基本信息
项目批准号：51805375
申请代码：E0508
项目名称：铝合金热辅助搅拌摩擦单面铆接过程的演化机理(lǐ)
项目负责人：闵峻英
依托单位：同济大學(xué)
研究期限：2019-01-01 至 2021-12-31
资助经费：28.0（万元）
项目摘要
中文(wén)摘要：
高强度铝合金板以及挤压铝合金型材的运用(yòng)对航空航天、汽車(chē)等轻量化的实施具有(yǒu)重要意义。感应热辅助搅拌摩擦单面铆接是解决高强度铝合金连接以及复杂结构连接等问题的有(yǒu)效措施。本项目通过研究7xxx系高强度铝合金板和6xxx系挤压铝合金的动态热变形行為(wèi)并建立相应的断裂准则，对感应热辅助搅拌摩擦单面铆接进行仿真建模及实验验证，研究两种铝合金在被铆钉搅拌摩擦挤压的穿透过程中温度场演化；结合铆接过程中两种铝合金微观组织演化的实验研究以及铆钉穿透动力學(xué)分(fēn)析，来揭示感应热辅助搅拌摩擦单面铆接工艺中铆钉的穿透机理(lǐ)。通过感应热辅助搅拌摩擦单面铆接工艺参数、铝合金工件孔壁材料硬度分(fēn)布等机械性能(néng)与接头力學(xué)性能(néng)（拉伸强度、失效模式等）之间的关系研究，探索感应热辅助搅拌摩擦单面铆接工艺参数对接头力學(xué)性能(néng)的影响机理(lǐ)，為(wèi)两种铝合金的同材及异材感应热辅助搅拌摩擦单面铆接接头的力學(xué)性能(néng)调控提供理(lǐ)论基础。
英文(wén)摘要：
Applications of high strength Al alloy sheets and Al alloy extrusions are of significance to the implementation of lightweighting in aerospace and automotive industries. Combining induction heating and friction stir blind riveting is an effective approach to joining of not only high strength Al alloys but also complex structures. In this proposed project, the dynamic hot deformation behavior of a high strength 7xxx Al alloy sheet (7xxx-S) and an extruded 6xxx Al alloy (6xxx-E) will be studied and their fracture criteria will be built, which provide basis to the finite element modeling of the induction-heating-assisted friction stir blind riveting (I-FSBR). The evolutions of temperature fields in the 7xxx-S and 6xxx-E workpieces will be simulated by using finite element method and validated with experimental measurements. Then the penetration mechanism of the blind rivet in I-FSBR will be revealed with the aids of experimental observations of the microstructural evolutions in the 7xxx-S and 6xxx-E workpieces and the kinematics analysis of rivet penetration. Through the investigation on the relationships among the I-FSBR processing parameters, mechanical properties (e.g. microhardness distribution) of the wall holes on the 7xxx-S and 6xxx-E workpieces, and mechanical performance of the I-FSBR joints, the effect of I-FSBR processing parameters on the mechanical performance of the I-FSBR joints will be explored. This provides theoretical basis for the property control of similar and dissimilar material joints fabricated from 7xxx-S and 6xxx-E Al alloys.
                                                                                                                                                                                                       ——来自https://kd.nsfc.gov.cn/