{"id":316,"date":"2011-10-11T03:33:54","date_gmt":"2011-10-11T03:33:54","guid":{"rendered":"http:\/\/wirerope.net\/2015\/2011\/10\/11\/degradation\/"},"modified":"2019-08-09T22:59:07","modified_gmt":"2019-08-09T22:59:07","slug":"degradation","status":"publish","type":"post","link":"https:\/\/wirerope.net\/azwr\/degradation\/","title":{"rendered":"Degradation"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-one-full fusion-column-first fusion-column-last\" style=\"--awb-bg-size:cover;--awb-margin-bottom:0px;\"><div class=\"fusion-column-wrapper fusion-flex-column-wrapper-legacy\"><div class=\"fusion-text fusion-text-1\"><p><strong>Table 15.<\/strong> Diagnostic Guide to Common Wire Rope Degradation<\/p>\n<\/div>\n<table border=\"1\" width=\"100%\" cellspacing=\"0\" cellpadding=\"10\" align=\"left\">\n<thead>\n<tr>\n<th colspan=\"1\" align=\"left\" valign=\"middle\" bgcolor=\"#000000\"><span style=\"color: #ffffff;\">Mode<\/span><\/th>\n<th colspan=\"1\" align=\"left\" valign=\"middle\" bgcolor=\"#000000\"><span style=\"color: #ffffff;\">Symptoms<\/span><\/th>\n<th colspan=\"1\" align=\"left\" valign=\"middle\" bgcolor=\"#000000\"><span style=\"color: #ffffff;\">Possible Causes<\/span><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th align=\"left\">Fatigue<\/th>\n<th align=\"left\">Wire break is transverse &#8211; either straight across or Z shape.\u00a0 Broken ends will appear grainy.<\/th>\n<th align=\"left\">Check for rope bent around too small a radius; vibration or whipping; wobbly sheaves; rollers too small; reverse b ends; bent shafts; tight grooves; corrosion; small drums &amp; sheaves; incorrect rope construction; improper installation; poor end terminations. (In the absence of other modes of degradation, all rope will eventually fail in fatigue.)<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Tension<\/th>\n<th align=\"left\">Wire break reveals a mixture of cup and cone fracture and shear breaks.<\/th>\n<th align=\"left\">Check for overloads; sticky, grabby clutches; jerky conditions, loose bearing on drum; fast starts, fast stops, broken sheave flange; wrong rope size &amp; grade; poor end terminations. Check for too great a strain on rope after factors of degradation have weakened it.<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Abrasion<\/th>\n<th align=\"left\">Wire break mainly displays outer wires worn smooth to knife edge thinness. Wire broken by abrasion in combination with another factor will show a combination break.<\/th>\n<th align=\"left\">Check for change in rope or sheave size; change in load; overburden change; frozen or stuck sheaves; soft rollers, sheaves or drums; excessive fleet angle; misalignment of sheaves; kinds; improperly attached fittings; grit &amp; sand; objects imbedded in rope; improper grooving.<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Abrasion plus Fatigue<\/th>\n<th align=\"left\">Reduced cross-section if broken off square thereby producing a chisel shape.<\/th>\n<th align=\"left\">A long term condition normal to the operating process.<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Abrasion plus Tension<\/th>\n<th align=\"left\">Reduced cross-section is necked down as in a cup and cone configuration. Tensile break produces a chisel shape.<\/th>\n<th align=\"left\">A long term condition normal to the operating process.<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Cut or Gouged or Rough Wire<\/th>\n<th align=\"left\">Wire ends are pinched down, mashed and\/or cut in a rough diagonal shear-like manner.<\/th>\n<th align=\"left\">Check on all above conditions for mechanical abuse, or either abnormal or accidental forces during installation.<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Torsion or Twisting<\/th>\n<th align=\"left\">Wire ends show evidence of twist and\/or cork-screw effect.<\/th>\n<th align=\"left\">Check on all above conditions for mechanical abuse, or either abnormal or accidental forces during installation.<\/th>\n<\/tr>\n<tr>\n<th align=\"left\">Mashing<\/th>\n<th align=\"left\">Wires are flattened and spread at broken ends.<\/th>\n<th align=\"left\">Check on all above conditions for mechanical abuse, or either abnormal or accidental forces during installation. (This is a common occurrence on the drum.)<\/th>\n<\/tr>\n<\/tbody>\n<\/table>\n<div class=\"fusion-clearfix\"><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[57],"tags":[],"class_list":["post-316","post","type-post","status-publish","format-standard","hentry","category-c34-wire-rope"],"_links":{"self":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/316","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/comments?post=316"}],"version-history":[{"count":0,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/316\/revisions"}],"wp:attachment":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/media?parent=316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/categories?post=316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/tags?post=316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}