دانلود رایگان مقاله لاتین فیبر شبه استاتیکی از سایت الزویر
عنوان فارسی مقاله:
مدل جدید نظری مساله خروج تک فیبر شبه استاتیکی : معیار مبتنی بر انرژی با روند تخلیه
عنوان انگلیسی مقاله:
A new theoretical model of the quasistatic single-fiber pullout problem: The energy-based criterion with unloading process
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
It is well known that the efficiency of load transfer across the interface plays a significant role on the mechanical behavior of fiber-reinforced composites [2]. Interfacial debonding and frictional sliding are two main contributors to enhance the toughness of composites. Interfacial strength should be large enough to enable the stress transfer from matrix to fibers. Meanwhile, interfacial strength should be sufficiently low compare with the fiber strength so that the toughness of composite can be enhanced through the interfacial debonding. When debonding occurs, the frictional sliding is the main contributor to the dissipated energy in composite. If the friction is too large, the energy dissipated owing to debonding and pullout will be limited since the debonded region will be small when the fiber breaks. However, if the friction is too small, the pullout work will also be limited even through the debonded region tends to be large. Several experimental tests, such as single fiber pullout/pushout tests, mircobond, fragmentation and so on, are designed to measure the interfacial properties of composite. Among these test methods, single fiber pullout test has been widely applied to measure both interfacial strength and friction stress. A number of theoretical models have been developed to analyze the stress transfer between the fiber and matrix across the interfaces since first analytic model was developed by Cox [3]. Either a constant friction [4] or Coulomb friction [1,5] is adopted to describe the interfacial frictional sliding in the debonded region. Zhou, Kim and Mai studied the influence of loading method on the stress distributions in the constituents [6]. A few models are developed to analyze the multi-fiber pull-out tests through a three-cylinder model [5,7]. Qing reviewed those basic assumption and limitations of these theoretical models, and developed a new theoretical model in which all relevant stress and strain component have been took into account and all the stress boundary conditions are fulfilled [1]. Recently, Yao et al. investigated the effect of an inhomogeneous interphase on the mechanism of stress transfer [8]. Upadhyaya and Kumar investigated the interphasial/interfacial stress transfer in a three-phase fiber-reinforced composites [9]. Two different criteria to describe the interfacial debonding interfacial strengths are commonly adopted in the models: the interfacial shear strength [10e12] and the potential energy release rate [13e17]. The purpose of the present study is to optimize the application of the single-fiber pullout test in evaluating the interfacial properties. As is pointed out that the interfacial strength and interfacial friction are two main factors to affect the mechanical properties of composites. Normally, these two factors are coupled and have to beextracted from the experimental test. Based on the modified analysis of stress [1], a theoretical model is developed to establish the relation between the applied stress and relative displacement during the loading-unloading process. In the unloading process, there is only frictional sliding and no new debonding occurs. That's to say, we can obtain the frictional coefficient through the analysis of unloading process. After we have obtained the frictional properties of interface, we can obtain the interfacial strength, the potential energy release rate of interface in the present study, through analysis the loading process. As a model example the hypothetical glass fiber/epoxy composite is adopted. The influence of radial residual thermal stress, fiber pullout rate, fiber volume contents and model length on applied stress/debonded length and applied stress/relative displacement relationships is investigated.
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کلمات کلیدی:
A new theoretical model of the quasistatic single-fiber pullout problem ... orbit.dtu.dk/.../a-new-theoretical-model-of-the-quasistatic-singlefiber-pullout-problem-a... A new theoretical model is developed in order to predict the stress transfer during the quasistatic single-fibre pullout process. The theoretical approach retains all ... Theoretical model of fiber debonding and pull-out in unidirectional ... journals.sagepub.com/doi/abs/10.1177/0021998314540191 by Q Meng - 2015 - Cited by 3 - Related articles A theoretical model is developed to study the fiber debonding and pull-out in .... new theoretical model of the quasistatic single-fiber pullout problem: analysis of ... [PDF]Simulation of fiber debonding with friction in a model composite ... sottosgroup.beckman.illinois.edu/papers/nrs025.pdf by G Lin - 2001 - Cited by 74 - Related articles c Department of Theoretical and Applied Mechanics, University of Illinois at ... The interface failure observed in quasi-static fiber pushout tests performed on a model ... Keywords: Fiber pullout; Fiber pushout; Friction; Fiber reinforced composite; ... a model composite (Fig. 1) involving a single fiber composite system. The fiber. Hai Qing - Editorial Board - Scientific Research Publishing https://www.scirp.org/journal/DetailedInforOfEditorialBoard.aspx?personID=7941 Hai Qing serves as the editorial board member in Modeling and Numerical Simulation ... A new theoretical model of the quasistatic single-fiber pullout problem: ...
