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href="/127syzg/">127xaL</a></li> <li><a href="/114syzg/">114xaL</a></li> <li><a href="/89syzg/">89xaL</a></li> <li><a href="/102syzg/">102xaL</a></li> </ul> </div> <div class="inSide"> <div class="inTit fs16 font_w">联系我们</div> <div class="inContact"> <img src="/template/NEST60006/images/contact.jpg" /> <span class="db fs14 col_6 fb">Ȯ阳市中泰石沚wh限公?/span> <p>联系人:张经? 18238395888</p> <p>?nbsp;   话:18238395888</p> <p>?nbsp;   真:</p> <p>?nbsp;   址Q河南省Ȯ阳市北环\开发区</p> </div> </div> </div> <div class="inRight fr mt15"> <div class="inProTit"> <span class="fl"><b>新闻详细</b></span> <em class="fr"><a href="/">首页</a> > <a href="/news/">新闻信息</a> > 详细内容 </em> </div> <div class="content"> <div class="news_arc"> <h1>xaL的常见损?/h1> <h2>发布旉Q?020-09-14</h2> <h2>来源Q?a href='http://www.bjedin.com/news/326.html'>http://www.bjedin.com/news/326.html</a></h2> <h3>  W一Q振动和弯曲损?br />   当钻pC界速度ӞL会发生振动,q往往会导致钻杆弯曌Ӏ过度磨损、快速损坏和疲劳失效。特别是L的两U振?节点振动和弹摆振动)重合Ӟ最不利。界速度随钻L长度、尺寸、接尺寸和d寸而变化?br />   W二Q拉伸失效?br /> <p>   Lq程中经常发生拉伸失效。当提升张力过屈服ҎQ钻杆壁的最薄弱部位或最截面会出现“细颈”变形。如果提升力过刚才的极限强度,L׃断裂。拉伸失效通常发生在钻q上部。因Z部钻h要承受压力,又要承受L重量?</p> <p style="text-align:center;"> <img src="/uploads/image/20200914/20200914151852_9545.jpg" alt="xaL" width="500" height="313" title="xaL" align="" /> </p>   W三Q疲x坏?br /> <p>   疲劳失效是钻杆最常见的失效Ş式。钻杆应承受拉、压~、扭转和弯曲的周期性应力。张力和弯曲是最危险的应力。目前钻杆疲力_效的主要原因是钻杆在弯曲孔中旋{时生的周期性应力。在弯曲的钻孔中Q即佉K铤有_的厚度,仍可能发生疲劳破坏,破坏的位|也不一定。当L弯曲ӞL旋{一ơ,相应位置会因反复拉和压~而生周期性应力。靠q钻铤的L最Ҏ弯曲Q因为钻铤刚度较大,能抗弯曲Q钻铤上方的L会发生弯曌Ӏ?</p> <p style="text-align:center;"> <img src="/uploads/image/20200914/20200914151927_8915.jpg" alt="xaL" width="500" height="335" title="xaL" align="" /> </p>   同时Q钻杆上的最大应力出现在L加厚部分的端部,距离接头U?0厘米。如上所qͼ接头不可能弯Ԍ弯曲只能发生在管壁较薄的L体上。在横截面变化的位置Qv到虎钳一L固定作用Q其成为弯曲力的支炏V如果钻杆在其整个长度上均匀弯曲Q作用在L上的应力变低,疲劳失效的应力@环次数将增加?br /></h3> <p><a href="http://www.bjedin.com">xaL</a><font color="red">,</font><a href="http://www.bjedin.com">q口L</a><font color="red">,</font><a href="http://www.bjedin.com">地质L生厂家</a>-<a href="http://www.bjedin.com">Ȯ阳中泰xad</a></p> 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