{"id":63411,"date":"2022-06-17T15:07:51","date_gmt":"2022-06-17T20:07:51","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/what-is-the-distance-a-bimorph-can-be-extended-before-it-breaks\/"},"modified":"2025-01-27T06:17:30","modified_gmt":"2025-01-27T11:17:30","slug":"what-is-the-distance-a-bimorph-can-be-extended-before-it-breaks","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/what-is-the-distance-a-bimorph-can-be-extended-before-it-breaks\/","title":{"rendered":"Maxim\u00e1ln\u00ed prodlou\u017een\u00ed bimorfu p\u0159ed destrukc\u00ed"},"content":{"rendered":"<p>Bimorfy jsou fascinuj\u00edc\u00edmi komponenty, kter\u00e9 nach\u00e1zej\u00ed uplatn\u011bn\u00ed v \u0161irok\u00e9 \u0161k\u00e1le aplikac\u00ed, od mikrorobotick\u00fdch syst\u00e9m\u016f a\u017e po senzory.  Jednou z kl\u00ed\u010dov\u00fdch vlastnost\u00ed, kter\u00e1 limituje jejich pou\u017eit\u00ed, je maxim\u00e1ln\u00ed vzd\u00e1lenost, o kterou se daj\u00ed prohnout, ne\u017e dojde k jejich poru\u0161en\u00ed.  Tato mez z\u00e1vis\u00ed na cel\u00e9 \u0159ad\u011b faktor\u016f, kter\u00e9 podrobn\u011b rozebereme v n\u00e1sleduj\u00edc\u00edm textu.<\/p>\n<h3>Materi\u00e1l a geometrick\u00e9 parametry<\/h3>\n<p>Hlavn\u00edm faktorem ovliv\u0148uj\u00edc\u00edm maxim\u00e1ln\u00ed prohnut\u00ed bimorfu je materi\u00e1l, ze kter\u00e9ho je vyroben.  R\u016fzn\u00e9 materi\u00e1ly maj\u00ed r\u016fzn\u00e9 pevnosti v tahu a tlaku.  K\u0159ehk\u00e9 materi\u00e1ly, jako je nap\u0159\u00edklad k\u0159em\u00edk, se zlom\u00ed p\u0159i men\u0161\u00edm prohnut\u00ed ne\u017e pru\u017en\u011bj\u0161\u00ed materi\u00e1ly, jako jsou n\u011bkter\u00e9 speci\u00e1ln\u00ed polymery.  D\u00e1le je kl\u00ed\u010dov\u00e1 tlou\u0161\u0165ka jednotliv\u00fdch vrstev bimorfu, jejich \u0161\u00ed\u0159ka a celkov\u00e1 d\u00e9lka. Ten\u010d\u00ed bimorfy se prohnou v\u00edce ne\u017e siln\u011bj\u0161\u00ed, ale jsou tak\u00e9 n\u00e1chyln\u011bj\u0161\u00ed k zlomen\u00ed.  Geometrie bimorfu, konkr\u00e9tn\u011b tvar a proporce jednotliv\u00fdch vrstev, hraje z\u00e1sadn\u00ed roli v jeho mechanick\u00e9 odolnosti a flexibiln\u00ed chov\u00e1n\u00ed.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Materi\u00e1l<\/th>\n<th>Tlou\u0161\u0165ka vrstvy (\u00b5m)<\/th>\n<th>Maxim\u00e1ln\u00ed prohnut\u00ed (mm)<\/th>\n<th>Pevnost v tahu (MPa)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>K\u0159em\u00edk<\/td>\n<td>100<\/td>\n<td>0.5<\/td>\n<td>700<\/td>\n<\/tr>\n<tr>\n<td>PZT keramika<\/td>\n<td>50<\/td>\n<td>1.5<\/td>\n<td>60<\/td>\n<\/tr>\n<tr>\n<td>Speci\u00e1ln\u00ed polymer<\/td>\n<td>200<\/td>\n<td>3.0<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Aplikovan\u00e9 nap\u011bt\u00ed<\/h3>\n<p>Nap\u011bt\u00ed aplikovan\u00e9 na bimorf p\u0159\u00edmo souvis\u00ed s jeho prohnut\u00edm.  Vy\u0161\u0161\u00ed nap\u011bt\u00ed vede k v\u011bt\u0161\u00edmu prohnut\u00ed, ale tak\u00e9 zvy\u0161uje riziko zlomen\u00ed.  Kritick\u00e9 nap\u011bt\u00ed, p\u0159i kter\u00e9m dojde k poru\u0161en\u00ed materi\u00e1lu, se li\u0161\u00ed v z\u00e1vislosti na materi\u00e1lu a geometrii bimorfu.  Je d\u016fle\u017eit\u00e9 pe\u010dliv\u011b navrhnout obvod a \u0159\u00edd\u00edc\u00ed syst\u00e9m, aby se zabr\u00e1nilo p\u0159ekro\u010den\u00ed kritick\u00e9ho nap\u011bt\u00ed.<\/p>\n<h3>Teplotn\u00ed vlivy<\/h3>\n<p>Teplota m\u016f\u017ee v\u00fdznamn\u011b ovlivnit mechanick\u00e9 vlastnosti materi\u00e1lu bimorfu.  