Mechanika kontaktu w charakteryzowaniu materiałów inżynierskich

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$('#header-navbar .navbar-collapse').css('max-height', windowHeightMobile - menuHeightMobile); }; }); $(window).scroll(function(){ menuFix(); }); $(window).resize(function(){ menuFix(); }); }); //]]> </script> </header> <div id="two-column-layout"> <div class="container"> <ol class="breadcrumb hidden-xs" itemscope itemtype="https://schema.org/BreadcrumbList"> <li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"> <a itemprop="item" href="https://www.ksiegarniatechniczna.com.pl/"><span itemprop="name">Start</span></a> <meta itemprop="position" content="1" /> </li> <li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"> <a itemprop="item" href="https://www.ksiegarniatechniczna.com.pl/category/mechanika"><span itemprop="name">Mechanika</span></a> <meta itemprop="position" content="2" /> </li> <li itemprop="itemListElement" itemscope itemtype="https://schema.org/ListItem"> <a itemprop="item" href="https://www.ksiegarniatechniczna.com.pl/mechanika-kontaktu-w-charakteryzowaniu-materialow-inzynierskich.html"><span itemprop="name">Mechanika kontaktu w charakteryzowaniu materiałów inżynierskich</span></a> <meta itemprop="position" content="3" /> </li> </ol> <script type="text/javascript"> //<![CDATA[ jQuery(function($) { $(document).ready(function(){ const breadcrumbsEl = document.querySelectorAll('.breadcrumb'); 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var url = ''; var parameters = []; if (event.type == 'submit') { var form = $(this); url = form.attr('action'); if (!quantity_selector) { quantity_selector = '#' + form.attr('id') + '_quantity'; } parameters = form.serializeArray(); } else if (event.type == 'click') { var link = $(this); if (link.hasClass('basket_disabled')) { event.stopImmediatePropagation(); return false; } url = link.attr('href'); if (!quantity_selector) { quantity_selector = '#' + link.attr('id') + '_quantity'; } } var quantity = $(quantity_selector); if (quantity.length && quantity.val() == 0) { quantity.val(quantity.get(0).defaultValue); } if (quantity.length) { parameters.push({ name: "quantity", value: quantity.val() }); } if (window.location.protocol != 'https:') { url = url.replace('https://', 'http://'); } var body = $('body').css({ cursor: 'wait' }); var div = $('<div></div>'); div.css({ 'height': body.height(), 'width': body.width(), position: 'absolute', 'z-index': 10000, background: 'transparent', cursor: 'wait' }); body.prepend(div); $.post(url, parameters, function(html) { var html = $(html); $('body').append(html); div.remove(); body.css({ cursor: 'auto' }); }, 'html'); event.preventDefault(); event.stopImmediatePropagation(); }); }); }); //]]> </script> </li> <li style="margin-top: 12px"> </li> </ul> </div> </div> <div class="row"> <div itemprop="description" class="description tinymce_html col-xs-12"> <p><strong>Mechanika kontaktu w charakteryzowaniu materiałów inżynierskich</strong></p> <p>rok wydania: 2023, wydanie pierwsze<br />ISBN: 978-83-7348-896-0<br />ilość stron: 130</p> <p><span style="text-decoration: underline;"><strong>Opis</strong></span></p> <p><strong>W pierwszej części pracy przedstawiono teoretyczne podstawy mechaniki kontaktu</strong>. Omówiono <strong>model kontaktu Hertza</strong> opisujący zależność pomiędzy obciążeniem przyłożonym do kulistego wgłębnika i jego przemieszczeniem. W dalszej części scharakteryzowano <strong>modele niehertzowskie</strong>, w których pod uwagę bierze się siły adhezji. Przedstawiono dwa modele uwzględniające adhezyjne przyciąganie sferycznego wgłębnika i podłoża, tj. <strong>model Johnsona, Kendalla i Robertsa</strong> (JKR), wykorzystujący równowagę pomiędzy zmagazynowaną energią sprężystą a utratą energii powierzchniowej pomiędzy kulistym wgłębnikiem i powierzchnią płaską, oraz <strong>model sprężystego kontaktu Derjaguina–Mullera–Toporowa</strong> (DMT). Model JKR uwzględnia wpływ nacisku kontaktowego i adhezji tylko wewnątrz obszaru kontaktu, natomiast model DMT uwzględnia dodatkowo siły przyciągania występujące pomiędzy ciałami, które oddziałują także poza strefą kontaktu. W dalszej części monografii zaprezentowano <strong>modele dla płaskich powierzchni biorące pod uwagę ich chropowatość</strong>. Opisano <strong>teorię Greenwooda i Williamsona</strong> (GW), która zakłada, że wysokości nierówności mają rozkład gaussowski, a odkształcenie nierówności jest opisane modelem Hertza, oraz teorie Greenwooda i Trippa. Następnie przedstawiono <strong>matematyczny opis odkształcania materiału przy jego kontakcie z wgłębnikiem w kształcie stożka</strong>, zaprezentowany