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首页> 外文会议>ASME Pressure Vessels Piping Conference;High-Pressure Technology Student Paper Symposium and Competition;Annual Student Paper Competition Conference;Rudy Scavuzzo Student Paper Symposium;ASME Nondestructive Evaluation, Diagnosis and Prognosis Division >THE EFFECT OF PEDICLE SCREW THREAD SHAPE ON THE STRESS CONCENTRATION UNDER LATERAL BENDING
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THE EFFECT OF PEDICLE SCREW THREAD SHAPE ON THE STRESS CONCENTRATION UNDER LATERAL BENDING

机译：侧向弯曲下旋扭螺纹形状对应力集中的影响

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摘要

Pedicle screws (PS) are frequently used in medical spinal column fixation. Despite 7 out of 100 pedicle screws fracture inside of the patients' body and under the claim that lateral bending is the main failure mode, little research has addressed the stress characteristics and the fracture location of the PS under lateral bending. This study focuses on the effect of thread design on the magnitude and location of maximum stress concentration. Four types of thread shapes are considered including V-shape, square-shape, buttress, and reverse buttress. Three-dimensional (3D) finite element (FE) methods are used in this investigation. A load of 150 Newton is applied at the screw head to simulate lateral bending. The models are created in SolidWorks. The 3D FE analysis is performed using the standard coding of ANSYS Workbench 19.1. Based on this study, it is found that the high stress concentration is located at the cortical bone region rather than at the cancellous bone region. Although the general stress patterns are similar, the PS thread shape design and the thread fillet radius may significantly affect on the magnitude and location of maximum stress concentration.
机译：椎弓根螺钉（PS）常用于医疗脊柱固定。尽管患者体内每100个椎弓根螺钉中有7个骨折，并且声称横向弯曲是主要的​​破坏方式，但很少有研究针对横向弯曲下PS的应力特征和骨折部位。这项研究的重点是螺纹设计对最大应力集中的大小和位置的影响。考虑四种类型的螺纹形状，包括V形，方形，支撑和反向支撑。在这项研究中使用了三维（3D）有限元（FE）方法。在螺钉头上施加150牛顿的载荷以模拟横向弯曲。模型是在SolidWorks中创建的。使用ANSYS Workbench 19.1的标准编码执行3D FE分析。根据这项研究，发现高应力集中位于皮质骨区域而不是松质骨区域。尽管总体应力模式相似，但PS螺纹形状设计和螺纹圆角半径可能会极大影响最大应力集中的大小和位置。

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