Strength Loss of Wire Rope Over Stationary Sheaves or Pins<\/h3>\n
Rope breaking strength is determined in a standard test wherein fittings are attached to the ends of the rope and the rope is pulled in a straight line.<\/span><\/p>\nIf, however, the rope passes over a curved surface (such as a sheave or pin) its strength “is decreased.” The amount of such reduction will depend on the severity of the bend as expressed by the D\/d ratio. For example, a rope bent around a pin of its own diameter will have only 50% of the strength attributed to it in the standard test. This is called “50% efficiency” (Fig. 38). Even at D\/d ratios of 40, there may be a loss of up to 5%. At smaller D\/d ratios, the loss in strength increases quite rapidly.<\/span><\/p>\nThe angle of bend need not be 180\u00ba, 90\u00ba, or even 45\u00ba; relatively small bends can cause considerable loss.<\/span><\/p>\nAll discussion of strength pre-supposes a gradually applied load not to exceed one inch per minute.<\/span><\/p>\n<\/div><\/div><\/div><\/div><\/div><\/div><\/p>\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":[79],"tags":[],"class_list":["post-560","post","type-post","status-publish","format-standard","hentry","category-c91-misc"],"_links":{"self":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/560","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=560"}],"version-history":[{"count":0,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/560\/revisions"}],"wp:attachment":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/media?parent=560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/categories?post=560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/tags?post=560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![](\"http:\/\/wirerope.net\/azwr\/wp-content\/uploads\/powerpoint-1.jpg\")
<\/a><\/span><\/div><\/div>![](\"http:\/\/wirerope.net\/azwr\/wp-content\/uploads\/powerpoint-3.jpg\")
<\/a><\/span><\/div><\/div>