JP2011185790A - Delamination detecting method of laminating material and embedding method of optical fiber sensor - Google Patents
Delamination detecting method of laminating material and embedding method of optical fiber sensor Download PDFInfo
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本発明は、積層材料の層間剥離検出方法及び光ファイバセンサの埋込方法に関する。 The present invention relates to a method for detecting delamination of a laminated material and a method for embedding an optical fiber sensor.
下記特許文献１には、繊維強化プラスチック積層板の層間剥離検出方法が開示されている。この層間剥離検出方法は、繊維強化プラスチック（ＦＲＰ）等の積層板を検出対象とするものであり、積層板の層間に光ファイバを予め埋め込み、層間に剥離が発生したときに光ファイバセンサの光透過率が変化することを利用するものである。 Patent Document 1 below discloses a method for detecting delamination of a fiber reinforced plastic laminate. This delamination detection method is intended for detection of laminated sheets of fiber reinforced plastic (FRP) or the like, and an optical fiber is embedded in the interlayer of the laminated sheet in advance, and the optical fiber sensor light is emitted when delamination occurs between the layers. This utilizes the change in transmittance.
ところで、上記従来技術は、層間剥離の発生を単純に検出するものであり、剥離のメカニズムを究明するために必要な剥離の進行状態を示す情報（以下、剥離進行情報という。）を提供するものではない。積層材料の機械的な特性を評価するためには、積層材料における剥離のメカニズムを究明する必要があり、剥離進行情報が不可欠である。繊維強化プラスチック積層板等の積層材料の技術分野では、剥離進行情報を取得する技術の開発が強く切望されている。 By the way, the above prior art simply detects the occurrence of delamination, and provides information (hereinafter referred to as peeling progress information) indicating the progress of peeling necessary for investigating the peeling mechanism. is not. In order to evaluate the mechanical properties of the laminated material, it is necessary to investigate the mechanism of peeling in the laminated material, and peeling progress information is indispensable. In the technical field of laminated materials such as fiber reinforced plastic laminated boards, development of a technique for acquiring peeling progress information is strongly desired.
本発明は、上述した事情に鑑みてなされたものであり、積層材料の剥離進行情報を取得することを目的とするものである。 This invention is made | formed in view of the situation mentioned above, and it aims at acquiring the peeling progress information of a laminated material.
上記目的を達成するために、本発明では、積層材料の層間剥離検出方法に係る第１の解決手段として、積層材料の層間に複数の光ファイバセンサを一次元状あるいは二次元状に配置し、各光ファイバセンサの検出状態に基づいて剥離の進行状態を示す情報を取得する、という手段を採用する。 In order to achieve the above object, in the present invention, as a first solving means related to the method for detecting delamination of a laminated material, a plurality of optical fiber sensors are arranged in a one-dimensional or two-dimensional manner between layers of the laminated material, A means is adopted in which information indicating the progress of peeling is acquired based on the detection state of each optical fiber sensor.
積層材料の層間剥離検出方法に係る第２の解決手段として、上記第１の解決手段において、剥離を検出している光ファイバセンサと剥離を検出していない光ファイバセンサとに基づいて剥離領域と非剥離領域との境界位置を剥離の進行状態を示す情報として取得する、という手段を採用する。 As a second solving means related to the delamination detection method of the laminated material, in the first solving means described above, based on the optical fiber sensor detecting the peeling and the optical fiber sensor not detecting the peeling, A means is adopted in which the boundary position with the non-peeling region is acquired as information indicating the progress of the peeling.
積層材料の層間剥離検出方法に係る第３の解決手段として、上記第１または第２の解決手段において、各光ファイバセンサの隔離検出時間に基づいて剥離の伝搬速度を剥離の進行状態を示す情報として取得する、という手段を採用する。 As the third solving means relating to the delamination detection method of the laminated material, in the above first or second solving means, information indicating the progress of peeling in the propagation speed of peeling based on the isolation detection time of each optical fiber sensor The method of acquiring as is adopted.
