Experimental studies on basalt fiber have been performed in China and abroad. Specifically, the compressive properties, flexural properties, splitting tensile properties and impact test behavior of chopped basalt fiber-reinforced concrete have been investigated. In addition, the effects of the mixing amount of fibers on the mechanical properties of C30 concrete were scrutinized, and the best mixing amount of fibers was obtained. The results indicate that the static and impact test behaviors of basalt fiber reinforced concrete significantly improved, and strengthening and toughening effects were achieved.
Abstract-We propose and demonstrate a continuous-wave all-fiber ring laser generating cylindrical vector beams (CVBs) using a MSC as transverse mode converter and mode splitter. The MSC is fabricated by a novel method free of pre-tapering, achieving LP 11 mode with a high purity of > 96% near the wavelength of 1064 nm. The CVB fiber laser operates at a center wavelength of 1053.9 nm, with a 3 dB linewidth of less than 0.04 nm and a signal-to-background ratio of > 60 dB. The laser slope efficiency is > 9%. The radially and azimuthally polarized beams can be switched by adjusting the polarization controllers in the fiber ring cavity, with a high mode purity measured to be > 96%.Index Terms-Cylindrical vector beams, optical fiber lasers, mode converter.
I. INTRODUCTIONhe cylindrical vector beams (CVBs) includes radially and azimuthally polarized beams [1]. Due to their characteristic of unique axial symmetry in both amplitude field and polarization, CVBs have been widely used in particle physics [2], optical tweezers [3], material processing [4] high-resolution metrology [5], and surface plasmon excitation [6]. Especially the radially polarized beam, which is attracting more and more attention.Various kinds of continuous-wave (CW) CVB generation techniques have been demonstrated with the use of certain spatial polarization selective elements introduced into the laser
Continuous fiber reinforced thermoplastic composites (CFRTPCs) with advantages of great mechanical properties and green recyclability, have been widely used in aerospace, transportation, sports and leisure products, etc. This study applied the 3D printing process for the integrated rapid manufacturing of CFRTPCs. The volume fraction and distribution arrangement of fiber reinforcement were designed to evaluate the effect of fiber arrangements on tensile properties of the printed composites. The experimental results proved that some outer and inner defects reduced the surface smoothness and tensile properties based on the analysis of macro and micro morphology. The fiber distributed evenly contributed to the dimensional precision and stability, as well as tensile properties. With the increasing fiber volume, the elastic modulus and ultimate tensile strength both approximately increased while the strain at break decreased. This work promises a significant contribution to the abilities of designing fiber arrangements to control tensile properties of 3D printed CFRTPCs.
Continuous fiber reinforced thermoplastic composites with advantages of high strength, long life, corrosion resistance, and green recyclability have been widely used in aerospace, transportation and high-precision processing equipment, etc. 3D printing is an advanced additive manufacturing technology that enables the rapid manufacture of complex structures and high-performance composites. The aim of this study is to evaluate the precision and stability of 3D printed continuous fiber reinforced thermoplastic composite structures and construct suitable mathematical models to predict tensile properties. Samples evaluated in this study were produced by varying the volume fraction and distribution mode (average and central mode) of fibers within the printed structures. The measured data proved the continuous fiber reduced the printing precision on width and thickness and the printing stability on thickness, while it improved the width stability in the XY horizontal plane. The printing precision and stability of samples with an average mode were slightly better than those of samples with a central mode. The tensile results of 3D printed continuous fiber reinforced thermoplastic composites demonstrated that an increasing volume of fiber reinforcement resulted in the increasing stiffness and ultimate strength of tested samples. The average elastic modulus and ultimate tensile strength of samples with the average mode were higher than those of samples with the central mode, while the average strain at break was quite the opposite. Mathematical models of elastic modulus were established to achieve the relative errors 0.06% and 2.14% for checked samples, while relative errors of the mixing rule were up to 76.15% and 81.71%, respectively. Some typical defects affecting the surface quality and the fracture behavior of 3D printed samples were researched by the analysis of micromorphology.
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