{"id":603,"date":"2018-10-17T00:14:55","date_gmt":"2018-10-16T16:14:55","guid":{"rendered":"https:\/\/plasticmoldco.com\/?p=603"},"modified":"2018-10-17T00:14:55","modified_gmt":"2018-10-16T16:14:55","slug":"chapter-25-1-residual-stress","status":"publish","type":"post","link":"https:\/\/www.plasticmoldco.com\/fr\/2018\/10\/17\/chapitre-25-1-contraintes-residuelles\/","title":{"rendered":"Chapitre 25-1, Contraintes r\u00e9siduelles"},"content":{"rendered":"<h1>Un coupable dans les probl\u00e8mes de r\u00e9tr\u00e9cissement et de gauchissement<\/h1>\n<p>La contrainte r\u00e9siduelle est une contrainte induite par le processus, fig\u00e9e dans une pi\u00e8ce moul\u00e9e. Elle peut \u00eatre induite par l'\u00e9coulement ou par la chaleur. Les contraintes r\u00e9siduelles affectent une pi\u00e8ce de la m\u00eame mani\u00e8re que les contraintes externes. Si elles sont suffisamment fortes pour d\u00e9passer l'int\u00e9grit\u00e9 structurelle de la pi\u00e8ce, celle-ci se d\u00e9formera lors de l'\u00e9jection ou se fissurera plus tard, lorsqu'une charge de service externe sera appliqu\u00e9e. Les contraintes r\u00e9siduelles sont la principale cause du retrait et du gauchissement des pi\u00e8ces. Les conditions du proc\u00e9d\u00e9 et les \u00e9l\u00e9ments de conception qui r\u00e9duisent les contraintes de cisaillement pendant le remplissage de la cavit\u00e9 contribueront \u00e0 r\u00e9duire les contraintes r\u00e9siduelles induites par l'\u00e9coulement. De m\u00eame, ceux qui favorisent un tassement suffisant et un refroidissement uniforme du moule r\u00e9duiront les contraintes r\u00e9siduelles d'origine thermique. Pour les mat\u00e9riaux remplis de fibres, les conditions du processus qui favorisent des propri\u00e9t\u00e9s m\u00e9caniques uniformes r\u00e9duiront les contraintes r\u00e9siduelles induites par la chaleur.\u00a0<a title=\"Fournisseur de moules en Chine\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Fournisseur de moules en Chine<\/a><\/p>\n<h1>Contrainte r\u00e9siduelle induite par l'\u00e9coulement<\/h1>\n<p>Les mol\u00e9cules de polym\u00e8re \u00e0 longue cha\u00eene non sollicit\u00e9es ont tendance \u00e0 se conformer \u00e0 un \u00e9tat d'\u00e9quilibre en spirale al\u00e9atoire \u00e0 des temp\u00e9ratures sup\u00e9rieures \u00e0 la temp\u00e9rature de fusion (c'est-\u00e0-dire \u00e0 l'\u00e9tat fondu). Au cours de la transformation, les mol\u00e9cules s'orientent dans le sens de l'\u00e9coulement, le polym\u00e8re \u00e9tant cisaill\u00e9 et allong\u00e9. Si la solidification a lieu avant que les mol\u00e9cules de polym\u00e8re ne soient compl\u00e8tement d\u00e9tendues pour atteindre leur \u00e9tat d'\u00e9quilibre, l'orientation mol\u00e9culaire est bloqu\u00e9e \u00e0 l'int\u00e9rieur de l'enveloppe du polym\u00e8re.<br \/>\npi\u00e8ce moul\u00e9e. Ce type d'\u00e9tat de contrainte fig\u00e9 est souvent appel\u00e9 contrainte r\u00e9siduelle induite par l'\u00e9coulement. En raison de l'orientation mol\u00e9culaire \u00e9tir\u00e9e dans le sens de l'\u00e9coulement, il introduit un retrait et des propri\u00e9t\u00e9s m\u00e9caniques anisotropes et non uniformes dans les directions parall\u00e8les et perpendiculaires au sens de l'\u00e9coulement.