In this study, it was achieved failure analysis of wet-patch-repaired composite plates, experimentally. U notched composite plates were repaired with wet patch and then static tensile load was applied to composite plates. The patch thickness, single and double patch repair and fiber orientation angle of composite plates effect on the failure load were investigated. The composite plates having eight plies woven glass fiber and epoxy matrix resin, woven glass fiber and epoxy based adhesive were used as materials. The wet patches were obtained by epoxy adhesive impregnated to the woven glass fibers. As a result of experimental study, it was determined that the failure load was increased with increasing patch thickness. Also, it was seen that the double patch was more effective repair technique than single patch and the fiber orientation angle increasing was decreased the failure load of the composite plates.
This study investigates failure behaviors of woven glass fiber-reinforced epoxy resin composite plates with two parallel pins jointed and under the effect of seawater. The effects of joint geometry and immersion time in seawater were analyzed by experimental and numerical methods. In order to observe the effects of seawater, the samples were kept in seawater for periods of zero, three, and six months. For the observation of the joint geometry effect on the failure behaviour, the edge distance-to-upper hole diameter (E/D), the two hole-to-hole centre diameter (K/D), the distance from the upper or the lower edge of the specimen to the center of the hole-to-hole diameter (M/D), and the width of the specimen-to-hole diameter (W/D) ratios were selected as geometrical parameters. The numerical study where the progressive failure analysis was employed was carried out through a sub-program running in ANSYS 11.0 finite elements program. In order to predict the failure loads and failure types in the numerical analysis, the Tsai-Wu failure criterion was used along with material degradation rules. At the end of the study, it was determined that increase of the immersion time in seawater caused weaker mechanical properties and decrease in failure loads of samples. It was also found that the results of progressive failure analysis were consistent with the experimental results.
In this study; the effects of thermal aging on the mechanical properties of composite materials were investigated. In study, eight layered woven glass fiber reinforced epoxy composite plates were used. Thermal aging was performed in an electric furnace using time and temperature change parameters. The time changes were 1, 3 and 5 hours, and 50 0 C, 100 0 C, and 150 0 C were used for temperature changes. Thermally aged composite plates, at specified time and temperature values; modulus of elasticity, poisson ratio, tensile strength, compression strength, shear modulus and shear strength were determined in fiber reinforcement direction. The results obtained were compared with the results obtained from the specimens waited at room temperature. At the end of the study, it was determined that the mechanical properties of the composite plates changed when the thermal aging temperature and temperature increased.
Tek tesirli bağlantı, yapışma bağlantı, hidrotermal etki, hasar yükü, kompozit malzeme ÖZET Fiber takviyeli kompozitlerin birçok alanda kullanımları giderek artmaktadır. Bu alanlarda kullanımı etkileyen çevresel şartlar, kompozitlerin dayanımları ve bağlantı performansları üzerindeki etkilerinin anlaşılması açısından önemlidir. Ayrıca daha uygun tasarımların oluşmasında da etkin rol oynamaktadırlar. Bu çalışmada, farklı bindirme uzunlukları ve fiber takviye açılarına sahip, tek tesirli bindirme yapışma bağlantılı kompozitlerin hidrotermal ortamda davranışları incelenmiştir. Bu davranışları tahmin etmek için 40 o C, 60 o C ve 80 o C sabit bir su sıcaklığında ve değişken daldırma periyodlarında (15 gün, 30 gün ve 45 gün ) bir deneysel çalışma gerçekleştirilmiştir. Fiber takviye açıları [0 o ]8 ve [45 o /-45 o /0 o /90 o ]s olan cam epoksi kompozit levhalar kullanılmıştır. Bu iki levhadan bindirme uzunlukları 25 mm ve 35 mm olan numuneler hazırlanmıştır. Hidrotermal ortama yerleştirilen bu numunelerden, emilim oranları, hasar yükleri ve hasar tipleri elde edilmiştir. Bu sonuçlar kendi aralarında ve oda sıcaklığında bekletilen numuneler ile karşılaştırılmıştır. Bu çalışmada; [45 o /-45 o /0 o /90 o ]s fiber dizilimli numunelerden elde edilen hasar yük değerlerinin, [0 o ]8 fiber dizilimli numunelerden elde edilen değerlerden daha düşük olduğu tespit edilmiştir. En düşük hasar yük değerleri, 80 o C sıcaklığa maruz kalan numunelerden elde edilmiştir. Tüm numunelerin hidrotermal ortamda bekleme süresi ve ortamın sıcaklığı arttığı zaman hasar yüklerinin düştüğü ancak nem emilim oranlarının arttığı tespit edilmiştir. Buna bağlı olarak, genel olarak hasar tiplerinde, fiber hasarı ve yapıştırıcı hasarı beraber elde edilmiştir.
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