instability stress 中文意思是什麼

instability stress 解釋
不穩定應力
  • instability : n. 動搖性，不穩定性；不堅決，反復無常，三心二意。 the instability of human affairs 人事滄桑。
  • stress : n 1 壓力，壓迫，緊迫，緊張。2 【語音】重音；重讀；【詩】揚音；語勢，著重點。3 重要（性），重點，...
  1. This thesis briefly analyzes some yield criteria and instability criteria to the sheet metal forming first. then according to the transformation rule from ultimate strain to ultimate stress, it establishes the mathematical calculation models of the forming limit stress diagram for the software development according to hill48 、 hill79 and hosford yield criterion irrespectively

    本文首先分析了板料成形的屈服準則和失穩準則，然後根據極限應變到極限應力的轉換關系，分別採用hill48屈服準則、 hill79屈服準則和hosford屈服準則，建立了用於軟體開發的成形極限應力圖的數學計算模型。
  2. The numerical example shows that if we use the correct guess integral, this method will give right answer. it has good performance for both p - version and hybrid stress fem. last, a hybrid stress finite element with second stress completion is presented, which keeps the virtue of normal hybrid finite element, especially good for incompressble material, because it can avoid the self lock of displacement and instability of stress results

    第一部分還首次提出了一個滿足二次應力完備的雜交應力單元，它的應力滿足二次應力完備，而且通過巧妙的應力插值函數，避免了一般雜交應力元的矩陣求逆過程，而通常這個求逆過程都是很耗時的，這個二次應力完備雜交元保持了一般雜交元的優點，對于不可壓縮問題具有較好的性能。
  3. Internal waves are a kind of bridge relating the diapycnal mechanical mixing to external sources of mechanical energy : first, internal waves are driven by wind stress and barotropic tide so that large amount of mechanical energy are transported to abyssal ocean with propagation of internal waves ; second, the mechanical energy can directly be cascaded to mixing through instability and breaking of internal waves

    內波是外界提供的機械能與混合之間聯系的橋梁之一，一方面風和潮汐通過激發內波，將能量向深海和大洋內區傳遞，另一方面，內波的不穩定和破碎直接將機械能串級到小尺度湍流混合中去。開展傾斜地形上內波的傳播以及內潮的產生等方面的研究對海洋混合過程的參數化以及混合對大洋環流的影響等方面的研究具有重要的科學意義。
  4. Using logging information can make the size and direction of in - situ stress, and then determine fracture pressure and breakout pressure so can provide the suitable mud density to solve the mechanics instability of borehole

    用測井資料可以確定地應力的大小和方向，從而確定地層破裂壓力和坍塌壓力，並給出合理的泥漿密度，解決井眼力學失穩問題。
  5. First read in the calculation result file i. e. d3plot, then input the correlative material parameters and ultimate strain from experiments, and the developed software will produce the forming limit stress diagram used as sheet metal instability criterion and the stress contour of the part

    所開發的應用軟體，首先讀取dynaform的計算結果文件d3plot ，輸入材料的相關參數和試驗所得到的板料的極限應變，軟體即可生成用作板料失穩判據分析用的成形極限應力圖和零件的應力雲圖。
  6. According to the former mathematical calculation models, the applied software, which uses the forming limit stress diagram as its instability criterion, is developed based on the sheet metal forming finite element code dynaform using visual c + +

    根據以上所建立的數學計算模型，基於板成形專用有限元分析軟體dynaform的環境，用visualc + +開發了以成形極限應力圖作為判據的應用軟體。
  7. In view of the above reason, this thesis adopts the forming limit stress diagram as the instability criterion due to its independence of strain paths, which is acknowledged at home and abroad in the field of sheet metal forming, and develops the applied software for the special purpose finite element analysis code dynaform in order to provide it with a new instability criterion

    本文基於板成形專用有限元分析軟體dynaform ，以國內外板料成形領域認同的具有應變路徑獨立性優點的成形極限應力圖為判據進行了應用軟體的二次開發，以期為板成形有限元分析軟體提供一個新的失穩判據。
  8. Symptoms that an organization is not effectively practicing risk management include a continual state of project instability, constant fire - fighting, multiple schedule slippages because of recurring surprise factors, and constantly operating in a high - stress, crisis management role

