冲击铆接过程的数值研究:初步结果

S. Krovvidi, M. Ramulu, P. Reinhall
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摘要

冲击铆接是一种可靠的装配方法,在航空航天工业中生产高质量的接头。它的成功应用源于它易于在装配车间环境中实现。铆钉在铆钉的柄端使用像扣件一样的成形工具形成,头部使用带有专用模头的气动枪进行约束和快速连续撞击。由于铆钉材料塑性流动在周向产生残余压应力,铆钉形成过盈配合接头。这些压应力被蒙皮和加劲体材料中的拉应力所平衡。纵向上的压应力有助于将表皮压在一起。专注于机器人自动化冲击铆接过程动力学建模的研究尚未提供对铆钉和铆钉孔附近应力场和应变场的时间演变的理解。这些研究的目的是生产相同强度的关节使用自动化装配过程与人工装配过程进行比较。到目前为止,还没有发表任何建模工作。这种理解对于产生可预测强度的关节是很重要的。本文将对一个未加劲的冲击铆接堆垛组件进行模拟,以研究扣压铆钉内有益的压残余应力和应变的趋势。我们的目标是最终估计出规定的接头装配参数集的接头强度。感兴趣的领域将被限制在几英寸从铆钉轴。
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Numerical Study of the Percussive Riveting Process: Initial Results
Percussive riveting is a dependable assembly method that produces high-quality joints in the aerospace industry. Its successful application is derived from its ease to implement in an assembly floor environment. The rivets are formed on the shank end of the rivet using a forming tool like a bucking bar and the head is constrained and impacted with a rapid succession of hits using a pneumatic gun with a special purpose die head. The rivet forms an interference fit joint because of the residual compressive stresses that are set up in the circumferential direction due to plastic flow of rivet material. These compressive stresses are balanced by tensile stresses in the skin and stiffener bulk material. Compressive stresses in the longitudinal direction help keep the skins pressed together. Research studies focused on the dynamics modeling of the percussive riveting process for robotic automation have not delivered an understanding of the temporal evolution of stress and strain fields in the vicinity of the rivet and the rivet hole. These studies aimed to produce joints of equal strength using automated assembly process compared with the manual assembly process. No modeling efforts have been published up to this point in time. This understanding is important in order to produce joints of predictable strength. A simulation effort for an unstiffened percussive riveting stackup assembly will be undertaken to study the trends of beneficial compressive residual stresses and strains within the bucked rivet. It is our goal to eventually estimate joint strength for prescribed sets of joint assembly parameters. The domain of interest will be restricted to few inches from the rivet axis.
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