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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; 胡家榮; | 書刊名 | 鑄造月刊 |
卷期 | 122 1999.11[民88.11] |
頁次 | 頁26-31 |
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 FG cast irons; 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)之間的關係式。實驗結果顯示如下: Y=4.2X-0.81,Z=1.75X+2.99 而(X):衝擊動態破裂韌性;(Y):K □靜態破裂韌性(Z):韌性計算值 |
英文摘要 | The very little plastic deformation exhibited in the fracturing of flake graphite (FG) cast irons qualitied 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 impac t 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 alter their matrix structures so as to obtain a range or static (K□) and dynamic (impact) toughness values. A third toughness, calculated by integrating the area under the load vs. CGD (Crack Gage Displacement) curve in K□ testing, was termed "Calculated toughness" and was also listed for comparison purposes. It was found, among dynamic impact toughness (X), static K□ (Y), and calculated toughness (Z), linear relations hips 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. |
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