| 制动器拉杆螺杆断裂分析 |
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| 引用本文： | 程琴,曾蓉,刘德林.制动器拉杆螺杆断裂分析[J].失效分析与预防,2015,10(1):47-50. |
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| 作者姓名： | 程琴 曾蓉 刘德林 |
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| 作者单位： | 1. 北京航空材料研究院, 北京 100095; |
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| 摘 要： | 车辆制动器经维修反复拆装后发现拉杆部件的螺杆发生断裂。通过断口宏微观观察、金相和显微硬度检测等方法,并根据金相检查结果进行热模拟试验,确定了45钢制动器拉杆螺杆的断裂性质,分析了制动器拉杆螺杆断裂失效的原因。研究结果表明:制动器拉杆螺杆的断裂性质为过载断裂,未进行调质处理导致材料强度低、韧性差,加上在服役过程中可能受到异常的弯曲和冲击载荷复合作用,导致螺母与螺杆的交接处发生断裂。建议严格按照螺杆的热处理工艺规程,提升螺杆的强度和韧性。
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| 关 键 词： | 制动器拉杆螺杆 45钢 过载断裂 应力集中 调质处理 |
| 收稿时间： | 2014-11-14 |
Fracture Analysis on Screw of Brake Drag Link |
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| CHENG Qin,ZENG Rong,LIU De-lin.Fracture Analysis on Screw of Brake Drag Link[J].Failure Analysis and Prevention,2015,10(1):47-50. |
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| Authors: | CHENG Qin ZENG Rong LIU De-lin |
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| Affiliation: | CHENG Qin;ZENG Rong;LIU De-lin;Beijing Institute of Aeronautical Materials;Beijing Key Laboratory of Aeronautical Materials Testing and Evaluation;AVIC Failure Analysis Center;Department of Materials and Chemical Engineering Pingxiang University; |
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| Abstract: | A screw of the brake drag link of a car was found to have broken after repeated dismounting. The failure cause of the screw was analyzed by macroscopic and microscopic examination of fracture surface, metallographic examination, microhardness testing, and thermal simulation testing. The results show that the failure mode of the crew is over-loading fracture. Without modified treatment, the strength of the material and the toughness was poor. Besides, the screw might have experienced the coeffect of abnormal impact load and flexural load during service. As a result, the screw fractured at the joint of nut and screw. Strict heat treatment processing should be carried out to improve the strength and toughness of the material. |
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| Keywords: | screw of brake drag link 45 steel overloading fracture stress concentration modified treatment |
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