本計畫以三維動顯函有限元素程式分析金屬薄板微引伸成形，並以微拉伸試驗機擷取銅箔材料參數，帶入程式中進行圓杯微引伸與方杯微引伸之成形性分析，完成不同模具尺寸微引伸成形之沖頭負荷、主應力分佈、主應變分佈、杯高分佈及厚度分佈之模擬。在尺寸效應方面，本計畫將料片厚度及晶粒大小導入材料應力-應變構成式，並利用適當之猜測值，以期使用單一方程式就能準確預測不同料片厚度及晶粒大小之應力-應變曲線，結果顯示，與單純應力-應變構成式相比，導入尺寸效應因子的應力-應變構成式差距皆在5%以內。 The 3-D dynamic finite element program was used to analyze the micro deep-drawing of metallic thin sheet. The material properties of cooper foil were obtained from the micro tensile test machine. The material properties substituted into the program to analyze the formability of the cylindrical-cup and square-cup micro deep-drawing. Simulations of punch loads, principal stress distributions, principal strain distributions, cup height distributions, and the thickness distributions in the micro deep-drawing process on different tool size were achieved through the use of the explicit dynamic finite element program. In the discussion of size effect, this project combined the thickness and grain size into the stress-strain relation. A set of proper values was imported to predict the stress-strain curve by only one equation. The result showed that the difference between the original stress-strain relation and stress-strain relation combined with the thickness and grain size was within 5%.
