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1、接触笔记1、Definingcontact airs n BAQUS/StanaAft he selecton ocontactparsurfaces,three ke ftorsmust be detemind whn catinga cotacrmulatio: hcntat dicretiztion;he trackig aroac; adthe signmt of “mae” a “lve” roes to the rspecive surface.1.1 the ontctdisetiztionABQU/Stadard offs tw contat discretization op
2、tins： aditionl“de-tosurface” dscretizaionan a tru“surfa-to-urfc” icretiation.1. Nodeto-urface ontct dscetizatoTadioal odetosrfce scretizatiohsthe following harcteristics:Tslaveodes e constrednot to enetate into the master surfae; hoever， thenods otater surace can,in pincpe, penetrae into the slave s
3、urfa e contact dectn s basedothe orma f the stersrfe. he only nformatin edd fo the sae surfcit locatioandsurfce ea assocaed it ech node； The dretion of theav suface normaadslv surae urvaureare not relevant.Ths, he slave sfcecan be defineds group f ode nod-asd srce d-turace dcrtiaton isavilal ven i a
4、 ne-ed surac is not usein te onat pair dionFig1 Ne-osuraccontact disrtiatio112uface-to-surae conct dsctzatioTooptze stresacrcy，ufe-to-srface diseiationcnides the shpeof both t slave and master ufces int regon of cntac costraits.Suaceto-surfae dscrization has t fllowngkeyaracterisi： Cott condtonsae e
5、nore n ava sene ver th slave suface,rather tan tscrt ints (such a atlavenodes,as in ecse of d-o-suface dicretition）. erefore, sm penetratinbebsee iiviualodes;howvr,lage， undetected penetrtions o mtenode into th ve urface o no ocur with this dsceizationrface-t-ure disretiztion is ot appliable ifa de-
6、bsed surface is ued inthe contapai finitio在某一种迭代步中，面对面的接触计算成本一般较点对面的接触的计算成本高，但多数状况下这个成本不会高诸多,只有在下列状况下才会让计算成本急剧增大：模型的绝大部分区域被涉及于接触中;当积极面比附属面网格划分还要精细时; ultiple las of hel e inlve n otac, uh tha he maste suraceofon cotactair ctas the slve rfaeo another contact ar.尽管如此,但点对面的接触需要耗费更多的迭代步才干达到数值稳定,从某种意义上来说，
7、在一种分析步中,无法鉴定究竟是用点对面接触还是面对面接触计算成本低1.2 Contact trckig ppracheI ABAQSndad threaretw tackigaproches toaccnt fo he relae mion te twosurfaceforinga conact pai nmechal cntaimultons: Tinie-sliig tracing proach The small-sliding rackn approac1.3 ndamntal choics affctingth contct fomultioYour hoiceof contactd
8、isretitio and tacingapoahave consderble imat on an alysis. In dditioto he qulies aleady discussed,certainobinaton of dsctition d acking aproaches hav theirown charcteritics anlimiaions asociae wth the. Thse caracteritics are smmarized al . Yshou also consir h soluton ctsssatd wth h vaioucontact form
9、ationsTle1Comparison of contact oulatin araristic1. 选择积极面和附属面的几种原则Analytc rid suraes andrigdeee-based suraces must always theer srfcAodebasd surfe cn act onl as a slave suce a alwys ues noe-trfae coc.Slave srfaes mut alay e attached to efoable odis or deforble odies defined igid. t surfes i aconctpi
10、rcanot rigid sfaces ith h excptonof defomabl surface eined srigid一般来说,当定义两个基于单元的面作为解除对作用面时，当存在一种较小的面和一种较大的面时，一般将较小的面定义为附属面。当两个面大小接近时，选用较“硬”的面或单元划分笔记粗糙的面作为积极面。值得注意的是,“硬”的面不一定是材料弹性模量大的材料,例如当一种薄金属片和一种橡胶材料接触时，此时就应当将薄金属片所属的面定义为附属面。当两个面区域接近，“硬度”也接近时,此时往往需要反复尝试才干得到较好的成果。与点对面接触相比,面对面接触中积极面和附属面的选用,对计算成果的影响并不
11、是很大。但是，当错误的将网格粗糙的面定义为附属面时,此时也许会引起计算成本的急剧增长。1.5定义接触对为了定义一种接触对,必须指定一对接触面或者一种自接触的面，一种ontat formulation。每一种接触对可以定义不同的作用面性质。15.1Dfiningcntactetwen two sparate surfesen aact airconains tw faes， te aser and se suace re t loed toinclue an of the smenodes and yu mt hoos whih surfae ill e th s andwhich will e
12、 the maer.AAQUS/tdard定义接触默认采用的是有限滑移、点对面接触。如果定义的是小滑移，默认的也吃采用点对面接触。1.5. 用对称的主从接触对提高接触模拟精度对于点对面接触，积极面上的节点很容易pnetrate到附属面上去,此时，提高附属面上单元的网格划分精度，有助于减少这样的刺入，提高运营速度。才外,让两个面都是基于单元定义时，可以用symmetrc mas-slae eho。To use ts method, eiewo contctpsusing thesam to rces, but witche oeso mater adsave urfceorthe wocotc pirsThis medcause ABAQU/Stndard to reat h urace as a mastersurface and, thus, nvlvs adtiol oputationl exnse beause contactseache musbecdcetwiceforthe e cotctpar. Teinra acu proided bythimthod must e cmparedto the ddiona omputaional ostAlof
