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عنوان فارسی مقاله:
مطالعه مقایسه ای خواص مکانیکی و رفتار شکست فیبر کربن / اپوکسی و الیاف کربن / مواد مرکب یک سویه پلی آمید 6
عنوان انگلیسی مقاله:
A comparative study of the mechanical properties and failure behavior of carbon fiber/epoxy and carbon fiber/polyamide 6 unidirectional composites
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Carbon fiber reinforced plastics (CFRPs) have been used in an extensive range of engineering applications because of their outstanding mechanical properties, which enable lightweight and extended service-life structures [1–5]. Metallic materials have gradually been replaced by CFRP [6–9]. It is well known that the mechanical properties of a CFRP are affected by various factors such as the properties of the fiber and matrix, the fiber volume fraction, fiber distribution, impregnation of the matrix, and compatibility between the fiber and the resin (interface and interphase). Manufacturing processes such as temperature, pressure, and process time also affect the mechanical properties. Therefore, many methods to improve the mechanical properties of CFRPs such as fiber treatment [10–12], post-treatment [7,9], structure optimization [7,9,13–15], and micro- or nano-scale filler doping [16– 21] have been investigated. One of the most efficient ways to ameliorate the capability of CFRPs is to choose an appropriate surface treatment to improve interfacial strength between the fibers and the matrix. During loading of a unidirectional (UD) CFRP, mesoscopic events, such as matrix cracking and fiber breakage, initiate and propagate progressively. Such damage accumulates with increased loading. Fiber breakage and matrix cracking often cause interfacial de-bonding [22]. A firm adhesive interface (ideal impregnation of matrix and strong bonding between fibers and matrix) is necessary for the efficient transfer of stress throughout the interface [23]. Modification of the interface could affect fracture modes of a UD CFRP, resulting in disparate mechanical properties [24–28]. The fracture process of a UD CFRP is not currently well understood because the process is extremely rapid (>500 m/s [29]). Ultimate failure of a UD CFRP always occurs abruptly after initiation of mesoscopic events, without any symptoms or visible signs of damage serving as an alarm. Analytical modeling of tensile failure of a UD CFRP, followed by fiber fragmentation is well established. A useful baseline is obtained by assuming that stress re-distribution around broken fiber follows global load sharing (GLS) [30,31]. This approach assumes that the load from a broken fiber is shared uniformly and equally to all remaining intact fibers across the cross-section of the break point [30–44]. Curtin [30,31] was the first to develop an analysis of the stress–strain response of a fragmenting bundle,
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کلمات کلیدی:
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