There are the two limitations for both of the cable method and beam method : ( 1 ) it can only analyze the response of pipeline under tensile loading ( < 90 ) 現(xiàn)有的理論分析方法和梁模型有限元方法都難以分析管截面發(fā)生大變形的情況,例如屈曲變形。
When temperature increases , deformation will develop under post buckling conditions , and it is difficult to describe axial force with analytic method , so numerical method is used 以此為基礎,分析管柱升溫時的軸向力和變形,確立計算步驟和邊界點的處理方法。
When the crossing angle is larger than 90 degree , the pipeline would prone to suffer a buckling damage ; ( 2 ) it cannot be used to analyze the large deformation in the pipe section 現(xiàn)有的殼模型有限元方法雖然可以分析管截面中的大變形情況,但是,由于在斷層作用下受影響的管子的范圍比較長,需要耗費大量的計算時間。
The stress state in the stainless steel pipe - titanium alloy pipe - nitinb shape memory alloy connector system is analyzed by using the theory of solid mechanics and the recovery rules of nitinb shape memory alloy with constrains on the basis of analysis of the structure of the connector system and the all steps in the preparation and the service . a mathematical model for the strength was proposed . the temperature dependence of connecting force and the maximal stress intensity in the pipe connector in the process of preparation and service was studied by programming and computing . the computing results show that the difference of heat expansile coefficient between the coupling material and the pipe material leads to the strength of connector system at room temperature less than the strength at high temperature 通過分析管接頭結構以及制備、使用的各個步驟,運用固體力學的基本理論,結合nitinb形狀記憶合金在約束下的回復規(guī)律,對不銹鋼- -鈦合金管- -四川大學碩士論文nitinb形狀記憶合金管接頭系統(tǒng)內的應力狀態(tài)進行了理論分析,建立了強度的數(shù)學模型,通過編程計算,研究了不銹鋼一鈦合金管一nitinb形狀記憶合金管接頭系統(tǒng)裝配及使用過程中的抱緊力以及最大應力強度隨溫度變化的規(guī)律。