Microstructure and indentation damage resistance of ZrB 2 ‐20 vol.%SiC ipo‐eutectic composites

2017 ◽  
Vol 15 (3) ◽  
pp. 619-624 ◽  
Author(s):  
Jiamin Zhou ◽  
Degui Zhu ◽  
Haiwen Zhang ◽  
Iurii Bogomol ◽  
Salvatore Grasso ◽  
...  
Keyword(s):  
Damage Resistance ◽  
Indentation Damage

Damage Characterization in Glass/Epoxy Composite Laminates under Normal and Oblique Planes of Cyclic Indentation Loading with AE Monitoring

2021 ◽  
Vol 79 (1) ◽  
pp. 61-77
Author(s):  
A Jayababu ◽  
V Arumugam ◽  
B Rajesh ◽  
C Suresh Kumar
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Cyclic Loading ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Damage Resistance ◽  
Damage Initiation ◽  
Residual Compressive Strength ◽  
Cyclic Indentation ◽  
Indentation Damage

This work focuses on the experimental investigation of indentation damage resistance in different stacking sequences of glass/epoxy composite laminates under cyclic loading on normal (0°) and oblique (20°) planes. The stacking sequence, such as unidirectional [0]12, angle ply [±45]6S, and cross ply [0/90]6S, were subjected to cyclic indentation loading and monitoring by acoustic emission testing (AE). The laminates were loaded at the center using a hemispherical steel indenter with a 12.7 mm diameter. The cyclic indentation loading was performed at displacements from 0.5 to 3 mm with an increment of 0.5 mm in each cycle. Subsequently, the residual compressive strength of the post-indented laminates was estimated by testing them under in-plane loading, once again with AE monitoring. Mechanical responses such as peak load, absorbed energy, stiffness, residual dent, and damage area were used for the quantification of the indentation-induced damage. The normalized AE cumulative counts, AE energy, and Felicity ratio were used for monitoring the damage initiation and propagation. Moreover, the discrete wavelet analysis of acoustic emission signals and fast Fourier transform enabled the calculation of the peak frequency content of each damage mechanism. The results showed that the cross-ply laminates had superior indentation damage resistance over angle ply and unidirectional (UD) laminates under normal and oblique planes of cyclic loading. However, the conclusion from the results was that UD laminates showed a better reduction in residual compressive strength than the other laminate configurations.

Investigation of indentation damage resistance on normal and inclined plane of glass/epoxy composite laminates using acoustic emission monitoring

2020 ◽  
Vol 54 (21) ◽  
pp. 2953-2964 ◽  
Author(s):  
A Jayababu ◽  
V Arumugam ◽  
B Rajesh ◽  
C Suresh Kumar
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Glass Fiber ◽  
Fiber Reinforced Polymer ◽  
Glass Fiber Reinforced Polymer ◽  
Damage Resistance ◽  
Reinforced Polymer ◽  
Emission Monitoring ◽  
Glass Fiber Reinforced ◽  
Indentation Damage

This work relates to the investigation of indentation induced damage resistance in glass fiber reinforced polymer composite laminates under normal and inclined planes. Uni-directional [0] and cross-ply [0/90] glass fiber reinforced polymer composite specimens were subjected to 0° and 20° indentation loading with acoustic emission monitoring. The specimens were loaded at the centre using a hemispherical steel indenter with 12.7 mm diameter. Mechanical responses such as force–displacement behavior, absorbed energy and resulting damage area were used for the quantification of the indentation damage. Acoustic responses such as normalized cumulative counts, energy, duration and peak frequency were considered for monitoring damage progression during 0° and 20° indentation loading. The residual compressive strength of the glass fiber reinforced polymer specimens following indentation was measured by testing them under in-plane loading, once again with acoustic emission monitoring. The correlation between mechanical and acoustic strain energy was used for the evaluation of the damage severity of the laminates. The result revealed indentation damage resistance in cross-ply laminates as 65.08% and 68.01% higher than uni-directional laminates for 0°, whereas for 20°, there was a reduction in the damage resistance in cross-ply laminates to 43.27% and 57.39%. These were higher than uni-directional laminates under the displacements of 2 mm and 3 mm, respectively. The conclusion from these results was that transverse shear load at 20° inclination of laminate leads to reduction in residual compressive strength. Moreover, uni-directional glass/epoxy laminates have better residual compressive strength than cross-ply laminates for both 2 mm and 3 mm indentation displacements.

Effects of Indenter Tips of Quasi-Static Indentation Damage of Foam Sandwich Composites

2014 ◽  
Vol 1061-1062 ◽  
pp. 215-219
Author(s):  
Azzam Ahmed ◽  
Li Wei
Keyword(s):  
Sandwich Panel ◽  
Failure Modes ◽  
Static Load ◽  
Material Selection ◽  
Optical Microscope ◽  
Sandwich Composites ◽  
Damage Resistance ◽  
Static Indentation ◽  
Primary Damage ◽  
Indentation Damage

The behavior of foam sandwich composites subjected to the quasi-static load has been investigated. The results revealed that the indenter tip shapes have an influence on the indentation behavior of the specimens. Failure modes were studied by sectioning the samples at the damage location and observing under an optical microscope. The primary damage mode was found to be the fiber breakage, delamination and foam crack. Knowledge of the damage resistance properties of a sandwich panel is useful for product development and material selection.

