scale nucleation 中文意思是什麼
scale nucleation
解釋
垢的成核- scale : n 1 （尺、秤等上刻劃的）分度，度數，標，標度，刻度；尺寸；尺，尺度。2 【音樂】（標度）音階；音列...
- nucleation : n. 【物、化】成核（現象）；晶核過程，核子作用；集結；人工降雨作用。
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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。 -
Accordingly, a new framework, which provides a common scheme for the numerical simulation on the macroscopic behavior of ferroelectrics though multi - scale analysis on the coupled thermo - electrics - mechanical behavior of multiphase in heterogeneous material, is induced to construct the effective constitutive equation of multiphase. in chapter four, based on the law of domain nucleation and domain wall motion of 1800 domain switching, a new scheme of domain switching and numerical simulation approach is put forward on the foundation of thermodynamics. driving traction, nucleation criterion, velocity of domain wall motion, kinetic relation and rate of domain switching in a single grain are given
第四章以鐵電體1800疇變的過程中形核規律和疇界運動規律的實驗觀察結果為基礎，根據熱力學理論建立鐵電體疇變的理論框架和數值模擬方法；給出了單疇內疇變驅動力、新疇形核準則、疇界運動速度公式、疇變動力學的表達式，單晶的疇變速率公式；用細觀力學的觀點給出了對多晶鐵電體多場耦合的有效性質進行包含疇變速率影響的多尺度分析方法。 -
The results show that in the later stage of the nucleation process, the maximum slip velocity is monotonically accelerating ; the slipping hot spot ( where the slip rate is maximum ) migrates spontaneously from a certain instant, and such migration is spatially continuous ; when the maximum velocity reaches a detectable order of magnitude ( at least one order of magnitude greater than the loading rate ), the remaining time is 20 hours or more, and the temporal variation of slip velocity beyond this point may be used as a precursory indicator ; the average slip velocity is related to the remaining time by a log - log linear relation, which means that a similar relation between rate of microseismicity and remaining time may also exist ; when normal stress variation is taken into account, time scale of such processes can be extended by about 2 times
結果表明，在成核的後期階段：最大位移速率單調加速增加；滑動熱點（最大滑動速率處）在後期階段開始自發性遷移，且在空間上連續；當最大滑動速率達到可以明顯探測的量級時（高於載入速率一個數量級以上） ，倒計時間為20小時或更長一些，這時的速率變化可作為臨震預測標志；平均滑動速率與倒計時間的關系在臨震階段呈對數線性趨勢，由此可推測微震活動增長率與倒計時間同樣存在對數線性關系；正應力的變化對上述時間尺度有延長作用，使之大致增加到原數值的2倍。
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