Crack initiation direction for a crack under mixed-mode loading

1995 ◽  
Vol 73 (2) ◽  
pp. R33-R37 ◽  
Author(s):  
J. H. Kuang ◽  
Y. C. Chen
Keyword(s):  
Crack Initiation ◽  
Mixed Mode ◽  
Mixed Mode Loading

On the crack path under mixed mode loading on PUR foams

2015 ◽  
Author(s):  
L. Marsavina ◽  
E. Linul ◽  
T. Voiconi ◽  
D. M. Constantinescu ◽  
D. A. Apostol
Keyword(s):  
Crack Initiation ◽  
Mixed Mode ◽  
Equivalent Stress ◽  
Solid Material ◽  
Maximum Tensile Stress ◽  
Maximum Energy ◽  
Mixed Mode Loading ◽  
Fracture Criteria ◽  
Density Maximum ◽  
Closed Cell

 In this paper are presented the crack initiation angles obtained in polyurethane (PUR) foams under mixed mode loading. Closed cell rigid PUR foams having three different densities 100, 145, and 300 kg/m3 were investigated. Experiments were performed using Asymmetric Semi-Circular Bend and Single Edge Crack specimens. The obtained crack initiation values were compared with four fracture criteria to introduce: Maximum Tensile Stress, Strain Energy Density, Maximum Energy Release Rate and Equivalent Stress Intensity Factor, and a good agreement was observed. This allow to conclude that the theoretical fracture criteria developed for solid material could be used with success to predict the crack propagation angles in cellular materials like PUR foams.

Crack Initiation in Functionally Graded Materials Under Mixed Mode Loading: Experiments and Simulations

2008 ◽  
Vol 75 (5) ◽  
Author(s):  
Alpay Oral ◽  
John Lambros ◽  
Gunay Anlas
Keyword(s):  
Crack Initiation ◽  
Tangential Stress ◽  
Functionally Graded Materials ◽  
Mixed Mode ◽  
Process Zone ◽  
Functionally Graded ◽  
Maximum Tangential Stress ◽  
Homogeneous Material ◽  
Mixed Mode Loading ◽  
Graded Materials

In this work, quasistatic crack initiation under mixed mode loading in planar (two-dimensional plane stress) functionally graded materials (FGMs) is studied. The goal of this work is to directly compare experiments and simulations so as to evaluate the applicability of the maximum tangential stress (MTS) criterion in predicting crack kinking in FGMs. Initially, crack initiation in the homogeneous material, which forms the basis of our FGM—polyethylene—is studied. The (generalized) maximum tangential stress is applied through the use of finite elements to determine crack initiation angles in the same graded configurations studied experimentally. Computational results of fracture parameters (stress intensity factors and T-stress), and crack initiation angles are compared to experimental results and good agreement is obtained. It is seen that the MTS criterion is applicable to FGM crack initiation prediction if the inherent material gradient length scale is larger than the fracture process zone.

Crack Initiation Angles in Functionally Graded Materials under Mixed Mode Loading

2008 ◽  
Author(s):  
Alpay Oral ◽  
Jorge L. Abanto-Bueno ◽  
John Lambros ◽  
Gunay Anlas ◽  
Glaucio H. Paulino ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Functionally Graded Materials ◽  
Mixed Mode ◽  
Functionally Graded ◽  
Mixed Mode Loading ◽  
Graded Materials
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