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|Title:||Effect of laser shock processing on fatigue crack growth of duplex stainless steel|
|Abstract:||We evaluated the effects of Ginkgo biloba extract (EGb 761) on the cellular immune response of rats with immunosuppression induced by activation of the hypothalamic-pituitary-adrenal (HPA) axis. Groups of five rats were subjected to chronic stress by the application of daily electric shocks (ES) over 7 days. This stress produced a significant decrement in the delayed-type hypersensitivity response (DTH) to dinitrofluorobenzene (DNFB), and a decrease in the proliferation index of splenocytes. Treatment with oral doses of the phytopharmaceutical EGb 761 (100 mg/kg per day over 7 days) restored both the DTH response to DNFB and the proliferation index. EGb 761 has stress-alleviating properties through its moderation of corticosterone levels. It also possesses antioxidant activity that may contribute to its effects on the immune response. Our observations indicate that the phytopharmaceutical EGb 761 possesses immunostimulatory properties. " 2002 Elsevier Science B.V. All rights reserved.",,,,,,"10.1016/S1567-5769(02)00215-1",,,"http://hdl.handle.net/20.500.12104/40944","http://www.scopus.com/inward/record.url?eid=2-s2.0-0037238528&partnerID=40&md5=1177700b6177af9a482f2d224e592423",,,,,,"1",,"International Immunopharmacology",,"75|
WOS",,,,,,"Cellular immune response; DTH response; EGb 761; HPA axis activation",,,,,,"Effect of Ginkgo biloba extract, EGb 761, on the cellular immune response in a hypothalamic-pituitary-adrenal axis activation model in the rat",,"Article" "42731","123456789/35008",,"Rubio-González, C., Centro de Ingeniería y Desarrollo Industrial, Pie de la Cuesta, 702, Desarrollo San Pablo, Querétaro, Qro., 76130, Mexico; Felix-Martinez, C., Centro de Ingeniería y Desarrollo Industrial, Pie de la Cuesta, 702, Desarrollo San Pablo, Querétaro, Qro., 76130, Mexico; Gomez-Rosas, G., Universidad de Guadalajara, Guadalajara, Jal, Mexico; Ocaña, J.L., Departamento de Física Aplicada a la Ingeniería Industrial, E.T.S.I.I., Universidad Politécnica de Madrid, Spain; Morales, M., Departamento de Física Aplicada a la Ingeniería Industrial, E.T.S.I.I., Universidad Politécnica de Madrid, Spain; Porro, J.A., Departamento de Física Aplicada a la Ingeniería Industrial, E.T.S.I.I., Universidad Politécnica de Madrid, Spain",,"Rubio-Gonzalez, C.
Porro, J.A.",,"2011",,"Duplex stainless steels have wide application in different fields like the ship, petrochemical and chemical industries that is due to their high strength and excellent toughness properties as well as their high corrosion resistance. In this work an investigation is performed to evaluate the effect of laser shock processing on some mechanical properties of 2205 duplex stainless steel. Laser shock processing (LSP) or laser shock peening is a new technique for strengthening metals. This process induces a compressive residual stress field which increases fatigue crack initiation life and reduces fatigue crack growth rate. A convergent lens is used to deliver 2.5J, 8ns laser pulses by a Q-switched Nd:YAG laser, operating at 10Hz with infrared (1064nm) radiation. The pulses are focused to a diameter of 1.5mm. Effect of pulse density in the residual stress field is evaluated. Residual stress distribution as a function of depth is determined by the contour method. It is observed that the higher the pulse density the greater the compressive residual stress. Pulse densities of 900, 1600 and 2500pul/cm2 are used. Pre-cracked compact tension specimens were subjected to LSP process and then tested under cyclic loading with R=0.1. Fatigue crack growth rate is determined and the effect of LSP process parameters is evaluated. In addition fracture toughness is determined in specimens with and without LSP treatment. It is observed that LSP reduces fatigue crack growth and increases fracture toughness if this steel. " 2010 Elsevier B.V.
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