<b>A　Study　on　Nondestructive　Evaluation　Qf　Damage　Development　in　Carbon／Epoxy </b><b>Laminates　by　Means　of　AE　Analysis　and　Infrared　Thermal　Imaging　Stress　Analysis </b>

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  • <b>AE法と赤外線応力測定法を併用した</b><b>CFRP積層板の損傷過程の検討</b>
  • AE法と赤外線応力測定法を併用したCFRP積層板の損傷過程の検討
  • AEホウ ト セキガイセン オウリョク ソクテイホウ オ ヘイヨウシタ CFR

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Abstract

<p><tt>In　order　to　investigate　the　damage　process　and　its　nondestructive　evaluation　technique　in　carbon／epoxy　laminates，the　authors　applied　simulataneously　the　AE　analysis，the　stress　pattem　analysis　using infrared　thermal　imaging　and　soft　X ray　radiography　together　for　circularhole　notched［0°／90°］2S　laminate plates　subjected　to　monotoneously　tensile　and　cyclically　fatigue－loading． The　results　are　summarized　as　follows， （1）In　tensile　fracture　process，the　AE　event　occurs　at　the　stage　of67％of　the　ultimate　stress　and　its　AE event　has　wide amplitude　distributions　different　from　that　in　cyclically　fatigue－10ading． （2）The　initial　stage　of　damage　process　occuring　during　fatigue　loading　for　a［0°／90°］2S　Iaminate－plate with　a　circular　hole　shaped　notch　has　been　suggested　to　be　the　transverse　laminar cracks　initiated　at　the　edge of　hole　notch　and　its　propagation　accommanying delamination　between　matrix　and　fibers，by　using　both　Qf infrared　thermal　imaging　stress　analysis　and　AE　analysis．And，the　facts　suggested　by　NDT　techniques　have been　connrmed　by　Xray　radiography　and　scaming　electron　microscopic　observations， （3）It’s　concluded　that　the　simultaneous　use　of　the　infrared　thermal　imaging　stress　analysis　and　AE analysis　has　been　proposed　as　a　possible　NDT　technique　for　monitQring　of　damage　process　in　the　composite </tt><tt>materials　such　as　carbon／epoxy　Iaminates． </tt></p>

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