Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran.
Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran; School of Mechanical & Aerospace Engineering, Kingston University, London, UK.
Comput Biol Med. 2021 May;132:104303. doi: 10.1016/j.compbiomed.2021.104303. Epub 2021 Mar 2.
Little is known about the impact behavior of composite fixation plate used in the fracture healing of long bones diaphysis. Hence, this study examined polypropylene composite fixation plates using different glass fibers and measured their biomechanical responses under axial impact loading experimentally and numerically. Short randomly oriented, long unidirectional prepregs and fiber yarn of glass were considered as reinforcements, and fixation plates were fabricated through two different heat-compressing and 3D printing processes. Furthermore, assessing the fixation plate structures impact behavior was carried out using in vitro impact test and finite element analysis (FEA). Impact damping behavior, damage mechanisms, and stress and strain pattern of the composite fixation plate structures were obtained under various bone fractures and impact energies. The impact load-time responses and the failure mechanisms demonstrated that fixation plate structures with more plastic behavior and lower stiffness could act as an initial shock absorber and dampen the transmission of axial impact load by distributing the impact energy over time. Therefore, considering the ability of stress shielding and adequate interfragmentary movement which amplifies bone ossification, the proposed Glass Fiber/PP (GF/PP) composite fixation plates could serve as a proper alternative in orthopedics.
关于用于长骨骨干骨折愈合的复合固定板的冲击行为知之甚少。因此，本研究通过实验和数值研究了使用不同玻璃纤维的聚丙烯复合固定板，并测量了它们在轴向冲击载荷下的生物力学响应。短切随机取向、长连续单向预浸料和玻璃纤维纱线被认为是增强材料，通过两种不同的热压和 3D 打印工艺制造了固定板。此外，还通过体外冲击试验和有限元分析（FEA）评估了固定板结构的冲击行为。在不同的骨骨折和冲击能量下，获得了复合固定板结构的冲击阻尼行为、破坏机制以及应力和应变模式。冲击载荷-时间响应和失效机制表明，具有更大塑性行为和更低刚度的固定板结构可以作为初始减震器，通过随时间分布冲击能量来减缓轴向冲击载荷的传递。因此，考虑到应力屏蔽的能力和足以促进骨骨化的断端间运动，所提出的玻璃纤维/PP（GF/PP）复合固定板可作为矫形外科的一种合适的替代物。
