The elastic solution for elastic - plastic problem is based on model theory of elastic - plasticity and deformation theory of plasticity . with the original data which embodies the stress state of complicated structure at elastic phase and is attained by experiment or calculation , according to the similarity theory between elasticity and plasticity and generalized stress - strain material curves , and using new means and new techniques , this method and change the elastic value into plastic value correspondingly 結構彈塑性分析的彈性解法是以彈塑性力學的模型理論和塑性力學形變理論為基礎的,具體做法是利用實際工程中由實驗或者計算等方法獲得表征復雜結構彈性階段應力狀態(tài)的原始數據,根據彈性力學和塑性力學方程的相似關系和被實驗材料的廣義應力應變曲線,采用新的分析方法和實驗手段,將彈性解轉換成對應的彈塑性解。
Abstract : incompatible element nh11 and hybrid stress element 18 were employed to analyze rock burst occurring in coal face 9108 of sanhejian coal mine . compared with the results from ansys , the two optimized fems can execute more accurate numerical simulation in the research of rock burst as well as other rock problems and lessen the errors from inaedquately meshing in huge calculations due to the limitation of labor and computer time . in addition , the criterion of averaged generalized stress rate was proposed and used to determine the site and moment of rock burst . the given conclusion is in accordance with the face of coal face 9108 very well 文摘:利用優(yōu)化非協調元和雜交元分析了三河尖礦沖擊礦壓,并與ansys程序的計算結果進行了比較.認為優(yōu)化有限元在沖擊礦壓乃至巖石材料的數值模擬中能給出更為精確的結果,也可減小大型計算中由于人力、機時所限粗分網格產生的誤差.分析中,采用了廣義平均應力率準則來判斷沖擊點位置和沖擊時刻,所得結論與實際情況吻合
The corresponding control equation is given . the control equation and boundary condition about the addiontional small deformation ' s effect caused by initial stress using virtual principal theory in cylindrical reference frame . generalized stress and strain and equivalent constitutive equation are given 第四章提出了描寫柱形薄殼中初應力的數值特征,將應力的三維分布轉化為二維分布,給出相應的支配方程;在柱坐標系中,利用虛功方程建立了初應力對附加小變形影響的控制方程和邊界條件;給出了廣義應力、廣義應變及等效本構關系。