また、本発明では、光ファイバセンサの埋込方法に係る第１の解決手段として、上記第１〜第３のいずれかの解決手段に係る積層材料の層間剥離検出方法における光ファイバセンサの層間への埋め込み方法であって、第１の層を構成する第１の材料片上に第２の層を構成する第２の材料片を重ねる際に、第２の材料片を複数に分割した分割材料片で各光ファイバセンサが設けられた光ファイバを挟み込むように配置し、さらに第３の層を構成する第３の材料片を重ね、第１〜第３の材料片を接合する、という手段を採用する。 Further, in the present invention, as the first solving means related to the method of embedding the optical fiber sensor, the interlayer separation detection method of the laminated material according to any one of the first to third solving means described above, to the interlayer of the optical fiber sensor. In the method of embedding, a divided material piece obtained by dividing the second material piece into a plurality of parts when the second material piece constituting the second layer is superimposed on the first material piece constituting the first layer. In this method, the optical fibers provided with the optical fiber sensors are arranged so as to sandwich the optical fiber sensor, and the third material pieces constituting the third layer are further stacked to join the first to third material pieces. To do.
光ファイバセンサの埋込方法に係る第２の解決手段として、上記第１の解決手段において、第２の材料片の厚さは光ファイバの直径と同等である、という手段を採用する。 As a second solving means relating to the method of embedding the optical fiber sensor, a means is adopted in which the thickness of the second material piece is equal to the diameter of the optical fiber in the first solving means.
本発明によれば、積層材料の層間に複数の光ファイバセンサを一次元状あるいは二次元状に配置し、各光ファイバセンサの検出状態に基づいて剥離の進行状態を示す情報を取得するので、剥離のメカニズムを究明に必要な知見を得ることができる。 According to the present invention, a plurality of optical fiber sensors are arranged in a one-dimensional or two-dimensional manner between layers of the laminated material, and information indicating the progress of peeling is obtained based on the detection state of each optical fiber sensor. Knowledge necessary for investigating the mechanism of peeling can be obtained.
以下、図面を参照して、本発明の一実施形態について説明する。
最初に、本実施形態に係る繊維強化プラスチックＡ（積層材料）の層間剥離検出方法について、上記図１〜図３を参照して説明する。繊維強化プラスチックＡは、図示するように材料本体１に複数のＦＢＧ（Fiber Bragg Grating）センサ２ａ（光ファイバセンサ）を有する光ファイバ２が埋め込まれたものである。材料本体１は、例えば第１〜第３の層ａ〜ｃからなる３層構造であり、光ファイバ２は、第２の層ｂ内に直線状に埋め込まれている。第１〜第３の層ａ〜ｃは、強化繊維の配向方向が交互に直交する関係にある。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, a method for detecting delamination of fiber reinforced plastic A (laminated material) according to the present embodiment will be described with reference to FIGS. The fiber reinforced plastic A is obtained by embedding an optical fiber 2 having a plurality of FBG (Fiber Bragg Grating) sensors 2a (optical fiber sensors) in a material body 1 as shown in the figure. The material body 1 has, for example, a three-layer structure including first to third layers a to c, and the optical fiber 2 is embedded in a straight line in the second layer b. The first to third layers a to c are in a relationship in which the orientation directions of the reinforcing fibers are alternately orthogonal.
