Simulation of the forming process for curved composite sandwich panels
Simulation of the forming process for curved composite sandwich panels
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DOI：
10.1007/s12289-019-01520-4
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发表时间：
2019-12
影响因子：
2.4
通讯作者：
S. Chen;O. McGregor;A. Endruweit;L. Harper;N. Warrior
中科院分区：
文献类型：
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作者：
S. Chen;O. McGregor;A. Endruweit;L. Harper;N. Warrior
对于具有复杂曲率和不同厚度的夹层板的可负担的大批量制造，织物蒙皮和芯结构使用一组匹配的工具同时压制成型。开发了一种基于有限元的过程模拟，该模拟考虑了钢筋蒙皮的剪切、核心结构的多轴变形以及界面处的摩擦。中尺度夹层模型，蜂窝细胞壁的测量性能的基础上，表明面板变形主要是在弯曲，如果出平面的运动的核心是不受约束的，而本地通过厚度的核心破碎是更重要的存在下，更强的约束。由于中尺度模型的计算成本很高，因此开发了一个补充性的宏观模型来模拟较大的组件。这是基于实验确定的蜂窝芯的均匀化特性。宏观尺度模型被用来分析一个通用部件的形成。模拟预测的三明治的工具，观察到的物理组件的局部一致性差。它也被准确地预测，在皮肤中的纤维剪切角低于临界角的织物起皱开始。
For affordable high-volume manufacture of sandwich panels with complex curvature and varying thickness, fabric skins and a core structure are simultaneously press-formed using a set of matched tools. A finite-element-based process simulation was developed, which takes into account shearing of the reinforcement skins, multi-axial deformation of the core structure, and friction at the interfaces. Meso-scale sandwich models, based on measured properties of the honeycomb cell walls, indicate that panels deform primarily in bending if out-of-plane movement of the core is unconstrained, while local through-thickness crushing of the core is more important in the presence of stronger constraints. As computational costs for meso-scale models are high, a complementary macro-scale model was developed for simulation of larger components. This is based on experimentally determined homogenised properties of the honeycomb core. The macro-scale model was employed to analyse forming of a generic component. Simulations predicted the poor localised conformity of the sandwich to the tool, as observed on a physical component. It was also predicted accurately that fibre shear angles in the skins are below the critical angle for onset of fabric wrinkling.