求帮忙外文翻译语句通顺就okThe strong thermal gradients present during laser heating, along with the fact that the twomaterials usually have different coefficients of thermal expansion, leads to the generation ofthermal stresses. Since the

求帮忙外文翻译语句通顺就okThe strong thermal gradients present during laser heating, along with the fact that the twomaterials usually have different coefficients of thermal expansion, leads to the generation ofthermal stresses. Since the
求帮忙外文翻译语句通顺就ok
The strong thermal gradients present during laser heating, along with the fact that the two
materials usually have different coefficients of thermal expansion, leads to the generation of
thermal stresses. Since the yield (flow) stress of the material decreases, in general, with
temperature, inelastic deformation will most likely take place. Thus, when the thermal loading is
removed, residual stresses remain in the material, concentrated mainly at the interface, which is
also the location where defects are more likely to be found (e.g., pores, cracks). A quantitative
understanding of these stresses, and how they depend on materials properties and (indirectly) on
the process parameters becomes very important.
Therefore, as several events are taking place, simultaneously, involving at least the fields of
Mass Transfer, Fluid Flow, Gas Dynamics, Phase Transformations, Deformation Mechanics and
Heat Transfer, it is important to develop mathematical models including these phenomena. In this
paper we will focus our attention in the latter two, as we will apply the Finite Element Method to
the determination of temperature and stress fields in a two-dimensional domain.
1.2 Modeling of laser cladding: previous efforts
Models of laser cladding developed so far have focused mainly on Heat Transfer, with a
few considering also Mass Transfer and Fluid Flow. Weerasinghe and Steen

求帮忙外文翻译语句通顺就okThe strong thermal gradients present during laser heating, along with the fact that the twomaterials usually have different coefficients of thermal expansion, leads to the generation ofthermal stresses. Since the
较强的热梯度出现在激光加热,随着这一事实,这两类学校
通常有不同的材料热膨胀系数的产生,导致
热应力.自从产量(流)的应力降低,一般情况下,材料
温度、无弹性变形就极有可能会发生.因此,当热载荷
移除,残余应力留在资料,集中主要界面,这是
缺陷的地点也更有可能被发现(如孔隙、裂缝).定量
了解这些应力,以及他们如何取决于材料的性质和(通过间接的方式)
工艺参数变得非常重要.
因此,正如几个事件正在发生,同时,涉及至少该领域的
传质、流体流动、气体动力学、物相转变、变形力学和
传热,这是很重要的,发展数学模型包括这些现象.在这个
本文将注重于后两者,如同我们将会运用有限元方法
测定温度场及应力场的二维域.
激光熔覆1.2建模:先前的努力
模型对激光熔覆技术发展至今的工作重点主要放在了传热、用
很少考虑也传质和流体流动.Steen Weerasinghe和