Yarn-Level Modelling of Woven and Unidirectional Thermoplastic Composite Materials Under Ballistic Impact

Ignatova

2022

DDF

Deformation and fracture analysis of the composite elements and structures under high-velocity impact is still associated with many problems. These problems are related not only to the complexity of taking into account the composite layered orthotropic structure and various failure scenarios but also to the problems of instrumented high-velocity impact tests to verify the calculation results. Different requirements for accuracy and numerical efficiency are imposed on the models and their predictive ability depending on the design stage. At the initial design stages, the model should allow one to estimate the energy absorption of the composite structure adequately. At later stages, the size of the damaged area and the fracture pattern also should be predicted with high accuracy. This article describes a simplified approach to the verification of deformation and fracture models of structural composites under high-velocity impact based on low-velocity impact test data. The model with the found parameters makes it possible to predict with satisfactory accuracy the energy absorption of the composite material.

Section: Methodsmentioning

confidence: 99%

Simplified Approach to Verification of Numerical Models for Deformation and Fracture Analysis of Structural Composite Subjected to High-Velocity Impact

Olivenko

Ignatova

2022

DDF

“…In previous studies, yarn-level modelling was used to calculate the mechanical behaviour of composites upon impact. [18][19][20][21]. However, its significant disadvantage is the large dimension of the problem, which does not allow optimisation of the structure design in a reasonable time.…”

Section: Modelling Of Homogeneous Compositesmentioning

confidence: 99%

Experimental and Numerical Study of the Hybridisation Effect on the High-Velocity Impact Resistance of Thermoplastic Composites Based on Aramid Fabrics

Zhikharev

Ignatova

2021

SSP

One of the urgent tasks of the development of new protective structures is to improve the ballistic performance of thermoplastic composites reinforced with synthetic high-strength fibres. Hybrid composites based on various types of fibres or fabrics with different weaving could be a possible solution to this problem. This paper presents the results of computational and experimental studies of hybrid composites based on aramid fabrics with satin and plain weave structures. Numerical modelling based on the reduced ply-level approach was used for the design of hybrid composites. The results obtained during calculations were in good agreement with validation experiments.

“…The third option is based on the using of standard threedimensional elements that are used to simulate interface layers. Often this approach is used along with yarn-level models [33][34][35], but other options are possible [34]. The explicit matrix consideration in the simulation allows reducing the number of parameters in the model that require identification since it is possible to use simple material deformation models (linear elastic or elastic-plastic).…”

Section: Meso-scale (Ply/yarn Level)mentioning

confidence: 99%

Creation and verification of computational models for analysis of the mechanical behaviour of jet engines composite components under high-velocity impact: main problems and basic recommendations

PNRPU Mechanics Bulletin

Zhikharev

Olivenko

2019

Currently, modern CAE programs like ANSYS, LS-DYNA, ABAQUS, Simcenter 3D etc. are widely used to develop each engineering product. CAE reduces development costs and speeds up product launches. Computer modelling allows eliminating unsuccessful design options at early design stages and minimising or eliminating critical design changes at the prototype testing stage. Computer simulations are especially needed for the development of high-performance perfection designs like jet engines. The use of composites in the engines requires the availability of appropriate design tools to assess the mechanical behaviour of structural elements made of such materials under operational loads and in an emergency. Predictive modelling of the deformation and fracture of the composite fan blades and fan case subjected to dynamic loading cause considerable interest of engineers. As in the case of simulation of shock loading of metals, a model of a composite material must be verified. However, the problem is that the fibrous composite material itself is already a structure and can be modelled in various ways: without considering the layered structure (homogeneous approach) taking the mesostructure into account (at the ply-level or at the yarn-level) taking the microstructure into account (at the filament level). The requirements for the initial data, the number of parameters determined during the verification process, the complexity of creating geometric models will differ in each case. This paper briefly describes the main approaches to the numerical simulation of composite elements under highvelocity impact loading. The main advantages and disadvantages of these approaches are also considered. On the example of the meso-scale approach, the main parameters of the computational models that affect the results of calculations are shown. Based on the obtained data, the main recommendations were formulated on the validation of meso-scale models of composites.