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DEVICE AND METHOD FOR EVALUATING POROSITY IN COMPOSITE MATERIAL

外国特許コード F180009656
整理番号 3983
掲載日 2018年11月21日
出願国 世界知的所有権機関(WIPO)
国際出願番号 2014JP006147
国際公開番号 WO 2015098010
国際出願日 平成26年12月9日(2014.12.9)
国際公開日 平成27年7月2日(2015.7.2)
優先権データ
  • 特願2013-266732 (2013.12.25) JP
発明の名称 (英語) DEVICE AND METHOD FOR EVALUATING POROSITY IN COMPOSITE MATERIAL
発明の概要(英語) In this porosity evaluation method, one surface of a composite material having a multilayer structure is set as the incidence surface, an ultrasonic wave enters from the incidence surface in the thickness direction of the composite material, and the reflected waves (the entirety of reflected waves) are received from the incidence surface. Next, the received entirety of reflected waves is subjected to a time-frequency analysis. Thus, the information included in the entirety of reflected waves about the change over time of the reflected waves (interlayer reflected waves) from the interfaces between the layers of the multilayer structure is acquired. This change information is used to optimally evaluate the thickness-direction porosity distribution in the composite material.
従来技術、競合技術の概要(英語) BACKGROUND ART
In recent years, it has been used in the field of metallic materials, fiber-reinforced resin composite material (hereinafter, appropriately 'composite material' abbreviated.) Has been widely used.For example, carbon fiber as the fibrous reinforcement material (carbon fiber) is used, the matrix comprising the epoxy resin or the like which is impregnated with the resin material by molding a carbon fiber-reinforced type (in general, carbon fiber reinforced plastic (CFRP) is referred to.) Is, in addition to being lighter than the metal material, from a higher strength, especially in recent years, sports equipment, industrial machinery, a vehicle (a car and a bicycle), such as aerospace fields employed.
Is a molded product made of composite material, in general, a plurality of sheets of prepreg (the fibrous reinforcement material sheet made from a matrix resin such as the impregnation material is added to a) are stacked, the resulting laminate is pressurized and heated by an autoclave (pressure cooker) obtained by curing.
Here, when curing the laminate prior to the pressure applied by the heating temperature or, in the interior of the composite material 'porosity' referred to as a large number of defects in the form of a number of fine pores can occur in the dispersion.When a predetermined amount of porosity in the composite there is one or more, resulting in deterioration of the structural strength of the composite material.In particular, aerospace composite material when used in the field, as compared with other fields for demanding regarding the structural strength, the amount of porosity should be reduced as much as possible.Therefore, when manufacturing a composite material, the porosity required for non-destructively assess.
Conventional, non-destructively assess defects of the composite material as a technique, for example, to Patent Document 1 disclosed an ultrasonic inspection method, or, as disclosed in Patent Document 2 of the ultrasonic inspection apparatus can be used.Each of these techniques, both the composite material used in the aeronautical mainly the target.Then, in each of the techniques, from the surface of the composite material (composite) the thickness direction of the incident ultrasound, or the back surface of the rear surface of the measurement of the reflected wave of the transmitted wave is measured, the degree of attenuation of the transmitted wave or reflected wave, transmitted wave or reflected wave or based on the attenuation properties, and the inspection for defects of the composite material.
  • 出願人(英語)
  • ※2012年7月以前掲載分については米国以外のすべての指定国
  • Kawasaki Heavy Industries, Ltd.
  • KYOTO UNIVERSITY
  • 発明者(英語)
  • BIWA, Shiro
  • KURAISHI, Akira
国際特許分類(IPC)
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