    一個組織沒有有效地實踐管理風險的癥狀包括：不斷陳述計劃的不穩定，不斷的救火，因為重現意外因素而成倍時間延誤不斷的運行在高壓下，管理角色危急。
  9. At first it analyzes the bedding rock slope ' s bedded rock and its incontinuity face, and studies the stress, strain, stability ' s condition of the bedding rock slope, fully considering the cohesive force of rock layer and incontinuity face. geologic mechanics models of two types of bedding rock slope are set up, the instability coefficient of bedding rock slope under different mechanical parameters is computed, and the conclusion that the stability of bedding rock slope is relation to rock layerer, cohesive force of incontinuity face, inner friction angle and rock layer obliquity has been gotten. based on the above discussion, the thesis comes down the influence of rock layer and the incontinuity face on the bedding rock slope to incontinuity face ' s influence factors, and discusses other factors that influence the bedding rock slope ' s stability, so gains the evaluating and forecasting index marks

    本文首先對順層邊坡的層狀巖體及其中的層理面和不連續面進行了分析，對其應力應變進行了研究，得出了順層邊坡的穩定性不僅與巖體中巖石的強度有關，還與巖體中層理面及不連續面的內聚力、內摩擦角及其傾角有關；論文建立了層理面和節理面的地質力學模型，討論了其力學參數變化對邊坡穩定性的影響，並在此基礎上將層理面和節理面歸納為順層邊坡穩定性的結構面影響因素，同時討論了影響順層邊坡穩定性的其他因素，從而得出順層邊坡穩定性的評價預測指標。
  10. The high incidence of financial instability and crisis, from the late 1990s to the present time, has spurred the development of analytical methods for the assessment of the robustness of the financial sector, its exposure to risk and its vulnerability to shocks. quantitative tools include indicators of financial sector soundness, early warning systems, sensitivity analysis and extreme scenarios ( “ stress tests ” ), and financial forecasting

    20世紀80 、 90年代以來，由於金融危機在各國的頻繁發生，特別是亞洲金融危機的爆發，金融危機更易傳染，也更具有危害性，這些都使得國際上對于各類金融部門的穩定性的數量評估方法研究迅速增加，這些數量的方法包括:金融穩健指標，早期預警系統，敏感性分析和壓力測試。
  11. Based on the catastrophic characters of the whole strain energy in truss structural instability, the relationship between the whole strain energy and the stress rate in the link element was educed, and the stress rate criterion for judging the instability of truss structures was built up through analyzing the changing law of stress rate

    基於桿系結構發生動力失穩時的總應變能突變特徵，推導總應變能同桿單元應力變化率之間的關系，並分析應力變化率的變化規律，建立了判定系結構動力失穩的應力變化率準則。
  12. The results show that the stress rate criterion applies for the judgment of the truss structural instability, and the criterion is more effective and definite in the local instability

    結果表明，應力變化率準則可以有效判定桿系結構的動力失穩，並且在判定結構的局部失穩方面非常有效和明確。
  13. Considering the judgment of dynamic instability of truss structures, a stress rate method for dynamic instability analysis of truss structures was proposed

    摘要針對結構動力失穩的判定問題，提出了一種適用於桿系結構動力穩定分析的應力變化率法。
  14. Through static and dynamic numerical analyses of geometrically symmetric and asymmetric 3pbs, the conclusion is drawn : asymmetrical dynamic stress - strain field causes the crack expanding instability of geometrically asymmetric sample but not static condition

    ?通過以上幾何對稱及非對稱3pbs模型的靜態、動態數值分析，得出結論：幾何非對稱試件裂紋後期擴展的不穩定性是由非對稱的動態應力應變場引起，與靜態條件無關。
  15. The goal of analyzing the instability in complex sheet metal forming is reached using the forming limit stress diagram as criterion in this thesis. some different sheet metal forming parts are analyzed with the developed software, whose results show that the developed software is satisfying for technological analysis of sheet metal forming and the applied module attains the anticipated goal

    並用所開發的應用軟體成功地對板成形零件的有限元計算結果進行了分析，分析結果表明，用該軟體分析板成形零件的失穩情況的結果可以滿足板成形工藝分析要求，所開發的應用軟體模塊達到了預期目的。
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