光ファイバ２には、一定間隔で複数のＦＢＧセンサ２ａが設けられている。なお、図２では、便宜的に３つのＦＢＧセンサ２ａが設けられた状態を示している。このような光ファイバ２の一端は、光計測装置３の出射・受光端に接続されている。ＦＢＧセンサ２ａは、光ファイバ２の軸線に沿って形成された一次元の回折格子（ブラッグ回折格子）であり、ブラッグ回折格子の格子間隔に応じた波長（ブラッグ波長）の反射光を発生させる。このブラッグ波長は、層間剥離が発生して内部応力が変化すると格子間隔が変化するので、内部応力に依存して変移するものである。なお、光ファイバ２の一端は、反射が発生しないように無反射処理が施されている。 The optical fiber 2 is provided with a plurality of FBG sensors 2a at regular intervals. FIG. 2 shows a state in which three FBG sensors 2a are provided for convenience. One end of such an optical fiber 2 is connected to the emission / light reception end of the optical measurement device 3. The FBG sensor 2a is a one-dimensional diffraction grating (Bragg diffraction grating) formed along the axis of the optical fiber 2, and generates reflected light having a wavelength (Bragg wavelength) corresponding to the grating interval of the Bragg diffraction grating. This Bragg wavelength changes depending on the internal stress because the lattice spacing changes when delamination occurs and the internal stress changes. Note that one end of the optical fiber 2 is subjected to non-reflection treatment so that reflection does not occur.
本実施形態における複数のＦＢＧセンサ２ａは、各々に異なる格子間隔を有するものであり、よってブラッグ波長もそれぞれ異なる。材料本体１において層間剥離が発生して内部応力が変化すると、層間剥離の発生部位近傍のＦＢＧセンサ２ａのブラッグ波長は変移する。 The plurality of FBG sensors 2a in the present embodiment have different lattice spacings, and therefore have different Bragg wavelengths. When delamination occurs in the material body 1 and the internal stress changes, the Bragg wavelength of the FBG sensor 2a in the vicinity of the delamination site changes.
光計測装置３は、出射・受光端から光ファイバ２の一端に測定光（レーザ光または自然放射光（ＡＳＥ光））を出射すると共に、ＦＢＧセンサ２ａで反射して出射・受光端に戻ってきた反射光を受光してブラッグ波長を測定する。層間剥離によってブラッグ波長が変異しても各ＦＢＧセンサ２ａのブラッグ波長が重なり合うことがないように、各ＦＢＧセンサ２ａのブラッグ波長は十分に離間して設定されているので、光計測装置３は、ブラッグ波長の変異を各ＦＢＧセンサ２ａ毎に個別に測定することができる。このような光計測装置３は、各ＦＢＧセンサ２ａ毎にブラッグ波長を時系列データとして取得・記憶する。 The optical measuring device 3 emits measurement light (laser light or spontaneous emission light (ASE light)) from the emission / light-receiving end to one end of the optical fiber 2 and is reflected by the FBG sensor 2a to return to the emission / light-receiving end. The Bragg wavelength is measured by receiving the reflected light. Since the Bragg wavelength of each FBG sensor 2a is set sufficiently apart so that the Bragg wavelength of each FBG sensor 2a does not overlap even if the Bragg wavelength is changed due to delamination, the optical measuring device 3 The variation of the Bragg wavelength can be measured individually for each FBG sensor 2a. Such an optical measurement device 3 acquires and stores the Bragg wavelength as time-series data for each FBG sensor 2a.
以上説明したように、本実施形態における繊維強化プラスチックＡ（積層材料）は、材料本体１の第２の層ｂ内に、一定間隔で設けられると共にブラッグ波長が互いに異なる複数のＦＢＧセンサ２ａが光ファイバ２が直線状に設けられたものである。したがって、光計測装置３によって光ファイバ２の一端から入射される反射光のブラッグ波長を測定することによって複数のＦＢＧセンサ２ａのうち、何れのＦＢＧセンサ２ａのブラッグ波長が変化し、また何れのＦＢＧセンサ２ａのブラッグ波長が変化していないかを容易に判定することができる。 As described above, the fiber reinforced plastic A (laminated material) in the present embodiment is provided in the second layer b of the material main body 1 at regular intervals and a plurality of FBG sensors 2a having different Bragg wavelengths are optically transmitted. The fiber 2 is provided in a straight line. Therefore, by measuring the Bragg wavelength of the reflected light incident from one end of the optical fiber 2 by the optical measurement device 3, the Bragg wavelength of any FBG sensor 2a among the plurality of FBG sensors 2a is changed, and any FBG is detected. It can be easily determined whether the Bragg wavelength of the sensor 2a has changed.
