Journal ArticleDOI
Acoustic emission from composite-reinforced metals
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TLDR
In this paper, the acoustic emission count rates for tensile loading of unidirectional boron-epoxy and aluminum sheets reinforced with unIDirectional BORON-EPoxy are presented.Abstract:
Acoustic-emission (AE) count rates are presented for tensile loading of unidirectional boron-epoxy and for aluminum sheets reinforced with unidirectional boron-epoxy. It is shown that different prepreg materials have different characteristic AE patterns. Results from composite-reinforced metal specimens show that early failures are accompanied by a sharp increase in AE count rate at the knee of the bilinear stress-strain diagram. It is further shown that the count rates are a function of specimen fabrication and that higher total counts do not necessarily correspond to early failures.read more
Citations
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Journal ArticleDOI
Acoustic Emission Monitoring of Fiber Composite Materials and Structures
James H. Williams,Samson S. Lee +1 more
TL;DR: A review of the current acoustic emission literature relating to fiber reinforced composite materials is presented in this paper, where the authors present summary tables which assist m the prompt delineation of the achievements in this research area.
Journal ArticleDOI
Permanent deformation of compact bone monitored by acoustic emission.
TL;DR: Test on control, decalcified and deproteinized groups of specimens demonstrated that the post-yield or ‘plastic’ slope of the stress-strain curve for unaltered bone is dependent on collagen properties, while the elastic modulus and yield phenomenon appear more dependent on the mineral phase.
Journal ArticleDOI
Analysis of the effect of using two different strain rates on the acoustic emission in bone
TL;DR: To study the effect of strain rate on the acoustic emission amplitude signature of bone, bovine cortical bone was milled into standard tensile specimens which were tested at two different strain rates while being monitored with acoustic emission equipment.
Journal ArticleDOI
Assessment of damage in GRP laminates by stress wave emission and dynamic mechanical measurements
TL;DR: In this paper, stress wave emission (SWE) and dynamic mechanical methods are described for monitoring the damage introduced into certain glass fibre-reinforced epoxy specimens by the application of a tensile load.
Journal ArticleDOI
An Acoustic Emission Energy Analysis and Its Use to Study Damage in Laminated Composites
R Mohan,Gangan Prathap +1 more
TL;DR: In this paper, the output of a true RMS voltmeter was used to measure the acoustic emission energy output of transducers during tensile tests on [0°/±30°/90°]s glass-epoxy laminate uniaxial and 10° off-axis tensile coupons.
References
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Journal ArticleDOI
Analysis of Composite Failure Mechanisms Using Acoustic Emissions
R.L. Mehan,J. V. Mullin +1 more
TL;DR: In this paper, the authors were able to isolate three basic failure mechanisms by optical means, which were caused by tensile load of epoxy specimens containing only a few fibers, including fiber fracture, matrix cracking, and interfacial debonding.
Journal ArticleDOI
Evaluation of Composite Failures through Fracture Signal Analysis
JV Mullin,RL Mehan +1 more
TL;DR: In this article, the use of acoustic monitoring techniques to identify specific failure mechanisms in composite materials is described, where the authors use the frequency content and nature of the signals as a means for identifying specific critical events in the fracture process.
Book ChapterDOI
Reinforcement of metals with advanced filamentary composites
TL;DR: In this paper, the tensile strength of aluminum and titanium reinforced with unidirectional boron/epoxy was investigated for tubular and flat specimens, bonded at either room temperature or elevated temperature.
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