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In this study, several measuring techniques by using uluasonic waves have teen developed. The measured physical quantities are I ) the solidification behavior of the filled plastics in a cavity. 2) the pressure in a cavity, 3) the melted behavior of resin pellets in the barrel, 4) the thickness of the molded parts, S) the velocity of sound of the molded parts, in the injection molding process, 6 ) the workpiece shape and roughness in the machining process, 7) the surface condition of a grinding wheel, 8) the solidification behavior during the curing process of adhesive and so on. These quantities are obtained by measuring the amplitude and traveling time of ultrasonic waves.

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In this study ， stress distribution and de偽 ation at the joining p 飢 of the connecting sha 丘 with tceth subjected to extemal bending moment w ¢ re investigated by using 3D − FEM analysis ． Those results were compared to 血 e resu 耽s under tensile and compressive leads ， to examine 血 e e 蹶 s of 山 e difference of ］ oad configuration on the mechanical characteristics ． To Gonfiml the validity of analytioal results ， we perfbrmed 3 − points bending test ancl measured the strain distribution at the joining part ． In addition ， effects of rotational arigles in the circumferential direction ef the conneCting shaft ， that is ， the effects of directions of the bending moments acting on thejoining part on m hanical characteristics were examined ， Key Mords：FEM ， Stress concentration ， Connecting shaft ， Bending moment ， Stress analysis