材料本体１に発生する層間剥離は、ある箇所を起点として周囲に伝搬してある面積を有する領域として発生するものと考えられる。例えば、図２に模式的に示すように、材料本体１の左端で発生した層間剥離が左側に向けて広がったと場合、ＦＢＧ１〜ＦＢＧ３で示す３つのＦＢＧセンサ２ａについて光計測装置３が取得するブラッグ波長の時系列データは、図３に示すように、順次時刻が遅れて層間剥離（つまり合材本体１のひずみ＝ブラッグ波長の変移）を示すものとなる。すなわち、ＦＢＧ１は時刻ｔ1で層間剥離を検出し、ＦＢＧ２は時刻ｔ1よりも遅れた時刻ｔ2で層間剥離を検出し、またＦＢＧ３は時刻ｔ2よりも遅れた時刻ｔ3で層間剥離を検出する。 The delamination that occurs in the material main body 1 is considered to occur as a region having an area that propagates around a certain point as a starting point. For example, as schematically shown in FIG. 2, when the delamination generated at the left end of the material body 1 spreads toward the left side, the Bragg acquired by the optical measurement device 3 for the three FBG sensors 2 a indicated by FBG <b> 1 to FBG <b> 3. As shown in FIG. 3, the time-series data of the wavelength indicates delamination (that is, distortion of the composite material body 1 = Bragg wavelength transition) with a lag in time. That is, FBG1 detects delamination at time t1, FBG2 detects delamination at time t2, which is later than time t1, and FBG3 detects delamination at time t3, which is later than time t2.
材料本体１において、ブラッグ波長が変化したＦＢＧセンサ２ａの近傍領域は層間剥離が発生した剥離領域であり、一方、ブラッグ波長が変化していないＦＢＧセンサ２ａの近傍領域は層間剥離が発生していない非剥離領域である。したがって、各ＦＢＧセンサ２ａの層間剥離の検出／未検出は、剥離領域の境界位置や大きさを示す情報である。また、上記層間剥離の検出時刻ｔ1、ｔ2、ｔ3は、各ＦＢＧセンサ２ａの間隔が既知（固定値）なので、層間剥離の伝搬速度を与える情報である。 In the material main body 1, the region near the FBG sensor 2a in which the Bragg wavelength is changed is a separation region where delamination occurs, while the region near the FBG sensor 2a where the Bragg wavelength is not changed is not delaminated. It is a non-peeling area. Therefore, the detection / non-detection of delamination of each FBG sensor 2a is information indicating the boundary position and size of the peeling region. The delamination detection times t1, t2, and t3 are information that gives the propagation speed of delamination because the intervals between the FBG sensors 2a are known (fixed values).
次に、本実施形態に係る各光ファイバセンサ２ａの埋込方法、つまり材料本体１に光ファイバ２が埋め込まれた繊維強化プラスチックＡの製造方法について、図４〜図６を参照して説明する。なお、図５（ｂ）における第２の層ｂは、断面構造が分かり易くなるように、便宜的に第１、第３の層ａ、ｃに対する大きさを誇張して示している。 Next, a method for embedding each optical fiber sensor 2a according to the present embodiment, that is, a method for manufacturing the fiber reinforced plastic A in which the optical fiber 2 is embedded in the material body 1 will be described with reference to FIGS. . Note that the size of the second layer b in FIG. 5B is exaggerated for convenience, so that the cross-sectional structure can be easily understood.
