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一、木内学方法简述定义一个假想单元,如图1中的E~*单元所示。这个单元与所要分析的模具表面接触,其接触面S~*很小。首先按常规求出工件变形所需的上限功率W。这时,模具的运动速度为(?)。然后利用上限元法分析工件的不规则变形,假想单元接触面的速度为(?)+Δ(?)~*,其余面仍为(?)。在此条件下求出其上限功率(?),但计算时忽略Γ_1~*、Γ_2~*面上的剪切功率。总的(?)可表达为下面三个式子之和: (?)=((?)_E~*)+((?)_Ⅰ)+((?)_Ⅱ) (1) 其中,(?)_E~*为假想单元内的总功率,(?)_Ⅰ为第Ⅰ
First, a simple method of learning wood Definition of a hypothetical unit, as shown in Figure 1 E ~ * unit shown. This unit is in contact with the surface of the mold to be analyzed, and its contact surface S ~ * is small. First of all, according to the conventional work required to find the upper limit of deformation W power. At this time, the mold movement speed (?). Then the upper bound element method is used to analyze the irregular deformation of the workpiece. The velocity of the contact surface of the imaginary element is (?) +? (?) ~ * And the remaining surfaces are still? (?). Under these conditions, the upper limit power (?) Is obtained, but the shear power on Γ_1 ~ * and Γ_2 ~ * surfaces is neglected in the calculation. The total (?) Can be expressed as the sum of the following three formulas: (?) = ((?) _E ~ *) + ((?) _I) + ((?) _II) _E ~ * is the total power in the imaginary unit, (?) _ Ⅰ is Ⅰ