The development of additive manufacturing techniques for composite structures brought the emergence of a new class of composite materials: the variable angle-tow composites. Additive manufacturing of reinforced polymers allows the tow to be placed along a curvilinear path in each lamina. Accordingly, optimised solutions with enhanced properties can be manufactured. In this work, the multi-scale two-level optimisation strategy for composites is exploited to optimise the strength of variable angle-tow composites subject to mechanical and manufacturing constraints. At the first step of the strategy, the laminate strength is described through a laminate-level failure criterion based on tensor invariants and on the first-order shear deformation theory. The lay-up design phase makes use of quasi-trivial solutions and integrates a check on the first-ply failure in order to ensure the integrity of the whole laminate. The effectiveness of the strategy as well as of the proposed failure criterion is proven on some meaningful test cases.

中文翻译：

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通过层压板级失效准则优化可变角度丝束复合材料的强度

复合结构增材制造技术的发展带来了一类新型复合材料的出现：可变角度牵引复合材料。增强聚合物的增材制造允许将丝束沿每个层中的曲线路径放置。因此，可以制造具有增强特性的优化解决方案。在这项工作中，利用复合材料的多尺度两级优化策略来优化受机械和制造约束的可变角度牵引复合材料的强度。在该策略的第一步，层压板强度通过基于张量不变量和一阶剪切变形理论的层压板级失效准则来描述。叠层设计阶段使用准简单的解决方案，并集成了对第一层故障的检查，以确保整个层压板的完整性。在一些有意义的测试案例中证明了该策略以及所提出的故障标准的有效性。