繊維強化プラスチックＡは、上述したように３層構造の材料本体１に複数のＦＢＧ（Fiber Bragg Grating）センサ２ａ（光ファイバセンサ）を有する光ファイバ２が埋め込まれたものであるが、このような繊維強化プラスチックＡは、第１の層ａを構成する第１の材料片ａ１上に第２の層ｂを構成する２つの第２の材料片ｂ1，ｂ2を光ファイバ２を挟み込むように配置（載置）し、さらに第３の層ｃを構成する第３の材料片ｃ1を重ねた状態に配置（載置）し、さらに第１〜第３の材料片ａ１，ｂ1，ｂ2，ｃ1を全体として加熱して接合することによって製造される。 The fiber reinforced plastic A is obtained by embedding the optical fiber 2 having a plurality of FBG (Fiber Bragg Grating) sensors 2a (optical fiber sensors) in the material body 1 having a three-layer structure as described above. In the fiber reinforced plastic A, two second material pieces b1 and b2 constituting the second layer b are arranged so as to sandwich the optical fiber 2 on the first material piece a1 constituting the first layer a ( The third material piece c1 constituting the third layer c is placed (placed) in a stacked state, and the first to third material pieces a1, b1, b2, c1 are entirely disposed. It is manufactured by heating and joining.
ここで、第２の層ｂを構成する２つの第２の材料片ｂ1，ｂ2は、図５（ｂ）に示されているように、第１の材料片ａ１の幅から光ファイバ２の直径を差し引いた寸法を２等分した幅の分割材料片であり、両側から光ファイバ２を挟み込んでいる。このような第２の材料片ｂ1，ｂ2と光ファイバ２とを第１の材料片ａ１上に（載置）する場合、図４、図５（ａ）に示すように、第１の材料片ａ１の両側にダム材Ｄ１，Ｄ2を載置して光ファイバ２の両端を支持することが好ましい。 Here, as shown in FIG. 5B, the two second material pieces b1 and b2 constituting the second layer b have a diameter of the optical fiber 2 from the width of the first material piece a1. Is a divided material piece having a width obtained by dividing the size of the optical fiber 2 into two equal parts, and the optical fiber 2 is sandwiched from both sides. When the second material pieces b1, b2 and the optical fiber 2 are placed (placed) on the first material piece a1, as shown in FIGS. 4 and 5A, the first material piece It is preferable to place dam materials D1 and D2 on both sides of a1 to support both ends of the optical fiber 2.
このようなダム材Ｄ１，Ｄ2が配置された状態で第２の材料片ｂ1，ｂ2及び光ファイバ２の上に第１の材料片ａ１と同一形状の第３の材料片ｃ1を重ねる。上記ダム材Ｄ１，Ｄ2がない場合には、光ファイバ２の両端が垂れ下がることによって光ファイバ２が上下方向に湾曲して中央近傍が持ち上がるので、第３の材料片ｃ1を密着状態に第２の材料片ｂ1，ｂ2上に配置（載置）することが困難である。 A third material piece c1 having the same shape as the first material piece a1 is stacked on the second material pieces b1 and b2 and the optical fiber 2 in a state where such dam materials D1 and D2 are arranged. When the dam materials D1 and D2 are not provided, both ends of the optical fiber 2 hang down, so that the optical fiber 2 is bent in the vertical direction and the vicinity of the center is lifted, so that the third material piece c1 is brought into a close contact state. It is difficult to place (place) on the material pieces b1 and b2.
なお、第１の材料片ａ１と第２の材料片ｂ1，ｂ2とは内装される強化繊維の配向方向（繊維方向）が互いに直交関係にあり、また第２の材料片ｂ1，ｂ2と第３の材料片ｃ１とは、内装される強化繊維の配向方向（繊維方向）が互いに直交関係にある。すなわち、第２の材料片ｂ1，ｂ2における強化繊維の配向方向は、光ファイバ２の延在方向と同一であり、第１の材料片ａ１及び第３の材料片ｃ１における強化繊維の配向方向は、光ファイバ２の延在方向に直交する方向である。 The first material piece a1 and the second material pieces b1, b2 are orthogonal to each other in the orientation direction (fiber direction) of the reinforcing fibers incorporated therein, and the second material pieces b1, b2 With the material piece c1, the orientation directions (fiber directions) of the reinforcing fibers to be incorporated are orthogonal to each other. That is, the orientation direction of the reinforcing fibers in the second material pieces b1, b2 is the same as the extending direction of the optical fiber 2, and the orientation direction of the reinforcing fibers in the first material piece a1 and the third material piece c1 is The direction perpendicular to the extending direction of the optical fiber 2.
