Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy
This paper investigates the effect of mean shear stress on short-beam shear fatigue in a GLARE 1-3/2 commercial fiber–metal laminate (FML). This study explores three shear stress ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline">...
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2025-06-01
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| author | Douglas G. Caetano Hector G. Kotik Juan E. Perez Ipiña Enrique M. Castrodeza |
| author_facet | Douglas G. Caetano Hector G. Kotik Juan E. Perez Ipiña Enrique M. Castrodeza |
| author_sort | Douglas G. Caetano |
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| description | This paper investigates the effect of mean shear stress on short-beam shear fatigue in a GLARE 1-3/2 commercial fiber–metal laminate (FML). This study explores three shear stress ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.1, 0.3, and 0.5) and two material orientations (longitudinal and transversal) under constant amplitude fatigue. Different stress levels for each <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> value were explored to obtain failures between 10<sup>3</sup> and 10<sup>6</sup> load cycles. The experimental results reveal anisotropy, with transversal specimens exhibiting lower performance and increased scatter. The mean shear stress effect is discussed herein, with insights into the critical role of mean shear of fatigue performance. <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.1 was the most severe condition and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.5 was the least severe. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.3 condition produced steeper S-N curves, indicating that the combined effect of mean shear stress and shear stress amplitude led to a higher rate of damage accumulation. The fractographic analysis investigated the failure modes and confirmed the damage dominated by Mode II, supporting the test methodology employed. |
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| spelling | doaj-art-11e2d017b68946a29a09de8de754259c2025-08-20T03:27:22ZengMDPI AGFibers2079-64392025-06-011367710.3390/fib13060077Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and AnisotropyDouglas G. Caetano0Hector G. Kotik1Juan E. Perez Ipiña2Enrique M. Castrodeza3Laboratório de Materiais Compósitos (LaCom), Programa de Pós-Graduação em Engenharia Metalúrgica e de Materiais (PEMM), COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro CEP 21941-972, RJ, BrazilLaboratório de Materiais Compósitos (LaCom), Programa de Pós-Graduação em Engenharia Metalúrgica e de Materiais (PEMM), COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro CEP 21941-972, RJ, BrazilLaboratório de Materiais Compósitos (LaCom), Programa de Pós-Graduação em Engenharia Metalúrgica e de Materiais (PEMM), COPPE, Universidade Federal do Rio de Janeiro, Rio de Janeiro CEP 21941-972, RJ, BrazilDepartment of Mechanical Engineering, Politecnico di Milano, Via La Masa 34, 20156 Milan, MI, ItalyThis paper investigates the effect of mean shear stress on short-beam shear fatigue in a GLARE 1-3/2 commercial fiber–metal laminate (FML). This study explores three shear stress ratios (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.1, 0.3, and 0.5) and two material orientations (longitudinal and transversal) under constant amplitude fatigue. Different stress levels for each <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> value were explored to obtain failures between 10<sup>3</sup> and 10<sup>6</sup> load cycles. The experimental results reveal anisotropy, with transversal specimens exhibiting lower performance and increased scatter. The mean shear stress effect is discussed herein, with insights into the critical role of mean shear of fatigue performance. <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.1 was the most severe condition and <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.5 was the least severe. The <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msub><mrow><mi mathvariant="bold-italic">R</mi></mrow><mrow><mi mathvariant="bold-italic">τ</mi></mrow></msub></mrow></semantics></math></inline-formula> 0.3 condition produced steeper S-N curves, indicating that the combined effect of mean shear stress and shear stress amplitude led to a higher rate of damage accumulation. The fractographic analysis investigated the failure modes and confirmed the damage dominated by Mode II, supporting the test methodology employed.https://www.mdpi.com/2079-6439/13/6/77short-beam shear fatigueGLAREfiber–metal laminateinterlaminar shearmean shear stress effect |
| spellingShingle | Douglas G. Caetano Hector G. Kotik Juan E. Perez Ipiña Enrique M. Castrodeza Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy Fibers short-beam shear fatigue GLARE fiber–metal laminate interlaminar shear mean shear stress effect |
| title | Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy |
| title_full | Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy |
| title_fullStr | Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy |
| title_full_unstemmed | Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy |
| title_short | Short-Beam Shear Fatigue Behavior on Unidirectional GLARE: Mean Shear Stress Effect, Scatter, and Anisotropy |
| title_sort | short beam shear fatigue behavior on unidirectional glare mean shear stress effect scatter and anisotropy |
| topic | short-beam shear fatigue GLARE fiber–metal laminate interlaminar shear mean shear stress effect |
| url | https://www.mdpi.com/2079-6439/13/6/77 |
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