有鑒於本文所研發 SHPB 試驗機尚在校核階段,尤其動態試驗對於感測器、擷取、
放大與濾波器的頻寬要求非常嚴格,因而有待更多測試,校正與改良才能畢竟其功。
因此本研究結果係屬初步成果,後續將再深入探討。另外,應變片澆水一般耐溫性約 150℃,故在高溫下如何確保其功能亦可再研究。
七、參考文獻
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八、計畫成果自評
本研究計畫之主要目的荏整合機械、土木、電機、控制專長,以研發本土化 岩石三軸(含溫控)SHPB 試驗設備,包括擊發控制系統、入射與穿射、傳統三 軸室和溫控三軸室以及電腦控制、擷取系統等,並用以研究岩石動態力學行為,
包括速率、溫度、濕度影響效應等,俾以瞭解岩石依時環境作用下,其力學行為。
在研究期間已設計、製造和校正自研發而具有岩石三軸室和溫度控制之 SHPB 試 驗機,並用以進行荷載速率、圍壓,濕度和溫度對泥岩力學性質之影響。
研究結果亦顯示以鋁桿作為輸入與輸出桿並配合精密型應變片而可量測得 壓桿之入射、反射及穿射應力波。尤其隨著荷重速度增加,泥岩強度亦隨之增加,
其增幅約為靜態強度之 4.15~4.55 倍。隨圍壓增大靜、動態強度亦隨之增大,而 且動態增加之幅度大於靜態強度。此外,由於泥岩具有親水性,隨著含水量的增 加,泥岩的靜、動態強度均隨之減少,當泥岩含水量大於 10%時,其功軟化現象 已不甚顯著。泥岩也具有熱敏性,因而泥岩的動態強度隨著溫度增加而減少,但 隨著荷重速度的增加,其強度上有增加之現象。
考核本計畫,無論在儀器設計、構件加工、組也裝校核與泥岩的環境測試,
均以初步達成計畫目標,並有繼續再研發、推廣及應用之可能性。