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Now showing items 1 - 5 of 5

  • Properties of a Metal-Nonmetal Hybrid Joint With an Improved Shape of the Metal Insert

    Miklavec, M.   Klemenc, J.   Kostanjevec, A.   Fajdiga, M.  

    A vehicle's brake pedal transfers the force from a human being to the braking mechanism, and as such is considered as a safety component in the vehicle. In the past, vehicle weight-reduction initiatives resulted in a highly optimised design of steel brake pedal with an increased strength-to-weight ratio. However, any further reduction in the weight of the brake pedal is only possible by using combined, that is hybrid, materials. Hybrid technologies enable the design of lighter and cheaper brake pedals within the strict limits of the safety and technical requirements. This article presents an example of an innovative mechanical joint with a metal insert moulded into a polymer base structure that could be applied for a brake-pedal design. The metal insert contributes the required strength, while the polymer part provides the final form. However, the design of the metal insert not only provides the strength of the component, but also ensures the proper bonding of the metal-to-polymer joint. This article presents a comparison of the strength for simple and optimised forms of the metal insert within the hybrid joint. The strength comparisons were performed using numerical simulations, which were also experimentally validated.
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  • Fatigue strength of a hybrid joint formed between a PA6-GF60 polymer matrix and a S420MC steel insert

    Miklavec, M.   Klemenc, J.   Kostanjevec, A.   Fajdiga, M.  

    A vehicle's brake pedal is considered to be one of its most important safety components. In the past, vehicle weight-reduction initiatives resulted in a highly optimized design of steel brake pedal with an increased strength-to-weight ratio. However, any further reduction in the weight of the brake pedal is only possible by using combined, i.e., hybrid, materials. In this case the joint between the two different materials in the hybrid arrangement must be as strong as possible. Many methods for improving the joint between two highly dissimilar materials are known from the literature, but conventional joining techniques lack either the fatigue resistance, because of a poor notch-effect design (shape-based joints), or are unsuitable for low-cost serial production (material-based joints). This article presents an innovative approach to joining the reinforcing insert with a glass-fiber-reinforced polyamide 6 (PA6-GF) base structure, where the reinforcing insert is molded into the PA6-GF. The improved shape of the reinforcing insert contributes the required strength, while the PA6-GF base structure provides the final form of the specimen/product. The innovative shape of the metal insert not only provides the strength of the component; it also ensures the proper joint between the two dissimilar materials. For different types of reinforcing inserts static durability tests as well as fatigue-life tests of the insert-PA6-GF-matrix joints were performed. Our experimental research shows that the most promising shape-based hybrid joints reported in the literature are not the best solution when the hybrid joint's fatigue life is the decisive criterion for a product's durability. [All rights reserved Elsevier].
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  • High count rate gamma-ray spectroscopy with LaBr3:Ce scintillation detectors

    Loeher, B.   Savran, D.   Fiori, E.   Miklavec, M.   Pietralla, N.   Vencelj, M.  

    The applicability of LaBr3:Ce detectors for high count rate gamma-ray spectroscopy is investigated. A 3 in. x 3 in. LaBr3:Ce detector is used in a test setup with radioactive sources to study the dependence of energy resolution and photo peak efficiency on the overall count rate in the detector. Digitized traces were recorded using a 500 MHz FADC and analysed with digital signal processing methods. Good performance is obtained using standard techniques up to about 500 kHz counting rate. A pile-up correction method is applied to the data in order to further improve the capabilities at even higher rates with a focus on recovering the losses in efficiency due to signal pile-up. It is shown that gamma-ray spectroscopy can be performed with only moderate lossen in efficiency and high resolution at count rates even above 1 MHz and that the performance can be enhanced in the region between 500 kHz and 10 MHz by using the applied pile-up correction techniques. (C) 2012 Elsevier B.V. All rights reserved.
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  • Properties of a Metal-Nonmetal Hybrid Joint With an Improved Shape of the Metal Insert

    Miklavec, M.   Klemenc, J.   Kostanjevec, A.   Fajdiga, M.  

    A vehicle's brake pedal transfers the force from a human being to the braking mechanism, and as such is considered as a safety component in the vehicle. In the past, vehicle weight-reduction initiatives resulted in a highly optimised design of steel brake pedal with an increased strength-to-weight ratio. However, any further reduction in the weight of the brake pedal is only possible by using combined, that is hybrid, materials. Hybrid technologies enable the design of lighter and cheaper brake pedals within the strict limits of the safety and technical requirements. This article presents an example of an innovative mechanical joint with a metal insert moulded into a polymer base structure that could be applied for a brake-pedal design. The metal insert contributes the required strength, while the polymer part provides the final form. However, the design of the metal insert not only provides the strength of the component, but also ensures the proper bonding of the metal-to-polymer joint. This article presents a comparison of the strength for simple and optimised forms of the metal insert within the hybrid joint. The strength comparisons were performed using numerical simulations, which were also experimentally validated.
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  • Pulse shape classification in liquid scintillators using the fuzzy c-means algorithm

    Savran, D.   Loher, B.   Miklavec, M.   Vencelj, M.  

    A new approach to pulse shape classification for neutron detectors of type BC501A has been investigated The method is based on the fuzzy c-means (FCM) algorithm which allows finding clusters of similar shapes in a set of digitized detector pulses The aim of the method is to provide principal pulse shapes which further can be used to apply a pulse shape based particle identification Since the method is not adapted to the case of liquid scintillator signals it is of general use and can also be applied to signals of other detector types A detailed study of the quality of the FCM method for the search of principal pulse shapes in BC501A liquid scintillators is presented using a 500 Msample/s 12 bit digitizer and a Cf-252 neutron source A comparison to principal pulse shapes extracted using time-of-flight information proves the applicability of the method Finally an example of a pulse shape discrimination method based on the extracted principal pulse shapes is presented and compared to the well-known integration method (C) 2010 Elsevier B V All rights reserved
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