短繊維-熱可塑性樹脂複合材料の疲労の温度上昇に及ぼす応力比と界面接着性の影響  [in Japanese] Effects of Interfacial Adhesive Property and Stress Ratio on Temperature Increase of Short-Fiber Reinforced Thermoplastics under Fatigue Loading  [in Japanese]

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Abstract

本研究では熱可塑樹脂(ポリプロピレン)短繊維複合材料の疲労損傷に対する応力比の影響を検討した。樹脂とガラス繊維の界面強度増大のためアミノシランカップリング剤を用い,一方,界面強度を低下させるためにウレタンタイプのサイジング剤を用いた。疲労試験は応力比Rを0,-1または∞で行い,疲労中の応力-ひずみの関係と試験片表面温度を測定した。同じ繰返数ではR=∞の疲労強度はR=0より50%も大きく,R=0では温度上昇は他の応力比より大きい。R=∞では複合材料の温度の増大は樹脂と同程度に小さい。それは樹脂と複合材では疲労損傷機構が異なるためである。R=0では疲労中における複合材の温度の増大は繊維の末端付近で大きな引張り応力を受ける樹脂の減衰効 果から生じる。しかし,R=∞では周囲の応力は繊維の座屈のために繊維末端に負荷されない。温度 の増大の影響を除いて,25°Cの一定試験片温度で疲労試験すると,疲労中の温度上昇を制御しなかった場合と比べて疲労寿命は100倍以上増大した。温度が増大する疲労試験では粘性破面が現れたのに対して,25 ℃の疲労試験では脆性破面が観察された。

The effect of stress ratio on the fatigue failure of short-fiber reinforced polypropylene (PP) was investigated. An amino silane coupling agent was employed to improve the interfacial adhesion between PP and glass fiber, and a urethane type sizing agent was applied to deteriorate the adhesion. Fatigue tests were carried out at stress ratios of 0, -1, and ∞. The stress-strain relationship and the surface temperature of the specimens were measured during fatigue. The fatigue strength for R=∞ was 50% lager than that for R=0 for the same number of cycles to failure, and the temperature increase for R=0 was greater than that at other stress ratios. The surface temperature at R=∞ of the composite was almost identical of that of the resin. It must have come from the difference in the fatigue damage mechanism between composites and the resin. Temperature increase of the composite during cyclic loading at R=0 may have come from the damping effect in high-tension stressed resin around the ends of fibers. However, at R=∞ stress around them may have been much smaller than that for R=0 because of the buckling of fibers under compressive stress. To remove the effect of temperature increase, the fatigue test was carried out under the constant specimen temperature of 25 °C, and it was found that the fatigue life was 100 times longer than that obtained from the uncontrolled test where the specimen temperature increase during fatigue. For the fatigue test at 25 °C, the brittle fracture surface was observed, while ductile fracture surface appeared for the temperature increase fatigue test.

Journal

  • Journal of The Adhesion Society of Japan

    Journal of The Adhesion Society of Japan 38(4), 116-123, 2002-04-01

    The Adhesion Society of Japan

References:  8

  • <no title>

    日和千秋

    機械学会論文集A編 65, 631, 1999

    Cited by (1)

  • <no title>

    古江治美

    材料 46, 10, 1997

    Cited by (1)

  • <no title>

    倉鋪憲

    第28回FRPシンポジウム講演論文集 113, 1999

    Cited by (1)

  • <no title>

    日和千秋

    溶接構造シンポジウム'99 183, 1999

    Cited by (1)

  • <no title>

    Standard test method for determining the compressive properties of polymer matrix composite materials using a combined loading c, 2000

    Cited by (1)

  • <no title>

    日和千秋

    日本接着学会誌 35(1), 21, 1999

    Cited by (1)

  • <no title>

    成澤郁夫

    材料強度学 304, 1982

    Cited by (1)

  • <no title>

    日本レオロジー学会編

    レオロジー 113, 1992

    Cited by (1)

Codes

  • NII Article ID (NAID)
    10008011247
  • NII NACSIS-CAT ID (NCID)
    AN10341672
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09164812
  • NDL Article ID
    6147546
  • NDL Source Classification
    ZP16(科学技術--化学・化学工業--高分子化学・高分子化学工業)
  • NDL Call No.
    Z17-134
  • Data Source
    CJP  NDL  J-STAGE 
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