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題 名 | 應力波檢測紅櫟木橢圓榫接強度=Detecting the Joint Strength of Oval-end Mortise and Tenon from red Oak by Stress Wave Method |
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作 者 | 陳合進; 陳載永; | 書刊名 | 中華林學季刊 |
卷 期 | 30:4=119 1997.12[民86.12] |
頁 次 | 頁377-386 |
分類號 | 474.11 |
關鍵詞 | 非破壞測定; 應力波; 引拔強度; 最大彎矩; Nondestructive test; Stress-wave; Withdrawal strength; Maximal bending moment; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究主要以應力波計時儀和打音頻譜分析系統之非破壞性測定法,檢測紅櫟木 製作之橢圓榫接合T-型構件之接合強度,及檢測構件缺點之可行性,並比較其與傳統破壞性 檢測接合強度之相關性。試材加工前後之波速並沒有明顯的差異,但構件組合後橫檔之波速 會減少低約15-25%;未佈膠引拔構件的波速比雙面佈膠引拔構件的波遠減低約14%。以打音頻 譜分析系統檢測構件振動頻率時,振動頻率會隨著榫頭長度之增長而增高,未佈膠引拔構件 之振動頻率(3401 Hz)比雙面佈膠構件(3824 Hz)低;構件的引拔強度會隨著構件榫頭長度增長 而提高;所有構件中以榫長40 mm的引拔強度最大(2003 kgf),而未佈膠構件之引拔強度最低 (137 kgf);榫頭寬度+0.5 mm嵌合度的構件強度會明顯的降低。構件最大彎矩方面榫頭厚度 +0.5 mm嵌合度之構件,其最大彎矩比嵌合度±0的構件大約8%;3種膠合劑對最大彎矩之影 響有顯著的差異。接合構件之引拔強度與振動頻率的迴歸分折中r□值為0.80。由此結果可 知,在引拔構件中打音頻譜分析系統可以檢測出各組構件之差異,而應力波計時儀只能檢測 出未佈膠之構件;在靜曲構件中,打音頻譜分析系統也只能檢測出未佈膠之構件,而應力波計 時儀則無法明顯的分辨各組試材之差異。 |
英文摘要 | The stress-wave nondestructive test (NDT) method was applied in this research to test the joint strength of T-type joint red oak and try to predict the joint defect. The relationship of joint strength predicted by NDT and by a tested traditional destructive method was correlated. The wave velocity showed no obviously difference before and after processing, but it was be lower in the assembled components. The wave velocity of the withdrawal components about 15~25% was 14% lower for the unglued ones comparing to the double-glued ones. The top tone vibration frequency analysis indicated that the longer ten on length showed higher frequencies. The wave velocity did not have significant difference before and after the T-type component was assembled, but it showed lower velocities after the components were assembled. While the longitudinal frequency was measured by tap tone analysis system, it was found that the value of softwood was lower than that of hardwood. The vibration frequency was positively correlated with tenon length, and the value of withdrawal of component non glued (3401 Hz) was lower than the double-spread one (3824 Hz). The withdrawal strength was positively correlated with tenon length. Among the all components, the highest withdrawal strength was 2003 kgf for 40 mm tenon length, and the lowest was 137 kgf for the case without glue. The withdrawal strength of tenon width with +0.5 mm fitness would be obviously decreased. The bending moment of the tenon thickness with +0.5 mm fitness was better than * 0 one, and there was significant variation among three kinds of glues used in this study. The correlation of withdrawal strength and bending moment between measured by destructive test and predicted by NDT was not significant tested by linear regression analysis. The different joint type which r □ value of regression analysis by withdrawal strength and vibration frequency was 0.80. It could be concluded that the tap tone frequency analysis system could be applied in prediction the variation of each component group, but the stress wave tester just be measured the components which without gluing. On the bending components side, the tap tone frequency analysis system just be measured the components which without gluing, and the stress wave tester could not be applied in prediction the variation of each component group. |
本系統中英文摘要資訊取自各篇刊載內容。