przez Sneddona. W kolejnym rozdziale <strong>omówiono różne metody pomiaru twardości materiałów: Brinella, Meyera, Vickersa, Knoopa, Martensa i Rockwella</strong>. Następny rozdział opisuje <strong>metodę indentacji</strong>. Scharakteryzowano w nim naprężenia i odkształcenia w materiale podczas penetracji przez kulisty i ostry wgłębnik, sposoby określania twardości i sztywności materiału, opisano efekt skali występujący dla małych przemieszczeń wgłębnika, a także sposób wyznaczania gęstości dyslokacji występujących w materiale i ich mobilności. Rozdział ten zawiera też omówienie sposobu <strong>wyznaczania współczynnika umocnienia odkształceniowego, krytycznego współczynnika intensywności naprężeń oraz naprężeń własnych przy wykorzystaniu testu indentacji</strong>. Znajdują się tu również informacje na temat <strong>testu zarysowania</strong>. Ostatni rozdział przedstawia <strong>wyniki prac naukowych</strong>, których autorka jest współautorem, i wyniki badań własnych jeszcze nieopublikowanych, które zostały uzyskane za pomocą indentera.</p> <p><span style="text-decoration: underline;"><strong>Spis treści</strong></span></p> <p>Spis ważniejszych oznaczeń / 5</p> <p><strong>1. Wstęp</strong> / 9</p> <p><strong>2. Cel pracy</strong> / 11</p> <p><strong>3. Teoretyczne podstawy mechaniki kontaktu</strong> / 12<br />3.1. Model Hertza dla systemu kulistego wgłębnika dociskanego do płaskiej próbki / 12<br />3.2. Modele uwzględniające siły adhezji pomiędzy kulą i podłożem / 16<br />3.3. Modele dla płaskich powierzchni uwzględniające ich chropowatość / 22<br />3.4. Wgłębnik stożkowy i inne wgłębniki posiadające kąt wierzchołkowy / 26</p> <p><strong>4. Pomiary twardości</strong> / 32<br />4.1. Twardość Meyera / 32<br />4.2. Twardość Brinella / 33<br />4.3. Twardość Martensa 35<br />4.4. Twardość Vickersa / 36<br />4.5. Twardość Knoopa / 38<br />4.6. Twardość Rockwella / 39</p> <p><strong>5. Test indentacji</strong> / 41<br />5.1. Naprężenia i odkształcenia w materiale podczas testu indentacji / 45<br />5.2. Efekt pile up / 50<br />5.3. Wyznaczanie twardości i sztywności w materiału / 52<br />5.4. Efekt skali i wyznaczanie gęstości dyslokacji / 59<br />5.5. Pełzanie materiału i wyznaczanie mobilności dyslokacji / 62<br />5.6. Wyznaczanie współczynnika umocnienia odkształceniowego materiału / 66<br />5.7. Wyznaczanie naprężeń własnych / 68<br />5.8. Wyznaczanie krytycznego współczynnika intensywności naprężeń / 72<br />5.9. Dynamiczny test indentacji / 78<br />5.10. Test zarysowania / 83</p> <p><strong>6. Przykłady badań własnych w charakterystyce materiałów inżynierskich</strong> / 87<br />6.1. Właściwości mechaniczne bakteryjnej nanocelulozy / 87<br />6.2. Charakteryzowanie szlifowanej warstwy wierzchniej stali C45 / 94<br />6.3. Wyznaczanie naprężeń własnych w laserowo obrabianych cięgnach podwozia samolotu / 100<br />6.4. Charakteryzowanie warstw <span style="white-space: nowrap;">Al<span style="display: inline-block; margin-bottom: -0.3em; vertical-align: -0.3em; line-height: 1.0em; font-size: 80%; text-align: left;"><br />2</span>O<span style="display: inline-block; margin-bottom: -0.3em; vertical-align: -0.3em; line-height: 1.0em; font-size: 80%; text-align: left;"><br />3</span></span> wytwarzanych metodą micro-arc oxidation (MAO) pod kątem ich odporności na obciążenia kawitacyjne / 105<br />6.5. Charakteryzowanie kompozytowych powłok typu nanościanki węglowe–polidopamina–polizwitterion / 112</p> <p><strong>7. Podsumowanie</strong> / 117</p> <p>Bibliografia / 119<br />Streszczenie w języku polskim / 128<br />Streszczenie w języku angielskim / 129</p> </div> </div> <ul class="nav nav-tabs"> <li class="active"> <a rel="nofollow">Recenzje</a> </li> </ul> </br> <div id="product-tab-review"> </div> <script type="text/javascript"> //<![CDATA[ jQuery(function($){ $.get('/review/listReviews?id=5290', function(html) { $('#product-tab-review').html(html); }); }); //]]> </script> <div class="card-tabs relative"> <ul id="product-tabs" class="nav nav-tabs"> <li> <a href="#product-tab-1" data-url="/product/recommendProducts/id/5290/id_category/23/id_producer/157" rel="nofollow">Polecane produkty</a> </li> </ul> </div> <div class="tab-content"> <div class="tab-pane" id="product-tab-1"></div> </div> </div> </div> </div> <div class="modal fade" id="execute_time_overlay" tabindex="-1" role="dialog" aria-labelledby="execute_time_overlay" aria-hidden="true"> <div class="modal-dialog"> <div class="modal-content"> </div> </div> </div> <script type="text/javascript"> //<![CDATA[ jQuery(function($) { var preloader = $('#product-preloader'); 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