基于挠度图像辨识的木材弹性模量校正研究

Research on Wood Elastic Modulus Correction Based on Deflection Image Identification

针对木材弯曲试验中因万能力学试验机测定应变与试件挠度变化不同步而导致测得的弹性模量不精确的问题,提出一种基于挠度图像辨识的木材弹性模量校正方法。通过对试件进行三点弯曲加载试验,试验结果表明,利用图像处理修正前后,3组试件的弹性模量分别为8.22、8.35、8.93 GPa和11.24、11.47、14.60 GPa。说明万能力学试验机所测木材弹性模量相对保守,使用图像处理得到的载荷与挠度关系较原载荷-挠度曲线合理,该研究为静态弯曲载荷下的木材弹性模量的校正提供了借鉴。

To solve the problem that the measured value of wood elastic modulus is inaccurate due to the unsynchronized strain and the deflection measurement by universal mechanical testing machine in wood bending test,this paper proposes a correction method of wood elastic modulus based on the deflection image identification.The test results show that before and after image processing and correction,the elastic modulus of the three groups of specimens are respectively 8.22、8.35、8.93 GPa and 11.24、11.47、14.60 GPa.It shows that the wood elastic modulus measured by universal mechanical testing machine is conservative,and the relationship between load and deflection obtained by image processing is more reasonable than the original load-deflection curve.This study provides reference for revising the elastic modulus of wood under static bending load.