A novel method for measuring and characterizing dynamic fracture-initiation toughness of elastic-plastic materials |
| |
| Authors: | Gong Nengping and Xia Yuanming |
| |
| Institution: | (1) Department of Modern Mechanics, University of Science and Technology of China, 230027 Hefei, China;(2) Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Chinese Academy of Sciences China, China |
| |
| Abstract: | The characterization and testing methods of the dynamic fracture initiation toughness of elastic-plastic materials under tensile
impact are studied. By using the self-designed bar-bar tensile impact apparatus, a novel test method for studying dynamic
fracture-initiation has been proposed based on the one-dimensional test principle. The curve of average loadv. s. displacement
is smooth until unstable crack propagation, and the kinetic energy which does not contribute to the crack growth can be removed
from total work done by external-force to the specimen. The fracture-initiation point is determined by compliance-changing
rate method. The results show that these methods are feasible and effective. Through the analysis of the conversion between
work and energy of a fracture specimen, the dynamicJ-integral is adopted as a characteristic parameter for elastic-plastic materials under impact loading. TheJ-integral is calculated from
and
curves by using the formula proposed, by Rice. TheJ-integral at fracture initiation is employed to describe the dynamic fracture-initiation toughness of elastic-plastic materials
and the experimental results indicate thatJ
ID can be regarded as a material constant. |
| |
| Keywords: | elastic-plastic materials circumeferentially notched short cylinder tensile impact dynamic fracture toughnessJ ID |
| 本文献已被 SpringerLink 等数据库收录！ |
