crack front 中文意思是什麼

crack front 解釋
斷裂前沿
  • crack : vt 1 使破裂；敲破，敲碎，砸碎（陶器等）；嗑（瓜子等）；【化學】裂化（石油等）。2 把（槍打得、鞭子...
  • front : n 1 前部，前面；正面；（劇場的）正面[前面]座位〈也可指全部觀眾席位〉 （opp back rear）。2 【軍事...
  1. He kept the front wheels astride the crack as he followed its zigzag course.

    他在使前輪分跨裂縫的同時曲曲折折前進。
  2. He keeps the front wheels astride the crack as he followed its zig-zig course.

    他在使前輪分跨裂縫的同時曲曲折折前進。
  3. A whole regiment of crack c. i. d men had been thrown into the front lines to find out who he was.

    為了查明真相，整整一個團的老練的罪犯調查部隊人員被派到前線來。
  4. The main results and academic contributions of the dissertation can be summarized as following : 1 ) for the difficulty to obtain the accurate analytical solution of the stress constraints around 3d cracks, detailed 3d fe analyses have been conducted to study the out - of - plane constraint factor tz around a straight through - thickness crack, a quarter - elliptical corner crack and a semi - elliptical crack embedded in an isotropic elastic plate subjected to uniform remote tension loading. the distributions of tz are minutely studied in the forward section of the cracks. strong 3d zones ( tz > 0 ) along the crack front were investigated despite the far field stress - free boundary conditions

    全文主要研究內容和學術貢獻如下: 1 .針對一般三維裂紋端部場應力約束準確解析的困難，對均勻拉伸載荷作用下各向同性彈性板中穿透厚度中心直裂紋、半橢圓表面裂紋和1 / 4橢圓角裂紋進行了大量詳細的全場應力三維有限元分析，首次全面分析了非穿透裂紋端部場三維影響區范圍，給出了不同形狀三維裂紋前沿離面應力約束因子tz的數值解，並結合k場平面解給出了非穿透裂紋端部應力場k - tz雙參數描述。
  5. Local cleavage fracture might happen in the front of crack tip

    純鎂斷裂時裂尖前方可能發生局部解理開裂。
  6. 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。
  7. While in the zigzag thin area, the crack can only propagate by zigzag manner. in the fracture of titanium, deformation twins might forme in the front of crack

    裂紋在帶狀薄區中可以直線擴展，也可以呈z字形擴展，而在z字形薄區中裂紋只能呈z字形擴展。
  8. Another one has already formed in the hard phase in front of the steel basic phase when a crack incubates in the steel basic phase

    當裂紋在鋼基體相中孕育時，另一裂紋已在該鋼基體相區前沿的硬質相中形成。
  9. The micromechanisms of fracture in engineering materials have been studied in this thesis, with particular emphasis on the dislocations behavior in the front of crack tip and the processes of crack nucleation and propagation on nanometer scale. the relation between the microprocesses of fracture and the macromechanical behaviors were investigated, which will be helpful to the strengthening and toughening of engineering materials

    本文首先對材料斷裂文獻進行綜述，了解斷裂微觀機理研究的過去成就、現狀和發展，確定本文研究的內容為工程材料斷裂的微觀機理，側重裂尖微區位錯行為和納米尺度上微裂紋形核與擴展過程及微觀組織的影響，斷裂微觀過程與宏觀力學行為的關系，為工程材料的強韌化提供理論依據。
  10. Many dislocations were emitted from the grainboundary in the front of crack and were driven out of grain boundary area, leaving dislocation free zone in the front of grainboundary. a concept of grainboundary dislocation free zone is proposed. the deformation in the front of crack tip in magnesium was single slip, which resulted in the thinning in the area of crack tip

    首次發現裂尖前方晶界對裂尖發射的位錯有排斥作用，裂尖前方的晶界可以向晶界兩側晶粒發射位錯，位錯從晶界發出后迅速離開晶界向前運動，形成晶界無位錯區，首次提出晶界無位錯區的概念。
  11. 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。
  12. The size and shape of the crack front were updated using the result of finite element program, and then the crack propagation was simulated by moving the node

    利用有限元計算的結果來自動更新裂紋前沿的尺寸和幾何形狀，並使用節點移動法來模擬裂紋的擴展過程。
  13. Unknown displacement and electric potential jumps in the integral equations are approximated with a product of fundamental density function and polynomials, in which the fundamental density function reflects singular behavior of electroelastic fields near the crack front and the polynomials can be reduced to a real constant under uniform loading

    超奇異積分方程中的未知位移間斷和電勢間斷近似地表示為基本密度函數與多項式之積，其中基本密度函數反映了橢圓片狀裂紋前沿電彈性場的奇異性，而多項式在均布載荷作用下可用一個常數來表達。
  14. And then a laminar structure was formed in the front of the crack tip. a microcrack might nucleate at the crack tip and propagate ahead perpendicular to the laminar structure

    首次發現純鎂裂尖變形以單系滑移為主，其斷裂過程是滑移減薄，形成層狀結構，然後裂紋垂直於層狀結構擴展。
  15. The echo of single hole was high, its front was steep edge ; the echo of dense hole was connected and uneven ; the echo of crack was high and keen - edged, the bottom echo was decline in some certain ; the echo root of bird ' s net had some small wave followed

    單個孔洞反射回波高，前沿較尖銳；密集氣孔回波參差不齊，根部互相連接；裂紋回波高而尖銳，底波有所下降； 「鳥巢」缺陷的反射波根部有若干小波峰出現。
  16. Sold like an id card, nigga, no needs ta front, so here to torment up a track on crack and i m strapped witta semi - toll milli - ten mac

    遠遠見我癡癡的想伴著這結他仍傻頭傻腦正唱著這曲送你伴著你走的方向難明心中我痛傷
  17. Bruce went into a low gear and drove at a terrifying speed, keeping the front wheels astride the crack as he followed its zigzag course

    布魯斯掛上慢檔，把兩只前輪分別擱在裂縫的兩邊，順著彎彎曲曲的裂縫，以發瘋的速度向前開去。
  18. The research work of the thesis include mainly : ( 1 ) observe a phenomenon which the two fracture modes are simultaneously found near crack tip of a four - point - bend specimen when the ratio of m / q is close to 3. 0mm, criteria m / q, when the fracture mode of four - point - bend specimen transits from void - mode to shear - mode. intensely location plastic distortion is observed in the front of crack tip and the macro - fracture of the specimen with the same m / q belongs to shear - mode fracture

    本文主要在以下幾個方面取得了一定的進展：通過四點彎試件的斷口和切片試驗，觀察到裂紋尖端同時存在兩種斷裂機制? ?在兩種斷裂模式相互轉化的臨界狀態附近，裂紋前方既有鈍化和延伸區中的空穴形核擴張，又有銳化角前劇烈的集中剪切變形。
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