%0 Journal Article
%T CONTROL OF RESIDUAL STRESS FOR LASER AIDED DIRECT METAL DEPOSITION BASED ON DIMENSIONAL ANALYSIS<br>基于量纲分析的激光直接成形残余应力控制
%A 章凌
%A 宋宏伟
%A 虞钢
%J 力学与实践
%D 2009
%I 
%X In the process of laser aided direct metal deposition (DMD), the control of thermal-induced residual stress is very difficult, because the stress is affected by many parameters including geometrical dimensions, material properties and process parameters. In this paper, dimensional analysis is employed to extract key dimensionless parameters of geometry, heat transfer and thermal deformation. In addition, a 3D transient FEA model is proposed to study the effects of these key dimensionless parameters on the residual stress. It is shown that the residual stress can be controlled by employing materials with relatively small thermal expansion coefficient or small yield stress. Furthermore, the residual stress can be reduced by decreasing heat loss, increasing laser power, especially, by increasing preheat temperature.
%K Direct metal deposition
%K residual stress
%K dimensional analysis
%K process optimization<br>激光直接成形
%K 残余应力
%K 量纲分析
%K 工艺优化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=5D344E2AD54D14F8&jid=0BF5C9FB031A532ED0A6D99DC4F6181A&aid=E09660E6818C117977BCFB94A1716388&yid=DE12191FBD62783C&vid=4AD960B5AD2D111A&iid=E158A972A605785F&sid=42425781F0B1C26E&eid=1371F55DA51B6E64&journal_id=1000-0879&journal_name=力学与实践&referenced_num=0&reference_num=4