Browsing by Author "Srewaradachpisal S."

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    Effects of orientation and density of thermoplastic polyurethane honeycomb print on impact response in footwear and absorption applications
    (2024-03-01) Srewaradachpisal S.; Chatpun S.; Nouman M.; Thongruang W.; Srewaradachpisal S.; Mahidol University
    This study examined how 3D printing might increase impact force reduction in footwear application. The study used 3D honeycomb constructions of thermoplastic polyurethane to show how print orientation and density affect footwear's sensitivity to impact energy. Thorough characterization and standardized testing were used to analyze 3D-printed honeycomb lattice mechanical properties. This showed that construction orientation and density affect stiffness and elasticity. The fundamental investigation in this study revolved around the crucial relationship between construction orientation and density, which affects impact force dissipation. The transverse structure exhibited the highest impact reduction efficiency of 0.75 in our analysis, whereas the alternative structures only managed 0.65. Conversely, the impact reduction was significantly more influenced by the appropriate structural density than by the orientation angle. Impact mitigation and absorption applications can be better accommodated through the use of 3D honeycomb TPU printing, which enables manufacturers to create comfortable protection.
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    The Effect of Customized Insole Pads on Plantar Pressure Distribution in a Diabetic Foot with Neuropathy: Material and Design Study Using Finite Element Analysis Approach
    (2023-01-01) Nouman M.; Chong D.Y.R.; Srewaradachpisal S.; Chatpun S.; Mahidol University
    To reduce the trial and error in a real clinical scenario, the finite element analysis (FEA) can be effectively used to simulate various effective pad designs and a material selection to reduce and redistribute peak plantar pressure in a diabetic foot with neuropathy. The aim of this study was to investigate the effect of pad design and material stiffness on the reduction in plantar pressure in a diabetic foot with neuropathy using FEA. Three-dimensional foot models with a customized insole (CMI) were created to study the peak contact pressure. Ethylene vinyl acetate, Nora® Lunalastike, and thermoplastic polyurethane were assigned to the top, middle, and base layers of the CMI, respectively. Two types of pads were proposed: a heel pad and a heel–forefoot pad. Four different materials with different stiffnesses were assigned as pad materials including a void pad. The FEA revealed that pads with soft materials reduced peak plantar pressure more effectively than stiffer pads. The use of a softer heel–forefoot pad reduced the peak plantar pressure at the midfoot and forefoot compared with other pads. The findings suggest that the material and design selection for the fabrication of CMIs with pads are important factors in reducing plantar pressure and may be useful in the management of a neuropathic diabetic foot.