It is concluded that the coulomb - type crack model is suitable for simulation of the interfacial fracture under mixed - mode fracture loads , however further work is still needed for improvement of its dilatancy properties 通過對數(shù)值結果的分析比較得出結論:庫侖型裂紋模型比較適合模擬復雜載荷下的界面斷裂行為,但是其擴容特性仍有待改善。
Artificial nerve network forecasted yso in clay p - y curves is researched and 8 physical parameters are studied by using the principal component analysis method when the fracture load was not reached for a trial pile under lateral load , the ultimate load of the pile might be predicted to the field - surveyed load settlement data of existing trial pile and by h - s curve extension method and hyperbola method 在對粘性土p - y曲線計算參數(shù)y _ ( 50 )的研究中,對粘性土常規(guī)8個物理性質指標進行主成分分析,研究用人工神經(jīng)網(wǎng)絡分析預測粘土p - y曲線中的y _ ( 50 ) 。建立了神經(jīng)網(wǎng)絡計算模型,可用來計算預測粘性土p - y曲線中的y _ ( 50 ) 。
The method for measuring the plane strain fracture toughness klc has been introduce to high polymer bonded explosives ( pbx ) by systematically studying technologies concerning the shape of specimen , the depth and its machining of crack , the loading rate , the measurement of critical fracture load , and the computation of klc , etc . the method has been used to test and study klc of three typical high polymer bonded explosives which are j2 , jl , j3 respectively both at normal temperature and unmoral temperature 本文以高聚物粘結炸藥為研究對象,對測試高聚物粘結炸藥的平面應變斷裂韌度所涉及的樣品形狀、裂紋深度及裂紋制備、加載速度、臨界斷裂載荷p _ q的確定及平面應變斷裂韌度k _ ( ic )的計算等方面進行深入研究,建立了較為完善的炸藥平面應變斷裂韌度測試方法。
Aiming at the simulation of quasi - brittle fracture of concrete - like materials , the qualitative comparison of the selected models was focused on the follow aspects , i . e . the simulation of the fracture behaviors of crack mode and crack mode by use of the selected models and the simulation of dilatancy properties of the selected models under mixed - mode fracture loading conditions 在對選擇的典型黏性界面裂紋進行定性分析比較時著重考慮以下兩點:采用選擇的模型對型裂紋和型裂紋的斷裂行為進行數(shù)值計算;對混合型斷裂載荷作用下模型的擴容行為特性進行數(shù)值分析。