Improving the formability of sandwich sheets by the hydrostatic effect of encapsulated media

IF 2.6 3区 材料科学 Q2 ENGINEERING, MANUFACTURING International Journal of Material Forming Pub Date : 2023-07-03 DOI:10.1007/s12289-023-01768-x
Yuki Shibuya, Jun Yanagimoto
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Abstract

Various sandwich structures have been developed as lightweight structures. They have excellent specific stiffness owing to their low density. However, owing to the existence of various failure modes, which are classified into core shear failure, tensile fracture of the face sheet, buckling of the face sheet, and delamination, it is difficult to deform sandwich sheets without any failure. A new forming strategy was proposed in this study. Buckling of the face sheet during drawing was suppressed by filling the encapsulated media in a 3D core between the face sheets to exploit its hydrostatic effect. This process is similar to the freeze-bend method, in which the pipe is filled with ice during bending to suppress wrinkles and flattening. Ice, wax, and low-melting alloys were used as the encapsulated media, and their formability and ease of removal were investigated. Further, a shear strength test was performed on the specimens that were cut out from the drawn products to evaluate failure during forming. Based on these experimental results, the characteristics required for the encapsulated media were summarized.

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利用封装介质的流体静力效应提高夹芯板的成形性
各种夹层结构作为轻量化结构得到了发展。由于密度低,具有优良的比刚度。然而,由于夹层板存在多种破坏模式,主要分为芯层剪切破坏、面板拉伸断裂、面板屈曲破坏和分层破坏,因此夹层板变形而不破坏是很困难的。本研究提出了一种新的成形策略。通过在工作面之间的三维芯内填充封装介质来抑制工作面拉伸过程中的屈曲,充分利用其流体静力效应。这一过程与冷冻弯曲方法类似,在冷冻弯曲过程中,管道内充满冰,以抑制褶皱和变平。采用冰、蜡和低熔点合金作为包覆介质,研究了它们的成形性和去除性。此外,对从拉伸产品中切割出来的试样进行剪切强度测试,以评估成形过程中的破坏情况。根据这些实验结果,总结了封装介质所需的特性。
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来源期刊
International Journal of Material Forming
International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
5.10
自引率
4.20%
发文量
76
审稿时长
>12 weeks
期刊介绍: The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.
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