<\/p>\n<h2>Orientation mol\u00e9culaire fig\u00e9e<\/h2>\n<p>En raison de la combinaison d'une contrainte de cisaillement \u00e9lev\u00e9e et d'une vitesse de refroidissement \u00e9lev\u00e9e \u00e0 proximit\u00e9 de la paroi du moule, une couche hautement orient\u00e9e est gel\u00e9e imm\u00e9diatement sous la surface de la pi\u00e8ce. Ce ph\u00e9nom\u00e8ne est illustr\u00e9 \u00e0 la figure 1. L'exposition ult\u00e9rieure d'une pi\u00e8ce pr\u00e9sentant des contraintes d'\u00e9coulement r\u00e9siduelles \u00e9lev\u00e9es (ou une orientation fig\u00e9e) \u00e0 une temp\u00e9rature \u00e9lev\u00e9e peut permettre \u00e0 certaines de ces contraintes de se rel\u00e2cher. Il en r\u00e9sulte g\u00e9n\u00e9ralement un retrait et un gauchissement de la pi\u00e8ce. En raison de l'effet d'isolation thermique des couches gel\u00e9es, le polym\u00e8re fondu dans le noyau chaud peut se d\u00e9tendre davantage, ce qui conduit \u00e0 une zone \u00e0 faible orientation mol\u00e9culaire.\u00a0<a title=\"Fournisseur de moules en Chine\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Fournisseur de moules en Chine<\/a><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1303\" title=\"Gel\u00e9 dans l&#039;orientation mol\u00e9culaire\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Frozen-in-molecular-orienta.gif\" alt=\"Gel\u00e9 dans l&#039;orientation mol\u00e9culaire\" width=\"579\" height=\"258\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><strong>FIGURE 1.<\/strong>\u00a0Le d\u00e9veloppement de contraintes d'\u00e9coulement r\u00e9siduelles dues \u00e0 l'orientation mol\u00e9culaire fig\u00e9e pendant les \u00e9tapes de remplissage et d'emballage.<br \/>\n(1) Zone de refroidissement, de cisaillement et d'orientation \u00e9lev\u00e9s (2) Zone de refroidissement, de cisaillement et d'orientation faibles<\/p>\n<h2>R\u00e9duction des contraintes r\u00e9siduelles induites par l'\u00e9coulement<\/h2>\n<p>Les conditions du proc\u00e9d\u00e9 qui r\u00e9duisent la contrainte de cisaillement dans la mati\u00e8re fondue r\u00e9duisent le niveau des contraintes r\u00e9siduelles induites par l'\u00e9coulement. En g\u00e9n\u00e9ral, les contraintes r\u00e9siduelles induites par l'\u00e9coulement sont inf\u00e9rieures d'un ordre de grandeur aux contraintes r\u00e9siduelles induites par la chaleur.\u00a0<a title=\"Fournisseur de moules en Chine\" href=\"https:\/\/web.archive.org\/web\/20130131102842\/http:\/\/www.moldchina.org\/\" target=\"_blank\" rel=\"noopener\">Fournisseur de moules en Chine<\/a><\/p>\n<ul>\n<li>temp\u00e9rature de fusion plus \u00e9lev\u00e9e<\/li>\n<li>temp\u00e9rature plus \u00e9lev\u00e9e de la paroi du moule<\/li>\n<li>temps de remplissage plus long (vitesse de fusion plus faible)<\/li>\n<li>diminution de la pression de garnissage<\/li>\n<li>un chemin d'\u00e9coulement plus court.<\/li>\n<\/ul>\n<h1>\u00a0Contrainte r\u00e9siduelle induite par la chaleur<\/h1>\n<p>Les contraintes r\u00e9siduelles induites par la chaleur se produisent pour les raisons suivantes :<\/p>\n<ul>\n<li>Le mat\u00e9riau se r\u00e9tracte \u00e0 mesure que la temp\u00e9rature baisse entre les param\u00e8tres du processus et les conditions ambiantes atteintes \u00e0 la fin du processus.<\/li>\n<li>Les \u00e9l\u00e9ments mat\u00e9riels subissent diff\u00e9rentes histoires thermo-m\u00e9caniques (par exemple, diff\u00e9rentes vitesses de refroidissement et pressions de tassement) au fur et \u00e0 mesure que le mat\u00e9riau se solidifie de la paroi du moule vers le centre.