Yasuto Kataoka

Practical use of statistically modified laminate model for injection moldings

Abstract Injection molded fiber reinforced materials offer designers the opportunity to reduce part count in a wide range of consumer products. However, flow induced orientation of the fiber results in anisotropy of material properties, and can lead to concerns regarding stiffness and warpage. In previous work the authors introduced a method for predicting anisotropic stiffness, and evaluating warpage, for this class of materials using empirical data derived from tests performed under conditions close to those used in manufacturing. In this paper the method is used to predict with a high degree of accuracy the variation in bending stiffness within a corner injected plate. It is also used to illustrate sensitivity in linear and buckling warpage modes, and show how small changes in process conditions can completely change the predicted warpage pattern.

AN EXPERIMENTAL STUDY ON EFFECTS OF MOUND ON HYDRAULIC CHARACTERISTICS OF THE FLARING SHAPED SEAWALL

A Flaring Shaped Seawall (FSS), a new type of one, can drastically reduce a crest height and wave overtopping quantity in comparison with a conventional upright one. The FSS will usually be set on a mound from the point of a cost of manufacturing and construction. Thus, in this paper, effects of the mound on hydraulic characteristics of the FSS (a wave overtopping rate, a wave run-up height and a reflection coefficient) are clarified from experiments using a two-dimensional flume. Furthermore a method for the FSS on the mound is proposed, and it is shown that the method is adequate under the condition of experiments in this paper.

STUDY ON CHARACTERISTICS OF TRANSPORT OF SPRAY AND SOUND ENVIRONMENT BY NON-WAVE-OVERTOPPING TYPE SEA WALL

Authors have proposed a non-wave overtopping type seawall (Flaring Shaped Seawall) with deep circular cross section in order to facilitate a safe and excellent use of coastal space for various purposes. The seawall satisfies a non-wave overtopping condition with extremely lower crown height in comparison with conventional upright seawall. In this study, wind field near the seawall, water spray transported behind the seawall and sounds when waves running up were measured in the experiments, and compared with an upright seawall.

Reduction of Impulsive Breaking Wave Pressures by Wave Dissipating Works with Low Crest Elevation

Low crested wave dissipating works with low void content were considered in this study to reduce the impulsive breaking wave pressures acting on a non-wave overtopping type seawall. The wave transmission coefficient and wave pressure distribution were measured through two dimensional wave tank experiments. The numerical computation based on Greens Identity Formula was also applied to estimate the transmission coefficient. The wave transmission coefficient decreases linearly with decreasing of the void content. The maximum wave pressures also decrease linearly with decreasing of the void content, and the variations of the maximum wave pressures depending on the relative water depth become small.