裂紋前緣 的英文怎麼說
中文拼音 [lièwénqiányuán]
裂紋前緣
英文
crack front-
Barrier cracks cannot stop the extending of a fracture, and the strength of the sample is reduced by almost one magnitude because of the existing barrier cracks. there are great differences of ae distribution between specimens with non - penetrate crack and specimens with penetrate crack. as for penetrate crack, ae occurs near the two end of the crack, and for non - penetrate crack, crack, ae occurs near the two end of the crack, and for non - penetrate crack, ae occurs near the front edge of crack, which can be explained well by the theory of 3 - d fracture ; ae distribution near the outer part of collinear crack is similar with that of the end of penetrate crack, and inner part of collinear cracks will run - through with high loads
關于預制裂紋系對巖石破裂的影響，集中討論了：空障礙體構造不能阻止主裂紋的擴展，反而會使巖石的破裂強度降低近一個量級；由於構造的不同，非穿透切口樣品和穿透切口樣品的聲發射空間分佈特點有本質區別，穿透切口樣品的微破裂在切口兩端發育，而非穿透切口樣品的微破裂在切口兩端之間切口前緣處發育，這用三維破裂理論可以很好地解釋；含共線構造的巖石，裂紋外端的聲發射分佈與單裂紋構造中裂紋端部的聲發射分佈相似，裂紋內端聲發射有密集分佈，在應力達到一定水平時，內端部發生錯斷，而不是貫通。According to our experimental investigations of varying load amplitude, it was found that the phenomena of fatigue crack growth retardation occurred for pmma material following a high overload cycle exerted among the regular constant amplitude load cycles, the ratio of peak value of overload to that of the regular cycles should be over at least 1. 35 to make the retardation taking effect. the experiment scheme for measuring the shutting - off ratio of overload ( defined as the overload ratio when da / dn < 10 - 7 / cyc. )
本文試驗分析了變幅載荷對裂紋擴展的影響，證實了有機玻璃也存在超載遲滯現象，通過金相觀察分析，提出超載遲滯的過程實際上是裂紋前緣萌生新的裂紋的過程的觀點，同時提出超載遲滯的合理的解析，並且給出超載遲滯比，為隨機載荷下疲勞擴展模型的建立提供了一個重要的參數。The boundary element method ( bem ) is applied to compute crack open displacement ( cod ). because of unit area being resolved or linear integrated, the efficiency and precision of boundary element analysis are improved greatly
採用裂紋張開位移全場擬合法（ gcdfp ）求出裂紋面前緣的應力強度因子（ sif ） ，所得到的sif達到與所用的裂紋張開位移（ cod ）資料同樣的精度。Brushed stripe coating to all areas such as corners. edges, welds. small brackets, bolts, nuts. rivet - s. and interstices, before spraying application of each coat, to ensure that these areas have at least the minimum specified film thickness
在塗抹新塗層前，應刷掉所有區域的麻紋，比如各角落、邊緣、焊接處、小托架、螺釘、螺帽、鉚釘和裂縫，保證這些區域至少達到價格的最低膜厚度。Plastic zone affected by crack tip curvature
裂尖曲率對裂紋前緣塑性區的影響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。Use, the operator should carefully check any errors or insulation parts crack and the main staircase linking it firmly, various accessories, such as whether the trailer, to prevent accidents
使用前，操作人員應認真檢查絕緣梯主體及零部件有無缺陷或裂紋，連接是否牢固，各種配件是否松脫等，嚴防發生意外。分享友人