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 26 for “"Accelerated testing"”.
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Contributions to planning and analysis of accelerated testing
… prevailing interest in saving time and expense,Accelerated Life Testing (ALT) and/or Accelerated Degradation Testing (ADT) are becoming an integral part of many programs for improving productsa??quality and reliability.However,appropriate analysis of ALT/ADT data and planning of ALT/ADT …
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Accelerated Testing of Separation Layers for Open-Graded Drainage Layers
An accelerated testing procedure was developed to evaluate performance of separation layers used between open-graded bases and lime stabilized subgrades. Significantly of concern was assessing separation layer performance in regard to the degree of pumping into the open-graded base and the …
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Accelerated Testing Method to Estimate the Lifetime of Polyethylene Pipes
… predict the corresponding times-to-failure using accelerated means. The aim of this study is to develop an innovative rupture lifetime acceleration protocol for PE pipes which is sensitive to the structure, orientation, and morphology changes introduced by changing processing conditions. To …
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The Development of an Accelerated Testing Facility for the Study of Deposits in Land-Based Gas Turbine Engines
… a validation of the design and operation of an accelerated testing facility for the study of foreign deposit layers typical to the operation of land-based gas turbines. It also reports on the use of this facility in an effort to characterize the change in thermal resistance on the surface of …
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Factors affecting the measurement of stability and safety of cosmetic products.
… (Colipa), which use elevated temperature stress testing to accelerate reactions, and using the Arrhenius model to extrapolate duration of shelf lives from the results. More specifically the assumption is made that any reaction observed displayed 1st order rate kinetics with respect to temperature …
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Nonlinear viscoelastic characterization of structural adhesives
… are given and fitted into a framework of an accelerated testing and analysis procedure. The single integral model used is shown to function well and is analogous to a time-temperature stress-superposition procedure (TTSSP). Advantages and disadvantages of the method accessed with the latter …
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Reliability and Data Analysis of Wearout Mechanisms for Circuits
… well as investigate the factors for accelerating testing for front-end-of-line time-dependent dielectric breakdown (FEOL TDDB). The separation of wearout mechanisms for circuits will be investigated, and the identification of failure modes for the failure samples will be analyzed. SRAMs and ring …
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Viscoelastic characterization of angle ply advanced composites
… appropriate viscoelastic theory to formulate an accelerated testing procedure. To achieve this aim, forced vibration, constant strain rate and creep tests were performed at different temperature levels. Due to its practical importance, behavior below the glass transition temperature was studied. …
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Predictive reliabilities for electronic components
… on the failure times. It can be used for accelerated testing and for lncorporating reliability at product design stage.
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The effect of additives on the molecular mobility, physical stability and dissolution of amorphous solid dispersions
… advantage. The objectives were to (i) develop an accelerated testing method for predicting the solid-state physical stability of drugs in amorphous solid dispersions (ASD), (ii) gain a mechanistic understanding of the stabilization in the amorphous state brought about by small molecule excipients, …
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Models for Data Analysis in Accelerated Reliability Growth
… work develops new methodologies for analyzing accelerated testing data in the context of a reliability growth program for a complex multi-component system. Each component has multiple failure modes and the growth program consists of multiple test-fix stages with corrective actions applied at …
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Topographic and Surface Chemical Aspects of the Adhesion of Structural Epoxy Resins to Phosphorus Oxo Acid Treated Aluminum Adherends
… and adhesive formulation, combined with accelerated testing, the chemical and mechanical factors that influence the properties of adhesively bonded aluminum are isolated and assessed. It is postulated that a combination of two factors determines the strength and environmental durability …
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Creep behavior of natural fiber reinforced polymer composites
… attempted through two approaches: modeling and accelerated testing. Burgers models were proven unsuitable for long-term prediction if the creep test time was not long enough. Comparatively, the indexed Burgers and 2-parameter power law models performed better for prediction purposes. Accelerated …
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Accelerated viscoelastic characterization of T300/5208 graphite- epoxy laminates
… and accommodated at the design stage. Accelerated testing is therefore required to allow long-term compliance predictions for composite laminates of arbitrary layup, based solely upon short-term tests. In this study, an accelerated viscoelastic characterization scheme is applied to …
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Evaluation of Precast Portland Cement Concrete Panels for Airfield Pavement Repairs
… full-scale airfield PCC test section. Results of accelerated testing indicated that precast panels were suitable for airfield repairs, withstanding between 5,000 and 10,000 passes of C-17 aircraft traffic prior to failure. Failure was due to spalling of the transverse doweled joints. The load …
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Accelerated tests of environmental degradation in composite materials
… Therefore, there is an urgent requirement for accelerated testing of the key components of the environment. A first step to this goal is to identify the components of the environment responsible for the damage. The effects of a realistic moisture and thermal environment on two high temperature …
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Neutron beam monitoring for single-event effects testing
… photodiodes as the detecting elements for accelerated testing of electronics against neutron-induced single event effects (SEEs). The system can measure the transmission along the neutron beam line where several devices are tested simultaneously, allowing beam degradation by upstream …
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In-situ investigation and mitigation of carbon support corrosion of cathode catalyst in PEM fuel cells
… produce CO₂ in different potential ranges. After accelerated testing of cathode catalyst degradation in PEMFC using potential cycling between 100-1400 mV at the rate of 400 mV/s, the changes of mass spectra of CO₂, H₂ and O₂ over time showed that the CSC decreases as Pt electrochemically active …
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Bridging the Gap: Selected Problems in Model Specification, Estimation, and Optimal Design from Reliability and Lifetime Data Analysis
… are proposed for constant amplitude fatigue testing. These test plans are based on a nonlinear physical model from the fatigue literature that is able to better capture the nonlinear behavior of fatigue life and account for effects from the testing environment. Sensitivity to the design …
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Degradation studies on recycled Polyethylene terephthalate
… formulation is really an improvement. So, accelerated testing methods are designed to simulate natural weathering with the combined action of the most weathering damaging factors; UV radiation, oxygen, temperature and water. Whatever the application, there is a concern regarding the …
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