N\u011bkter\u00e9 materi\u00e1ly se p\u0159i zah\u0159\u00e1t\u00ed roztahuj\u00ed, jin\u00e9 se smr\u0161\u0165uj\u00ed.  Tyto zm\u011bny rozm\u011br\u016f mohou v\u00e9st k vnit\u0159n\u00edm nap\u011bt\u00edm, kter\u00e9 mohou p\u0159isp\u011bt k poru\u0161en\u00ed bimorfu.  Proto je d\u016fle\u017eit\u00e9 zv\u00e1\u017eit teplotn\u00ed stabilitu materi\u00e1lu p\u0159i n\u00e1vrhu aplikace.<\/p>\n<h3>Vady materi\u00e1lu a v\u00fdrobn\u00ed proces<\/h3>\n<p>P\u0159\u00edtomnost vad v materi\u00e1lu, jako jsou mikrotrhliny nebo ne\u010distoty, m\u016f\u017ee v\u00fdrazn\u011b sn\u00ed\u017eit pevnost bimorfu a jeho odolnost v\u016f\u010di prohnut\u00ed.  Tak\u00e9 kvalita v\u00fdrobn\u00edho procesu hraje z\u00e1sadn\u00ed roli.  Nedokonal\u00e9 spojen\u00ed vrstev nebo nespr\u00e1vn\u00e9 zpracov\u00e1n\u00ed materi\u00e1lu m\u016f\u017ee v\u00e9st k p\u0159ed\u010dasn\u00e9mu poru\u0161en\u00ed bimorfu.<\/p>\n<h3>Praktick\u00e9 ur\u010den\u00ed meze prohnut\u00ed<\/h3>\n<p>Praktick\u00e9 stanoven\u00ed maxim\u00e1ln\u00edho prohnut\u00ed, kter\u00e9 bimorf vydr\u017e\u00ed p\u0159ed zlomen\u00edm, se nejl\u00e9pe prov\u00e1d\u00ed experiment\u00e1ln\u011b.  V\u00fdsledky experiment\u016f je nutn\u00e9 br\u00e1t s rezervou a zohlednit rozptyl dan\u00fd individu\u00e1ln\u00edmi variacemi materi\u00e1l\u016f a v\u00fdrobn\u00edho procesu.  Simulace pomoc\u00ed metod kone\u010dn\u00fdch prvk\u016f (MKP) mohou poskytnout u\u017eite\u010dn\u00e9 informace, ale je pot\u0159eba je validovat experiment\u00e1ln\u011b.<\/p>\n<p>Z\u00e1v\u011brem lze \u0159\u00edci, \u017ee maxim\u00e1ln\u00ed prohnut\u00ed bimorfu p\u0159ed zlomen\u00edm je komplexn\u00ed parametr, kter\u00fd z\u00e1vis\u00ed na cel\u00e9 \u0159ad\u011b faktor\u016f.  Pe\u010dliv\u00fd v\u00fdb\u011br materi\u00e1lu, optimalizace geometrie a precizn\u00ed \u0159\u00edzen\u00ed aplikovan\u00e9ho nap\u011bt\u00ed jsou kl\u00ed\u010dov\u00e9 pro dosa\u017een\u00ed po\u017eadovan\u00e9 \u017eivotnosti a spolehlivosti bimorfu v dan\u00e9 aplikaci.  Experiment\u00e1ln\u00ed ov\u011b\u0159en\u00ed a simulace jsou nezbytn\u00e9 pro p\u0159esn\u00e9 stanoven\u00ed t\u00e9to meze.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bimorfy jsou fascinuj\u00edc\u00edmi komponenty, kter\u00e9 nach\u00e1zej\u00ed uplatn\u011bn\u00ed v \u0161irok\u00e9 \u0161k\u00e1le aplikac\u00ed, od mikrorobotick\u00fdch syst\u00e9m\u016f a\u017e po senzory. Jednou z kl\u00ed\u010dov\u00fdch vlastnost\u00ed, kter\u00e1 limituje jejich pou\u017eit\u00ed, je maxim\u00e1ln\u00ed vzd\u00e1lenost, o kterou se daj\u00ed prohnout, ne\u017e dojde k jejich poru\u0161en\u00ed. Tato mez z\u00e1vis\u00ed na cel\u00e9 \u0159ad\u011b faktor\u016f, kter\u00e9 podrobn\u011b rozebereme v n\u00e1sleduj\u00edc\u00edm textu. Materi\u00e1l a geometrick\u00e9 parametry<\/p>\n","protected":false},"author":1,"featured_media":4862,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-63411","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63411","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/comments?post=63411"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/63411\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/4862"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=63411"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=63411"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=63411"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}