Nesrin Sahbaz Karaduman

• PhD
• Professor (Assistant) at Bozok University

Alkali pretreatment of fibers is an efficient technique to enhance fiber/matrix bonding in natural fiber composites. This study investigates if the addition of sodium dodecyl sulfate (SDS) surfactant increases the efficacy of alkali treatment of hemp fibers. SDS concentrations ranging between 2 and 10% wt/wt were used with a constant (10% wt/wt) Na...

Natural fiber reinforced polymer composites have attracted great attention in the past few decades due to increasing environmental awareness and various advantages of these materials in terms of mechanical properties, sustainability, renewability and biodegradability. In this study, hemp rovings with various amounts of twist were prepared using wat...

Hospital-acquired infections especially those occur in intensive care units are an important source of mortality, morbidity, and cost. Plant materials have been an important source for antimicrobial agents for ages. To date, the antimicrobial activity of plant materials were generally tested using their extracts. There are only a few studies that d...

Polymer composites reinforced with natural bast fibers have attracted great attention in the past few decades due to increasing environmental awareness and various advantages of these materials in terms of mechanical properties, sustainability, renewability, and biodegradability. In this study, non-interlaced multiaxial jute fabric/epoxy composites...

Natural fiber composites have a growing popularity as alternative materials to petroleum-based plastics and glass fiber reinforced composites due to various economic and environmental reasons. Textile preforms such as woven, knitted, braided, nonwoven, and multiaxial fabrics are commonly used in composite industry due to their high mechanical prope...

In-plane shear and mode‒II interlaminar fracture toughness properties of three-dimensional nanostitch para-aramid/phenolic composites were experimentally studied. Introducing the nanostitching yarn into nanocomposites slightly enhanced their shear strengths and the interlaminar fracture toughness (GIIC) due to the through-the-thickness reinforcemen...

Human comfort is defined as a neutral state, and being free from pain. Thermal comfort is an integral part of overall human comfort. It can be described as the optimum thermal state of the body created by the balance between the heat production and heat loss. Textiles play an important role for thermal comfort because they are the transfer route fo...

Textile materials are an integral part of protective equipment against the various environmental hazards we face every day during our routine or work activities. These include hazards from heat and cold, fire, chemicals, radiation, ultraviolet light, microorganisms and so on. Protection against heat and cold has been a primary task for textile mate...

Mechanical properties such as tensile, shear and interlaminar shear of multi-nanostitched three dimensional (3D) carbon/epoxy composites were studied. Introducing the polyacrylonitrile (PAN) nanostitched yarn into carbon preform composite marginally decreased the tensile properties, whereas it improved the shear and interlaminar shear properties. M...

Fiber-reinforced composite materials have many advantages in various engineering applications when compared to traditional materials such as glass, metals, ceramics and unreinforced plastics. Recently, textile-reinforced composites are increasingly used in various industries including aerospace, construction and automotive. This study aims to inves...

Fiber-reinforced composites have an increasing popularity in various industries including aerospace, automotive, recreation, and construction. Various composite fabrication methods are used to produce fiber composites. The type of matrix (i.e., thermosetting thermoplastic, or elastomeric) generally determines the fabrication method. Other factors a...

The effect of out-of-plane stitching and the addition of multiwalled carbon nanotubes on the short-beam shear properties of carbon/epoxy composites were investigated. Stitching influenced the short-beam strength of carbon satin and twill fabric composites, where the stitched satin carbon/epoxy composites showed improved short-beam properties compar...

The in-plane shear properties of nanostitched three-dimensional (3D) carbon/epoxy composites were investigated. Adding the stitching fiber or multiwalled carbon nanotubes or nanostitched fiber into carbon fabric preform slightly improved the shear strength and modulus of stitched and stitched nanocomposites. The in-plane shear fracture of the base...

Abstract: In this study, the flexural properties of nanostitched and nanoprepreg three dimensional (3D) para-aramid/phenolic composites were studied. For this reason, four types of composites were developed. They were called as stitched/nano, stitched, base/nano and base. Flexure strength and modulus of stitched/nano composites were slightly improv...

The tensile strength and failure of multilayered stitched carbon/epoxy multiwall carbon nanotube prepreg composites were investigated. Stitching, nano and, both stitching and nano slightly decreased the tensile strength and modulus of stitched and stitched/nano composites. The degradation of tensile properties in using para-aramid stitching yarn wa...

The tensile properties of nanostitched and nanoprepreg three dimensional para-aramid/phenolic composites were studied. The tensile responses of para-aramid/phenolic composites showed three regions as initial inter-fiber friction, crimp exchange and yarn extension regions. Their tensile moduli in each region were defined. It was obtained that stitch...

Abstract. The tensile properties of nanostitched and nanoprepreg three dimensional para-aramid/phenolic composites were studied. The tensile responses of para-aramid/phenolic composites showed three regions as initial inter-fiber friction, crimp exchange and yarn extension regions. Their tensile moduli in each region were defined. It was obtained t...

The effect of through-the-thickness stitching and incorporation of multiwalled carbon nanotubes (MWCNTs) on the flexural properties of three-dimensional (3D) carbon/epoxy composites was studied. The flexural strength of the carbon twill fabric composites was improved by stitching due largely to delamination suppression, whereas stitching negatively...

Natural fiber reinforced composites, also referred to as "biocomposites" or "green composites," are increasingly being used in structural and semistructural engi- neering applications due to their distinct advantages over traditional glass fiber reinforced composites. Biocomposites are sustainable, environmentally friendly, low cost, low density an...

Multiaxis 3D stitched para-aramide/phenolic and carbon/epoxy carbon nano tube composite structure and characterization of their mechanical and ballistic properties

It was concluded that the fiber content of weft knitted fabric composites can be increased by increasing Dy using the coarser yarns [36]. In general, the coarser yarns are difficult to knit and the coarsest yarn knittable is dependent on the yarn type and knitting needle size. In addition, the maximum Vf is limited by the knitting needles used in t...

Two dimensional (2D) and three dimensional (3D) fabric architectures, methods, processes and some of their properties have been reviewed in this chapter. 2D woven, braided, knitted and nonwoven fabrics are used for structural composites but they exhibit delamination between the layers. Triaxial fabrics, on the other hand, have an open structure and...

The aim of this study was to develop three-dimensional (3D) fully interlaced and semi-interlaced representative woven preform structures and to understand the effects of weave pattern and number of layers on 3D woven structures. Various 3D woven preforms were developed. Data generated from these structures included yarn angle, yarn-to-yarn space an...

The aim of this study was to develop three-dimensional (3D) fully interlaced representative circular woven preform structures and to understand the effects of weave pattern and number of layers on 3D circular woven structures. Various 3D circular woven preforms were developed. Data generated from these structures included yarn-to-yarn space, densit...

The aim of this study was to understand the effects of braid pattern and the number of layers on three-dimensional (3D) braided unit cell structures. Various unit cell-based representative 3D braided preforms were developed. Data generated from these structures included unit cell dimensions, yarn angle, and yarn length in the unit cell structures....

In this study, 3D fully and axial braided preforms were developed. They were investigated based on number of layers and number of steps which is processing parameter. It was understood that out of plane angle somehow influenced by the number of layers but, it was independent from the structure width. The structure density was not affected by the nu...