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 33 for “"Moisture Absorption"”.
-
Strength Degradation of Gfrp Bars
… The secondary objective was to determine the moisture absorption properties of GFRP bars. The moisture absorption data available is till 80 days from the immersion of the specimens in the tank. The collected data was used in the development of strength retention models. Two strength prediction …
-
Development of bio-composite filaments for drinking straw application
… drinking straw’s functionality of strength and moisture absorption according to standardized material testing protocols. By deriving the mathematical models of these properties as a function of fibre composition, future optimization for production of value-added products will be possible. …
-
Characterization of thermoplastic J1 polymer and its graphite fiber AS4/J1 matrix composites
… and AS4/J1 composites, and (2) the effect of moisture absorption on mechanical properties.
-
Manufacture of and Environmental Effects on Carbon Fiber-Reinforced PhenylEthynyl-Terminated Poly(EtherImide)
… Encouraging results led to a study of moisture sorption effects on CFR 3kPETU properties. The success of these initial studies spawned the large scale production of 2,500 g/mol (2.5k) PETU. Thermal characterization of neat and CFR 2.5kPETU via differential scanning calorimetry, dynamic …
-
Lyocell Fiber-Reinforced Cellulose Ester Composites-Manufacturing Considerations and Properties
… > 15 µ m. The other disadvantages were high moisture absorption during matrix application and void formation during consolidation. Melt processing technique using alternating sandwich structure of fabrics and CAB films produced composites with impressive appearance, low void contents and low …
-
Preparation and Characterization of a Treated Montmorillonite Clay and Epoxy Nanocomposite
… moduli due to the epoxy matrix. The greatest moisture absorption rate was found at 7%, the least at 3%.
-
Processing-Structure-Property Relations in Novel Organocement Composites
… organocement composites. Moisture absorption and transport occurs through the bulk polymer regions; this process combined with further hydration of unreacted cement grains promotes property degradation. Processing constraints prevented complete reduction of the unreacted …
-
Evaluation of the performance of corrugated shipping containers : virgin versus recycled boards
… had the same ring crush values. The effect of moisture absorption rate by materials on the creep rate was investigated also. The results revealed that exposure to the high and cyclic relative humidity conditions used in this study caused significant reduction in compression strength for both …
-
Standardization of test methods for property evaluation of FRP bars
… Long-term tests included evaluation of moisture absorption and flexural tests on aged bars. A total of 229 FRP bars with different fibers (carbon, glass and aramid), varying diameters (# 3 to #8) and surface textures (ribbed, sand-coated, and sand-coated with helical wraps) were tested …
-
Development of low cost thermal insulating materials
… thermal resistance (R-value), combustibility, moisture absorption and the presence of hazardous gases during burning. The temperature comparison test showed that the recycled polymer slab (RPS) and expanded polyethylene foam (EPEF) retards the flow of heat to levels comparable to that of the …
-
Development of a canned whole wheat product
… time on texture, thiamine content and percent moisture were investigated. A minimum safe process was determined. A safe process was calculated to be 9.5 minutes and 11.5 minutes at 121°C (250°F) for Soft Red Winter (SRW) wheat and Kansas Hard Red Winter (HRW) wheat, respectively. The SRW wheat …
-
The Influence of Extended Cure on Mechanical Performance of Aerospace-Grade Film Adhesives
… structures saw less degradation as a result of moisture exposure and elevated temperature testing, while the adhesive with simpler chemical structure exhibited significantly reduced performance at elevated temperature wet conditions. It was concluded that while extended cure exposure did not …
-
Design and evaluation of a grain respiration measurement system for dry matter loss of soybeans
… air input, grain respiration column, and moisture and carbon dioxide absorption columns. The system was tested for maximum loading rates (r_(CO_2)^*), minimum residence times (RT), capacities (A_(H_2 O), A_(CO_2 )) and efficiencies (η_(H_2 O), η_(CO_2 )) of moisture and CO2 absorption …
-
Aging of polymeric composites : a literature review
… matrix reinforced with glass or carbon fibers. Moisture exposure, thermal conditioning, and cyclic loading were the aging mechanisms used to mimic environmental effects. Fatigue, flexural, tensile tests, and scanning electron microscopy were among the many methods used in studies to determine …
-
Development of conductive sheet composite based on kenaf fibre loaded with polyaniline for anti-static packaging application.
… tensile strength, tear test, burst test, water absorption test, DC conductivity, charge decay time, and shielding effectiveness. The modified sheets were suggested to be optimum at 5wt% of PANI coating based on mechanical, physical, and electrical evaluations. The mechanical integrity showed a …
-
Modification of Ternary Nitrate Mixture's Thermal Properties
… to room temperature. In order to minimize the moisture absorption the samples were kept in a sealed desiccator. These hybrid phase change materials were then tested using a differential scanning calorimeter (DSC) through heating and cooling cycles in the range of 0°C to 390°C. The latent heat …
-
Predicting the thermal performance of bio-based cold chain packaging system
… in fiber-based insulation systems, due to moisture absorption that increased effective thermal conductivity. In contrast, polymer-based materials such as expanded polystyrene (EPS) and polyurethane (PU) remained relatively stable. Energy-balance modeling supported these observations, …
-
Physical and mechanical behaviors of pineapple leaf fibre reinforced thermoplastics corn starch bio polymer composites
… by single layer had a significant impact on moisture absorption and water absorption characteristics. In addition, the tests such as soil burial and water solubility were also affected by the fibre loading. Next, the PALF length affected the physical and mechanical behaviours of PALE/TPCS …
-
Assessment of brown-rot decay using X-ray computer tomography and ultrasonic measurements
… was difficult to evaluate because of initial moisture absorption, these results indicate that x-ray CT can detect decay in wood specimens exposed to only one week of controlled decay using density measurements. For each of the three principal material directions of these specimens with …
-
The Effect of Salt Splash on Nylon 6,6
One of the most common environmental exposures that nylon undergoes, when used for automotive applications, is that of salt splash, which commonly occurs during winter driving. This study looks at the effect of various salts (NaCl, KCl, CaCl2) on the thermal and mechanical properties of nylon when …
Page 1 of 2