Crack equivalent concept applied to the fracture characterization of bonded joints under pure mode I loading

2008 ◽  
Vol 68 (10-11) ◽  
pp. 2224-2230 ◽  
Author(s):  
M DEMOURA ◽  
R CAMPILHO ◽  
J GONCALVES
Keyword(s):  
Mode I ◽  
Pure Mode ◽  
Bonded Joints ◽  
Fracture Characterization ◽  
Mode I Loading

scholarly journals Mode I fracture characterization of human bone using the DCB test

2015 ◽  
Vol 6 (3) ◽  
pp. 355-366
Author(s):  
F.G.A. Silva ◽  
M.F.S.F. de Moura ◽  
N Dourado ◽  
F. A. M. Pereira ◽  
J.J.L. Morais ◽  
...  
Keyword(s):  
Fracture Energy ◽  
Cortical Bone ◽  
Bone Fracture ◽  
Mode I ◽  
Pure Mode ◽  
Fracture Characterization ◽  
Content Type ◽  
Human Cortical Bone ◽  
Mode I Loading

Purpose – Fracture characterization of human cortical bone under pure mode I loading was performed in this work. The purpose of this paper is to validate the proposed test and procedure concerning fracture characterization of human cortical bone under pure mode I loading. Design/methodology/approach – A miniaturized version of the double cantilever beam (DCB) test was used for the experimental tests. A data reduction scheme based on crack equivalent concept and Timoshenko beam theory is proposed to overcome difficulties inherent to crack length monitoring during the test. The application of the method propitiates an easy determination of the Resistance-curves (R-curves) that allow to define the fracture energy under mode I loading from the plateau region. The average value of fracture energy was subsequently used in a numerical analysis with element method involving cohesive zone modelling. Findings – The excellent agreement obtained reveals that the proposed test and associated methodology is quite effective concerning fracture characterization of human cortical bone under pure mode I loading. Originality/value – A miniaturized version of traditional DCB test was proposed for cortical human bone fracture characterization under mode I loading owing to size restrictions imposed by human femur. In fact, DCB specimen propitiates a longer length for self-similar crack propagation without undertaking spurious effects. As a consequence, a R-curve was obtained allowing an adequate characterization of cortical bone fracture under mode I loading.

Mixed-mode (I+II) fracture characterization of wood bonded joints

2011 ◽  
Vol 25 (4) ◽  
pp. 1956-1962 ◽  
Author(s):  
M.F.S.F. de Moura ◽  
J.M.Q. Oliveira ◽  
J.J.L. Morais ◽  
N. Dourado
Keyword(s):  
Mixed Mode ◽  
Mode I ◽  
Bonded Joints ◽  
Fracture Characterization

Interlaminar and intralaminar fracture characterization of composites under mode I loading

2010 ◽  
Vol 92 (1) ◽  
pp. 144-149 ◽  
Author(s):  
M.F.S.F. de Moura ◽  
R.D.S.G. Campilho ◽  
A.M. Amaro ◽  
P.N.B. Reis
Keyword(s):  
Mode I ◽  
Fracture Characterization ◽  
Mode I Loading

Fracture characterization of sandwich structures interfaces under mode I loading

2010 ◽  
Vol 70 (9) ◽  
pp. 1386-1394 ◽  
Author(s):  
D.A. Ramantani ◽  
M.F.S.F. de Moura ◽  
R.D.S.G. Campilho ◽  
A.T. Marques
Keyword(s):  
Sandwich Structures ◽  
Mode I ◽  
Fracture Characterization ◽  
Mode I Loading

Fatigue-fracture characterization of wood under mode I loading

2019 ◽  
Vol 121 ◽  
pp. 265-271 ◽  
Author(s):  
N. Dourado ◽  
M.F.S.F. de Moura ◽  
A. de Jesus
Keyword(s):  
Fatigue Fracture ◽  
Mode I ◽  
Fracture Characterization ◽  
Mode I Loading

scholarly journals Experimental and Numerical Failure Analysis of Adhesive Composite Joints

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Farhad Asgari Mehrabadi
Keyword(s):  
Adhesive Bonding ◽  
Strain Energy Release ◽  
Lap Joints ◽  
Mode I ◽  
Pure Mode ◽  
Bonded Joints ◽  
Lap Joint ◽  
Stress Concentrations ◽  
Adhesively Bonded ◽  
Mode I Loading

In the first section of this work, a suitable data reduction scheme is developed to measure the adhesive joints strain energy release rate under pure mode-I loading, and in the second section, three types of adhesive hybrid lap-joints, that is, Aluminum-GFRP (Glass Fiber Reinforced Plastic), GFRP-GFRP, and Steel-GFRP were employed in the determination of adhesive hybrid joints strengths and failures that occur at these assemblies under tension loading. To achieve the aims, Double Cantilever Beam (DCB) was used to evaluate the fracture state under the mode-I loading (opening mode) and also hybrid lap-joint was employed to investigate the failure load and strength of bonded joints. The finite-element study was carried out to understand the stress intensity factors in DCB test to account fracture toughness using J-integral method as a useful tool for predicting crack failures. In the case of hybrid lap-joint tests, a numerical modeling was also performed to determine the adhesive stress distribution and stress concentrations in the side of lap-joint. Results are discussed in terms of their relationship with adhesively bonded joints and thus can be used to develop appropriate approaches aimed at using adhesive bonding and extending the lives of adhesively bonded repairs for aerospace structures.

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