このようにして第３の材料片ｃ1の配置が完了すると、図５（ａ）に示すように、さらに光ファイバ２の両端をダム材Ｄ１，Ｄ2と一緒に挟み込むようにダム材Ｄ3，Ｄ4を配置する。そして、このような状態において、加熱炉で加熱することにより繊維強化プラスチックＡを製造する。 When the arrangement of the third material piece c1 is completed in this way, as shown in FIG. 5 (a), the dam materials D3 and D4 are further inserted so that both ends of the optical fiber 2 are sandwiched together with the dam materials D1 and D2. Deploy. And in such a state, the fiber reinforced plastic A is manufactured by heating with a heating furnace.
このような各光ファイバセンサ２ａの埋込方法によれば、図６（ａ）に示すように、光ファイバ２の周縁近傍に形成される樹脂リッチ部の面積が極めて小さい。従来では第１の材料片と同形の第２の材料片とによって光ファイバを単純に挟むことによって埋め込んでいるので、加熱する前の状態において光ファイバの周りに空隙が発生しており、この空隙に強化繊維よりも移動し易い樹脂が流れ込むことによって、図６（ｂ）に示すような大きな樹脂リッチ部が形成されている。 According to such an embedding method of each optical fiber sensor 2a, the area of the resin rich portion formed in the vicinity of the periphery of the optical fiber 2 is extremely small as shown in FIG. Conventionally, since the optical fiber is simply sandwiched between the first material piece and the second material piece having the same shape, a gap is generated around the optical fiber in a state before heating. When a resin that is more easily moved than the reinforcing fibers flows into the resin, a large resin-rich portion as shown in FIG. 6B is formed.
これに対して、本実施形態に係る光ファイバセンサ２ａの埋込方法によれば、樹脂リッチ部の面積を従来よりも大幅に縮小させることができるので、光ファイバセンサ２ａの埋込に起因する繊維強化プラスチックＡの強度低下を抑制することが可能であり、よって本来の強度に近い繊維強化プラスチックＡについて層間剥離の進行状態を示す剥離進行情報を取得することができる。 On the other hand, according to the method for embedding the optical fiber sensor 2a according to the present embodiment, the area of the resin rich portion can be significantly reduced as compared with the conventional case, and this is caused by the embedding of the optical fiber sensor 2a. It is possible to suppress a decrease in strength of the fiber reinforced plastic A, and thus it is possible to acquire peeling progress information indicating the progress of delamination for the fiber reinforced plastic A close to the original strength.
なお、本発明は上記実施形態に限定されるものではなく、例えば以下のような変形例が考えられる。
（１）上記実施形態では、第２の層ｂを構成する第２の材料片ｂ1，ｂ2の繊維方向と同方向となるように光ファイバ２を一次元的に配線したが、本発明はこれに限定されない。光ファイバ２を２次元状、例えば光ファイバ２を第２の層ｂ内における直交する２方向に配線したり、あるいは同心円状に複数配線しても良い。図６を見ても分かるように、光ファイバ２の直径は、現状では強化繊維の直径に比較してかなり大きい。しかしながら、光ファイバ２の直径を強化繊維の直径に近づけることにより、より多くの本数の光ファイバ２を材料本体１内に埋め込むことが可能となる。
In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the optical fiber 2 is wired one-dimensionally so as to be in the same direction as the fiber direction of the second material pieces b1 and b2 constituting the second layer b. It is not limited to. The optical fiber 2 may be wired two-dimensionally, for example, the optical fiber 2 may be wired in two orthogonal directions in the second layer b, or a plurality of concentric circles may be wired. As can be seen from FIG. 6, the diameter of the optical fiber 2 is considerably larger at present than the diameter of the reinforcing fiber. However, it is possible to embed a larger number of optical fibers 2 in the material body 1 by bringing the diameter of the optical fiber 2 closer to the diameter of the reinforcing fiber.
