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Amimul Ahsan - One of the best experts on this subject based on the ideXlab platform.

  • a study of abrasive water jet machining process on glass epoxy Composite Laminate
    Journal of Materials Processing Technology, 2009
    Co-Authors: M. A. Azmir, Amimul Ahsan
    Abstract:

    Abstract Surface roughness (Ra) and kerf taper ratio (TR) characteristics of an abrasive water jet machined surfaces of glass/epoxy Composite Laminate were studied. Taguchi's design of experiments and analysis of variance were used to determine the effect of machining parameters on Ra and TR. Hydraulic pressure and type of abrasive materials were considered as the most significant control factor in influencing Ra and TR, respectively. Due to hardness of aluminium oxide type of abrasive materials, it performs better than garnet in terms of both machining characteristics. Increasing the hydraulic pressure and abrasive mass flow rate may result in a better machining performance for both criteria. Meanwhile, decreasing the standoff distance and traverse rate may improve both criteria of machining performance. Cutting orientation does not influence the machining performance in both cases. So, it was confirmed that increasing the kinetic energy of abrasive water jet machining (AWJM) process may produce a better quality of cuts.

  • A study of abrasive water jet machining process on glass/epoxy Composite Laminate
    Journal of Materials Processing Technology, 2009
    Co-Authors: M. A. Azmir, Amimul Ahsan
    Abstract:

    Abstract Surface roughness (Ra) and kerf taper ratio (TR) characteristics of an abrasive water jet machined surfaces of glass/epoxy Composite Laminate were studied. Taguchi's design of experiments and analysis of variance were used to determine the effect of machining parameters on Ra and TR. Hydraulic pressure and type of abrasive materials were considered as the most significant control factor in influencing Ra and TR, respectively. Due to hardness of aluminium oxide type of abrasive materials, it performs better than garnet in terms of both machining characteristics. Increasing the hydraulic pressure and abrasive mass flow rate may result in a better machining performance for both criteria. Meanwhile, decreasing the standoff distance and traverse rate may improve both criteria of machining performance. Cutting orientation does not influence the machining performance in both cases. So, it was confirmed that increasing the kinetic energy of abrasive water jet machining (AWJM) process may produce a better quality of cuts.

M. A. Azmir - One of the best experts on this subject based on the ideXlab platform.

  • a study of abrasive water jet machining process on glass epoxy Composite Laminate
    Journal of Materials Processing Technology, 2009
    Co-Authors: M. A. Azmir, Amimul Ahsan
    Abstract:

    Abstract Surface roughness (Ra) and kerf taper ratio (TR) characteristics of an abrasive water jet machined surfaces of glass/epoxy Composite Laminate were studied. Taguchi's design of experiments and analysis of variance were used to determine the effect of machining parameters on Ra and TR. Hydraulic pressure and type of abrasive materials were considered as the most significant control factor in influencing Ra and TR, respectively. Due to hardness of aluminium oxide type of abrasive materials, it performs better than garnet in terms of both machining characteristics. Increasing the hydraulic pressure and abrasive mass flow rate may result in a better machining performance for both criteria. Meanwhile, decreasing the standoff distance and traverse rate may improve both criteria of machining performance. Cutting orientation does not influence the machining performance in both cases. So, it was confirmed that increasing the kinetic energy of abrasive water jet machining (AWJM) process may produce a better quality of cuts.

  • A study of abrasive water jet machining process on glass/epoxy Composite Laminate
    Journal of Materials Processing Technology, 2009
    Co-Authors: M. A. Azmir, Amimul Ahsan
    Abstract:

    Abstract Surface roughness (Ra) and kerf taper ratio (TR) characteristics of an abrasive water jet machined surfaces of glass/epoxy Composite Laminate were studied. Taguchi's design of experiments and analysis of variance were used to determine the effect of machining parameters on Ra and TR. Hydraulic pressure and type of abrasive materials were considered as the most significant control factor in influencing Ra and TR, respectively. Due to hardness of aluminium oxide type of abrasive materials, it performs better than garnet in terms of both machining characteristics. Increasing the hydraulic pressure and abrasive mass flow rate may result in a better machining performance for both criteria. Meanwhile, decreasing the standoff distance and traverse rate may improve both criteria of machining performance. Cutting orientation does not influence the machining performance in both cases. So, it was confirmed that increasing the kinetic energy of abrasive water jet machining (AWJM) process may produce a better quality of cuts.

