Estimation of the Remaining Sterength of Locally Corroded P.W.S. Ropes.

局部腐蚀 P.W.S. 剩余强度的估计

• 批准号: 61550466
• 负责人: HANASAKI Koichi
• 金额: $ 1.15万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1988
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550466/
• 关键词: Wire rope; Electromagnetic inspection; Strength; Nondestructive testing; 曲げ疲労試験; 平行線ロープ; シミュレーション; 引張試験

A method to estimate the remaining strength of locally corroded P.W.S. ropes was developed. In this method, the degree of corrosion first evaluated in terms of the loss of cross-sectional area by magnetic inspection. Second, the remaining strength is estimated from the area loss by a numerical simulation of the load-elongation behaviour of the corroded P.W.S. With this method the remaining strength was considerably lower than expected from the area loss, because the P.W.S. consists of wires corroded to various degrees. To verify the validity of this method, bundles of partially thinned wires were examined as a model of locally corroded P.W.S. The area loss and the strength for these specimens were in good agreement with the actual values. The method was then used to evaluated the degree of deterioration of P.W.S.75 ropes that had been seriously corroded during 15 year's exposure to weather as suspension members of roofing. Two P.W.S.75's were removed from the roofing for replacement and then subjected to tensile test. The remaining strength of those ropes was successfully predicted by this method.

提出了一种估算局部腐蚀P.W.S.缆绳剩余强度的方法。在这种方法中，腐蚀程度首先根据磁性检查的横截面积损失来评估。其次，通过对腐蚀P.W.S.的载荷-伸长行为进行数值模拟，根据面积损失估算剩余强度。由于P.W.S.由不同程度腐蚀的电线组成，因此这种方法的剩余强度大大低于面积损失的预期。为了验证该方法的有效性，将部分变细的钢丝束作为局部腐蚀的P.W.S.模型进行了试验，所得的面积损失和强度与实际值吻合较好。然后使用该方法评估作为屋顶悬挂构件的pw.s. 75绳索在15年的天气暴露中严重腐蚀的恶化程度。从屋顶上拆下两个pws - 75进行更换，然后进行拉伸试验。用这种方法成功地预测了这些绳索的剩余强度。

项目成果

塚田和彦, 花崎紘一, 藤中雄三: 日本鉱業会誌.

Kazuhiko Tsukada、Koichi Hanasaki、Yuzo Fujinaka：日本矿业协会杂志。