激光全息军用关键部件三维变形及应力测试

三维形变和三维应力测量一直是结构工程领域的重要研究课题。本文基于数字全息原理,设计了数字全息记录测试装置,实现了三维物体变形的测量;基于四个干涉图法和Matlab软件编程,提出并实现了数字相移,省去了压电位移器、位相控制器等硬件,简化了装置;基于数字全息测得的变形量与有限元理论,利用Ansys软件编程,获得变形物体的三维应力的大小及分布,从而实现了数字全息三维应力测试。大量实验表明,此方法实验装置简单、测量精度高,变形测量可容易达到1/10波长,应力测量精度可达到1.535×10^5Pa。

Three-dimensional Deformation and Stress Test of Military Key Elements Based on Laser Holography

The measurement of three dimensional deformation and three-dimensional stress test are always an important research topic in the field of structure engineering. In this paper,based on the digital holographic principle,the measurement setup of digital holographic recording was designed,the three-dimensional deformation of an object was tested. Based on four-interferogram method and Matlab software programming,digital phase shift was proposed and realized,so the piezoelectric translator,phase controller and other hardware were deleted,the experimental layout was simplified.Based on the deformation measured by digital holography and finite element theory,and using Ansys software programming,the three-dimensional stress and distribution of a deformed object were obtained,so the digital holographic three-dimensional stress test is achieved.A lot of experiment results shown that this method is a simple experimental setup and have high measure accuracy. The deformation test precision can be up to 1/10 wavelength,stress-measurement accuracy can be up to 1.535×105Pa.