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Fabrication, characterisation and modelling of corrugated wire mesh laminates

机译:波纹金属丝网层压板的制造,表征和建模

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摘要

Corrugated Wire Mesh Laminates (CWML) are open cell type cellular structures manufactured by bonding several layers of metallic corrugated wire meshes on top of each other. Due to their open cell structure and the mechanical properties of the parent material, CWML can offer high stiffness and strength per unit weight. Therefore, they have many potential applications where lightweight and high rigidity and strength are required, such as in sandwich constructions in mechanical and aerospace engineering, and orthopaedic implants in biomedical engineering. The main loading in such applications is transverse compression, occasionally accompanied by in-plane shear. This thesis presents an attempt to understand and characterise the behaviour of corrugated wire mesh laminates under transverse compression loading. First, a theoretical model is developed for the CWML using a truss structure to approximate the corrugated wire. Although simplistic, this model is useful in establishing expressions for the relative density, effective transverse stiffness and transverse compressive strength of the CWML. The influences of wire diameter, opening width, and the corrugation angle on these parameters are established. A new method is developed for the fabrication of CWML at a relatively low temperature of 225 degrees Celsius making it significantly simpler and cost effective compared to existing methods. For the first time, a finite element model is developed to numerically simulate the deformation behaviour of CWML under transverse compression and shear loading. The numerical model investigates the effects of nonlinearities such as material nonlinearity, large deformation behaviour, curvature at the tip of the corrugations and friction. Experimental testing is conducted on several samples of single layer, two layer, and four layer wire mesh laminates under transverse compression and separately under shear loading. The test results show considerable scatter probably due to variations in the quality of the bonding in the manufacturing process. The load deflection behaviours of the single and multi layer laminates observed in the tests are compared to those analytically determined by the numerical simulations. Unfortunately, the agreement between the numerical analysis and the experimental results is rather poor; this is attributed to the bends in the wires as they cross over each other in the mesh, which were not modelled in the simulation. The finite element (FE) model, therefore, requires further improvement; nevertheless, it does provide significant insight into aspects that influence the deformation behaviour of CWML.
机译:波纹丝网层压板(CWML)是通过将多层金属波纹丝网彼此叠合而制成的开孔型蜂窝结构。由于其开孔结构和母体材料的机械性能,CWML可以提供较高的刚度和单位重量强度。因此,它们具有许多潜在的需要轻质,高刚度和强度的潜在应用,例如在机械和航空航天工程中的三明治结构中以及在生物医学工程中的骨科植入物。在这种应用中的主要载荷是横向压缩,偶尔伴随着平面内剪切。本文提出了一种尝试,以了解和表征波纹金属丝网层压板在横向压缩载荷下的行为。首先,使用桁架结构为CWML建立理论模型,以近似波纹线。尽管简单,但是该模型可用于建立CWML的相对密度,有效横向刚度和横向抗压强度的表达式。建立了线径,开口宽度和波纹角对这些参数的影响。开发了一种用于在225摄氏度的相对较低的温度下制造CWML的新方法,与现有方法相比,该方法明显更简单且更具成本效益。首次建立了有限元模型,以数值模拟CWML在横向压缩和剪切载荷作用下的变形行为。该数值模型研究了非线性的影响,例如材料的非线性,大变形行为,波纹尖端的曲率和摩擦。在横向压缩下并在剪切载荷下分别对单层,两层和四层金属丝网层压板的几个样品进行实验测试。测试结果显示出很大的分散性,可能是由于制造过程中键合质量的变化所致。将在测试中观察到的单层和多层层压板的载荷挠度行为与通过数值模拟分析确定的载荷挠度行为进行比较。不幸的是,数值分析和实验结果之间的一致性很差。这归因于导线在网格中彼此交叉时发生的弯曲,这在模拟中并未建模。因此,有限元(FE)模型需要进一步改进。但是,它的确为影响CWML变形行为的各个方面提供了重要的见识。

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