工程科学学报2017，Vol.39Issue(8)：1288-1294,7.DOI:10.13374/j.issn2095-9389.2017.08.020
混合型应力强度因子的光弹性多参数测定
Multiple parameter measurement of mixed-mode stress intensity factors using the photoelastic method
摘要
Abstract
Precise calculation of the stress intensity factors at crack tips is of great significance in accurate analysis of a structure' s crack initiation and fracture mode. In this research, a three-dimensional printing technique was adopted to manufacture a non-residu-al stress plate model, where high-precision printed pre-cracks avoid the occurrence of residual stress compared to traditional manufac-turing processes. By comprehensively considering the singular and non-singular stresses at the near-crack-tip region, three constant stresses controlled by the far field were adopted. Multiple parameters of the photoelastic method combined with the least-squares meth-od were applied to analyze the stress intensity factors of mode I and mixed modes in three-point bending tests under different loads, and a theoretical solution comparison was conducted. Results show that compared with the theoretical solution, the average calculation error for the mode Ⅰ stress intensity factor is 6. 1% and those for Ⅰ – Ⅱ mixed modes are 6. 4% and 5. 5% , respectively. This slight calcu-lation error verifies the reliability and accuracy of the multiple-parameter method and provides a reference for further precise calcula-tions of the stress intensity factors using the photoelastic method.关键词
光弹性法/3D打印/混合型应力强度因子/非奇异应力/最小二乘法Key words
photoelastic method/three-dimensional printing/mixed-mode stress intensity factor/non-singular stress/least-squares method分类
数理科学引用本文复制引用
赵熙,鞠杨,郑泽民..混合型应力强度因子的光弹性多参数测定[J].工程科学学报,2017,39(8):1288-1294,7.基金项目
国家自然科学基金资助项目(51374213) （51374213）
国家杰出青年科学基金资助项目(51125017) （51125017）
江苏省创新团队资助项目(2014-27) （2014-27）
