The effect of boundary conditions on computer simulating dislocation patterns of a fatigued copper single crystals was studied by using the method of discrete dislocation dynamics in two-dimensional system.

利用二維離散位錯動力學(xué)方法,研究了邊界條件對計算機(jī)模擬疲勞Cu單晶位錯花樣的影響,結(jié)果表明:邊界條件在模擬位錯花樣這類多體問題時是非常重要的;在其它模擬機(jī)制均完全相同的情況下,不同邊界條件會形成不同的模擬結(jié)果,自由空間邊界條件是最簡單、也是最不現(xiàn)實的邊界條件,模擬結(jié)果與實驗結(jié)果相差甚遠(yuǎn);而一維最近鄰周期性邊界條件與二維近鄰周期性邊界條件的模擬結(jié)果基本相同,與Cu單晶早期疲勞位錯花樣的實驗比較吻合。

During cyclic deformation, the dislocation pattern formed at the early stages and its evolution were simulated by using the method of discrete dislocation dynamics and observed with the electron channeling contract (ECC) technique in scanning electron microscopy (SEM) on a single-slip- oriented copper single crystals.

采用離散的位錯動力學(xué)方法，用計算機(jī)模擬循環(huán)形變單滑移取向Ｃｕ單晶中疲勞早期位錯花樣的形成和演化過程，并利用掃描電鏡電子通道襯度（ＳＥＭ—ＥＣＣ）技術(shù)對其進(jìn)行了觀察。