Characterizing crack growth in thin aluminum panels under tension-torsion loading using three-dimensional digital image correlation

被引:10
作者
Helm, JD [1 ]
Sutton, MA [1 ]
Boone, ML [1 ]
机构
[1] Correlated Solut Inc, Columbia, SC 29208 USA
来源
NONTRADITIONAL METHODS OF SENSING STRESS, STRAIN, AND DAMAGE IN MATERIALS AND STRUCTURES: SECOND VOLUME | 2001年 / 1323卷
关键词
mixed mode fracture experiments; tension-torsion loading; three-dimensional digital image correlation; non-contacting measurements; crack opening displacement;
D O I
10.1520/STP42138S
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The enclosed work was performed to determine whether a critical crack opening displacement (COD) criterion can be used to predict the stable crack growth behavior of thin, 2024-T3 aluminum fracture specimens experiencing tension and torsion loading. Due to the complexity of the large deformations that occur near the crack tip in a single edge-cracked specimen under torsion loading, a state of the art three-dimensional computer vision system was developed and employed to make the three-dimensional vector displacement measurements required to determine GOD. Results from the experimental program indicate that the three-dimensional surface profile and deformation measurement system was fully capable of making the required measurements, even in the presence of large, out-of-plane displacements and surface strains that occurred during the tension-torsion loading process. Specifically, the measurements show that (a) critical COD for tension-torsion loading is constant during crack growth, (b) COD is approximately 8% larger than observed for in-plane tension-shear and (c) the surface strain fields during crack growth are quite complex due to the coupling of out-of-plane displacements and in-plane surface strains.
引用
收藏
页码:3 / 14
页数:12
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