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 43 for “"impact loads"”.
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Progressive damage analysis for aerospace composite structures subjected to impact loads
L'abstract è presente nell'allegato / the abstract is in the attachment
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Response and Failure of Adhesively Bonded Automotive Composite Structures under Impact Loads
… experimental technique for conducting low speed impact of adhesively bonded automotive composite joints is presented. Based on the use of a modified drop tower, mode I, II, and mixed mode values for critical energy release rate were determined for a composite/epoxy system and used to create a …
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Characterization of stresses induced in doweled joints due to thermal and impact loads
… due to the application of mechanical and thermal loads has not been previously characterized. In this study a detailed Three-Dimensional Finite Element (3D FE) model was used to investigate the state of contact stresses, mid slab stresses, and load transfer efficiency that develop in dowel jointed …
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Behaviour of ultra high performance fibre reinforced concrete subjected to static and impact loads
… disasters, usually associated with dynamic loads from earthquakes and explosion loads, can cause large scale catastrophic failures. These events produce non-uniform forces in structures which lead in failure mechanisms resulting in progressive collapse. The increasing requirements for …
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Neural Network Prediction of Ultimate Compression After Impact Loads in Graphite-Epoxy Coupons from Ultrasonic C-Scan Images
… network could predict the ultimate compressive loads of impact damaged 24-ply graphite-epoxy coupons from ultrasonic C-scan images. The 24-ply graphite-epoxy coupons were manufactured with bidirectional preimpregnated tape and cut into 21 coupons, 4 inches by 6 inches each. The coupons were …
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Development of experimental and numerical methodologies for the investigation of composite and hybrid metal-composite fastened joints subjected to impact loads
… several fasteners, is conducted under dynamic (impact) and quasi-static loading conditions with the aid of efficient experimental and numerical methodologies developed for these purposes. With respect to the experimental activities, the quasi-static and dynamic (medium strain rate regime) tests …
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The influences of string tension and frame stiffness on racquet and ball motions, and on impact loads at the elbow joint during the tennis backhand drive
… of the ball and frame during and just after impact was inferred from the acceleration-time change of an accelerometer instrumented impactor pendulum, and the strain-time change of the frame during the clamped racket impact. The impulsive loads acting on the elbow joint were estimated by …
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Finite element analysis of railway track under vehicle dynamic impact and longitudinal loads
Impact loads caused by flat spots on railcar wheels impose a major maintenance burden on railroads and can cause severe damage to both railcar and rail track components. In addition, the increasing tractive power of locomotives leads to significant increase in the longitudinal load demand in …
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Dynamic Behavior of Sandwich Beams With Internal Resonators
… would help attenuate low frequency periodic loads such as those associated with hull slamming. The antiresonance phenomenon was experimentally demonstrated. By inserting local resonators tuned at the first flexural resonance frequency of the beam, it was shown that the excessive vibrations …
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The design and retrofit of buildings for resistance to blast-induced progressive collapse
… codes are not necessarily able to resist extreme loads, particularly blast loads. While significant progress has been made towards the development of design guidelines for federal buildings according to threat level, comprehensive codes have not yet been devised for blast hardening of non-federal …
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Hydor-impact, fluid-structure interaction and structural response of modern racing yacht
… caused by the hydrodynamic impact or ’hydro-impact’ phenomenon by<br/>slamming.<br/><br/>The structural failure by hydro-impact originates from the facts that the external<br/>hydro-impact load and fluid structure interaction effect is somewhat misled and when<br/>applying …
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Three-dimensional, inelastic response of single-edge notch bend specimens subjected to impact loading
… subjected to short-duration loading caused by impact or blast. When the severity of impact loads is sufficient to produce large inelastic deformations, the assessment of crack-tip conditions must include the effects of plasticity, strain rate and inertia. This research examines the interaction …
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Advanced generation NIOSH automatically deployable rollover protective structure (AutoROPS)
… to insure that the base can withstand the impact loads associated with the rollover of any farm tractor. Another purpose of the investigation is to design a new generation of the AutoROPS that is smaller and cost effective. Using ANSYS software for Finite Element Analysis (FEA) simulated …
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Validation of Seaplane Impact Load Theory and Structural Analysis of the Martin 270
… how the current industry standard of estimating impact loads compares with actual pressures a seaplane is subjected to.</p> <p>Using the structural design and geometry of the M270 the seaplane hull was modeled in Maestro with a coarse mesh finite element model. The pressures from Wagner’s theory …
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Mechanical Design of a Sonar Mount for an Unmanned Surface Vehicle
… use at the bow. The bow location offers better impact protection to the sonar as long as the sonar can be positioned above the boat's draft. Field tests also exposed the need for an omnidirectional breakaway device which limits impact loads on the sonar during collisions. The Ball and Socket …
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Numerical and experimental analysis of initial water impact of an air-dropped REMUS AUV
The initial water impact of a free-falling object is primarily related to the fluid forces on the wetted surface of the object. The shape-dependent added-mass coefficients express the fluid forces integrated over the body, and thus physically represent the additional inertia of water accelerated …
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Dynamic characteristics of metals under elevated temperatures
… deformation caused by static, thermal, and impact loads. Among the most important characteristics for metals is their integrity in case of accidents, where it may be subject to dynamic loads under elevated temperatures. This thesis attempts to experimentally identify properties of the three …
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Static and dynamic large deflection flexural response of graphite- epoxy beams
… beam specimens were subjected to eccentric axial impact loads and to static eccentric axial loads, in order to assess the damage caused by impact. A geometrically and materially nonlinear analysis of the response and failure of the static test specimens is presented. The analysis employed an …
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LS-Dyna for Crashworthiness of Composite Structures
… low inter-laminar mechanical properties and poor impact resistance of fiber reinforced composite materials has limited their use. The study of axial crushing behavior of metal and composite tubes has become an important aspect for the design of crashworthy structures in aircraft and automotive …
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Application of plastic design in steel table shelters
… Centre were searched. From these materials, the impact of plasticity on the efficiency of steel frames was critically investigated. This study quantifies the savings in steel due to the use of plastic theory in the design of the Morrison Shelter. The value of savings, which was particularly …
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