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Since Irwin's report, numerous researchers have studied fracture mechanics. Fracture mechanics has now matured into a key branch of stress analysis and structure design. In this paper, the development of the concept of fracture toughness is explained and fracture toughness is obtained for the specimen with artificial edge notch cut out to simulate the crack or flaw in the material. Stress concentration factor is used to calculate the maximum stress and modulus of elasticity is measured using extensormeter. By the present method, the resistence of sheet materials to unstable fracture originating from a very sharp stress concentration or crack is measured. The modulus of elasticity is measured for the material with various heat treatment. They reduced according to the order of full annealing, cold working oil quenching, water quenching while fracture toughness increased in order of afore mentioned treatments.
Recently, high-performance composite materials have been used for various industrial fields because of their superior high strength, high stiffness and lower weight. In this study, reinforced metal laminate materials are composed of two parts. One is hard-anodized Al5083 alloy as a face material and the other is high strength aramid fiber (Twaron CT709) and polyethylene fiber(Dyneema HB25) laminates as a back-up material. Resistance to penetration is determined by protection ballistic limit(V-50, a static velocity with 50% probability for complete penetration) test method. V-50 test with 0° obliquity at room temperature were conducted with 5.56㎜ ball projectiles that were able to achieve near or complete penetration during high velocity impact tests.
U-Band with is used to hang a transformer at concrete pole is made by SB 41steel and it was plated hot dipping galvanization at 465℃ to Prevent corrosion, but in spite of hot dipping galvanization, U-Band should be changed to new one every 10~15 years because of corrosion. In this study, 5 standard CCT specimens were prepared by hot dipping galvanization respectively. By using tension test and fatigue test, mechanical properties and fatigue crack propagation behavior has been examined In an SB 41steel plate, 440℃ hot dipping galvanized SB 41steel plate and 495℃ hut dipping galvanized SB 41 steel plate to compare 465℃ hot dipping galvanized SB 41steel plate being used. The effect of dipping temperature(440℃, 465℃ and 495℃) and heat treatment time(3hr and 9hr) in galvanization are reported.