CN112765780B - 一种压力作用下非晶体自由体积浓度最大值的计算方法 - Google Patents
一种压力作用下非晶体自由体积浓度最大值的计算方法 Download PDFInfo
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Abstract
本发明属于航空航天非晶材料力学行为的分析方法,提出了一种压力作用下非晶体自由体积浓度最大值的计算方法,准确预测结构部件在压力作用下的力学响应。技术方案包括:利用Maxwell模型,结合固态相变动力学里面的速率方程,在平均场框架下得到应力应变曲线。得出的理论结果可以指导工程当中的试验以及做出准确预测,避免结构部件使用中产生意料之外的屈服和断裂。
Description
技术领域
本发明属于航空航天非晶材料力学行为的分析方法,涉及弹塑性力学行为。
背景技术
非晶体是过热液体经过快速冷却达到玻璃温度转变点而形成的,其具有优异的力学性能,比如高强度、高硬度、大的弹性极限和良好的延展性。非晶体在压力的作用下,其弹塑性变形具有很强的非线性。对于晶体,以位错为出发点,可以来研究非弹性变形。然而对于非晶体,内部结构是长程无序和不均匀的,没有可以明显表征内部缺陷的量,因此阻碍了玻璃态材料的理论研究。为了理解和解释非晶体的非线性力学行为,一些模型被提出,其中应用比较广泛的有自由体积涨落模型、剪切转变区模型、软玻璃流变模型。这些模型形式比较复杂,在工程中应用不多,而且这些模型缺乏压力作用下非晶体自由体积浓度计算方法的研究,无法准确预测结构部件在压力作用下的力学响应,结构部件使用中会产生意料之外的屈服和断裂。
发明内容
本发明的目的是:
提出了一种压力作用下非晶体自由体积浓度最大值的计算方法,准确预测结构部件在压力作用下的力学响应。
本发明的技术方案是:
一种压力作用下非晶体自由体积浓度最大值的计算方法,
利用Maxwell模型,结合固态相变动力学里面的速率方程,在平均场框架下得到应力应变曲线。
所述的方法包括以下步骤:
步骤二、对自由体积浓度cf进行归一化处理;
步骤三、写出Maxwell模型中非晶体应力σ随时间t的演化方程;
步骤四、将流度f和自由体积浓度cf的关系式代入上一步的演化方程中;
步骤五、写出固态相变动力学中的速率方程;
步骤六、联合以上步骤中的方程,进行数值求解。
其中a、b、m、n、B、T0均为参数。
所述的步骤二具体为:对自由体积浓度cf进行归一化处理
c0表示cf的初始值,无量纲参数C,称为约化自由体积分数。
所述的步骤三具体为:写出Maxwell模型中非晶体应力σ随时间t的演化方程
其中f表示流度,定义为f=E/η,E和η分别表示弹性模量和粘度。
α为参数。
所述的步骤五具体为:写出固态相变动力学中的速率方程
k0和λ是参数,Ea是激活能,kB是玻尔兹曼常数。
本发明的优点是:
给出了压力作用下非晶体自由体积浓度最大值的计算公式,可应用于Maxwell模型中,得出的理论结果可以指导工程当中的试验以及做出准确预测,避免结构部件使用中产生意料之外的屈服和断裂。
具体实施方式
其中a、b、m、n、B、T0均为参数。
对cf进行归一化,得到一个新的无量纲参数C,称为约化自由体积分数。
c0表示cf的初始值。
在Maxwell模型中,应力σ随时间t的演化方程如下所示:
其中f表示流度,定义为f=E/η,E和η分别表示弹性模量和粘度。
由统计方法可知:
f=αcf (4)
α为参数。
将(4)式代入(3)式可以得到:
根据固态相变动力学理论中的Prout-Tompkins速率方程,有
其中k为速率因子,表达式为:
k0和λ是参数,Ea是激活能,kB是玻尔兹曼常数。
将(7)式代入(6)式可以得到:
表1 Maxwell模型中的参数
参数 | 数值 | 参数 | 数值 |
E | 15GPa | k<sub>0</sub> | 10<sup>13</sup>s<sup>-1</sup> |
α | 10<sup>11</sup>s<sup>-1</sup> | E<sub>a</sub> | 1.25eV |
c<sub>0</sub> | 10<sup>-15</sup> | m | 60K/GPa |
a | 1.25*10<sup>-17</sup> | n | 10K/GPa |
b | 5.0*10<sup>-10</sup>s | λ | 150J/GPa |
B | 2000K |
Claims (6)
1.一种压力作用下非晶体自由体积浓度最大值的计算方法,其特征在于,
利用Maxwell模型,结合固态相变动力学里面的速率方程,在平均场框架下得到应力应变曲线,
所述的方法包括以下步骤:
步骤二、对自由体积浓度cf进行归一化处理;
步骤三、写出Maxwell模型中非晶体应力σ随时间t的演化方程;
步骤四、将流度f和自由体积浓度cf的关系式代入上一步的演化方程中;
步骤五、写出固态相变动力学中的速率方程;
步骤六、联合以上步骤中的方程,进行数值求解,
其中a、b、m、n、B、T0均为参数。
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JP2014077700A (ja) * | 2012-10-10 | 2014-05-01 | Mazda Motor Corp | 力学的物理量の算出方法及び装置 |
WO2017178860A1 (en) * | 2016-04-15 | 2017-10-19 | Total Sa | A method for determining a plasticity parameter of a hydrating cement paste |
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JP2014077700A (ja) * | 2012-10-10 | 2014-05-01 | Mazda Motor Corp | 力学的物理量の算出方法及び装置 |
WO2017178860A1 (en) * | 2016-04-15 | 2017-10-19 | Total Sa | A method for determining a plasticity parameter of a hydrating cement paste |
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基于不可逆热力学的Ni-Ti合金动态本构模型及其有限元实现;李云飞等;《材料导报》;20190520(第10期);全文 * |
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