(河海大學(xué) 機(jī)電工程學(xué)院，常州 213022)
摘 要: 引入遺傳算法模擬正常晶粒長(zhǎng)大過(guò)程，基于正常晶粒長(zhǎng)大動(dòng)力學(xué)和能量最小原理，建立晶粒長(zhǎng)大的對(duì)應(yīng)遺傳規(guī)則和能量最小的適應(yīng)度函數(shù)。該算法模擬結(jié)果表明：系統(tǒng)的晶界總周長(zhǎng)和系統(tǒng)晶界能隨著遺傳代數(shù)的傳遞不斷減少，系統(tǒng)的熱力學(xué)狀態(tài)趨于穩(wěn)定；在5 000 GAS前后階段的晶粒長(zhǎng)大指數(shù)n分別為0.477和0.414，與理論值0.500相近，與正常晶粒長(zhǎng)大的動(dòng)力學(xué)規(guī)律較符合；晶粒半徑分布具有Weibull函數(shù)拓樸結(jié)構(gòu)形式，平均晶粒邊數(shù)為5.923。遺傳算法可以根據(jù)實(shí)際晶粒長(zhǎng)大過(guò)程的約束條件對(duì)遺傳規(guī)則和適應(yīng)度函數(shù)進(jìn)行設(shè)置，因而具有良好的柔性。
關(guān)鍵字: 遺傳算法；遺傳規(guī)則；適應(yīng)度函數(shù)；晶粒；模擬
（College of Mechanical and Electrical Engineering, Hohai University, Changzhou 213022, China）
Abstract:The genetic algorithm method was introduced in the simulation process of grain growth. Genetic rules and fitness functions were used in the simulation based on the kinetics and the lowest energy principle of normal grain growth. The simulation results indicate that the system boundary length and boundary energy reduce unceasingly along with the increase of GAS, system’s thermodynamics state tends to be stable. In the stage before and after the 5 000 GAS the grain growth exponent n is 0.477 and 0.414, respectively, close to the theoretical value 0.5, satisfying well to the kinetics of normal grain growth. The grain radius distribution agrees well with the Weibull function topology structural style, the average grain side is 5.923. In the genetic algorithm, the genetic rules and fitness functions may be established according to constraint condition in real grain growth process, so it has good flexibility.
Key words: genetic algorithm; genetic rule; fitness function; grain; simulation
