PSI - Issue 37

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 37 (2022) 477–484 Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract The paper presents the experimental results of the crack process induced by viscoelastic effect and mechanical loadings. The notched specimens are White fir and Okume with dimensions equal to 160x12x60mm and notch length of 20mm. These specimens were tested in 3-point bending for 5 days under an initial stress of 80% of the rupture stress. At the end of these 5 days, we applied a second stress corresponding to 100% of the rupture stress. These tests were carried out under a sorption cycle of 45-75% relative humidity and at a constant temperature of 20°C. Monitoring of the crack propagation was performed by using an USB microscope. The results show that the crack propagation is accentuated by the drying effects on the one hand and by the effects of the applied stress on the other hand. The results show that crack propagation is influenced by viscoelastic effects, and by mechano-sorptive effects as shown in Figure 1. The crack propagation is more important when mechano-sorptive effects occur, especially during the drying. Keywords: Energy release rate;Crack propagation; Mechano-sorptive creep;Viscoelastic creep; Abstract The paper presents the experimental results of the crack process induced by viscoelastic effect and mechanical loadings. The notched specimens are White fir and Okume with dimensions equal to 160x12x60mm and notch length of 20mm. These specimens were tested in 3-point bending for 5 days under an initial stress of 80% of the rupture stress. At the end of these 5 days, we applied a second stress corresponding to 100% of the rupture stress. These tests were carried out under a sorption cycle of 45-75% relative humidity and at a constant temperature of 20°C. Monitoring of the crack propagation w performed by using an USB micro cope. The r sults show th t the crack propagation is accentuated by the drying effects on the one hand and by the effects of the applied stress on the other hand. The results show that crack propagati n is influenced by viscoelastic eff cts, and by mechano-sor tive eff ts as shown in Figure 1. The crack propagation is more important wh n mechan -sorptive effects ccur, specially du ing th drying. Keywords: Energy release rate;Crack propagation; Mechano-sorptive creep;Viscoelastic creep; ICSI 2021 The 4th International Conference on Structural Integrity Impact of mechano-sorptive loading on crack propagation of notched beams of White fir and Okume Martian Asseko Ella a ,Giacomo Goli c , Samuel Ikogou b , Joseph Gril a,e , Eric Fournely a , Gaël Godi a , Rostand Moutou Pitti a,d * a Clermont Auvergne Université, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000 Clermont-Ferrand, France martian.asseko_ella@etu.uca.fr b USTM, Ecole Polytechnique de Masuku, BP 901 Franceville, Gabon c University of Florence, DAGRI-Department of Agriculture, Food, Environment and Forestry, 50145 Firenze, Italia d CENAREST, IRT, BP 14070, Libreville, Gabon e Université Clermont Auvergne, INRA, PIAF, F-63000 Clermont Ferrand, France ICSI 2021 The 4th International Conference on Structural Integrity Impact of mechano-sorptive loading on crack propagation of notched beams of White fir and Okume Martian Asseko Ella a ,Giacomo Goli c , Samuel Ikogou b , Joseph Gril a,e , Eric Fournely a , Gaël Godi a , Rostand Moutou Pitti a,d * a Clermont Auvergne Université, CNRS, Clermont Auvergne INP, Institut Pascal, F-63000 Clermont-Ferrand, France martian.asseko_ella@etu.uca.fr b USTM, Ecole Polytechnique de Masuku, BP 901 Franceville, Gabon c University of Florence, DA RI-Department of Agriculture, Food, Environmen and Forestry, 50145 Firenze, Italia d CENAREST, IRT, BP 14070, Libreville, Gabon e Université Clermont Auvergne, INRA, PIAF, F-63000 Clermont Ferrand, F ance

*Rostand Moutou Pitti Tel. : +3306795A82425 rostand.moutou_pitti@uca.fr

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.112 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Migue Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira *Rostand Moutou Pitti Tel. : +3306795A82425 rostand.moutou_pitti@uca.fr