Damage Development in a Cellular Axisymmetric Tank Additive-Manufactured from Plastic Filament. Part 1. Damage Development in Cellular Axisymmetric Multilayer Shells Under Critical Mechanical Loads and Quivalent Properties of Model Layers for Stress-Strain State Estimation

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
M. I. Bobyr, M. G. Kryshchuk, O. F. Salenko, E. E. Onyshchenko, D. O. Tsurkan, A. O. Kostenko, M. V. Biletskyi, V. M. Orel, L. A. Lopata
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Abstract

The paper analyzes the peculiarities of forming honeycomb structures by additive methods (in particular, from plastic filament (Fused Deposition Method, FDM) and shows that the engineering application of products with honeycomb structures should take into account the peculiarities of structural damage development under the influence of working loads. For typified products in the form of closed multilayer shells (tanks for various technological purposes), these are thermobaric effects that lead to a loss of the long-term strength of the product and to the development of damages on the initial defects. It is proposed to divide the latter into three groups: defects in the form of cavities of various volumes and shapes, as well as contact patch defects at the adhesion boundary of the laid-down layers under the conditions of stable technological process; defects formed by random factors of a technological nature; defects arising from heterogeneities and initial differences in the material used (plastic filament). It is concluded that the loss of the bearing capacity of shells made of structural plastics (except for highly elastic ones) can be described by the development of cracks in the interlayer areas of the product in accordance with Griffiths’ theory. It is in these areas that the presence of defects is greatest. Since there is a significant difference between the mechanical properties of plastic filament and the product made by extrusion, it is proposed to use the equivalent properties of the components of a cellular system in the form of a three-layer connected shell in analyzing the stress-strain state of the product model.

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用塑料长丝制造的蜂窝状轴对称罐添加剂中的损伤发展。第 1 部分。临界机械载荷下蜂窝轴对称多层壳体的损伤发展以及用于应力-应变状态估计的模型层的等效特性
本文分析了通过添加法(特别是塑料丝(熔融沉积法,FDM))形成蜂窝结构的特殊性,并指出在工程应用蜂窝结构产品时应考虑到工作载荷影响下结构损伤发展的特殊性。对于封闭多层壳体形式的典型产品(用于各种技术目的的储罐),这些热压效应会导致产品长期强度下降,并在初始缺陷上产生损伤。建议将后者分为三类:不同体积和形状的空腔形式的缺陷,以及在稳定的技术工艺条件下铺设层粘合边界的接触片缺陷;由技术性质的随机因素形成的缺陷;由所用材料(塑料丝)的异质性和初始差异引起的缺陷。结论是,根据格里菲斯理论,结构塑料外壳(高弹性外壳除外)承载能力的损失可以用产品层间区域裂纹的发展来描述。正是在这些区域,缺陷的存在最为严重。由于塑料长丝的机械性能与挤压产品的机械性能之间存在显著差异,因此建议在分析产品模型的应力应变状态时,使用三层连接外壳形式的蜂窝系统组件的等效性能。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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