fatigue crack propagation 中文意思是什麼

fatigue crack propagation 解釋
疲勞龜裂增長
  • fatigue : n 1 疲乏，勞累；勞苦；累活。2 【機械工程】（金屬屢經打擊等后的）疲勞。3 【醫學】（組織、器官等對...
  • 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...
  • propagation : 持續培養
  1. A new expression of fatigue crack propagation velocity

    一種帶可靠性的疲勞裂紋擴展速率表達式
  2. In this paper, the high - temperature low - cycle fatigue life and fatigue crack propagation life tests are carried on the cylindrical axial symmetry specimens having precrack or non - precrack with different types of notches of 16mnr steel in common use in the petrochemical industry contacting coke drum equipment, the stress / strain and the range of stress / strain of dangerous points are received through stress analysis of the specimens using finite element program under multi - axial stress state. at last, the equations of evaluating the high - temperature low - cycle fatigue life and the fatigue crack propagation life are found through using the least - square regression method

    本文採用無預裂紋和帶預裂紋環狀缺口圓柱形試樣，進行了石化焦炭塔設備常用材料16mnr多維應力狀態下不同缺口形式的高溫低周疲勞總壽命試驗及裂紋擴展壽命試驗，並利用有限元程序對試樣缺口周圍及裂紋尖端附近進行了軸對稱多維應力狀態下的應力、應變場分析，來評價材料不同條件下的高溫低周疲勞總壽命和裂紋擴展壽命，最後利用最小二乘回歸方法，得到了該材料高溫低周疲勞總壽命和裂紋擴展壽命評價方程。
  3. Abstract : the process of thermal fatigue crack propagation on the surface of steel bonded carbide gjw35 under the action of thermal stress has been observed

    文摘:觀察了在熱應力作用下gjw35鋼結硬質合金表面熱疲勞裂紋擴展過程。
  4. The results of quantitative analysis showed that the pre - tension deformation reduced the fatigue crack propagation threshold and increased the crack propagation coefficient, and consequently decreased the fatigue resistance of the part with mechanical damage

    定量分析表明：預拉伸變形降低了疲勞裂紋擴展門檻值，提高了裂紋擴展系數，從而使管線在機械損傷的部位疲勞抗力降低。
  5. Studies on the fatigue crack propagation rate ( fcpr ) indicate that load ratio ( r ) has a great effect on the fcpr : the greater load ratio is, the higher the fcpr becomes, and the lower kth shows. compared with load ratio, the thickness of the specimen has a lower effect on the fcpr

    對鎂合金的疲勞裂紋擴展特性的研究表明：載荷比r對鎂合金az91 ， am50裂紋擴展行為具有很大的影響。 r值越大，裂紋擴展速率越高，疲勞門檻值k _ （ th ）越小；試樣厚度t對鎂合金az91 、 am50穩態裂紋擴展速率的影響沒有r值那麼明顯。
  6. The fining grains of al - l % si could accelerate the fatigue crack propagation from the near threshold zone to paris zone

    隨著疲勞裂紋擴展速率從近門檻值區向paris區過渡，細小的a （ a1 ）晶粒會加速疲勞裂紋的擴展。
  7. Studying the rule of geometric shape of surface crack during propagation by means of fracture mechanics theory, a predicting method of fatigue crack propagation life and it ' s numerical calculation theory are presented

    本文應用斷裂力學理論，對焊接鋼結構表面裂紋擴展過程中裂紋幾何形狀的變化規律進行了探討，提出了疲勞裂紋擴展壽命的預測方法，給出了相應的數值計算理論。
  8. In spite of that, the cracks propagate stably in specimens for all types of tests. thus the paris formula can be used to describe the fatigue crack propagation, and the values of fatigue fracture parameters in the paris formula are regressed by using the results of fatigue damage and stress intensity factors computation

    盡管如此，不論對哪種疲勞試驗，其試件疲勞裂縫擴展主要表現為穩定擴展，可以運用paris公式描述疲勞裂紋擴展階段，並利用疲勞損傷數值模擬計算結果和裂縫擴展過程中的應力強度因子回歸了疲勞裂縫擴展速率公式中的疲勞斷裂參數。
  9. Fatigue crack propagation in partially high percentage fiber reinforced concrete

    局部高密度鋼纖維混凝土疲勞裂紋擴展實驗研究
  10. The microscopic plastic deformation of the local crazes cause the change of crack opening loads. therefore, the fatigue crack closure concept could be introduced. a crack closure model of mdyb - 3 pmma were recommended and phenomenologically formulated for positive and negative stress ratios separately, according to the testing results of fatigue crack propagation

    本文討論了有機玻璃疲勞裂紋擴展機理，提出，銀紋的形成是裂紋形成和擴展的基礎，從微觀上解釋了裂紋形成和擴展的原因，並結合金相分析結果，明確提出塑變誘導閉合和粗糙誘導閉合是有機玻璃疲勞裂紋面閉合的兩個主要原因，成功的解析了裂紋面的閉合現象。
  11. According to the observed results near the fracture surfaces, the orientations of the fatigue crack initiation and propagation were investigated to study the mechanism of multiaxial fatigue crack propagation

