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題 名 | 片狀石墨鑄鐵動態與靜態韌性關係之研究=Relationship between Dynamic and Static Toughness of Flake Graphite Cast Iron |
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作 者 | 李深智; 許正勳; 施議訓; | 書刊名 | 鑄工 |
卷 期 | 25:1=100 1999.03[民88.03] |
頁 次 | 頁36-42 |
分類號 | 472.2 |
關鍵詞 | 片狀石墨鑄鐵; 衝擊韌性; 破裂韌性; K咹; Flake graphite cast irons; FG; Impact toughness; Fracture toughness; |
語 文 | 中文(Chinese) |
中文摘要 | 片狀石墨(Flake Graphite, FG)鑄鐵由於受力變形時產生的塑性變形極小,故可 視為典型的脆性材料,在求取K□值(Plane-Strain Fracture Toughness,或稱Static Toughness即靜態破裂韌性)就無此困擾。且脆性材料之力學行為屬彈性行為,在衝擊試驗中 斷口平整屬脆性破壞,此與K□試驗必須滿足之線性彈性的條件不謀而合。因此就脆性材料 而言,此兩種韌性之間,是否有線性的相關性,是本研究探討的重點。 本研究以片墨鑄鐵為基本材料,分別經退火熱處理、正常化處理及沃斯回火熱處理以造 成機械性質之變化,求取靜態韌性值、動態韌線性值及韌性計算值(Calculated Toughness, 定義為K□試驗中Load(荷重)vs. CGD (Crack Gage Displacement)曲線下面積之積分值)之 間的關係係。實驗結果顯示如下: Y=4.2X-0.81, Z=1.75X+2.99 而(Y):K□靜態破裂韌性;(Z):韌性計算值;(X):動態破裂韌性。 |
英文摘要 | The very little plastic deformation exhibited in the fracturing of flake graphite (FG) cast irons qualified them as brittle materials. The fatigue precracking of these brittle material in K□ plane strain fracture toughness testing is a difficult task. Opposed to this static toughness K□, the dynamic toughness obtained by impact testing does not have such bottleneck. Since the stress-strain behavior of brittle material is essentially linear, and the fracture appearance of the specimens after impact testing must largely be flat without shear-lip, these conditions also satisfy the linear-elastic requirement in K□ testing. Thus, it is of interest to find out if there's any linear relationship existed between these two toughness properties of brittle material. Annealing, normaling, and austempering heat treatment, were applied to FG irons to after their matrix structures so as to obtain a range of static (KCI) and dynamic (impact) toughness values. A third toughness, calculated by integrating the area under the load vs. CGD (Crack Gage Disoplacement) curve in KIC testing, was termed "Calculated toughness" and was also listed for comparison purposes. It was found, among dynamic impact toughness (X), static KIC (Y), and calculated toughness (Z), linear relationships exist for flake graphite cast iron as: Y=4.02X-0.81, Z=1.75X+2.99 where Y: static K□;, X: dynamic impact toughness; Z; calculated toughness. |
本系統中英文摘要資訊取自各篇刊載內容。