Damage Characterization in Glass/Epoxy Composite Laminates under Normal and Oblique Planes of Cyclic Indentation Loading with AE Monitoring

2021 ◽  
Vol 79 (1) ◽  
pp. 61-77
Author(s):  
A. Jayababu ◽  
V. Arumugam ◽  
B. Rajesh ◽  
C. Suresh Kumar
Keyword(s):  
Compressive Strength ◽  
Acoustic Emission ◽  
Cyclic Loading ◽  
Composite Laminates ◽  
Epoxy Composite ◽  
Damage Resistance ◽  
Damage Initiation ◽  
Residual Compressive Strength ◽  
Cyclic Indentation ◽  
Indentation Damage

This work focuses on the experimental investigation of indentation damage resistance in different stacking sequences of glass/epoxy composite laminates under cyclic loading on normal (0°) and oblique (20°) planes. The stacking sequence, such as unidirectional [0]12, angle ply [±45]6S, and cross ply [0/90]6S, were subjected to cyclic indentation loading and monitoring by acoustic emission testing (AE). The laminates were loaded at the center using a hemispherical steel indenter with a 12.7 mm diameter. The cyclic indentation loading was performed at displacements from 0.5 to 3 mm with an increment of 0.5 mm in each cycle. Subsequently, the residual compressive strength of the post-indented laminates was estimated by testing them under in-plane loading, once again with AE monitoring. Mechanical responses such as peak load, absorbed energy, stiffness, residual dent, and damage area were used for the quantification of the indentation-induced damage. The normalized AE cumulative counts, AE energy, and Felicity ratio were used for monitoring the damage initiation and propagation. Moreover, the discrete wavelet analysis of acoustic emission signals and fast Fourier transform enabled the calculation of the peak frequency content of each damage mechanism. The results showed that the cross-ply laminates had superior indentation damage resistance over angle ply and unidirectional (UD) laminates under normal and oblique planes of cyclic loading. However, the conclusion from the results was that UD laminates showed a better reduction in residual compressive strength than the other laminate configurations.

Microstructure and texture contributing to damage resistance of the anosteocytic hinge-bone in the cleithrum of Esox lucius

2020 ◽  
Vol 111 (1) ◽  
pp. 78-85 ◽  
Author(s):  
Katrein Sauer ◽  
Alexander Rack ◽  
Hawshan Abdulrahman Mustafa ◽  
Mario Thiele ◽  
Ron Shahar ◽  
...  
Keyword(s):  
Esox Lucius ◽  
Damage Resistance

Laser Damage Resistance of Photo-Thermo-Refractive Glass Bragg Gratings

2004 ◽  
Author(s):  
Leonid B. Glebov ◽  
Larissa N. Glebova ◽  
Vadim I. Smirnov ◽  
Mark Dubinskii ◽  
Larry D. Merkle ◽  
...  
Keyword(s):  
Bragg Gratings ◽  
Laser Damage ◽  
Damage Resistance

scholarly journals High-Entropy Alloys for Advanced Nuclear Applications

Entropy ◽  
2021 ◽  
Vol 23 (1) ◽  
pp. 98
Author(s):  
Ed J. Pickering ◽  
Alexander W. Carruthers ◽  
Paul J. Barron ◽  
Simon C. Middleburgh ◽  
David E.J. Armstrong ◽  
...  
Keyword(s):  
Austenitic Steels ◽  
Irradiation Damage ◽  
High Entropy Alloys ◽  
Damage Resistance ◽  
High Entropy ◽  
Engineering Alloys ◽  
Sluggish Diffusion ◽  
Work Done ◽  
Current Engineering ◽  
Nuclear Applications

The expanded compositional freedom afforded by high-entropy alloys (HEAs) represents a unique opportunity for the design of alloys for advanced nuclear applications, in particular for applications where current engineering alloys fall short. This review assesses the work done to date in the field of HEAs for nuclear applications, provides critical insight into the conclusions drawn, and highlights possibilities and challenges for future study. It is found that our understanding of the irradiation responses of HEAs remains in its infancy, and much work is needed in order for our knowledge of any single HEA system to match our understanding of conventional alloys such as austenitic steels. A number of studies have suggested that HEAs possess `special’ irradiation damage resistance, although some of the proposed mechanisms, such as those based on sluggish diffusion and lattice distortion, remain somewhat unconvincing (certainly in terms of being universally applicable to all HEAs). Nevertheless, there may be some mechanisms and effects that are uniquely different in HEAs when compared to more conventional alloys, such as the effect that their poor thermal conductivities have on the displacement cascade. Furthermore, the opportunity to tune the compositions of HEAs over a large range to optimise particular irradiation responses could be very powerful, even if the design process remains challenging.

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