The surface ladder effect produced by prototyping principle is analyzed , and the calculation method of the part surface roughness is presented . the selecting method of slice thickness and sintering layer thickness when slicing the cad model and sintering is presented 分析了由于成型原理所產(chǎn)生的制件表面階梯效應(yīng),提出了制件表面粗糙度的計算方法,給出了cad模型切片時,切片厚度的選取方法。
Accordring to basic concept and assumes essentially on the basic of sweden method of slices , be living below the maximum equilibrium state , the function expression about stability safety homogeneous slop is deduced , and the slope surface is consist of two lines and an arc , afterwards according to analysis theory of minimal value ruling on the basic of the maximum , genetic algorithm is applied to slove the dangerousest slide situation and radius and corresponding safely factor 根據(jù)瑞典圓弧法的基本概念和基本假定,在極限平衡狀態(tài)下,推導(dǎo)了兩直線段均質(zhì)斜坡穩(wěn)定性安全系數(shù)函數(shù)表達式,然后根據(jù)極限分析理論的極小值原理,利用遺傳算法,求出了邊坡穩(wěn)定性安全系數(shù)極小值,并得到最危險滑動面的滑弧半徑和滑弧中心坐標。
This model not only could bring the efficiency and accuracy of fem into full play but also could utilize the rich experience in using the method of slices . at last , the influence on stability of various factors when water level falls has been analyzed . furthermore , as stresses in the stress field influence the value of seepage coefficient , which will results in the change of seepage field in the end , while on the other hand , the seepage field also has an effect on the stress field because of seepage forces 此外,考慮到應(yīng)力場中的應(yīng)力會改變土體滲透系數(shù)進而影響滲流場,而滲流場也因其產(chǎn)生的滲透力會導(dǎo)致應(yīng)力場發(fā)生變化,兩者之間存在耦合作用,針對某一具體算例,通過ansys軟件和自編程序,分別對不考慮應(yīng)力影響下的滲流場和不考慮滲流影響下的應(yīng)力場以及兩場相互耦合時的穩(wěn)定性進行了研究,得出了一定規(guī)律。