对于曲线移位系统的移位相关的连续性近似
A Jason Marx1,2, Stefan Sandfeld2, Thomas Hochrainer3
1Fachbereich Produktionstechnik, Fachgebiet 15, Universität Bremen, Bibliothekstraße 1, Bremen, 28359 Germany.
概括
这项研究分析了晶体可塑性的脱位自我相关性,揭示了它们在模拟中的主导地位. 了解这些相关性对于开发准确的连续性可塑性理论至关重要.
科学领域:
- 材料科学 材料科学 材料科学
- 凝聚物质物理学 凝聚物质物理学
- 固体力学 固体力学是什么
背景情况:
- 晶体的可塑性是由位移运动和相互作用所支配的.
- 连续性可塑性理论可以从失位的统计力学中出现.
- 长距离弹性相互作用需要考虑脱位相关性.
研究的目的:
- 导出分析表达式的失位自我相关性.
- 在失位配置中分析对相关性.
- 调查脱位半径分布及其与曲率的关系.
主要方法:
- 在循环位位循环配置中的自我相关性分析表达式的导出.
- 在二极管类失位配置中对相关性的分析.
- 将离散位移动态模拟与最大信息模型进行比较.
主要成果:
- 导出了各种失位配置中的自我相关性的分析表达式.
- 发现自我相关性在数值相关性数据中占主导地位.
- 来自模拟的脱位半径分布与包含曲率的模型相匹配.
结论:
- 自相关性对于理解晶体可塑性至关重要,需要仔细的理论处理.
- 对于连续位移动态中物理意义上的半径分布,需要一个与曲率相关的变量.
相关概念视频
Calibration Curves: Correlation Coefficient
4.9K
In a linear calibration curve, there is a value called the calibration coefficient, denoted by 'r,' which measures the strength and the direction of association between two variables. The correlation coefficient value ranges from −1 to +1. A value of +1 indicates a perfect positive linear correlation, −1 denotes a perfect negative correlation, and 0 implies no correlation between the two variables. A positive correlation value establishes that as one variable increases, the...
4.9K
Approximate Integration
53
In many practical and theoretical contexts, the exact value of a definite integral may be inaccessible. This limitation typically arises when the antiderivative of a function is either unknown or cannot be expressed in a closed mathematical form. Alternatively, it can occur when a function is defined not by a formula but by a finite set of empirical data points, such as those collected during experiments. In these cases, approximate integration techniques provide a valuable solution.One of the...
53
Linearization and Approximation
63
Linearization is a mathematical technique used to approximate complex, nonlinear functions with simpler linear models in the vicinity of a chosen reference point. The method is based on the idea that, although a function may be difficult to evaluate exactly, its behavior near a specific input value can often be closely approximated by the tangent line at that point. This approach is particularly useful when small deviations from a known value are involved.Consider the square root function, for...
63
Correlations
36.1K
Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
36.1K
Correlation and Causation
42.8K
Statistical tests can calculate whether there is a relationship, or correlation, between independent and dependent variables. An indirect relationship of the variables signifies a correlation, while a direct relationship shows causation. If it is determined that no connection exists between the variables, then the correlation is a coincidence.
Correlation versus Causation
If the dependent variable increases or decreases when the independent variable increases, there is a positive or negative...
Correlation versus Causation
If the dependent variable increases or decreases when the independent variable increases, there is a positive or negative...
42.8K
Accuracy, limits, and approximation
1.3K
Accuracy, limits, and approximations are common in many fields, especially in engineering calculations. These concepts are imperative for ensuring that a given value is as close as possible to its true value.
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
Accuracy is defined as the closeness of the measured value to the true or actual value. In engineering mechanics, repeated measurements are taken during theoretical or experimental analyses to ensure that the result is precise and accurate.
The accuracy of any solution is based on the...
1.3K