Jianxiang Wang - One of the best experts on this subject based on the ideXlab platform.

  • The stress intensity factor of an inclined crack embedded in the central layer of an angle-ply Composite Laminate
    2016
    Co-Authors: Shu Li, Jianxiang Wang
    Abstract:

    The effect of transverse cracks in fibre-reinforced Composite Laminates on the properties of the Laminates has been extensively studied, but most studies are devoted to cracks that are perpendicular to the interfaces. It is noted that inclined cracks may occur in Composite Laminates when subjected to transverse shear. In this paper, the stress intensity factor of an inclined crack embedded in the central layer of an angle-ply Composite Laminate is solved by the Fourier integral transform method. The relationship between the stress intensity factor and the geometrical parameters of the Laminate, including the crack orientation angle, ply angle and thickness of the outer constraining subLaminates, is explored. The results show that when the thickness of the outer constraining subLaminates is more than twice that of the central layer, the influence of the thickness of the outer constraining subLaminates on the stress intensity factor is negligible, while the influences of the ply angle  and the crack orientation angle are significant. We also examine the propagation of the inclined crack under a mixed I-II mode, and find that the fracture direction of the crack is primarily determined by the relative size of the crack and the inclination angle.

  • A study of the propagation of an embedded crack in a Composite Laminate of finite thickness
    Composite Structures, 2003
    Co-Authors: Taoling Yang, Jianxiang Wang
    Abstract:

    In this paper, the mechanism for the propagation of a crack embedded in the central layer of a Composite Laminate is studied based on energy criteria. As the crack may propagate in the transverse direction or in the tunneling direction, the critical stresses for these two propagations are presented. The theoretical analysis is applied to a fibre-reinforced Composite Laminate. Critical stresses for the initiation of crack propagation are calculated taking into account the influence of the adjacent ply angle and the crack size. It is found that for the considered typical fibre-reinforced Composite Laminate, the critical stress for the transverse propagation is less than that for the tunneling propagation. Therefore, transverse cracking is a more possible fracture mode in Composite Laminates with initial crack-like defects. This finding supports the calculation of the in situ transverse strength based upon the transverse crack propagation.

Sanliang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • influence of fabric structure and thickness on the ballistic impact behavior of ultrahigh molecular weight polyethylene Composite Laminate
    Materials & Design, 2014
    Co-Authors: Diantang Zhang, Li Chen, Sanliang Zhang
    Abstract:

    Abstract This paper presents the influence of fabric structure and thickness on the ballistic impact behavior of Ultrahigh molecular weight polyethylene (UHMWPE) Composite Laminate. UHMWPE Composite Laminates, reinforced by three kinds of fabric structures, unidirectional prepreg, 2D plain-woven and 3D single-ply orthogonal woven fabrics, were fabricated via hot pressing curing process. Through a series of standard ballistic tests, we demonstrated that unidirectional Composite Laminates exhibit higher ballistic impact velocity and absorbed energy capacity compared to others. A bi-linear relationship was found between the ballistic limit velocity and specimen thickness. Furthermore, the dominant failure mechanisms of unidirectional Composite Laminates were identified to be plugging and hole friction for thin Laminates, whereas delamination, fiber tension and bulging for thick ones.

Chungon Kim - One of the best experts on this subject based on the ideXlab platform.

  • simultaneous monitoring of strain and temperature during and after cure of unsymmetric Composite Laminate using fibre optic sensors
    Smart Materials and Structures, 2003
    Co-Authors: Hyunkyu Kang, Donghoon Kang, Changsun Hong, Chungon Kim
    Abstract:

    In this paper, we present a simultaneous measurement of strain and temperature during and after cure of unsymmetric cross-ply Composite Laminate using fibre-optic sensors. Fibre Bragg grating/extrinsic Fabry–Perot interferometric (FBG/EFPI) hybrid sensors are used to measure those measurands. The characteristic matrix of the sensor is derived analytically and measurements can be done without sensor calibration experiments. A wavelength-swept fibre laser is utilized as a light source. Two FBG/EFPI hybrid sensors are embedded in a graphite/epoxy unsymmetric cross-ply Composite Laminate in different directions and different locations. We perform the real-time measurement of fabrication strains and temperatures at two points within the Composite Laminate during the cure process in an autoclave. Also, the thermal strains and temperatures of the fabricated unsymmetric Laminate are measured afterward in a thermal chamber. Through these experiments, FBG/EFPI sensors are proven to be an efficient choice for smart monitoring of Composite structures.