Experimental Study on Static and Dynamic Fracture Toughness of Cured Epoxy Resins

Skoczylas, Jakub; Samborski, Sylwester; Kłonica, Mariusz

doi:10.12913/22998624/104702

Cited by 6 publications

(4 citation statements)

References 14 publications

(15 reference statements)

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“…This could be also helpful for selection of proper tools and technological parameters of machining. Experimental methods and equipment used in the paper to determine fracture toughness values have been already successfully applied in the case of other materials [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

et al. 2021

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Tungsten carbide (WC) is well known as one of the hardest materials widely used in machining, cutting and drilling, especially for cutting tools production. Knowing fracture toughness grants the opportunity to prevent catastrophic wear of a tool. Moreover, fracture toughness of WC-based materials may vary because of different material compositions, as well as a different way of production. Hence, each material should be treated individually. In this paper, SM25T (HW) tungsten carbide (HW—uncoated grade, TNMR 401060 SM25T, manufactured by Baildonit company, Katowice, Poland) was taken into consideration. Sintered carbides—designated as S—are designed to be applied for machining steel, cast steel and malleable cast iron. Fracture mechanics methods were adapted to make a quality assessment of WC cutting inserts. Both quasi-statical three-point bending tests, as well as Charpy dynamic impact tests, were performed to calculate static and dynamic fracture toughness (KIC and KID, respectively). In addition, a special emphasis was placed on the microscopic analysis of fracture surfaces after impact tests to discuss material irregularities, such as porosity, cracks and so-called “river patterns”. There is a lack of scientific works in this field of study. However, cutting engineers are interested in obtaining the experimental results of that kind. Although there are a few standardized methods that may be used to determine fracture toughness of hard metals, none of them is expected to be the most reliable. Moreover, there is a lack of scientific works in the field of determining static and dynamic fracture toughness of WC by the presented method. The proposed examination solution can be then successfully used to calculate toughness properties of WC-based materials, as the results obtained seem to be with a good agreement with other works.

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Section: Introductionmentioning

confidence: 99%

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

et al. 2021

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“…This speed corresponds to a force increase of 10 kN per second, which should be similar to the rate of force increase in wishbones during vehicle operation. Obviously, there can be a difference between static and dynamic toughness as seen in [ 32 ], yet for the final project it is more important to be physically accurate with the testing method rather than obtain possibly higher results. The testing setup can be seen in Figure 3 .…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Bonding Gap Control Methods for an Epoxy Adhesive Joint of Carbon Fiber Tubes and Aluminum Alloy Inserts

et al. 2021

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The aim of this paper is to compare two methods of epoxy adhesive bond gap control: one with a geometrical (mechanical) solution and the other with glass beads, which have the diameter of the desired bond gap and are mixed with an epoxy adhesive. The adhered materials were carbon fiber composite tubes and aluminum alloy inserts, which were used as wishbones in a suspension system of a motorsport vehicle. It was assumed that the gap thickness would be equal to 0.2 mm and the length of a bond would be 30 mm. The internal diameter of the tubes was 14 mm and 18 mm, whereas the inserts’ external diameter was 13.6 mm and 17.6 mm. Their surface has been subjected to mechanical treatment with sand paper starting from 240 grit up to 400. The adhesives used were EA 3425 and EA 9466 cured at 80 °C for 2 h. The results showed that the glass beads method provides more consistent and better results as compared to the geometrical (mechanical) method. Further study in the area of fatigue and interfacial failure modes could be useful.

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“…The examination of fracture under dynamic loading was analyzed in the case of engineering materials, like epoxy resins, polyurethane foam materials aluminum alloy, etc. [11][12][13]. In the literature describing the mechanical properties of bones, there are few reports characterizing the behavior of bones under impact loading.…”

Section: Introductionmentioning

confidence: 99%

Methodological Aspects of Rat Bone Mechanical Impact

Skic¹,

Kołodziej²,

Puzio³

et al. 2022

Adv. Sci. Technol. Res. J.

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A three-point bending test under quasi-static load conditions is usually used in studies on the bones' mechanical properties. On its basis, the bone strength is determined, corresponding to the maximum force required for the fracture. In natural conditions, bone fractures most often occur as a result of an impact or fall, i.e. under dynamic loads, when a large force acts on the bone in a concise time. This work presents the results of a dynamic two-point bending test of rat bones. Two groups of the humerus were analyzed: healthy (as a control) and ovariectomized rats (as an osteoporosis model). During the bending test in the analyzed bone cross-section, a complex state of the surface density of internal forces will appear, characterized by the simultaneous occurrence of normal and tangential stresses. The obtained results determined the influence of osteoporotic changes on the transmitted dynamic forces values. The values of tensile and compressive stresses occurring at bone fracture were dependent rather on the bone asymmetry, the moment of inertia of its cross-section, and material properties than the loading force.

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Experimental Study on Static and Dynamic Fracture Toughness of Cured Epoxy Resins

Cited by 6 publications

References 14 publications

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

Adaptation of Fracture Mechanics Methods for Quality Assessment of Tungsten Carbide Cutting Inserts

Evaluation of Bonding Gap Control Methods for an Epoxy Adhesive Joint of Carbon Fiber Tubes and Aluminum Alloy Inserts

Methodological Aspects of Rat Bone Mechanical Impact

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