激光强化诱导整体加筋板应力形成与位错演化：三点弯曲循环加载下疲劳裂纹扩展行为

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-07-18 DOI:10.1016/j.optlastec.2025.113584

Gaoqiang Jiang , Li Li , Ying Chen , Lei Huang , Xiankai Meng , Shu Huang , Jianzhong Zhou

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引用次数: 0

摘要

针对整体蒙皮结构，提出了一种激光强化成形制造及疲劳性能增强的综合工艺。探讨了整体加筋板的成形规律，并对典型位置的位错特征进行了表征。分析了裂纹细化、位错演化和压残应力（CRS）注入对裂纹扩展的抑制机制。揭示了三点弯曲循环加载模式下的疲劳裂纹扩展行为和疲劳寿命延长机理。结果表明，加筋后弯曲曲率减小17.3倍。LP导致含有高密度位错的细晶层，伴随着第二相的增加和粗化。压缩区只受CRS的影响，位错密度和第二相析出减小，出现了许多亚晶。在三点弯曲循环加载模式下，LPFed试样的疲劳寿命分别提高了8.6倍、10.6倍和11.3倍。垂直于裂纹的压缩加劲筋增加了裂纹扩展的距离和面积，粗糙表面的重叠斑点“引导”了偏离的裂纹返回。LP和变形注入的高密度位错和压缩细晶粒层具有位错强化、细晶粒强化和压缩增韧作用。

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Laser peening induced stress forming and dislocation evolution of the integral stiffened plate: fatigue crack growth behavior under three-point bending cyclic loading

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Laser peening induced stress forming and dislocation evolution of the integral stiffened plate: fatigue crack growth behavior under three-point bending cyclic loading

A comprehensive process of forming manufacturing and fatigue performance enhancement by laser peening (LP/LPF) was proposed for integral skin structure. The forming law for integral stiffened plate was explored, and the dislocation features of typical positions after LPF was characterized. The inhibition mechanism of crack propagation by grain refinement, dislocation evolution, and compressive residual stress (CRS) implantation in typical positions induced by LP and deformation was analyzed. The fatigue crack growth behavior and fatigue life extension mechanism under three-point bending cyclic loading mode were revealed. Results revealed that the stiffener decrease the bending curvature by 17.3 times. LP causes a fine-grained layer containing high-density dislocations, accompanied by increased and coarsened second phase. The dislocation density and second phase precipitation in the compressed region only affected by CRS decrease, and many subgrains appear. Under three-point bending cyclic loading mode, the fatigue life of LPFed samples increase by 8.6, 10.6, and 11.3 times. The compressed stiffener perpendicular to crack increase the distance and area to inhibit propagation, and overlapping spots induced rough surface “guides” the deviated crack return. High-density dislocations and compressed fine grain layers implanted by LP and deformation have dislocation strengthening, fine grain strengthening, and compression toughening effects.

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来源期刊

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems