Based on the results obtained, they presented a prediction process of delamination shape for composite laminates under low-velocity impact. established a damage analysis process of composite laminates subjected to low-velocity impact by building numerical models on a damage model where cohesive contact method was involved according to the experimental observation. In reference, they also verified their mode of interply hybrid composites based on woven fabrics and polymerized cyclic butylene terephthalate resin subjected to low-velocity impact. built a 3-D finite element model (FEM) to investigate the high-velocity impact response of fiber-metal laminates (FMLs) using ABAQUS/Explicit platform the results showed that the effect of fiber stacking sequence on the impact performance of FMLs is very limited under critical penetration velocity, and the damage pattern depends on the projectile incident angle. Therefore, it is valuable to study the impact response of fiber-reinforced composite laminates.Ĭonsiderable effort has been made in analyzing the damage modes and the impact response of composite materials. This internal damage will greatly influence the material’s mechanical properties and lead to the decline of the material bearing capacity. Obvious damage may not be found on the surface under low-velocity impacts, although the composite laminates may suffer internal delamination damage. Composite materials will inevitably face unexpected collisions during use. Research on composite materials damage under high-velocity impact has theoretical and practical significance for military preparedness. The results of different geometric shapes show that the damage area of the adhesive layer and the displacement of the center of the laminated plates are largest for a conical impactor and smallest for a flat impactor.Īs a kind of lightweight material, composite materials are widely used in bulletproof and aerospace fields. Under a low-velocity impact, the maximum contact force, damage area of the adhesive layer, and displacement of the center of the laminated plate increase as the impact energy increases, thus showing that impact energy is not directly related to contact duration and energy absorption of composite laminates. Moreover, the target energy absorption decreases with increasing layer angle. The results show that the energy absorption of composite laminates increases with impact velocity, and specific energy absorption changes with the density of the contact surface, which is affected by ply thickness. Additionally, the role of impact or shape, including hemispherical, flat, and conical, on the damage area of the adhesive layer and displacement of the center of the laminated plates was investigated. Wear your everyday shoes to your appointment so your doctor can look at the wear patterns on the soles.The effects of units, material parameters, and constitutive relationships on the dynamic mechanical response of composite laminates subjected to high- and low-velocity impacts were investigated. If your feet cause you significant pain, your family doctor may refer you to a doctor specializing in foot disorders (podiatrist) or sports medicine. Losing weight can reduce stress on your feet.
Over-the-counter pain relievers might help. Over-the-counter arch supports might increase your comfort. Participate in low-impact activities - such as walking, biking or swimming - rather than jumping and running activities. Avoid activities that aggravate your condition. If your flatfeet cause you minor pain, you might want to try: Request an Appointment at Mayo Clinic Lifestyle and home remedies However, you might have surgery for an associated problem, such as a tendon tear or rupture. Surgery isn't done solely to correct flatfeet. A physical therapist can do a video analysis of how you run to help you improve your form and technique. Flatfeet may contribute to overuse injuries in some runners. A structurally supportive shoe might be more comfortable than sandals or shoes with minimal support. Exercises to stretch this tendon may help. Some people with flatfeet also have a shortened Achilles tendon. Arch supports won't cure flatfeet, but they often reduce symptoms. Or your doctor might suggest custom-designed arch supports, which are molded to the contours of your feet. Over-the-counter arch supports may help relieve the pain caused by flatfeet.
If your flatfeet are painful, your doctor might suggest: No treatment is necessary for flatfeet if they don't cause pain.
0 kommentar(er)
