A Study on the Glassfiber Reinforcement Effect of F. R. P. E and on the Behavior of it's welded part

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In this paper we describe an experimental study on glassfiber reinforcement effectin plastic composite material of F. R. P. E and on ultrasonic weldability of F. R. P. E by batch method.Judging generally the results of experiment, relationship of lap length of glassfiber and tensile strength can be given in straight line, and so is relationship of glasscontent and tensile strength so long as glasscontent is less than 30%. Relationship of clearance and tensile strength on the other hand something like what is expressed by a curve of second degree, and clearance is desired to be as small as possible. No fiber reinforcement effect is expected unless lap length and clearance of glassfiber are within effective range. Failure in the course of tension occurs first at the tip of fiber and propagates to the side of tip. Transmission of stress by the effect of glassfiber reinforcement can be observed in photo-elastic phenomenon.In order to judge whether the welding is good or not, ratio of weld thickness servesas an effectual critertion. Welding joint efficiency of F. R. P. E was approximately 80%.
福井大学工学部の論文