（２）上記実施形態では、ＦＢＧセンサ２ａ（光ファイバセンサ）を一定間隔で設けたが、本発明はこれに限定されない。ＦＢＧセンサ２ａの間隔は、層間剥離の進行状態を高分解能で検出したい個所には密に配置し、比較的分解能で良い箇所には祖に配置しても良い。 (2) In the above embodiment, the FBG sensors 2a (optical fiber sensors) are provided at regular intervals, but the present invention is not limited to this. The intervals between the FBG sensors 2a may be densely arranged at locations where it is desired to detect the progress of delamination with high resolution, and may be arranged at the ancestors where relatively high resolution is required.
（３）上記実施形態では繊維強化プラスチックの層間剥離検出方法において説明したが、検出対象となる積層材料、繊維強化プラスチックに限定されない。また、上記実施形態では第１の材料片ａ１及び第３の材料片ｃ１における強化繊維の配向方向を光ファイバ２の延在方向に直交する方向としたが、直交（９０°）以外の角度であっても良い。 (3) In the above embodiment, the method for detecting delamination of fiber reinforced plastic has been described. However, the present invention is not limited to the laminated material and fiber reinforced plastic to be detected. Moreover, in the said embodiment, although the orientation direction of the reinforced fiber in the 1st material piece a1 and the 3rd material piece c1 was made into the direction orthogonal to the extension direction of the optical fiber 2, it was an angle other than orthogonal (90 degrees). There may be.
Ａ…繊維強化プラスチック、１…材料本体、２…光ファイバ、２ａ…ＦＢＧセンサ（光ファイバセンサ）、３…光計測装置、ａ…第１の層、ａ1…第１の材料片、ｂ…第２の層、ｂ1，ｂ2…第２の材料片、ｃ…第３の層、ｃ1…第３の材料片 DESCRIPTION OF SYMBOLS A ... Fiber reinforced plastic, 1 ... Material main body, 2 ... Optical fiber, 2a ... FBG sensor (optical fiber sensor), 3 ... Optical measuring device, a ... 1st layer, a1 ... 1st material piece, b ... 1st 2 layers, b1, b2 ... second material piece, c ... third layer, c1 ... third material piece
Claims (5)
第１の層を構成する第１の材料片上に第２の層を構成する第２の材料片を重ねる際に、第２の材料片を複数に分割した分割材料片で各光ファイバセンサが設けられた光ファイバを挟み込むように配置し、さらに第３の層を構成する第３の材料片を重ね、第１〜第３の材料片を接合することを特徴とする光ファイバセンサの埋込方法。 A method for embedding an optical fiber sensor between layers in a delamination detection method for a laminated material according to any one of claims 1 to 3,
When the second material piece constituting the second layer is overlaid on the first material piece constituting the first layer, each optical fiber sensor is provided with a divided material piece obtained by dividing the second material piece into a plurality of pieces. A method of embedding an optical fiber sensor, comprising: placing an optical fiber sandwiched between the layers; and stacking a third material piece constituting a third layer; and joining the first to third material pieces. .
5. The method of embedding an optical fiber sensor according to claim 4, wherein the thickness of the second material piece is equal to the diameter of the optical fiber.
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| WO2016114194A1 (en) * | 2015-01-15 | 2016-07-21 | 三菱重工業株式会社 | Bonded structure, method for manufacturing same, and bonding state detection method |
| EP3001178A4 (en) * | 2013-05-14 | 2017-01-11 | Mitsubishi Heavy Industries, Ltd. | Joined structure and method for detecting joined state |
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| EP3001178A4 (en) * | 2013-05-14 | 2017-01-11 | Mitsubishi Heavy Industries, Ltd. | Joined structure and method for detecting joined state |
| US10145786B2 (en) | 2013-05-14 | 2018-12-04 | Mistubishi Heavy Industries, Ltd. | Bonded structure and bonding-condition detecting method |
| WO2016114194A1 (en) * | 2015-01-15 | 2016-07-21 | 三菱重工業株式会社 | Bonded structure, method for manufacturing same, and bonding state detection method |
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