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assignmentutor-lab™ 为您的留学生涯保驾护航 在代写力学 mechanics方面已经树立了自己的口碑, 保证靠谱, 高质且原创的统计Statistics代写服务。我们的专家在代写力学 mechanics代写方面经验极为丰富，各种代写力学 mechanics相关的作业也就用不着说。

• Statistical Inference 统计推断
• Statistical Computing 统计计算
• (Generalized) Linear Models 广义线性模型
• Statistical Machine Learning 统计机器学习
• Longitudinal Data Analysis 纵向数据分析
• Foundations of Data Science 数据科学基础

## 英国补考|力学代写mechanics代考|Theory of Elasticity

Many engineering components, while in service, are subjected to a variety of loading. Examples include an airplane wing, which is subjected to lift and drag forces and formation rocks, which are subjected to pore pressure, in-situ stresses and the forces imposed by a drilling bit. In such situations it is necessary to know the characteristics of the engineering component’s materials such that any resulting deformation will not be excessive and failure will not occur. This is achieved by means of stress-strain relationships.

The theory of elasticity a methodology that creates a linear relation between the imposing force (stress) and resulting deformation (strain), for the majority of materials which behave fully or partially elastically. It plays an important role in the design of man-made components and structures as well as the assessment of the integrity of stable natural systems that have been disturbed by man.

The principles of the theory of elasticity and relevant stress-strain equations are discussed in this chapter, as prerequisites to studying failure criteria in Chapter $5 .$

## 英国补考|力学代写mechanics代考|MATERIALS BEHAVIOR

The degree to which a structure strains depends on the magnitude of an imposed load or stress. The element of stress is therefore very central in solids mechanics. However, stress cannot be measured directly. Usually strain (deformation) is measured in-situ or in the laboratory, and the stresses are then calculated.

For many materials that are stressed in tension or compression at very low levels, stress and strain are proportional to each other through a simple linear relationship as shown in part (a) of Figure 4.1.

However, the stress-strain (force-deformation) relation is not always simple and linear, and it can change with change of material properties and geometry. Stress-strain relations, known also as constitutive relations, are normally found empirically.

Consider a rod with initial length $l_{\sigma}$ in tension, as shown in Figure 4.2a. Having applied an axial load to the rod, it stretches to an additional length $\Delta l=l-l_{\mathrm{o}}$. It can be seen that the rod elongates in the axial direction but to minimize volume increase, it will become thinner in the middle section.

# 力学代考

## 有限元方法代写

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## MATLAB代写

MATLAB 是一种用于技术计算的高性能语言。它将计算、可视化和编程集成在一个易于使用的环境中，其中问题和解决方案以熟悉的数学符号表示。典型用途包括：数学和计算算法开发建模、仿真和原型制作数据分析、探索和可视化科学和工程图形应用程序开发，包括图形用户界面构建MATLAB 是一个交互式系统，其基本数据元素是一个不需要维度的数组。这使您可以解决许多技术计算问题，尤其是那些具有矩阵和向量公式的问题，而只需用 C 或 Fortran 等标量非交互式语言编写程序所需的时间的一小部分。MATLAB 名称代表矩阵实验室。MATLAB 最初的编写目的是提供对由 LINPACK 和 EISPACK 项目开发的矩阵软件的轻松访问，这两个项目共同代表了矩阵计算软件的最新技术。MATLAB 经过多年的发展，得到了许多用户的投入。在大学环境中，它是数学、工程和科学入门和高级课程的标准教学工具。在工业领域，MATLAB 是高效研究、开发和分析的首选工具。MATLAB 具有一系列称为工具箱的特定于应用程序的解决方案。对于大多数 MATLAB 用户来说非常重要，工具箱允许您学习应用专业技术。工具箱是 MATLAB 函数（M 文件）的综合集合，可扩展 MATLAB 环境以解决特定类别的问题。可用工具箱的领域包括信号处理、控制系统、神经网络、模糊逻辑、小波、仿真等。

assignmentutor™您的专属作业导师
assignmentutor™您的专属作业导师