Impact resistance parameters of composite cylinder?5 answersThe impact resistance parameters of composite cylinders include impact energy absorption rate, delamination extension resistance, and residual strength ratio attenuation factor. Additionally, three-dimensional woven composites exhibit superior impact resistance due to through-thickness reinforcement, offering enhanced fracture toughness, fatigue life, and damage tolerance. Nanocomposites with inorganic nanoparticles show improved impact and ballistic resistance, enhancing tensile strength, toughness, and impact toughness while reducing deformation depths after shots and knife stab energy absorption. Furthermore, thin-walled carbon fiber reinforced epoxy composite cylinders demonstrate varying impact resistance based on stacking sequences, with [553/-553/55/-55/0/90] being more resistant to impact. Overall, these studies emphasize the importance of considering material composition, structure, and reinforcement in optimizing the impact resistance of composite cylinders.
What is variable to determine impact resistance of composite material under low velocity impact?4 answersThe variables that determine the impact resistance of composite materials under low-velocity impact include the impactor's nose shape, impactor velocity, impact energy levels, dent depth, and the configuration of the composite laminate. Studies have shown that the resistance of composite laminates can be influenced by factors such as the shape of the impactor, the energy of impact, and the material composition. Additionally, the behavior of the composite material under impact can be affected by the presence of aluminum sheets, which may prevent damage to fibers but can lead to delamination and fractures between layers. Furthermore, the resistance formula of the composite material can be influenced by discrete and abstract variables treated as continuous integer variables.
What does force-displacement curve obtained from low velocity impact test refer to?5 answersThe force-displacement curve obtained from a low-velocity impact test refers to the relationship between the applied force and the resulting displacement during impact testing. This curve is crucial in understanding the behavior of structures subjected to low-velocity impacts, such as composite laminates and aluminum plates, as it provides insights into impact resistance, damage tolerance, and structural integrity. The curve helps in analyzing the transient impact force, local deformation at the point of contact, and the structural response of the target material. By studying this curve, researchers can assess the material's ability to withstand impact loads, predict failure modes, and optimize designs to enhance impact performance.
What is effect of energy absorption and impact resistance of composite ?5 answersThe addition of shape memory wires and stainless-steel wires in composite materials improves their impact resistance properties and energy absorption capability. Arapaima scale-reinforced epoxy composites show increased impact resistance and energy absorption with higher volume fractions of scales. Hybrid composites consisting of Kevlar, carbon, and glass exhibit varying levels of impact energy absorption, with Kevlar/epoxy and Kevlar/glass/epoxy composites showing the highest absorption. Composite double-layer honeycomb sandwich structures with smaller cell diameters and thicker walls have enhanced energy absorption rates. Hybrid composite nozzles with a carbon/glass/glass stacking sequence demonstrate higher impact resistance compared to other laminates.
How to conduct composite reliability measurement?5 answersComposite reliability measurement can be conducted using various methods. One approach is to use a latent variable modeling approach, which involves examining measurement and reliability invariance and combining scale reliability coefficients across studies when these invariance conditions hold. Another method is to establish a mathematic model of the power communication fiber network and collect data on effectiveness, fiber attenuation, bandwidth, time delay, packet loss, and cost from operation data of an existing network. This data is used to evaluate the reliability and service transmission performance of the network. Additionally, a methodology called Composite System based Multi-Area Reliability Model can be used to evaluate the reliability of interconnected power systems. This method considers the entire composite system in detail, allowing for a more accurate modeling of the transmission system.
How can I analyse the low velocity impact on structure?5 answersTo analyze low velocity impact on structures, finite element analysis can be used. This method allows for the determination of maximum energy absorption and damage modes in different types of sandwich structures. The impact resistance of the structure can be improved by modifying the design, such as changing the wall thickness distribution of the cores or moving the inner panel. Additionally, the type and thickness of the cores and facesheets, as well as interfacial reinforcement techniques, can influence the impact load and energy absorption of the sandwich structure. Delamination is a common type of impact damage in facesheets, and its behavior is dependent on the type of facesheet used. It is also important to consider the role of fluid structure interaction when analyzing low velocity impact on composite materials, especially in marine applications.