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首页> 外文期刊>Clinical biomechanics >Tolerance of the lumbar spine to shear: A review and recommended exposure limits
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Tolerance of the lumbar spine to shear: A review and recommended exposure limits

机译：腰椎对剪切的耐受性：回顾和建议的暴露极限

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摘要

Background: The lumbar spine may experience significant shear forces during occupational tasks due to the force of gravity acting on the upper body when bending the trunk forward, or when performing tasks involving pushing or pulling. Shear force limits of 1000 N and 500 N have been recommended by previous authors for maximum permissible limit and action limit, respectively. Methods: The present paper reviews literature in terms of shear tolerance (ultimate shear stress and fatigue life in shear stress) of the lumbar spine and develops recommended limits based on results of studies examining shear loading of human motion segments. Weibull analysis was used to assess fatigue failure data to estimate distributions of failure at different percentages of ultimate shear stress. Findings: Based on Weibull analysis of fatigue failure data from the best available data, a 1000 N shear limit would appear acceptable for occasional exposure to shear loading (≤ 100 loadings/day); however, a 700 N limit would appear appropriate for repetitive shear loading (100-1000 loadings/day) for most workers. Interpretation: Results of the current analysis support the 1000 N limit for shear stress, but for a rather limited number of cycles (< 100 per day). Due to the logarithmic nature of the fatigue failure curve, a 700 N shear limit would appear to be acceptable for frequent shear loadings (100-1000 per day). This value is slightly higher than the action limit of 500 N previously recommended.
机译：背景：在腰部脊柱向前弯曲或执行推拉动作时，由于重力作用在上身，因此在职业任务中腰椎可能会承受较大的剪切力。以前的作者已经建议将剪切力极限分别设置为1000 N和500 N，以分别达到最大允许极限和最大作用极限。方法：本文就腰椎的剪切耐受性（最终的剪切应力和剪切应力中的疲劳寿命）方面的文献进行了综述，并根据检查人体运动部分的剪切载荷的研究结果，提出了建议的限值。威布尔分析用于评估疲劳破坏数据，以估计在不同极限剪切应力百分比下的破坏分布。调查结果：根据来自最佳可用数据的疲劳破坏数据的Weibull分析，对于偶尔承受剪切载荷（≤100载荷/天）的1000 N剪切极限似乎是可以接受的;但是，对于大多数工人而言，700 N的极限值似乎适合于反复剪切载荷（100-1000载荷/天）。解释：当前分析的结果支持剪切应力的上限为1000 N，但循环次数却相当有限（每天<100个）。由于疲劳破坏曲线的对数性质，对于频繁的剪切载荷（每天100-1000），700 N的剪切极限似乎是可以接受的。该值略高于先前建议的500 N的动作极限。

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