    根據薄壁管拉扭復合載試件斷口附近表面觀測結果，統計其裂紋擴展的位向，研究多軸疲勞裂紋萌生及擴展機理。
  12. Lefm plastics - determination of tension - tension fatigue crack propagation - linear elastic fracture mechanics approach

    塑料.測定拉伸-拉伸疲勞斷裂延伸性.線性彈力斷裂機械
  13. 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。
  14. During the course of the fatigue crack propagation, there lies crack - closing effect in both two alloys and the main crack - closing mechanic is plasticity - induced one

    裂紋擴展過程當中，兩種合金均存在著裂紋閉合效應；塑性誘發的裂紋閉合是鎂合金的主要裂紋閉合機制。
  15. In the present study, experimental investigations were carried out on the fatigue crack propagation characteristics of x60 pipeline steel after different degrees of pre - tension deformation ( 5 %, 10 %, 15 % )

    摘要用單邊裂紋試樣，研究了x60管線鋼經預拉伸變形量為5 % 、 10 %和15 %后的疲勞裂紋擴展特性。
  16. Two different reinforcing methodologies are applied : modification of the overlay characteristics by adding chopped glass fibers to the hot mixture asphalt ( hma ) and reinforcing asphalt overlay with glass grids. theory of fracture mechanics ( fm ) is employed to determine crack growth rates for the suggested anti - cracking overlay systems. asphalt mixture designing tests, three point bending tests and fatigue crack propagation tests were carried out. the critical stress intensity factors kic are determined for plain and reinforced asphalt concrete. depending on the fatigue crack propagation, the crack growth rate is determined for each type of anti - cracking system and the cracking process is also analyzed. one of the significant points in this study is the attempt to give better understanding of the crack propagation for multilayer asphaltic overlay or what are suggested herein to be called composite structure anti - cracking overlay system. the results indicate that the reinforcing materials improve anti - cracking characteristics of the asphalt concrete. composite structure anti - cracking overlay gives a good solution for the reflective cracking phenomenon over old cracked pavements

    利用2種不同的方法加筋瀝青罩面:在瀝青混合料中加入短切玻璃纖維改善瀝青混凝土的特性，採用玻璃格珊加筋瀝青混凝土.應用斷裂力學方法分析瀝青路面裂縫擴展機理.採用瀝青混合料設計試驗、三點彎曲試驗和疲勞裂縫擴展試驗，確定加筋瀝青混凝土的臨界應力強度因子kic ，測量每一種瀝青罩面抗裂系統的裂縫擴展速率.本研究的主要特點是提出復合型抗裂罩面系統，分析了多層加筋瀝青罩面裂縫擴展過程，推薦了若干瀝青路面抗裂系統.結果證明，加筋材料可以提高瀝青罩面的抗裂特性，復合型抗裂罩面系統能夠有效地阻止反射裂縫的擴展
  17. The fatigue crack propagation testing of mdyb - 3 pmma material under constant amplitude cyclic loading has been made. the effect of different stress ratios, room temperatures and loading frequencies were investigated in terms of the paris law presentations of the testing results

    本文研究了在恆幅正弦載荷下溫度、頻率和應力比對疲勞裂紋擴展的影響，給出溫度和頻率影響的定性分析，和應力比影響的定量分析，為建立疲勞裂紋擴展模型打下了基礎。
  18. The main purpose of this dissertation is to determine some of the fracture parameters of mdyb - 3 pmma and characterize its fatigue crack propagation behavior experimentally, and thereby, to offer basis to the residual life evaluation and the maintenance guideline of mdyb - 3 pmma canopy structures

    通過本文的斷裂參數和疲勞裂紋特性的試驗研究，並建立相應的分析模型，從而為評價有機玻璃的剩餘壽命，確立座艙蓋航空有機玻璃使用和維護準則提供基礎。
  19. Based on investigating a large amount of documents, the fatigue crack propagation behavior of mg alloys am50 & az91 is studied in this paper, as well as the tensile mechanical properties at elevated temperature. micro - mechanics of tensile deformation and the fcpr are also investigated by sem & tem

    本文在查閱大量相關文獻基礎上，對az91 、 am50鎂合金的疲勞裂紋擴展特性和高溫拉伸力學性能進行了一定的研究。藉助于掃描電鏡和透射電子顯微鏡，分析了拉伸變形和疲勞斷裂的微觀機制。
  20. The study on high - temperature low - cycle fatigue life and fatigue crack propagation life under multi - axial stress state shows that the fatigue life and fatigue crack propagation life can be characterized by the equivalent plastic strain range p, the equivalent creep strain range c and the equivalent strain range, and do n ' t exit notch dependency, non - notch - dependency equations being given in the paper

    ） _ c和當量應變范圍（ ? ）進行多維應力狀態高溫低周疲勞總壽命及裂紋擴展壽命評價是可行的，且不存在缺口依存性。並給出無缺口依存性的疲勞總壽命評價方程。
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