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首页> 外文学位 >Mechanics guided design of hybrid laser/waterjet system for machining hard and brittle materials.
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Mechanics guided design of hybrid laser/waterjet system for machining hard and brittle materials.

机译：机械加工指导的混合激光/水刀系统，用于加工坚硬和脆性材料。

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摘要

The two main objectives of this work is (1) to develop a mathematical model to efficiently capture the fracture behavior of materials undergoing thermal shock and (2) to design and develop a mechanics based hybrid laser/waterjet manufacturing process that will be able to machine hard and brittle materials at higher speeds and with better cut quality. The mathematical model relates the temperature generated during the machining process to the fracture behavior observed during machining. The hybrid manufacturing processes produces a synergetic effect of both laser and waterjet processes and overcomes the disadvantages of both of them.;The temperature distribution is obtained from the Green's solution of the Fourier Heat Conduction equation. Uncoupled thermoelastic stresses are obtained from the temperature distribution which in-turn is related to the stress intensity factor/Griffith Energy for Mode I crack growth by Bueckner's weight function approach. This model can also be used to predict fracture behavior for given laser processing conditions. This model can also be used to manipulate transformational stresses that occur during machining of high conductive materials. This model can be easily extended to many multi-physics problems involving thermo-elastic behavior.
机译：这项工作的两个主要目标是（1）建立数学模型以有效捕获遭受热冲击的材料的断裂行为；（2）设计和开发基于机械的混合激光/水刀制造工艺，该工艺能够进行机械加工硬而脆的材料，速度更高，切割质量更好。数学模型将在加工过程中产生的温度与在加工过程中观察到的断裂行为联系起来。混合制造过程产生了激光和喷水过程的协同效应，并克服了两者的缺点。温度分布是从傅立叶热传导方程的格林解获得的。从温度分布中获得非耦合的热弹性应力，而温度分布又通过Bueckner的权函数方法与模式I裂纹扩展的应力强度因子/格里菲斯能量相关。该模型还可用于预测给定激光加工条件下的断裂行为。该模型还可以用于处理在加工高导电材料期间发生的相变应力。该模型可以轻松扩展到涉及热弹性行为的许多多物理场问题。

著录项

  • 作者

    Kalyanasundaram, Dinesh.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Mechanical.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 180 p.
  • 总页数 180
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;
  • 关键词

  • 入库时间 2022-08-17 11:38:24

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