JP5294325B2 - 積層構造体、並びにその亀裂検知方法及び亀裂検知構造 - Google Patents
積層構造体、並びにその亀裂検知方法及び亀裂検知構造 Download PDFInfo
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- JP5294325B2 JP5294325B2 JP2009207257A JP2009207257A JP5294325B2 JP 5294325 B2 JP5294325 B2 JP 5294325B2 JP 2009207257 A JP2009207257 A JP 2009207257A JP 2009207257 A JP2009207257 A JP 2009207257A JP 5294325 B2 JP5294325 B2 JP 5294325B2
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- 229920000049 Carbon (fiber) Polymers 0.000 description 1
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Description
2 コア層
3 表面
4 表層
5 クラックアレスタ
8 FBGセンサ
9 可塑性材料
11 光ファイバ
Claims (7)
- 互いに積層されたコア層及び表層を接合してなる積層構造体の前記コア層に発生した界面亀裂を検知するための方法であって、
前記積層構造体が、亀裂の進展を促進させる荷重が作用しているときに亀裂先端に生じ得る応力を分担することによって該亀裂の進展を抑制するクラックアレスタと、前記クラックアレスタに埋め込まれ、定常時と歪み負荷時とで異なる反射光スペクトルを出力するFBGセンサを備えた光ファイバと、前記クラックアレスタに埋め込まれ、前記クラックアレスタが分担する応力により塑性変形可能な可塑性部材とを備え、
亀裂の進展を促進させる荷重が作用するときに前記可塑性部材を塑性変形させ、
前記亀裂の進展を促進させる荷重が除かれた後に、前記可塑性部材の残留変形により歪みが生じ得る前記光ファイバが出力する反射光スペクトルを解析し、
解析された前記反射光スペクトルの形状に基づいて、前記クラックアレスタと前記亀裂先端との間の距離を測定する、ことを特徴とする積層構造体の亀裂検知方法。 - 互いに積層されたコア層及び表層を接合してなる積層構造体の界面亀裂を検知するための構造であって、
前記コア層と前記表層との界面領域に設けられ、前記コア層に発生した亀裂先端に生じ得る応力を分担することによって該亀裂の進展を抑制するクラックアレスタと、
前記クラックアレスタに埋め込まれ、定常時と歪み負荷時とで異なる反射光スペクトルを出力するFBGセンサを備えた光ファイバと、
前記クラックアレスタに埋め込まれた可塑性部材と、を備え、
前記可塑性部材は前記クラックアレスタが分担する応力により塑性変形可能であり、塑性変形した前記可塑性部材による残留応力に基づいて前記光ファイバに歪みが生じ得る構成としたことを特徴とする積層構造体の亀裂検知構造。 - 前記クラックアレスタは亀裂の進展経路を横切るようにして直線状に延在しており、
前記光ファイバ及び前記可塑性部材は、前記クラックアレスタの延在方向と平行に延設されていることを特徴とする請求項2に記載の積層構造体の亀裂検知構造。 - 一対の前記光ファイバが、前記クラックアレスタの前記表層に沿う両端部に分かれて埋め込まれていると共に、前記可塑性部材が前記光ファイバの各々に対応して設けられていることを特徴とする請求項2又は3に記載の積層構造体の亀裂検知構造。
- 前記可塑性部材が鉛製であることを特徴とする請求項2乃至4のいずれか1項に記載の積層構造体の亀裂検知構造。
- 前記コア層が発泡合成樹脂材料からなり、前記表層が繊維強化複合材料からなることを特徴とする請求項2乃至5のいずれか1項に記載の積層構造体の亀裂検知構造。
- 互いに積層されたコア層及び表層を接合してなり、請求項2乃至6のいずれか1項に記載の亀裂検知構造を備えることを特徴とする積層構造体。
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