Papers by Keyword: Stitching

Abstract: Experiment of fur fashion design principles and production technology on the use of Jirong rabbit. Starting with fur clothing trends , according to fashion design principles combined with Rex Rabbit hair characteristics , summarized in harmony with color , pattern strengthen decorative effect , deconstruction design reflects the balance and the dividing line reflects the golden ratio . Edging effect reflects the rhythm of Rex Rabbit fashion design principles. And do exploration practices on aspects of the whole fur stitching practices, Choudao technology, and other fabric stitching methods.

Abstract: Proposed a new stitching algorithm to suit for coal mine. Cross-power spectrum phase information is used to coarse matching fast and overlapping regions can be found. Invariant features are extracted by using the dimensional reduced SIFT algorithm-sample principal component analysis. RANSAC combined with iterative L-M nonlinear optimization algorithm can improve projection matrix. New algorithm can improve the matching efficiency, and it’s suit for coal mine environment.

Abstract: The study on deformation in impact-damaged graphite-fibre/epoxy stitched composite plates subjected to compressive load is presented. A delaminated cross-ply laminate [03/903]S obtained in low-velocity impact test has been examined using a self-designed anti-buckling device in compressive experiment. The out-of-plane displacement field of the specimen has been measured with an optical whole-filed measurement technique, which is carrier electronic speckle pattern interferometry (carrier-ESPI). Finite element (FE) simulation is also carried out to predict the deformation. The effect of the stitching line on compressive deformation is discussed for various stitched laminates. Finally, the numerical results are compared with experimental measurement deformations under different compressive loads.

Abstract: Stitched woven composite π joints and paralleled samples without stitching were investigated by numerical analysis under tensile loading. The effects of stitching on the mechanics behavior of composite π joints are presented. Stitching technique can reduce initial failure load of composite π joint, but remarkably improve the rupture load. The failure process of composite π joint, including the damage onset, propagation path and final failure pattern, is also limited in the stitched area. The failure mechanisms are expatiated by the numerical data and failure picture to obtain more knowledge about the mechanics behavior of composite π joints.

Abstract: For the measurement of areal surface texture, a non-contact measurement method for areal surface texture based on the co-integration of optical microscopy image measurement and white light microscopy interference measurement is proposed, which measures not only 2D size of length but also 3D surface texture. Based on this method, a 2D&3D optical microscopy measurement system for areal surface texture has been developed. It consists of compound optical microscopy imaging system, 3D precision displacement system, hardware circuit, and corresponding software. The practicality and effectiveness of the proposed method of measurement have been verified by the measurement results.

Abstract: Optical profiler is a typical modern device for precision form error measurement. In our use of the equipment, we found that the surface form profile after stitching is ambiguous if the lens magnification is changed. The error in terms of PV value can be up to 3200% when the lens magnification changes from 2.5 times to 30 times. This has been confirmed by the equipment supplier. It is worthwhile to offer a comprehensive study as many users may use the instrument of the kind straightforward without detailed investigation of the performance. We found that, among the 6 key parameters studied, 3 independent parameters are more important. For the 3 independent parameters, we recommend to set the magnification A=2.5 times, the resolution r=0.5, and the overlap p=20%. With the recommended settings, the measurement error can be less than 0.5%. Backscan and length for scanning in the vertical direction, and cut off frequency for delivering form profile are less critical compared with the three independent parameters.

Abstract: In the present paper, effects of through-the-thickness stitching of delaminated glass/epoxy composite laminates with two different types of aramid threads, Kevlar® and Twaron® threads, on the buckling loads are studied. The buckling loads are predicted based on the Southwell, Vertical displacement and Membrane strain plot methods from the experimental data. Flexural modulus of the stitched and unstitched glass/epoxy composite laminates, knot tensile strength of Kevlar® and Twaron® stitching threads are obtained experimentally. From the Southwell, Vertical displacement and Membrane strain plot methods it is observed that stitching either by Kevlar® or Twaron® threads is effective in improving the buckling strength of glass/epoxy composite laminates when the delamination length is greater than 0.5L, L is the length of the laminate.

Abstract: Through-thickness stitching is one of the most effective techniques to improve the delamination resistance of composite laminates. The effects of two different stitching patterns on the mode-I interlaminar fracture toughness of unidirectional carbon fiber reinforced plastics (CFRP) are examined experimentally in the present paper by using the double cantilever beam (DCB) test method. It is found that the zigzag stitching pattern results in a better toughening effect than the straight line pattern, and that the stitching density also has a considerable influence on the mode-I fracture toughness.