Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: właściwości rozciągające

Sortuj według:

Ogranicz wyniki do:

Recent developments in pullout behaviors and tensile properties of ultra-high-performance concrete reinforced with steel fiber

Wu Hansong, Zang Zhishu, Deng Shiyi, Shen Aiqin, Cai Yanxia, Ren Guiping, Pan Hongmei

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 3

art. no. e216, 2023

Ultra-high-performance concrete (UHPC) has gained significant attention as a construction material owing to its exceptional mechanical properties and durability. Steel fibers are widely utilized as a reinforcement material for UHPC. Achieving excellent bond and tensile performances is considered to be a predominant issue for the utilization of steel fiber reinforcement. This comprehensive review presents recent research progress on the bond and tensile properties of steel-fiber-reinforced UHPC. First, an overview of the experimental methods for evaluating pullout and tensile performance is provided. Subsequently, the factors influencing these properties are discussed in detail. The review then comprehensively examines several analytical models for steel-fiber-reinforced UHPC, ranging from traditional approaches to innovative methods such as artificial neural network models, genetic algorithms, deep learning methods, inverse analysis, and micromechanical damage models. Furthermore, the correlations between pullout behavior, tensile performance, and flexural strength are explored in detail. Finally, the review addresses essential considerations and summarizes various modification techniques for improving the pullout and tensile performances, including physical and chemical methods of modifying the steel fiber surface and UHPC matrix. This review serves as a valuable reference for researchers and engineers in relevant fields, promoting further research and application of steel fiber-reinforced UHPC.

Mechanism of Failure in Staple Yarns under the Uniaxial Loading in Terms of Fibres Disposition and Distribution in Yarn

Cybulska M., Goswami B. C.

Fibres & Textiles in Eastern Europe

2001

Vol. 9, no. 4 (35)

20--23

The mechanism of failure in staple yarns has been analysed in terms of some parameters of the yarn structure. The technological process imposes certain constraints in the disposition and distribution of fibres along yarn axis and in the yarn cross-section. The tensile behaviour of ring, open end, air-jet and vortex yarns has been studied. The yarns were subjected to uniaxial loading on a tensile tester. The images of yarn before and after the break were recorded, and some characteristics of fibre distribution and disposition in yarn were determined on the basis of image analysis. The analysis of the failure region yielded some interesting features, and indicated some typical mechanisms occurring in different yarn structures.

Mechanizm destrukcji w przędzach z włókien odcinkowych jest w dużym stopniu uwarunkowany strukturą przędzy. Metoda wytwarzania narzuca pewne ograniczenia w ułożeniu i rozkładzie włókien wzdłuż osi przędzy i w jej przekroju poprzecznym. Analizie poddano mechanizm destrukcji w przędzach klasycznych, bezwrzecionowych, pneumatycznych i wirowych. Przędze poddane były rozciąganiu na zrywarce. Rejestrowano obraz przędz przed i po zerwaniu. Analiza zarejestrowanych obrazów ukazała pewne interesujące właściwości i pozwoliła przedstawić typowe mechanizmy destrukcji, zachodzące w różnego rodzaju strukturach przędz. Mechanizm destrukcji dla każdego typu struktury zanalizowany jest w funkcji podstawowych parametrów ułożenia i rozkładu włókien w przędzy.