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 57 for “"Impact test"”.
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A standard impact test procedure for football/hockey shoulder pads
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
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Wind-Borne Debris Resistance of Façades: Identification of Alternative Impact Test Requirements
… hospital, most of the windows were broken by the impact of wind-borne debris. The structure of the hospital has remained intact and only one section of the building was not affected by façade breakage: the Behavioral Health Unit, a result that was ensured by breakage-resistant windows. To avoid …
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ULTRA-HIGH STRAIN RATE CONSTITUTIVE MODELING OF PURE TITANIUM USING PARTICLE IMPACT TEST
With the advent of advanced testing strategies like laser-induced particle impact test, it is possible to study materials mechanics under extremely high deformation rates, i.e., above 10^6 s^-1, a relatively less explored regime of strain rates. In this study, we accelerate microparticles of …
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Taylor Impact Test and Penetration of Reinforced Concrete Targets by Cylindrical Composite Rods
… DYNA3D to analyze two problems: (a) the normal impact of a cylindrical monolithic or composite rod against a smooth flat rigid target, (commonly known as the Taylor impact test), and (b) the penetration of composite and monolithic steel cylindrical rods into reinforced concrete targets. The …
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Plasticity and impact test studies on thermoplastic materials, finite element analysis and experimental correlation
… bending and puncture or plate penetration test results with the corresponding FEA calculations. The studies were carried out in concern to the slow rate testing and finite element analysis of two thermoplastic materials. The selected materials were a blend of Polycarbonate (PC) and …
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Investigation of Taylor impact test of isotropic and anisotropic material through geometrical characteristics of specimens
… alloy) are investigated using Taylor impact tests. Coordinate measuring machines (CMMs) are used to measure the shape of specimens after the deformation. The geometrical data enables us to determine the plastic distributions and the dynamic yield stresses of specimens. A raise in yield …
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The use of a 1/4 scale impact test plant for simulating railroad switching operations
Thesis (M.S.)--Michigan State University. Dept. of Forest Products, School of Packaging, 1966
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An investigation into the impact fracture behaviour of poly (propylene-ethylene) copolymers using an instrumented low temperature drop weight impact tester
This dissertation examines the drop weight impact behaviour and fracture of poly (propylene - ethylene) copolymers at cryogenic temperatures. A cryogenic temperature facility was incorporated into the existing instrumented drop weight impact tester to allow for variation of the impact test …
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Non-Contact NDT of Concrete Structures Using Air -Coupled Sensors
The second application is air-coupled impact-echo. Two reinforced concrete slabs containing different types of defects were inspected using an air-coupled impact test testing scheme. 2-D scanning impact-echo tests were conducted over the slab containing voids and delaminations. The 2-D scanning …
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Finite Element Analysis of Adiabatic Shear Bands in Impact and Penetration Problems
… uranium (DU) and tungsten heavy alloy (WHA) rods impacting at normal incidence both a rigid, planar target and a thick, deformable steel target. Each deformable material is modeled as elastic thermoviscoplastic; the flow stress increases with an increase in the effective plastic strain and …
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ΔΟΜΙΚΟΙ ΜΕΤΑΣΧΗΜΑΤΙΣΜΟΙ ΚΑΤΑ ΤΗΝ ΑΝΟΠΤΗΣΗ ΑΝΟΞΕΙΔΩΤΩΝ ΦΕΡΡΙΤΙΚΩΝ ΧΑΛΥΒΩΝ ΚΑΙ Η ΕΠΙΔΡΑΣΗ ΤΟΥΣ ΣΤΗ ΣΥΜΠΕΡΙΦΟΡΑ ΚΑΤΑ ΤΗ ΘΡΑΥΣΗ ΚΑΙ ΚΑΤΑ ΤΗΝ ΟΞΕΙΔΩΣΗ ΥΨΗΛΗΣ ΘΕΡΜΟΚΡΑΣΙΑΣ
… REDUCED THE ABSORBED ENERGY IN CHARPY-V IMPACT TEST. THE ZR AND TI ADDITIONS FAVOURED THE INCREASE OF THE BRITTLENESS OF THE ALLOYS, WHILE NI ADDITION HAD THE OPPOSITE EFFECT. THE ZR AND NIADDITION IMPROVED THE HIGH TEMPERATURE OXIDATION RESISTANCE OF THE ALLOYS.
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The Variability of Strains in Bolts and the Effect on Preload in Jointed Structure
… larger the expected uncertainty in preload. Impact test results also indicate the advantages of pre-strain method for tightening bolts compared to torque wrenches.
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Formation of Ti₃Al and its embrittling effects on titanium-aluminum alloys
… metallography, the Brown-type stress corrosion test and the Charpy V-notch Impact test. Segregated microstructures resulting from annealing in the (α+β) region were found to be extremely difficult to homogenize below the α-transus and could possibly explain the two-phase regions reported by many …
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Does Poverty Really Impede Cognitive Function? Experimental Evidence from Tanzanian Fishers
… function. Fishers in the experiment are tested on how exposure to a ‘scarcity trigger’ impacts cognition and productivity through measuring performance on problem solving tasks. The study also creates an index of distractions to test how existing problems in an individual’s life, which …
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Análise modal operacional de uma bomba centrífuga submersa utilizando a decomposição melhorada no domínio da frequência
… installed in a mock well through operational and impact tests. The operational modal analysis method employed was the Enhanced Frequency Domain Decomposition (EFDD). The same method was used to identify the modal parameters through impact tests. An EFDD algorithm was developed and tested using …
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Analysis of a car door subjected to side impact
… in this thesis focuses on the response of a side impact beam located in a car door to impact loading in close conformation to the Federal Motor Vehicle Safety Standard 214 (FMVSS 214) standard. The side impact beam is situated in both the front and rear side doors of a vehicle between the inner …
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Identification of dynamic properties of materials for the nuclear waste package
… that the behavior of these materials under impact loading was not well documented. Second, testing equipment is selected to match the appropriate specimen type. Two machines are used for the experimental part of the project: MTS Axial/Torsion Material testing system and Instron Dynatup …
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Continuum mechanical analysis of space and time dependent deformation pattern of brain with blunt injury
Deformation of human brain due to acceleration impact has been widely accepted as the direct connection to the Trauma Brain Injury (TBI). However, the limitation of obtaining deformation data of TBI is a major obstacle to understanding TBI mechanism. This experiment mainly focuses on developing a …
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Low-velocity Impact Analysis of Composite Repair Patches of Different Shapes
… by the use of composite materials. Low velocity impact can cause barely visible damage to the interior structure of laminated composite. These impacts can cause delamination in composite materials. In this study, a Finite Element Analysis was conducted using Abaqus/Explicit and the results of the …
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Relationships between MIBANT bend angles and selected material properties of pallet fasteners
… theory of a rigid-perfectly plastic solid when impact loaded was used to relate the dynamic yield strength and MIBANT bend angle of driven steel fasteners. Static yield strength values for pallet nails were found to values (p > 0.0001 be linearly related to the dynamic 2 and R² = 0.950) and …
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