Enhancement of seal life through carbon composite back-up rings under shock loading conditions in defence applications

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• 作者：Shankar Bhaumikup>aup> ; A. Kumaraswamyup>bup>up> ; up>up>akswamy@diat.ac.in" class="auth_mail" title="E-mail the corresponding authorup>up> ; up>up>adepu_kswamy@yahoo.com" class="auth_mail" title="E-mail the corresponding authorup> ; S. Guruprasadup>aup>
• 关键词：Hydraulic seal ; O-rings ; Shock load ; Seal extrusion ; Pneumo-hydraulic shock absorber ; Back-up rings
• 刊名：Defence Technology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：12
• 期：1
• 页码：39-45
• 全文大小：1936 K

文摘

The life of Nitrile Butadiene Rubber (NBR) O-ring seal having shore hardness of A70 and A90 under shock loading conditions was investigated by a specially designed pneumo-hydraulic shock test rig. Shock tests have been carried out on bare seals, seal with conventional polytetrafluoroethylene (PTFE) back-up rings and seal with newly developed carbon composite back-up rings to study its behaviour under different operating conditions until failure. Experiments were conducted by varying annular gap ranging from 0.3 to 0.5 mm, oil temperature from 30 °C to 70 °C and rate of pressure rise from 600 to 2400 MPa/s. Significant enhancement in seal life was observed with carbon composite back-up ring at reduced annular clearances compared to seal life with conventional PTFE back-up ring and without back-up rings.