Design of Composite Structures Using Advanced Numerical Tools

Kulhavý, Petr; Lepšík, Petr

doi:10.21062/ujep/116.2018/a/1213-2489/mt/18/3/424

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The mathematical algorithm applied for generating the individual design points could be done according to Price et al. [19] and about their possible application to the composite materials, which could be read in Kulhavy and Lepsik [20]. Mokhtar et al.…”

Section: Methodsmentioning

confidence: 99%

“…To verify this fact faster, it is possible by using optimization algorithms based on, for example genetic algorithms, which could find the fitness function value of such a trivial task in a very short time. The mathematical algorithm applied for generating the individual design points could be done according to Price et al [19] and about their possible application to the composite materials, which could be read in Kulhavy and Lepsik [20]. Mokhtar et al [21] also mentioned that for the AE45 angle the wound kenaf/epoxy tubes have the best compressive strength.…”

Section: Description Of the Materials Used For The Production Of Compomentioning

confidence: 99%

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Model verification of material properties of wound composite rods in tensile loading

Novotná

Kulhavý

2018

Journal of Industrial Textiles

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The aim of this work is to find a suitable reinforcement in terms of mutual compatibility, surface microstructure, and mechanical properties of the resulting carbon composite parts. Two types of samples in layout þ 45 / 0 / AE 45 / 0 / À45 and þ 45 / 0 / À45 with a total thickness of 1.8 mm, wound on a rounded polyurethane core from several carbon rovings, were experimentally tested in the area of low elastic deformation up to 1 mm. In order to obtain basic engineering constants the tensile tests of whole parts failure have been carried out. Subsequently, several material and numerical models were developed in order to describe the problem of composite tensile loading. The model was solved by two approaches, specifically a layered shell and a layered solid. Considerable differences have been found in the properties of the real (experimental) and theoretical model based on the declared properties of the individual components. Probably due to the manufacturing imperfections and the porosity in the resulting material, the values of the basic engineering constants of the laminate of the resulting laminate reach lower values. This had to be solved by adjusting the material model of the used dispersion and matrix. The real arising failures were described by using the failure criteria for several time steps of the model solution and compared to the real experiment with quite good agreement.

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Section: Methodsmentioning

confidence: 99%

Section: Description Of the Materials Used For The Production Of Compomentioning

confidence: 99%

Model verification of material properties of wound composite rods in tensile loading

Novotná

Kulhavý

2018

Journal of Industrial Textiles

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Application of composite materials in sports optics

Kupčák¹,

Zouhar²

2020

Manufacturing Technology

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CFRP (Carbon Fiber Reinforced Polymers) are often used when designing parts that need to be stiff, light and thermally stable. These benefits are a big motivation to use CFRP in many applications, one of them could be sports optics. However, optical devices require precise dimensions with tight tolerances for the optical assembly to work correctly. In order to determine if CFRP could be a suitable material of choice for sports optics a simplified body of binoculars was designed. The tubular body was manufactured by prepreg lay-up into a 3D printed mold, followed by curing in an autoclave. After the prototype was manufactured 3D measurements of the tube using 3D scanner GOM ATOS were made. As expected, shrinkage of the mold and the epoxy resin in the matrix of CFRP caused minor deformations. However, if the shape of the cured part remains unchanged during conditions similar to the general use of binoculars, then the initial deformations happening during manufacturing could be accounted for when designing the part.

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Experimental and Numerical Analysis of Dynamic Properties of Wound and Wrapped Carbon Composites

Kulhavý¹,

Fliegel²

2019

Manufacturing Technology

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In the presented work, static and dynamic properties of two, theoretically identical composite rods were studied. Those two kinds of rod were made of pre-impregnated fibers so called "prepregs". The first of them was made by means of wrapping technology, which is simply just helical layering of one wide tape around a rotating mandrel. The weakness of this method is possible using only for straight parts. That is why a simultaneous deposition of several thinner filaments in a form of tape called winding was used in order to optimize this technology also for curved parts with various cross-sections. The target of this work was to compile numerical model and experimentally compare flexural strength of the theoretically identical wrapped and wound rods in the static three point test.Further small samples cut and extracted from those rods were subjected to dynamic bending loading on Dynamic Mechanical Analyzer, with various loading speed, in order to obtain also the dynamic properties. The found results and conclusions of this article should provide a basic idea how significantly the manufacturing process could affects the microstructure and real mechanical properties of long fibers composite parts.

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Design of Composite Structures Using Advanced Numerical Tools

Cited by 3 publications

References 9 publications

Model verification of material properties of wound composite rods in tensile loading

Model verification of material properties of wound composite rods in tensile loading

Application of composite materials in sports optics

Experimental and Numerical Analysis of Dynamic Properties of Wound and Wrapped Carbon Composites

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