Publications by authors named "Kazumasa Shimamoto"
In this study, we used near-infrared spectroscopy to measure the moisture penetration in epoxy adhesives and investigated the difference in the diffusion coefficients between the bulk and the adhesive layer. Moisture diffusion was evaluated under 100% RH and water immersion conditions. First, the effects of the curing agents and additives on moisture diffusion in the bulk were gravimetrically evaluated using epoxy-coated quartz glass plates.
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- The study aimed to create a mathematical equation to describe how adhesive strength changes with temperature, considering various factors.
- Tests were conducted on adhesive materials across a temperature range from -60 °C to 135 °C using tensile, fatigue, and creep methods, revealing a clear temperature-strength relationship.
- Results indicate that adhesive strength decreases with temperature in an exponential manner, and the fatigue test showed a higher temperature threshold for strength loss compared to static tests.
Article Synopsis
- Stabilization techniques for n-doped carbon nanotubes (CNTs) are crucial for the functionality of CNT devices, but existing n-dopants lack durability in real-world settings.
- A new method is introduced that enhances air stability of n-doped CNT films by fully encasing them in n-dopants, although exposure to scratches or moisture can compromise this stability.
- The study also highlights the use of parylene as a protective layer, achieving over a year of air stability, while demonstrating superior thermo-electric power generation capabilities compared to traditional n-dopants, paving the way for broader applications of CNT technology.
Article Synopsis
- - The study used a double cantilever beam test method in a temperature-controlled water environment to examine how creep loads affect energy release rates (ERR) in epoxy-bonded aluminum alloys, demonstrating that only one measurement is needed for ERR calculations.
- - Results showed that while initial load and spring constant didn't influence ERR thresholds, increasing immersion temperatures significantly decreased the ERR threshold, although it stayed above 15% of static test values.
- - The research also identified three distinct phases of creep crack growth in adhesive joints influenced by temperature, highlighting the test method's potential for studying the long-term durability of adhesive joints in varying conditions.