裂紋擴展增量 的英文怎麼說
中文拼音 [lièwénkuòzhǎnzēngliáng]
裂紋擴展增量
英文
incremental crack extension-
: 36 < kth < 37 mpa / m3 / 2, 42 < kih < 44mpa / m3 / 2, 51 < kc < 52 mpa / m3 / 2 through the sem fractography, it is know that the susceptibility to brittle failure at room temperature is more than below 100 ?. and the susceptibility to brittle failure increase with hydrogen increasing, under the sustained loading, ductile cracking appears. the quantity of brittle cracking is more with crack growth
T44mpa m 『 q ， sl lt52mpa in 』 」斷口分析表明，該合金充氫后其室溫時的氫脆敏感性大於100oc時的氫脆敏感性；且隨氫含量升高，氫脆敏感性增加：在恆載荷的作用下，該合金裂二紋開始擴展時顯示的是韌性起裂；隨裂紋增長，試樣脆性斷裂的比例增大。It is found that cyclic loading at high differential stress level will lead to the decrease of felicity ratio, and the value max can be decreased by some crack systems in specimen. there is still a lot of ae during unloading at high differential stress level, which implies that the deformation is dominated by fracturing at low differential stress level, and the deformation by frictional sliding increases greatly at high differential stress level
關于應力方式對巖石破裂的影響，發現較高差應力水平下的多次循環加卸載會使felicity比減小；某些構造能使巖石產生felicity效應的應力門檻值_ （ max ）降低；由高差應力水平下卸載時仍有大量聲發射產生推測：在低差應力水平下，破裂以裂紋尖端的突然擴展為主；在高差應力水平下，沿已有的裂紋面的滑動破裂大量增加。A global crack - line displacement fitting procedure ( gcdfp ) for computing stress intensity factors ( sif ) has been developed. the precision of sif is compatible with the corresponding cod data
使用paris公式求出裂紋前緣各點的裂紋擴展增量，並用三次b -樣條函數對這些增量進行擬合，得到新的光滑裂紋前緣。Taking in - situ toughened silicon nitride as a design object, principle component analysis ( pca ) is applied to study the microstructure and mechanical properties, to find out the main microstructure controlling factors, and to simplify the characterization variables and criterions ; fuzzy neural networks ( fnns ) is also applied to develop a design expert system for this material, which can realize the forward prediction from processing, microstructure to mechanical properties, and backward design from mechanical properties or microstructure to processing ; monte - carlo method is applied to simulate the grain growth of this material, and then crack propagation is simulated, which is another way based on physics and chemistry to developing prediction models from processing until to mechanical properties
本文以自增韌氮化硅陶瓷為設計對象，運用主成分分析法（ principlecomponentanalysis ： pca ）對自增韌si _ 3n _ 4陶瓷的顯微結構和力學性能進行數據空間降維，獲得自增韌si _ 3n _ 4陶瓷顯微結構控制的主要因素，進而簡化了表徵參量變量和準則；運用模糊神經網路（ fuzzyneuralnetworks ： fnn ）建立了自增韌si _ 3n _ 4陶瓷設計專家系統，能實現工藝?微結構?性能的正向預測及反向設計；運用monte - carlo方法（ mc ）進行自增韌si _ 3n _ 4陶瓷的晶體生長模擬，然後進行裂紋擴展模擬，探索建立工藝?微結構?力學性能預測模型的思路。Test results showed that the fatigue crack propagation rare increased with increasing the pre - tension deformation degree, especially at the near threshold section
結果表明：隨著預拉伸變形量的增加，疲勞裂紋擴展速率提高，尤其是在裂紋擴展的近門檻區。At the same time, the energy absorbed in the crack propagation phase decreases relatively that lead to overall energy absorption of the composites increases slightly, it is greater than 12. 89 %. by observing the appearance of the damage area, it can be found that the mode of damage is influenced by the interfacial shear strength. if the interfacial shear strength is low, fiber pull - out is the primary energy - absorbing mechanisms, whereas the dominant energy - absorbing mechanisms changes into fiber / matrix debonding and delamination when the interfacial shear strength is stronger
界面剪切強度增加后，材料的沖擊極限載荷有所增加，在裂紋起始區吸收的引發能增加較多，其中增強纖維經等離子體處理6分鐘的試樣所吸收的引發能增加了18 . 57 % ;由於裂紋擴展階段所吸收的能量相對有所下降，材料總的能量吸收能力雖有所改善，但增加不多，其中界面剪切強度增加最多的試樣，吸收的總能量增加了12 . 89 % 。Under load, the number of the micro - cracks increases ; the micro - cracks expand and eventually become macro - cracks, which result in the failure of the structure
在載荷作用下，微裂紋的數量增加，擴展最後變成宏觀裂紋，從而導致結構的破壞。分享友人