To comprehend the fatigue failure mechanism at the fiber discontinuity in fiber-reinforced composites, it is necessary to evaluate the local mechanical behaviors. The fatigue strength depends on the stress distribution at the fiber inclusion corner. An improved advanced finite element method (IAFEM) is proposed for the stress intensity factor (SIF) analysis at the fiber inclusion corner. In the IAFEM, the element stiffness matrix of singular inclusion corner element (SICE) is obtained, and the singular elastic field at the tip of the fiber inclusion is determined. The effects of load direction, fiber distribution, fiber geometry, and material properties on SIFs are analyzed numerically using the IAFEM. The difference in stress field distribution between two-dimensional and three-dimensional fiber inclusions is discussed. The IAFEIM and calculation results can provide reference for fatigue strength analysis and preparation of composite materials.
Abstract. Increasing development of tourism has become an important industry in our country. With the professional quality analysis and literature consult, this paper initially establishes the competency of guides model, and investigtes the tourist guide competency, using the AHP to determine the weight of each elements. Finally, the ways to improve the competency of the tour guide are put forward from three aspects of perfect training mechanism, design reasonable incentive, so as to create a good development environment for development.
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