裂紋擴展判據 的英文怎麼說
中文拼音 [lièwénkuòzhǎnpànjù]
裂紋擴展判據
英文
crack extension criterion-
The consistency of the energy criterion and the stress intensity factor criterion to model i crack is discussed concisely, and the new method to calculate linear critical fracture stress is presented
藉助裂紋圓模型簡明地論述了型裂紋擴展的能量判據與應力強度因子判據的一致性以及線性斷裂臨界應力的新演算法。Based on lots of experiments, by combining the progress in mesomechanics with fea computation and analysis, this thesis investigated many parameters " effect on crack with an arc - tip in plain mixed - mode fracture, and compared existing criteria for fracture initiation, fracture direction and fracture mode transition
本文主要的工作是在試驗的基礎上，結合細觀斷裂力學當前的研究進展，通過有限元計算和模擬分析，研究了平面復合型斷裂中各種力學參量對圓弧尖端裂紋斷裂的影響，比較分析了現有的起裂判據、斷裂擴展方向的判定方法以及斷裂模式的轉換條件。Author thinks that the direction of the maximum plastic distortion along a constant radius around the crack tip may be considered as the direction of shear - mode fracture ( named pmax - criterion ) and the load when located shear band prongs the ligament in the front of crack tip is regarded as the limited load of shear - mode fracture. ( 3 ) the fad ( fracture assessment diagram ) of titled crack is proposed based on achievements of mesomechanics about i - ii complex ductile fracture of metal, and the titled crack is classified two kinds : void - mode fracture is assessed by fracture assessment curve, and shear - mode fracture by limited load. ( 4 ) using a fe program based on plantle - ressue theory to calculate some mesomechanical parameters, a flange joint structure of a high pressure vessel ( design pressure 31. 4mpa and the thickness of the hemispherical head is half of that of shell. ) is analyzed to determine whether the structure under operation pressure is safe or not, forecast the mode of potential invalidation and argue for the rationality of design of the structure
試件的整體斷裂為剪切型，但在試件芯部裂尖鈍化區中部出現了韌窩型啟裂並有一定的擴展，說明局部較高的應力三軸度也會使韌窩型機制得以發展，但是不改變試件整體的剪切型斷裂模式；對韌性斷裂的剪切模式的細觀機理做了一定的探討，並且提出了含裂紋構件剪切型斷裂的宏觀判據：認為裂紋前方的集中剪切帶中與裂紋尖端等半徑處最大有效塑性應變出現的方向可以作為裂紋剪切斷裂的方向（可簡稱為_ （ pmax ）準則） ，集中剪切滑移帶貫穿裂紋前方承載韌帶時的載荷可以作為極限載荷；本文運用金屬韌性斷裂細觀力學在一復合型韌性斷裂方面的研究成果，採用失效評定圖的形式，提出了傾斜裂紋的安全性評定方法的基本框架。Crack propagation criterion
裂紋擴展判據Crack extension criterion
裂紋擴展判據Physical grid, attained with monte - carlo simulation for grain growth, is more accurate and reasonable than the grid attained with finite element methods ( fem ). based on micromechanics and damage mechanics, proper crack propagation criterions are developed and crack propagation simulation can be finished in few seconds with common computers
跨出了細觀力學結合有限元方法模擬裂紋擴展的現有模式，從微觀尺度上模擬晶體的生長形態，結合細觀力學、損傷力學建立裂紋擴展判據，實現了快速的裂紋擴展模擬。分享友人