熱壓修補用於經預疲勞週次及衝擊後的Gr/PEEK積層板對拉伸疲勞壽命的影響

The Influence of Thermoforming Repair Method on fatigue Life of GR/PEEK Laminates after Impact and Pre-Cycle

邱永川(Yung-Chuan Chiou) ； 陳保松(Paw-Song Chen) ； 葉銘泉(Ming-Chuen Yip)

《農業機械學刊》 13卷2期 (2004/06) Pp. 19-28

https://doi.org/10.30062/JAM.200406.0002

摘要

本研究所需之損傷基材，包括受到能量衝擊損傷、預疲勞週次損傷及這兩者雙重下造成的損傷，係先以Gr/PEEK 積層板材料進行衝擊試驗及應力等級定為靜態拉伸強度75%的預疲勞週次試驗所得。針對此三種不同類型的損傷基材與原材比較其受損前後的U.T.S.值及疲勞壽命改變情況，並探討這三種損傷型式在熱壓修補下對拉伸疲勞壽命的影響。熱壓修補方面，應用「二因配置法」進行分析，顯示溫度250℃為影響修補的主要參數，因此選取不同溫度對不同類型損傷的積層板材料分別進行修補試驗，期將此實驗結果供作日後修補之參考依據。同時探討熱壓修補前後對疲勞壽命改善狀況。實驗中發現，熱壓修補不但無法改善受損傷材料的疲勞壽命且會由於高溫的作用，令基材劣化導致疲勞壽命降低。

關鍵字

CFRP ； 疲勞 ； 熱壓修補 ； 預疲勞 ； 衝擊

並列摘要

Three damaged types of specimens that include low energy-impact damage, precycle loading damage and low energy-impact added pre-cycle loading damage are needed in this study. The low energy-impact damage is produced by impact testing machine work done on the aquasi-isotropic Gr/PEEK laminate. And the damage form
of pre-cycle loading is obtained from the aquasi-isotropic Gr/PEEK laminate subjected to repeated loading that adopted the 75 % ultimate strength as the stress amplitude.
The degree of the effect of the various damaged from on the ultimate strength and fatigue life are presented by comparing the tested results of the damaged specimens to the tested results of virgin specimens in this study. Furthermore, the effect of the damaged specimens repaired by thermoforming method on the fatigue life is discussed. In the case of repairing by thermoforming method, the temperature of 250℃ is the major parameter in repairing by using two-level factorial designs. Thus, the various damaged specimens are repaired by thermoforming method at various temperatures. Furthermore, comparing the fatigue life between the damaged
specimens and the damaged specimens with repairing by thermoforming, the improvement of damage is shown and is a reference. According to the experimental results for the damaged aquasi-isotropic Gr/PEEK laminate, the fact that the thermoforming method can't improve the fatigue property due to the high temperature effect is found.

並列關鍵字

CFRP ； Fatigue ； Thermoforming repair ； Impact ； Pre-cycle