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題 名 | 孔隙對雜質顆粒導致延性金屬應力集中的影響=Effect of Porosity on the Stress Concentration Induced by Second Phase particles in Ductile Metals |
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作 者 | 李秉乾; 陳百豪; | 書刊名 | 逢甲學報 |
卷 期 | 32 1997.12[民86.12] |
頁 次 | 頁69-78 |
分類號 | 440.2 |
關鍵詞 | 應力集中; 延性破壞; 含孔隙金屬; 雜質顆粒; Stress concentration; Ductile fracture; Porous metals; Second phase particles; |
語 文 | 中文(Chinese) |
中文摘要 | 金屬延性破壞的機制主要為孔隙的生成,成長及連結,而雜質顆粒往往是孔隙生 成的主因。對於等軸顆粒而言,孔隙的生成主要是因為顆粒與基材界面的剝離,而對於長形 顆粒而言,孔隙的生成則主要是因為顆粒的斷裂。本文以一無限大的基材包含單一剛性圓球 顆粒承受軸對稱的遠距外力為模型題目,模擬延性金屬含有稀薄、分佈均勻、硬而且脆的等 軸顆粒受外力後與基材界面應力集中的現象。基材組成律採用能模擬含孔隙金屬力學行為的 Gurson 變形理論,希望能藉此進一步了解雜質顆粒和孔隙間互動的關係。 在顆粒與基材界 面剝離的過程中,界面正向應力扮演著關鍵的角色。本文採用修正的 Hill 變分原理,配合 Rayleigh-Ritz 法,來求解模型題目之應力場。其中特別專注於探討在不同組成參數以及三 軸遠距外力作用下,顆粒與基材界面之正向應力集中因子。 |
英文摘要 | The fracture of ductile solids has been observed to result from the initiation, growth, and coalescence of microscopic voids. It is generally established that such cavitation is associated with second phase hard particles. For equiaxed particles, it has been observed that voids initiate by decohesion of the particlematrix interface, in contrast, particles with large aspect ratios which are oriented in the tensile axis often fracture before interfacial debonding occurs. The model problem employed in this study is an rigid spherical inclusion embedded in an infinite martix subject to an axisymmetrical remote loading. The matrix material is considered to obey in the Gurson's constitutive theory, for that the porous metal is specialized to a small deformation of power-law solids containing voids. A modified potential energy will be developed in a form appropriate to the model problem, and a Rayleigh-Ritz procedure will then be employed to minimize this functional. The analysis is concentrated on the stress distribution along the matrix inclusion interface and the shape of the plastic zone in the matrix material. |
本系統中英文摘要資訊取自各篇刊載內容。