The displacement load equations were derived by differentiating with respect to total potential energy in spline displacement function of a strip 首先對(duì)條單元以樣條位移函數(shù)表達(dá)的總勢(shì)能進(jìn)行求導(dǎo)而推導(dǎo)了位移荷載關(guān)系式。
Solving the wire loop profile for which nonlinearity mainly caused by plastic - elastic forming is a challenging work , a finite element model has been proposed to simulate the wire loop profiling , in which beam23 has been selected as calculating unit , and the trajectory of capillary is divided into many displacement loads and applied on the wire step by step 摘要針對(duì)引線成形過程中的材料非線性和幾何非線性問題,選用塑性變形梁beam23單元建立有限元模型,通過時(shí)引線分階段分步施加位移載荷模擬鍵合頭的運(yùn)動(dòng)軌跡,求解得到相應(yīng)的引線輪廓形狀。
The preferences are analyzed , pipe ’ s parameters such as depth , thickness , pipe diameter , and mechanical property of material ; soil parameters such as soil types , internal friction angle , pipe - soil interaction ; fault ’ s parameters such as fault types , fault throw , fault drop , fault - pipe angle , mechanical property of material ; load types such as gravity force , linear displacement load , seismic load and seismic wave . some conclusions are drawn from the calculating results : when buried pipes cross fault , pipe ’ s embedded depth should be shallow , and big pipe diameter and thick wall should be selected . avoid the site where fault moves severe , and select suitable pipe - fault angle 在有限元三維模型建立中考慮的因素有:管道自身參數(shù)如管道埋置深度、管壁厚度、管徑、管道材料等;巖土材料參數(shù)如土體類型、巖土的內(nèi)摩擦角、管土相互作用等;斷層考慮有斷層類型,斷層斷距,斷層錯(cuò)動(dòng)距離,斷層與管道的交角,斷層材料的考慮等;荷載分別考慮靜荷載,動(dòng)荷載,其中動(dòng)荷載包括線性位移加載、地震力加載和地震波加載等。