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doi:10.13228/j.boyuan.issn1001-0777.20150017

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Abstract��To solve the fracture and failure problem of hexagon bolt and bolt in washer assembly equipped in some vehicle model at bench test�� the bolt fracture reason we analyzed by using scanning electron microscopy (SEM)�� metallographic examination�� mechanical properties test�� chemical composition analysis�� friction coefficient test. Results showed the fracture property of bolt was fatigue fracture mainly because the washer hardness in the assembly is too low and plastic deformation under pre-tightening torque leads to insufficient bolt pre-tightening force and final bolt fatigue fracture.

Key words�� bolt and washer assemblies�� bench test��fatigue��preload

�ո��: 2015-04-02 ��: 2015-12-02

ͨѶ��: ��ΰ E-mail: chw_jiang@163.com

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��ΰ�� 壬 ��農�� ã� �� ƽ�� . ��˨�͵�Ȧ��ϼ�ʧЧ��[J]. �й��ڿ��, 2015, 33(6): 31-35. JIANG Chun-wei�� CHEN Qi-feng �� ZHU Ling-jing��LING Ting�� WANG Ping��WANG Hui. Failure analysis of automobile bolt and washer assembly. Chinese Journal of Iron and Steel, 2015, 33(6): 31-35.

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http://gt.chinamet.cn/Jweb_wlcs/CN/10.13228/j.boyuan.issn1001-0777.20150017 �� http://gt.chinamet.cn/Jweb_wlcs/CN/Y2015/V33/I6/31