共查询到18条相似文献,搜索用时 46 毫秒
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通过宏观检查并结合体式显微镜SM、直读光谱仪OES、金相显微镜OM、扫描电子显微镜SEM等检测分析仪器,对一条断裂的塔式起重机钢丝绳进行失效分析。结果表明:钢丝绳上存在大量陈旧断口,同时在钢丝绳上发现了不同程度的挤压磨损。这些损伤的存在造成整条钢丝绳的承载力严重下降,在使用过程中,剩余钢丝不足以承受所加载荷,最终发生断裂。建议在以后的起吊作业过程中,定期对钢丝绳进行检查,及时更换不满足使用要求的钢丝绳;钢丝绳使用过程中采取合理的润滑方法进行维护;钢丝绳在保存或者转运过程中,应避免损伤。 相似文献
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某工地一台塔式起重机因起升钢丝绳发生断裂,造成人员伤亡事故。对现场截取的断裂钢丝绳进行结构、材质分析以及采用表观检测、力学性能检测、断口分析相结合的方法进行钢丝绳失效分析。检测分析结果显示事故现场断裂的钢丝绳结构为6×37+FC,属于一般用途钢丝绳。钢丝绳中的钢丝发生了不同程度的锈蚀,尤其是各股外层钢丝均发生了严重锈蚀;钢丝绳中各股外层钢丝都有不同程度的磨损,甚至有钢丝出现磨损断裂;严重锈蚀和严重磨损大大降低钢丝抗拉强度。综合分析表明钢丝绳选用不当以及使用过程中对钢丝绳保养维护和检查不到位是造成钢丝绳断裂的主要原因。 相似文献
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本文简要介绍了钢丝绳中所产生的主要着比形式及检验的要求、为了对目测加以改进试用了各种检验技术;并对其中最成功的技术即磁力检验,进行了介绍并给出了成功的应用实例。概述钢丝绳属于复杂的动态元件,其应用范围极广,如:矿山卷场机、提升机、吊车和绞车。钢丝绳通常为单线元件,因此被列为安全临界元件。从而,钢丝绳在其使用寿命中必须接受某种检验和最终报废/更换程序。这种程序的核心是检测并辨别出钢丝绳中的老化情况的能力。某些形式的无损检验(NDT)是很有用的。目测是最显而易见的,但它有几个缺点;如:老化有可能发生… 相似文献
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FE analysis of frictional contact effect for laying wire rope 总被引:1,自引:0,他引:1
Contact model formulated with variational equalities, has been presented for laying wire rope in this paper. For the contact searching procedure, the splitting-pinball algorithm from which the user can be spared from guessing the types of contact that may occur, have been described. Taking the friction contact into account, the Augmented Lagrangian method has been applied to calculate the contact force. FE simulation of a simple wire strand has been given. And the effects of friction coefficient and self-rotating ratio on the contact stress and on the forming stress and strain have been analyzed. Also the stability, efficiency and precision of the numerical simulation are discussed. For the residual stress of helical wire in the end of laying process, the computed results with nonzero friction coefficient are in better agreement with the experimental results than those without friction. 相似文献
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The possibility of solving the problems encountered in the quantitative inspection of broken wires with a neural network is discussed and a new algorithm is presented. In comparison with conventional methods, the performance of inspection is much improved with the neural network-based technique. 相似文献
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K. K. Schrems C. P. Dogan J. A. Hawk 《Journal of Materials Engineering and Performance》1995,4(2):136-144
A nonrotating wire rope used in mine hoist operations is being examined by the U.S. Bureau of Mines to determine operative
wear mechanisms. Typically, bending and loading the ropes during service cause small, localized movements at interwire contacts,
leading to material loss through wear: The cumulative effect of both material loss by wear and wire breakage by fatigue failure
accelerates rope retirement. If the macroscopic mechanics of wire rope failure are to be understood, microscopic deformation
and degradation processes must be identified and quantified. As a first step in this study, interwire wear and deformation
were studied using a combination of scanning electron microscopy and hardness measurements. Both fretting and abrasive wear
were identified as wear mechanisms. Preferential sites for fretting and abrasive wear were identified and are discussed regarding
rope construction and geometry and the tribo-system. 相似文献
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用金相和扫描电镜分析了钢丝杯锥状断口。结果表明,钢丝杯锥状断口形成机理主要是由于钢丝组织中存在夹杂物、组织疏松、碳偏析以及拉拔工艺不当,导致心部出现"V"型裂纹,沿"V"型裂纹断裂后形成杯锥状断口。 相似文献