<\/li>\n<li>Les variations de pression, de temp\u00e9rature et d'orientation des mol\u00e9cules et des fibres entra\u00eenent une variation de la densit\u00e9 et des propri\u00e9t\u00e9s m\u00e9caniques.<\/li>\n<li>Certaines contraintes du moule emp\u00eachent la pi\u00e8ce moul\u00e9e de se r\u00e9tracter dans les directions planes.<\/li>\n<\/ul>\n<h2>Exemple de trempe libre<\/h2>\n<p>Le retrait du mat\u00e9riau pendant le moulage par injection peut \u00eatre d\u00e9montr\u00e9 de mani\u00e8re pratique \u00e0 l'aide d'un exemple de trempe libre, dans lequel une pi\u00e8ce \u00e0 temp\u00e9rature uniforme est soudainement prise en sandwich par les parois froides du moule. Au cours des premi\u00e8res phases de refroidissement, lorsque les couches superficielles externes se refroidissent et commencent \u00e0 se r\u00e9tracter, la plus grande partie du polym\u00e8re au c\u0153ur chaud est encore en fusion et libre de se contracter. Cependant, \u00e0 mesure que le noyau interne se refroidit, la contraction thermique locale est limit\u00e9e par les couches externes d\u00e9j\u00e0 rigides. Il en r\u00e9sulte un \u00e9tat typique de distribution des contraintes, avec une tension dans le noyau \u00e9quilibr\u00e9e par une compression dans les couches externes, comme l'illustre la figure 2 ci-dessous.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1304\" title=\"Exemple de d\u00e9senchantement gratuit\" src=\"https:\/\/web.archive.org\/web\/20130131102842im_\/http:\/\/www.moldchina.org\/wp-content\/uploads\/2011\/10\/Free-quenching-example.gif\" alt=\"Exemple de d\u00e9senchantement gratuit\" width=\"579\" height=\"258\" \/><\/p>\n<p><strong>FIGURE 2.<\/strong>\u00a0Le d\u00e9veloppement de contraintes thermiques r\u00e9siduelles dans une pi\u00e8ce \"\u00e0 trempe libre\" en raison des variations de refroidissement dans la pi\u00e8ce moul\u00e9e et de la r\u00e9ponse du mat\u00e9riau \u00e0 l'\u00e9volution de la temp\u00e9rature.<\/p>","protected":false},"excerpt":{"rendered":"<p>A culprit in shrinkage and warpage problems Residual stress is a process-induced stress, frozen in a molded part. It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. If they are strong enough to overcome the structural integrity of the part, the part will warp upon ejection, or later [&hellip;]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[15],"tags":[],"class_list":["post-603","post","type-post","status-publish","format-standard","hentry","category-mould-technology-blog-1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Chapter 25-1, Residual stress - Plastic Mold | China Mold Maker<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.plasticmoldco.com\/fr\/2018\/10\/17\/kapitel-25-1-restspanning\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Chapter 25-1, Residual stress - Plastic Mold | China Mold Maker\" \/>\n<meta property=\"og:description\" content=\"A culprit in shrinkage and warpage problems Residual stress is a process-induced stress, frozen in a molded part. It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. 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It can be either\u00a0flow-induced or thermal-induced. Residual stresses affect a part similarly to externally applied stresses. 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