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.
Results
Showing 1 to 20 of 34 for “"impact load"”.
-
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 …
-
Measuring the fracture energy of bed breakage using a short impact load cell
… breakage occurs mainly through three mechanisms: impact, abrasion and attrition. Of these mechanisms, impact breakage is known to be the most basic form of particle size reduction. Comminution devices are highly inefficient, as the energy used for particle breakage relative to that consumed by the …
-
Compression After Impact Load Prediction in Graphite/Epoxy Laminates Using Acoustic Emission and Artificial Neural Networks
… (ANNs) in predicting the compression after impact (CAI) load of graphite/epoxy laminates from acoustic emission (AE) nondestructive testing (NDT) data. Thirty-four 24-ply bidirectional woven cloth laminate coupons were constructed and impacted at various energy levels ranging from 8 to 20 …
-
Ultimate Compression After Impact Load Prediction in Graphite/Epoxy Coupons Using Neural Network and Multivariate Statistical Analyses
… to accurately predict the ultimate compressive load of impact damaged graphite/epoxy coupons using a Kohonen self-organizing map (SOM) neural network and multivariate statistical regression analysis (MSRA). An optimized use of these data treatment tools allowed the generation of a simple, …
-
Analytical behaviour of FRP strengthened reinforced concrete beams under low velocity impact load incorporating rate dependant material constitutive models
… methods. In addition to strengthening for static loading, there are many scenarios where strengthening is required to elements subjected to dynamic loads. The static behaviour of FRP strengthened RC beams has been the subject of extensive research. However, the dynamic behaviour of FRP …
-
The effects of impact loading on reinforced concrete panels
An investigation into the effects of impact loading on reinforced concrete panels (slabs) was conducted. The impact load was generated by means of a compound pendulum. The impact load was increased by increasing the height from which the pendulum was released as well as by the addition of weights …
-
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 …
-
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 …
-
A photoelastic study of stress distribution in a spur gear tooth
… all, many uncertainties in service such as the impact load, acceleration load and work hardening are involved. These uncertainties make it difficult to get a general solution. The photoelastic method is an effective one for making a static study of gear stress, but it is understood that this …
-
A numerical study on the effect of bow flare angle on green water loading on FPSO
… of the ship. Floating production storage and offloading vessels (FPSO) are commonly operated at a certain position and located to encounter mainly bow waves for the purpose of a decrease in roll motions.;This study is focused on the analysis of the effects of the bow flare angle above the free …
-
Low magnitude high frequency vibrations applied to the foot through the pedal of a human powered artificial gravity (HPAG) cycle
… weeks to months. Current countermeasures employ impact and high force loading to maintain bone health. An astronaut runs on a treadmill to impact load the weight bearing components of the musculoskeletal system. Elastic bands provide the "down" force for the astronaut while running. For high …
-
An exploratory study on the experiences of female youth victims of crime during load shedding in Site C, Khayelitsha
Load shedding has become a common problem in South Africa, resulting in daily disruptions affecting every sector of life. Load shedding is a planned and temporary disruption of energy supply to specific areas. The present study explored the experiences of crime of female youth during load shedding …
-
Destructive disassembly of bolts and screws using impact
… during use. As a natural solution, mechanical impact has been suggested as a cost-effective method for destructive disassembly of joining elements. The objective of this research is to improve the efficiency of impact disassembly process by studying the characteristics of elastic waves caused …
-
The effect of cracks on the dynamic behavior of bars and shafts
… studied. Finally, the effect of a periodic axial impact load is considered.
-
Progressive damage and failure of unidirectional fiber reinforced laminates under impact loading with composite properties derived from a micro-mechanics approach
… 16-ply unidirectional fiber reinforced laminates impacted at normal incidence by a rigid sphere. The damage is assumed to initiate when at least one of Hashin's failure criteria is satisfied with the evolving damage modeled by an exponential relation. Transient three dimensional impact problems …
-
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 …
-
Impact Mechanics of PMMA/PC Multi-Laminates with Soft Polymer Interlayers
… of how a soft interlayer affects the impact response and energy dissipation mechanisms of all-polymer multi-laminates. An instrumented, intermediate impact velocity experimental setup with strain rates on the order of 100 s-1, is used to assess the impact mechanics of three-layered …
-
Success factors for bumiputra contractors in Malaysia : Johor state
… in resources group are giving the highest impact load of 0.299 to the success of Bumiputra contractors. Hopefully, the findings from this study will be a constructive guide to Bumiputra contractors to improve their potentials to be successful in the competitive construction business.
-
Shear flow localization in thermoviscoplastic materials and a numerical study of dynamic problems in continuous media
… One face of the disk is subjected to an impact load while the rest of the surface is traction-free. A stability condition based on the classical von Neumann analysis is also derived. The numerical results compare excellently with analytical results from a modal analysis. Finally, in the …
-
Impulse loading of near-field shallow-buried explosions
… The lethal aspects of buried mines (target loading mechanisms), such as the detonation shock load, impact load and distributed load, are identified and discussed. Important parameters influencing anti-vehicular blasts, such as standoff distance, soil effects, mine composition and geometry …
Page 1 of 2