Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 46 for “"impact response"”.
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Impact response of interleaved composite materials
The need for better impact resistant composites has resulted in the development of many toughened resin systems. A combination of a tougher resin system along with higher strength fibers increases the impact resistance of the composite. The use of an adhesive layer between two plies of the improved …
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Blast and impact response of elastomer-coated concrete
… from the detrimental effects of blast and impact. While new structures can be designed with this threat in mind, existing, ageing infrastructure remains vulnerable. Structural retrofit for blast and impact mitigation is one solution to this problem. This work considers one practical, …
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Effect of fatigue loading on impact response of rat ulna
… fracture is a consequence of both fatigue and impact loading of the bone that will potentially threat athletes’ careers. Scientists and engineers have studied the fatigue properties of many engineering materials, and more recently biological materials. Investigating the role of fatigue on …
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Impact Response and Failure of a Textile Composite Fuselage Frame
Impact tests are performed on two circular circumferential frame segments using a drop tower apparatus. These frames have a nominal radius of 120 inches, a forty-eight - degree included angle, a thin-walled cross section in the shape of the letter J, and are typical of the transverse fuselage …
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Impact response of composite structures to rigid and flexible projectiles
Numerical schemes are developed to study the impact response of composite structures to rigid (spherical masses) and flexible (uniform and nonuniform bars) projectiles. In the first phase of this study the impact response of imperfect ]aminated cylindrical panels to rigid projectiles is …
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Impact and post-impact response of graphite/epoxy and Kevlar/epoxy structures
… in M.I.T. Graduate List, September 1987: Impact and post-impact response of laminated structures.
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The effects of tensile preloads on the impact response of carbon/epoxy laminates
Low velocity drop weight impact tests were conducted on carbon/epoxy laminates under various magnitudes of uniform tensile stress. The composite plates were 8 ply (+45,0,- 45,90)<sub>s</sub> laminates supported in a clamped-clamped/free-free configuration. Tensile preloads from near zero to …
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Low velocity impact response of rc beam with artificial polyethylene aggregate as concrete block infill
… Based on the experimental results, the impact force, displacement and crack patterns were affected by the impact load. For RCAI specimens, the impact force was larger but smaller displacement value was observed, compared to the NRC specimens. Furthermore, the width of the cracks …
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Computational modeling of the impact response of Roma Plastilina across a wide range of strain rates
… One of the tests in the protocol consists of impacting the helmet material plates with a high-velocity projectile and the performance assessment is based on the permanent deformation of the backing-material, Roma Plastilina clay. This work focuses on the development of a computational …
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Low velocity impact response of laminated textile coir-aramids/epoxy hybrid composites subjected to transverse penetration loading
… fibre has been found to have a high potential as impact resistance, in which brittle fibre helps to spread the impact energy over a wider area. The focus of the study is to determine if any improvement in impact response exists as a result of combining high performance Kevlar synthetic fibre and …
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A laboratory simulation of low velocity projectile impact on thin plates
… that will both accurately simulate a projectile impact event and provide an accurate means of analysing a material response to projectile impact events. A low velocity apparatus, based on the conventional instrumented drop tower apparatus, was designed and constructed. The apparatus is …
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Effect of 3D Architecture on Energy Dissipation during High-speed Particle Impact
… unexplored. Here, using supersonic microparticle impact, the impact response of different 3D-printed microscale architectures are compared to each other and a non-architected mass equivalent sample to examine the effect of architecture on material impact response. This response is analyzed in a …
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Traumatic Brain Injury Mechanisms in the Gottingen Minipig in Response to Two Unique Input Modes
… potential, but this metric does not relate an impact to underlying damage. For an injury metric to effectively predict TBI, it is crucial to relate level of impact to resulting injury. The research presented in this dissertation explains the development and repeatability of two novel injury …
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Parametric impact characterisation of a solid sports ball, WITH a view to developing a standard core for the GAA Sliotar
… of this research was to characterise the dynamic impact behaviour of the sliotar core. Viscoelastic characterisation of the balls was conducted for a range of impact speeds. Modern polymer balls exhibited strain and strain-rate sensitivity while traditional multi-compositional balls exhibited …
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Impact damage behaviour of lightweight materials
Impact damage resistance is an essential requirement of lightweight structural components for high-performance applications. The aim of this thesis is to study the impact damage and perforation behaviour of lightweight materials including thin aluminium alloy plates and carbon fibre reinforced …
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Computational Design of Transparent Polymeric Laminates subjected to Low-velocity Impact
… understanding of their deformations under impact loading and of energy dissipation mechanisms is needed for minimizing their weight. This requires verified and robust computational algorithms and validated mathematical models of the problem. Here we have developed a mathematical model for …
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Simulation intent for multi-fidelity composite structural analysis
… structural environments on local laminate impact response and residual strength.
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Crashworthiness of Side Impact Beams
… carried out into the crashworthiness of side impact beams. Two specific beams were investigated: a commercially used steel beam and a prospective composite beam made from a glass fibre weave within a polypropylene matrix. The components were simply supported and were subjected to quasi-static …
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Avl And Response Time Reduction: Image And Reality
… military's global positioning system, may impact response time to law enforcement calls for service. In order to evaluate the impacts of AVL on response time to calls for service at the Altamonte Springs Police Department (ASPD), computer aided dispatch (CAD) data from years 1999 to 2003 …
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Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
… dynamics of PTMO, as well as high-strain-rate impact response. In Chapter 3, we describe the living cationic ring-opening polymerization of a 2-alkylthio-2-oxazoline as a general platform for postpolymerization modification. Mild substitution conditions provide broad functional group tolerance, …
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