Studying on the Propagation Behavior of Bent Crack Bending from Slant Pre-Crack with Compressive Residual Stress

You Li Ma

doi:10.4028/www.scientific.net/AMR.433-440.6558

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 433-440Studying on the Propagation Behavior of Bent Crack...

Studying on the Propagation Behavior of Bent Crack Bending from Slant Pre-Crack with Compressive Residual Stress

Abstract:

For a slant pre-crack under mixed-mode conditions, a method is proposed in which mode Ⅰ and mode Ⅱ stress intensity factors ‹K_I›_mes and ‹K_II›_mes can be directly evaluated from the discontinuous displacement along it. The effect on fatigue pre-crack deformation behavior was discussed by comparing fatigue and annealed cracks. In general, using the biggest tangential stress criterion the direction propagating from the pre-cracks can be predicted by ‹K_I›_mes and ‹K_II›_mes calculated above. So testing for bending fatigue crack propagation under mixed-mode conditions was carried out using fatigue and annealed slant pre-cracks with slant angle β=450 defined as the angle between loading and pre-crack direction in a rectangular plate. As a result, for annealed pre-crack, the estimated fracture angle θ_estcorresponded to the measured oneθ_mes ; On the other hand, for fatigue pre-crack,θ_mes is bigger than θ_est because of the compressive residual stress around the pre-crack .

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Periodical:

Advanced Materials Research (Volumes 433-440)

Pages:

6558-6564

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.433-440.6558

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Online since:

January 2012

Authors:

You Li Ma

Keywords:

Compressive Residual Stress, Discontinuous Displacement, Fatigue (Annealed) Pre-Crack Formatting, Fracture Angle, Mixed-Mode, Style, Styling

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