金的自冲铆-粘接复合连接的接头成形质量、力学性能与粘接剂、板材组合及模具的关系进行研究。为拓展T型自冲铆接头的材料应用领域,本文还针对钛合金TA1的T型自冲铆接头进行了相关研究。
[Abstract]:Self-punching riveting technology is widely used in engineering as a kind of cold forming method. In this paper, self-punching riveting technology is chosen as the research object, taking the Al-Li alloy 1420 / 8090 and titanium alloy TA1 as the main connection substrate, which has great development potential nowadays. The performance of T-type self-punching riveting is studied. The concrete work in this paper can be divided into the following aspects. Taking 1420 Al-Li alloy T-type self-punching riveting head as the main research object, With the aid of Al-Li alloy 1420 allograft and its dissimilar splicing with copper alloy H62and stainless steel 410, the preparation process of T-type joint is introduced in detail, and the static strength and energy absorption of the joint in the process of peeling are studied by tensile peeling test. In addition, a group of Al-Li alloy 1420 single lap joints were set up to carry out the relative comparative analysis. The fatigue tests of the above three groups of T-type self-impact riveting heads were carried out under pull-pull cyclic loading. The fatigue life curve of the three groups of joints was obtained and the fatigue strength of the three groups of joints was analyzed. The failure form and mechanism of the joints were also analyzed in detail through macroscopic and microscopic aspects. The analysis shows that as the load decreases, The fracture microanalysis results show that the crack initiation zone is a flat quasi-cleavage, and the crack transient fracture zone is a prominent intergranular or dimple feature. Material combination, material properties and internal stress. The mechanical properties of Al-Li alloy 8090 and its T-type self-impact riveting head combined with copper alloy H62and titanium alloy TA1 were studied. The energy absorption properties and related failure modes were analyzed. The T-shaped joints with the combination of 8090 Al-Li alloy and galvanized steel were made. In order to study the effect of different piercing directions of rivets on mechanical properties and failure modes of joints, the application of self-impact rivet-bonding composite connection technology in T-type structure was studied. In order to expand the material application field of T-type self-impact riveting riveting head, this paper also studies the joint forming quality, mechanical properties, adhesive agent, sheet combination and die of the self-impact rivet-bonding composite connection of 8090 Al-Li alloy, in order to expand the material application field of T-type self-impact riveting head. The T-type self-impact riveting head of titanium alloy TA1 is also studied in this paper.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG938

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