{"id":311,"date":"2011-10-11T02:48:36","date_gmt":"2011-10-11T02:48:36","guid":{"rendered":"http:\/\/wirerope.net\/2015\/2011\/10\/11\/bendingfactors\/"},"modified":"2022-06-20T17:55:31","modified_gmt":"2022-06-20T17:55:31","slug":"bendingfactors","status":"publish","type":"post","link":"https:\/\/wirerope.net\/azwr\/bendingfactors\/","title":{"rendered":"Bending Factors"},"content":{"rendered":"

If a change in construction is being considered as a means of obtaining longer service on a rope influenced principally by bending stresses, the table of factors may be useful. For example: a change from a 6 x 25 FW with a factor of 1.00 to a 6 x 36 WS with a factor of 1.5 would mean the service life could be expected to increase 1.15 times or 15%.<\/p>\n

It must be pointed out, however, that these factors apply only for bending stresses. Other factors which may contribute to rope deterioration have not been considered.<\/p>\n<\/div>

<\/div><\/div><\/div><\/div><\/div>
<\/div><\/div>
\n
\n\n\n\n\n\n\n\n\n
Rope Construction<\/span><\/th>\nFactor<\/span><\/th>\n<\/tr>\n<\/thead>\n
6 x 7 or 7 x 7 Aircraft
\n19 x 7 R.R.
\n18 x 7 R.R.
\n6 x 19 S<\/td>\n		.60
\n.70
\n.80<\/td>\n<\/tr>\n
6 x 19 W
\n6 x 21 FW
\n6 x 26 WS
\n6 x 25B FS
\n6 x 27H FS
\n6 x 30G FS
\n6 x 31V FS<\/td>\n		.90<\/td>\n<\/tr>\n
7 x 21 FW
\n6 x 25 FW
\n6 x 31 WS
\n8 x 19S<\/td>\n		1.00<\/td>\n<\/tr>\n
8 x 21 FW<\/td>\n1.10<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>
\n
\n\n\n\n\n\n\n\n
Rope Construction<\/span><\/th>\nFactor<\/span><\/th>\n<\/tr>\n<\/thead>\n
7 x 25 FW
\n6 x 29 FW
\n6 x 36 WS
\n6 x 36 SFW
\n6 x 43 FWS
\n7 x 31 WS<\/td>\n		1.15<\/td>\n<\/tr>\n
8 x 25 FW
\n6 x 41 WS
\n6 x 41 SFW
\n6 x 29 SWS
\n7 x 36 FW<\/td>\n		1.25<\/td>\n<\/tr>\n
6 x 46 SFW
\n6 x 46 WS
\n8 x 36 WS
\n6 x 61 FWS
\n6 x 57 SFWS<\/td>\n		1.35<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div><\/div>
<\/div><\/div><\/div><\/div>

*Note: This table, with some modifications, is based on outer wire diameter relationships.<\/p>\n<\/div><\/div><\/div>

SERVICE LIFE CURVE FOR VARIOUS D\/d RATIOS<\/h3>\n<\/div>
<\/span><\/div>
<\/div>

This service life curve only takes into account bending and tensile stresses. Its applicability can be illustrated by the following example: A rope working with a D\/d ration of 26 has a relative service life of 17. If the same rope works over a sheave that increases its D\/d ratio to 35, the relative service life increases to 32. In short, this rope used on a larger sheave, increases its service life from 17 to 32 or 88%.<\/p>\n<\/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":[57],"tags":[],"class_list":["post-311","post","type-post","status-publish","format-standard","hentry","category-c34-wire-rope"],"_links":{"self":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/311","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=311"}],"version-history":[{"count":18,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/311\/revisions"}],"predecessor-version":[{"id":10025,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/posts\/311\/revisions\/10025"}],"wp:attachment":[{"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/media?parent=311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/categories?post=311"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wirerope.net\/azwr\/wp-json\/wp\/v2\/tags?post=311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}